The present invention relates to the field of methods and apparatuses for assembling complex products and, in particular, a method and apparatus for assembling and testing a motor vehicle automatic transmission clutch in a parallel process system.
In today's manufacturing industry, the customary manner of assembling products is with an assembly line in a serial process system. A serial process system is defined as having the complex product travel through successive, single operations or stations in order to complete the assembly of the complex product. Serial process systems are even more common when such products are complex in nature, thereby requiring the assembly of a variety of different subcomponents and various individual components in various locations on the product.
Typically, the serial process of an assembly line begins with the delivery of a complex product to the assembly line wherein the complex product is then loaded into an assembly line transport system, either automatically or manually. The transport system carries the complex product to a variety of workstations along the assembly line, wherein the various components and subcomponents are assembled into the complex product. For example, in a serial processed engine cylinder head assembly line, spark plugs may be installed into the cylinder head at the first workstation, and after the spark plugs are installed, the transport system may carry the cylinder head to a second workstation, wherein the cylinder head may be rotated so that additional componentry may be assembled on the underside or opposite side of the cylinder head. Cylinder head valves may be installed into the cylinder head at a subsequent workstation, and upon traveling to the next workstation, the cylinder head may be rotated back to its original position. The following workstation may then be responsible for installing valve springs into the cylinder head. The transport system continues to carry the cylinder head from workstation to workstation until the cylinder head is completely assembled. The number of workstations on the assembly line may vary, depending on the type of cylinder head or componentry. Typically, the number of workstations range in the neighborhood of six to eight with the transport system passing through or adjacent to each of the workstations.
The timing of the workstations and the transport system is critical for such assembly lines. In the above-noted example, the complex product moves from one workstation to the next, wherein the transport system may stop to allow for an operation to be performed at each of the workstations. A certain amount of time may even be designated for completing a specific task at a specific workstation.
Although assembly lines have been utilized throughout the history of the manufacturing industry, such assembly lines are plagued with inefficiencies. For instance, assembly lines within the automotive industry are typically dedicated to a particular component of an automobile and for a specific model of an automobile. Thus, such assembly lines cannot be utilized to manufacture any component of an automobile, but rather, they can be only utilized to build certain specific components. Therefore, if the particular component is no longer needed, for instance, the particular model of automobile in which the component is utilized is no longer being manufactured, and then the particular assembly line cannot be utilized without major retooling. Therefore, the assembly line must be retooled or disassembled, and a new assembly line must be installed. This is, of course, a very timely and costly task, and one that is undesirable in an industrial environment.
As previously mentioned, such assembly lines are typically timed to provide each laborer at a particular workstation a specific amount of time under which to complete the operation at that particular workstation. If a problem occurs at that particular workstation such that the task can no longer be performed, for instance, a tool breaks, the transport system shuts down, certain components are defective, etc., then the entire assembly line may have to be shut down until the problem is corrected. When this occurs, manufacturing of the particular product is halted, thereby causing a shortage of the product being manufactured or assembled on that particular assembly line. Such a shortage of products could create shortages in other assembly lines thereby requiring other assembly lines to shut down. Thus, manufacturing facilities often produce a surplus of components so that a sufficient supply of components is provided should the assembly line break down or stop. Such uncertainty in the operation of the assembly line may lead to a shortage or a surplus of components. A shortage of components may lead to other assembly lines being short of parts, and a surplus of components may mean that unnecessary parts have been produced, thereby wasting time and money. Either situation creates an inefficiency that is undesirable in an industrial environment.
Lastly, assembly lines often span across a rather large area of the manufacturing facility in order to provide a sufficient amount of space for the transport system, the work stations, and the laborers. The floor space in a manufacturing facility can be rather expensive, and therefore, it is always desirable to reduce the amount of floor space to produce a particular product.
It would be desirable to provide a method and apparatus for assembling a clutch in a parallel process system that would require a minimum amount of factory floor space.
