Patent Application
20120186056
1. Field of the Invention
The present invention relates to an assembling tool, and in particular to an alignment tool for facilitating the attachment or detachment of a clutch.
2. Description of the Prior Art
A clutch of a motorcycle or an automobile is mounted between an engine and a transmission box, whereby the power output by the engine is transmitted to the transmission box via a crankshaft. The clutch is provided therein with a clutch disc. The clutch disc is gradually worn down by friction generated between a flywheel and a pressure plate in the clutch, so that the clutch disc has to be replaced periodically. Traditionally, the replacement of the clutch disc is carried out by the following steps: (1) detaching the engine from the chassis; (2) detaching the transmission box from the chassis; (3) detaching the clutch cover from the flywheel to thereby remove the clutch disc from the clutch; (4) replacing the clutch disc with a new one; (5) clamping the new clutch disc between a frictional surface of the flywheel and a surface of the pressure plate, putting the clutch cover on the flywheel, and aligning the axial hole of the clutch disc with the center of the flywheel (i.e. the center of the crankshaft); (6) mounting the clutch cover on the flywheel; (7) keeping the axial hole of the clutch consistent with the center of the flywheel, mounting the transmission box into the engine; and (8) mounting the engine to the chassis.
In the above-mentioned step (5), it is not easy to align the axial center of the clutch disc with the center of the flywheel. Thus, a special assembling took is needed. Please refer to
EP191550A2 discloses a conventional assembling tool having an expanding mechanism at its middle section for adjusting the outer diameter of the assembling tool. The expanding mechanism is configured to abut against the shaft hole of the clutch disc. The expanding mechanism is constituted of an operating rod and a conical sleeve. The front end of the operating rod is provided with a claw portion of a larger diameter. A plurality of slots extends from an end edge of the claw portion to the middle section of the other end of the operating rod. The inner edge of the claw portion is formed with an inner conical surface corresponding to the outer edge of the conical sleeve, whereby the rear end of the conical sleeve can be assembled in the claw portion. Further, the front end of this conventional assembling tool is provided with positioning claws capable of generating a radial expansion or retraction for abutting against the shaft hole of the crankshaft. The positioning claws are constituted of three claws combined together with a plastic sheath. The positioning claws are positioned to correspond to the inner edge of the conical sleeve and formed into an inner slope to correspond to its outer conical surface. In assembly, the front end of the conical sleeve is exactly disposed in the positioning claws.
With this structure, when the operating rod is pushed by related component provided at its rear end, the front end and the rear end of the conical sleeve are simultaneously located in the positioning claws and the expanding claws. The provision of the slope allows the positioning claws and the expanding claws to generate a radial expansion, thereby contacting the shaft holes of the crankshaft and the clutch disc. However, such a structure has the following problems:
(I) The operating rod is a rigid body, and only the expanding claws and the front section of the operating rod are provided with slots. If the shaft hole of the clutch disc is large, a greater force is needed for expanding the large-diameter expanding claws. Further, the repeated expansion and retraction of the expanding claws may cause fatigue of the rigid operating rod. Since the expansion of the expanding claws is caused by the forward abutment of the conical sleeve against the positioning claws, such a process may be carried out in a less smooth and steady manner.
(II) The positioning claws are exposed to the outside, so that the plastic sheath is used to combine the positioning claws together. However, the plastic sheath is brought into frictional contact with the components in the clutch for a long period of time, so that the plastic sheath may become worn and broken. Further, the repeated expansion of these claws may cause elastic fatigue in the plastic sheath.
In view of the above, the present inventor proposes a novel and reasonable structure based on his expert experience and delicate researches.
In order to solve the above problems, an objective of the present invention is to provide a universal clutch alignment tool, whereby different kinds of clutch discs can be assembled or disassembled by using one assembling tool. Thus, the efficiency and quality of assembling the clutches is improved greatly.
In order to achieve the above objective, the present invention provides a universal clutch alignment tool, which includes a tool rod, an adjustment nut, a connecting mechanism and a positioning pipe. The adjustment nut, the connecting mechanism and the positioning pipe are assembled at a front end of the tool rod. The tool rod is an elongate rod having an outer threaded section on its front end. The outer threaded section is threadedly combined with one end of an adjustment nut. The other end of the adjustment nut is threadedly combined with the connecting mechanism. The connecting mechanism comprises a sleeve, a driving rod, and a plurality of connecting blocks. The sleeve is made into a hollow pipe in which one end of the driving rod is disposed. The surface of the sleeve is formed with a plurality of slots that are respectively arranged at an angular interval. The connecting blocks are received in the slots respectively. The inner walls of both ends of the sleeve are formed with a first inner threaded portion and a second inner threaded portion respectively. The first inner threaded portion is threadedly combined with the corresponding end of the adjustment nut. The second inner threaded portion is threadedly combined with one end of the screw rod. The other end of the screw rod is threadedly combined with the positioning pipe. The driving rod is driven by one end of the tool rod to move. The driving rod is provided with a driving head of a larger diameter located at one end of the sleeve. At least one outer surface of the driving head is formed with a conical driving slope. The middle section of each driving block is provided with a notch. The inner walls on both sides of the notch are formed with two connecting slopes symmetrical with each other. When the driving head of the driving rod is disposed in the sleeve, the outer edge of the driving head is inserted into the notches of the connecting blocks, so that the driving slopes abut against the connecting slopes. Thus, the driving rod driven by the tool rod can drive the connecting blocks to generate a radial expansion or retraction, thereby allowing various kinds of clutches to be assembled or disassembled. A bushing and an elastic element forms a group. One group is provided between one end of the sleeve and the adjustment nut. The other group is disposed between one end of the sleeve and the inner edge of the positioning pipe. One end of each bushing is inserted into the edges of the connecting blocks, and the other end of the bushing abuts against the elastic element. The other end of the elastic element abuts against the end surfaces of the adjustment nut and the positioning pipe. With this structure, the process of the driving rod of the tool rod for driving the connecting blocks can be carried out more smoothly.
