Patent Application
20190264755
The disclosure concerns a clutch having two disk-shaped clutch bodies with face splines and a synchronizing mechanism for synchronizing the rotation speeds of the clutch bodies before engagement. The clutch bodies are axially spaced from each other and the one clutch body is arranged so as to be axially movable against the other clutch body to achieve engagement of the face splines.
DE 10 2014 209 936 B3 discloses a synchronizing mechanism for synchronizing the rotation speed of a clutch or brake of an automatic gearbox, inducing a first and a second disk each having face splines. The disks are axially spaced from each other and the one disk is axially movable against the other disk to achieve engagement of the face splines. At least one disk is connected rotationally fixedly to a synchronizer ring against which the disk can be moved axially against a return force. The synchronizer ring has a run-up face by means of which, on a movement of the disks against each other, it runs against a run-up face of the other disk.
The toothing in DE 10 2014 209 936 B3 is configured as roof-type toothing, i.e., the tooth flanks of a tooth run together from the tooth foot to the tooth head. With such face splines, the torques to be transmitted generate a high axial force component which presses the clutch disks apart.
A clutch according to the disclosure has face splines formed as claw-type toothing. A spring element is provided to release the clutch. To simplify the engagement of the teeth of the claw-type toothings, the claw-type toothings include roof-type toothings. The teeth of the claw-type toothings are formed so as to be substantially rectangular in outline and have tooth flanks which are formed parallel or almost parallel to each other. Here, the teeth of the claw-type toothing may have an undercut. This means that the tooth flanks run together in a wedge shape in an axially parallel direction so that a tooth foot is narrower than a tooth head. With such a configuration of the tooth flanks, an applied torque exerts an axial force which draws the clutch bodies together. This measure guarantees that the connection of the clutch bodies cannot be released during torque transmission.
In an exemplary embodiment, it is provided that the tooth flanks are formed rising slightly in the axially parallel direction, so that a tooth foot is wider than a tooth head. This measure facilitates the mutual engagement of the face splines on closure of the clutch, and release of the clutch is possible without problems. The rising tooth flank angle of the clutch is formed sufficiently flat that only a very slight axial force component is generated, so that a setting force for closing and holding the clutch closed is very low even at high torque levels.
To create a return force for releasing the clutch, at least one cup spring, a cup spring packet, for example, is provided which coaxially surrounds a gear part, e.g., a shaft. The shaft serves as a guide for an inner diameter of the cup spring. The cup spring is axially supported on a clutch body and on a synchronizer ring on the other clutch body which is arranged spaced therefrom. With this arrangement, the rotation speeds of the clutch bodies are synchronized before engagement of the face splines. In this way, the synchronizer ring is moved by means of the cup spring so far that the synchronizer ring comes into frictional contact with the clutch body. To this end, the synchronizer ring and the clutch body have a common friction face, e.g., a peripheral conical friction face.
In a second exemplary embodiment, to increase the cup spring force, the cup spring or a cup spring packet with greater diameter is used without requiring larger installation space. To this end, the outer diameter of the cup spring rests on a guide of the gear part, e.g., on a housing receiving the shaft. In this arrangement, the cup spring surrounds the clutch body coaxially outside the face splines.
Two exemplary embodiments of the disclosure are shown in the drawings and described below. The drawings show:
According to
The clutch bodies 2, 3 each have face splines 4, 6 which may be formed as claw-type toothing. The claw-type toothing in addition has a roof-type toothing. The teeth 4.1, 6.1 of the claw-type toothings 4, 6 each have tooth flanks 4.2, 6.2 which are arranged parallel or almost parallel to each other.
The first clutch body 2 according to
An annular spring 12, e.g. a cup spring or a cup spring packet, is provided between the clutch bodies 2, 3. This spring coaxially surrounds the gear part 7, is arranged inside the face splines 4, 6, and is supported axially firstly on the clutch body 2 and secondly on synchronizer ring 9. The inner periphery 13 of the cup spring 12 is guided on a guide 14, e.g. the outer periphery of the gear part 7. The cup spring 12 is here axially supported against an end face 16 of the clutch body 2 and an opposite end face 17 of the synchronizer ring 9. It may also be possible to guide the outer periphery 18 of the cup springs 12 using radially oriented stop faces 19, 21 formed on the clutch bodies 2, 3 as guides.
In a second exemplary embodiment according to
By combination of the exemplary embodiments in
| Number | Date | Country | Kind |
|---|---|---|---|
| 102016222539.1 | Nov 2016 | DE | national |
This application is the United States National Phase of PCT Appln. No. PCT/DE2017/100944 filed Nov. 7, 2017, which claims priority to German Application Nos. DE102016222539.1 filed Nov. 16, 2016, the entire disclosures of which are incorporated by reference herein.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/DE2017/100944 | 11/7/2017 | WO | 00 |