The present invention relates to a method and apparatus for automatically assembling a clutch of an automatic transmission of a motor vehicle. The apparatus of the present invention provides an assembly station having an assembly table, wherein a clutch fixture is connected to the assembly table and is adaptable to receive a clutch housing. At least one tray is connected to the assembly table and is adaptable to receive clutch components of the clutch. At least one robotic arm is engageable with the clutch housing and the clutch components for loading and unloading the clutch housing onto and from the clutch fixture and the clutch components into and from the at least one tray. A manipulator is connected to and in communication with the at least one robotic arm for automatically engaging an appropriate tool for assembling the clutch components into the clutch housing. At least one assembly fixture is removably connected to the clutch fixture and connectable to the clutch housing for assisting in the assembly of the clutch components to the clutch housing.
The assembly fixture of the apparatus may provide an outer and inner seal sleeve removably connected to the clutch fixture and engageable with the clutch housing for assisting in the assembly of the clutch components of the clutch housing. The assembly fixture of the apparatus may also provide a snap ring mounting device releasably connected to the clutch fixture and engageable with the clutch housing for assisting in the assembly of the clutch components to the clutch housing. The assembly fixture of the apparatus may also provide a plate having a stepped cylindrical structure connected thereto and engageable with the clutch housing. A pair of substantially cylindrical posts may be connected to the plate adjacent the stepped cylindrical structure for receiving the at least one assembly fixture.
The tool engaged by the manipulator of the apparatus may include a vacuum gripper releasably engageable with the clutch components for moving and assembling the clutch components into the clutch housing. The tool of the apparatus may also provide a rotatable press engageable with the clutch components for assembling the clutch components to the clutch housing. In addition, the tool of the apparatus may include at least one spring-loaded plunger engageable with the clutch components for maintaining the clutch components in a predetermined position while assembling the clutch components to the clutch housing. The tool may also provide a snap ring press engageable with the clutch components for assembling the clutch components to the clutch housing.
The apparatus of the present invention may also include a test station engageable with an assembled clutch housing for testing the structural and functional integrity of the assembled clutch housing.
The method of the present invention may include the steps of providing an assembly station having an assembly table, a clutch fixture connected to the assembly table, at least one tray connected to the assembly table, and at least one robotic arm. The steps may further include placing a clutch housing on the clutch fixture and the clutch components in at least one tray with the at least one robotic arm. The method may further include engaging an appropriate tool with the manipulator connected to and in communication with the at least one robotic arm for assembling the clutch components to the clutch housing and removably connecting at least one assembly fixture to the clutch fixture and the clutch housing to assist in the assembly of the clutch components to the clutch housing.
The method of the present invention may also include providing an inner and outer sleeve as the at least one assembly fixture. In addition, the steps may include providing a snap ring mounting device as the at least one assembly fixture. The method may include providing a plate as the plate clutch fixture having a stepped cylindrical structure connected thereto for receiving and securing a clutch housing, wherein a pair of substantially cylindrical posts may be connected to the plate adjacent the stepped cylindrical structure for receiving the at least one assembly fixture.
The method of the present invention may also include providing a vacuum gripper as the tool for releasably engaging the clutch components and moving the clutch components into the clutch housing. The steps may also include providing a rotatable press as the tool for engaging the clutch components and applying pressure to the clutch components and the clutch housing. The method may also include providing at least one spring-loaded plunger as the tool for engaging and maintaining the clutch components in a predetermined position in the clutch housing. The steps may also include providing a snap ring press as the tool for engaging the clutch components and assembling the clutch components to the clutch housing.
Lastly, the method of the present invention may include providing a test station engageable with an assembled clutch housing for testing the structural and functional integrity of the assembled clutch housing.
The description herein makes reference to the accompanying drawings wherein like reference numerals refer to like parts throughout the several views, and wherein:
The clutch 10 includes a substantially cylindrical clutch housing 12. The clutch housing 12 defines an inner radial wall 14, an outer radial wall 16, and a base wall 18. The inner radial wall 14, the outer radial wall 16, and the base wall 18 cooperate to define an internal annular channel 20 of the clutch housing 12. The internal annular channel 20 extends around a central bore 22 of the clutch housing 12, which is defined by the inner radial wall 14 of the clutch housing 12. The central bore 22 has splined gear teeth 23 extending along a longitudinal axis of said central bore 22.