The technique, methods and functions of the present invention will be described in more detail with reference to a preferred embodiment thereof shown in the accompanying drawings. Thus, the above objectives, structure and characteristics of the present invention can be better understood.
Please refer to
The tool rod 10 is an elongate rod. One end of the tool rod 10 is configured to be held by a user, and the other end is provided with an outer threaded section 11 for threadedly combining with the adjustment nut 20.
An inner edge of one end of the adjustment nut 20 corresponding to the tool rod 10 is formed with an inner threaded hole 21 for threadedly combining with the outer threaded section 11. The other end of the adjustment nut 20 is formed with an outer threaded portion 22 for threadedly combining with the connecting mechanism 30.
The connecting mechanism 30 includes a sleeve 31, a driving rod 32, a plurality of connecting blocks 33, a bushing 34 and an elastic element 35.
The sleeve 31 is formed into a hollow pipe for allowing one end of the driving rod 32 to be disposed therein. The middle section of the surface of the sleeve 31 is formed with a plurality of slots 311 respectively arranged at an angular interval for allowing the connecting blocks 33 to be received therein. The inner walls of both ends of the sleeve 31 are formed with a first inner threaded portion 312 and a second inner threaded portion 313 respectively. The outer threaded portion 22 of the adjustment nut 20 is threadedly combined with the first inner threaded portion 312. One end of the screw rod 40 is threadedly combined with the second inner threaded portion 313.
The driving rod 32 is formed into a rod having a protrusion at an end. One end of the driving rod 32 is drivingly connected to the tool rod 10, so that the driving rod 32 can be driven by the tool rod 10 to move. The other end of the driving rod 32 is a driving head 321 of a larger diameter located in the sleeve 31. The outer surfaces of two opposite sides of the driving head 321 are respectively formed into a conical driving slope 322 for drivingly connecting to the connecting blocks 33.
The connecting blocks 33 are disposed in the slots 311 of the sleeve 31. Each of the connecting blocks 33 is formed into an elongate block. The outer edges of both ends of each connecting block 33 are formed into a conical end slope 331 respectively. The middle section of the connecting block 33 is provided with a V-shaped notch 332. The inner walls of both sides of the notch 332 are formed into two connecting slopes 332 symmetrical with each other. When the driving head 321 of the driving rod 32 is disposed in the sleeve 31, the outer surface of the driving head 321 is inserted into the notch 332 of the connecting block 33 with the driving slope 322 abutting against the connecting slope 333. In this way, when the driving rod 32 is driven by the tool rod 10, the connecting blocks 33 are synchronously driven to generate a radial expansion or retraction.
The inner edge of one end of the bushing 34 corresponding to the connecting block 33 is formed with a conical hole 341. The elastic element 35 is a compression spring having an elastic restoring force. A bushing 34 and an elastic element 35 form a group. One group is disposed between the sleeve 31 and the inner edge of the adjustment nut 20. The other group is disposed between the sleeve 31 and the screw rod 40. The conical hole 341 of the bushing 34 abuts against the connecting slopes 333 of the connecting blocks 33. Two ends of the elastic element 35 abut between the end surface of the bushing 34 and the adjustment nut 230 (or the screw rod 40). With this structure, the movement of the connecting blocks 33 driven by the driving rod 32 is more smooth and steady.
The screw rod 40 is a conventional screw rod. Both ends of the screw rod 40 are provided with a first outer threaded end 41 and a second outer threaded end 42 respectively. The first outer threaded end 41 is threadedly combined with the positioning pipe 50. The second outer threaded end 42 is threadedly combined with the second inner threaded portion 313 of the sleeve 31.
The outer diameter of the positioning pipe 50 is equal to the inner diameter of the shaft hole 611 of the crankshaft 61. The positioning pipe 50 is threadedly combined with the first threaded end 41 of the screw rod 40.
With the above constituents, the driving rod 32 of the connecting mechanism 30 drives the connecting block 33 to generate radial expansion or retraction. Further, the bushing 34 together with the elastic element 35 enables the assembling tool to be universally used in assembling or disassembling different kinds of clutches. Also, the present invention has a compact structure to thereby enhance the efficiency and quality of its operation.
Please refer to
According to the above, the present invention really demonstrates novelty, inventive steps and practicability, and it has not been used in public or disclosed in any prior art reference. Therefore, the present invention conforms to the requirements for an invention patent.
Although the present invention has been described with reference to the foregoing preferred embodiments, it will be understood that the invention is not limited to the details thereof. Various equivalent variations and modifications can still occur to those skilled in this art in view of the teachings of the present invention. Thus, all such variations and equivalent modifications are also embraced within the scope of the invention as defined in the appended claims.