Various components of the clutch 10 are arranged within the internal annular channel 20 of the clutch housing 12. In particular, an outer substantially circular seal 24 is located adjacent to the base wall 18, a substantially circular disc spring 26 is located adjacent to the outer seal 24 opposite the base wall 18, an inner substantially circular seal 28 is disposed adjacent to the disc spring 26 and is secured in place by an inner substantially circular snap ring 30, a substantially circular clutch pack 32 is disposed adjacent to the outer radial wall 16 outward from the outer seal 24, the disc spring 26, and the inner seal 28, and an outer substantially circular snap ring 34 secures the clutch pack 32 in place with respect to the clutch housing 12. Those skilled in the art would be familiar with the conventional design of the clutch 10 of an automatic transmission of a motor vehicle.
Each robotic arm 42 further includes a manipulator 48 that is connectable to various types of tools 64 for performing assembly processes, as will be described herein. The manipulator 48 is moveable along a Z-axis, or elevation axis, using a linear actuator 50 or other suitable structure. While the clutch assembly cell 40 need only include a single robotic arm 42 in order to perform the method described herein, it is specifically contemplated that multiple robotic arms 42 may be provided, thus allowing certain steps of the method to be performed simultaneously, that is, in parallel with one another. In addition, the robotic arm 42 may be self-standing on a rotatable base (not shown) as opposed to the overhead gantry 44.
The clutch assembly cell 40 includes a test station 52 on which testing fixtures 54 are slidably mounted on a pair of substantially parallel rails 55 for movement in a Y-direction. In particular, multiple testing fixtures 54 may be provided on the test station 52 for movement into and out of registration with the robotic arms 42 in the Y-direction, thus allowing testing to be performed on the assembled clutch 10 that is disposed on the test station 52 that is not in registration with the robotic arms 42 while another clutch 10 is being loaded or unloaded with respect to another test station 52 that is in registration with the robotic arms 42 in the Y-direction.
The clutch assembly cell 40 also includes an assembly station 56 on which an assembly table 58 is slidably mounted on a pair of substantially parallel rails 59 for movement into and out of registration with respect to the robotic arms 42. In particular, the assembly table 58 is able to move between at least a first position, wherein the assembly table 58 is disposed in registration with the robotic arms 42 such that the clutch 10 may be loaded, unloaded, or assembled on the assembly table 58, and a second position, wherein the assembly table 58 places the clutch 10 in registration with a press-and-rotate tool 60.
The clutch assembly cell 40 also includes one or more tool tables 62 upon which tools 64 are supported for use by the robotic arms 42. In particular, the tools 64 may be selectively attached to and detached from the manipulator 48 of each robotic arm 42 for performing various assembly operations. Thus, during the assembly process, the robotic arm 42 may use multiple tools 64 by selectively detaching a first tool 64 from the manipulator 48 and placing it on the tool table 62, and subsequently attaching the manipulator 48 of the robotic arm 42 to a second tool 64 that is disposed on the tool table 62.
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The piston loading tool 82 is also utilized to assemble the inner seal 28 with respect to the clutch housing 12 including registration of the vacuum gripper 84 of the piston loading tool 82 with respect to a tab (not shown) in the inner seal 28 with a spring-loaded key 96 of the piston loading tool 82, as shown in
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Subsequent to installation of the outer snap ring 34, the clutch 10 is in a fully assembled condition and may be placed onto one of the testing fixtures 54 of the test station 52 by one of the robotic arms 42 for a leak test and gauging operation. While the leak test is being performed on the completed clutch 10, another clutch 10 may be assembled at the assembly station 56.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiments but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims, which scope is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures as is permitted under the law.
This application claims the benefit of U.S. Provisional Patent Application Ser. No. 61/363,510, which was filed on Jul. 12, 2010.
Number | Date | Country | |
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61363510 | Jul 2010 | US |