JPS6246020Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a brake device attached to a friction clutch of a power transmission device employed in large vehicles such as buses and trucks.

The brake device uses friction to brake the driven shaft and smooth gear changes in the transmission after power transmission between the drive shaft and the driven shaft (input shaft of the transmission) is cut off by releasing the friction clutch. It is attached to the clutch.

[Prior art]

As one such brake device, for example, as described in Japanese Patent Application Laid-Open No. 47-8308, there is a sleeve (one end of which is connected to the inner peripheral end of the diaphragm spring) that is pushed in the axial direction by the release fork of the friction clutch. A pushing member that is provided integrally with the sleeve (which supports the engaging release bearing) and operates integrally with the sleeve pushes the non-rotating member that is non-rotatably assembled to the housing and moves it onto the driven shaft. There is one in which the driven shaft is brought into pressure contact with a rotating member integrally assembled with the shaft, and the rotation of the driven shaft is braked by the braking force generated by the pressure contact.

However, in the friction clutch of the above-mentioned publication, as the facing of the clutch disk wears out, the diaphragm spring tilts, and as a result, the release bearing, sleeve, release fork, etc. move integrally in the axial direction, and are integrated with the sleeve. A pushing member provided at a position moves away from the non-rotating member and the rotating member. Therefore, in the conventional brake device described above, as the facing of the clutch disk wears out, the distance between the pushing member and the non-rotating member gradually increases, causing the pushing member to direct the non-rotating member toward the rotating member. The movement stroke of the release fork required to push the release fork increases sequentially, and the braking timing of the driven shaft is sequentially delayed. Note that if there is a limit to the movement stroke of the release fork, the pushing member may no longer push the non-rotating member and braking may become impossible.

The solution to this problem is the British patent No.
It is disclosed in the specification of No. 1478920 and the specification of French Patent No. 2332457.

[Problem that the invention attempts to solve]

By the way, the means adopted in the device described in the above-mentioned British patent specification is to
It has a double structure as a member, and both sleeves are connected so that they can rotate together and move in the axial direction using a connecting member such as a bottle, and a locking member such as a ball is placed between both sleeves, and the locking member is moved in the axial direction. A biasing spring, a member for holding the lock member in the free position, a member for moving the lock member to the lock position, etc. are interposed, and when the sleeve on the diaphragm spring side moves in the axial direction, the release fork side (on which a pushing member is provided) can move freely relative to the sleeve (on which a pushing member is provided), and when the sleeve on the release fork side moves in the axial direction, it can move integrally with the sleeve on the diaphragm spring side. The structure is complicated and expensive.

In addition, the means adopted in the device described in the above-mentioned French patent specification has a double structure in which the sleeve is made of two members, and a screw nut mechanism, a slide bearing, a taper cone clutch, a spring, and a stopper are installed between the two sleeves. etc.,
When the sleeve on the diaphragm spring side moves in the axial direction as the facing wears, it can move freely relative to the sleeve on the release fork side (on which a pushing member is provided), and the sleeve on the release fork side moves in the axial direction. When moving in this direction, it is designed to move integrally with the sleeve on the diaphragm spring side, and this also has a complicated structure and is expensive.

[Means for solving problems]

The present invention solves the problems of the device disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 47-8308 by simplifying the means employed in the devices described in the British and French patent specifications. In order to solve this problem, a release fork is housed in a housing, rotatably supported by the housing, and biased toward the drive shaft by a diaphragm spring provided in the housing. By operating an operating mechanism including a clutch lever or a clutch pedal, the clutch disc assembled to the driven shaft is rotated against the action of the diaphragm spring, and the flywheel and pre-disc assembled to the drive shaft are rotated. attached to a friction clutch that is released from the shear plate to interrupt power transmission between the drive shaft and the driven shaft, and moves together with the release fork when the release fork is further rotated after the clutch disc is released; a non-rotating member which is movable in the axial direction and which is assembled to the housing concentrically with the driven shaft, is pushed by the pushing member, and the non-rotating member is assembled to the driven shaft so as to be integrally rotatable therewith. In a brake device that is brought into pressure contact with a rotating member to brake rotation of the driven shaft, the pushing member is rotatably assembled to the release fork so that it can advance and retreat with respect to the non-rotating member, A ratchet tooth and a ratchet pawl are provided between the pushing member and the release fork to allow rotation of the pushing member relative to the release fork toward the non-rotating member and restrict rotation in the opposite direction. Rotation limiting means, such as a ratchet mechanism type rotation limiting means, or a friction engagement type rotation limiting means, which is provided with a friction plate and a disc spring and applies a predetermined rotational resistance force to the rotation of the pushing member relative to the release fork. The present invention is characterized in that the housing is provided with a stopper that defines a retracted position of the pushing member relative to the non-rotating member.

[Effect of invention]

According to the present invention, in a friction clutch, as the facing of the clutch disk wears out, the diaphragm spring tilts, and when the release fork, etc. moves toward the drive shaft, the pushing member comes into contact with the stopper and retreats. Its movement (movement toward the drive shaft) is restricted, and it rotates relative to the release fork, and its retracted position is defined as a home position. Therefore, the distance between the pushing member and the non-rotating member in the retracted position is constant, and the movement stroke of the pushing member is always constant. Further, when the release fork is operated to release the friction clutch, the pushing member is operated together with the release fork due to mechanical engagement or frictional engagement of the rotation limiting means, and the friction clutch is operated by the release fork. After being released, the pushing member contacts the non-rotating member and presses the non-rotating member toward the rotating member. During this pressing, the relative rotation between the pushing member and the release fork is limited by the mechanical engagement or frictional engagement of the rotation limiting means, so that the required braking force can be obtained in the brake device.

[Effect of idea]

In the present invention, the movement stroke of the pushing member is always constant regardless of the wear of the facing of the clutch disk, and the pushing member contacts the non-rotating member after the friction clutch is released by the release fork. As a means to ensure that the action of pressing the non-rotating member against the rotating member is always obtained without changing, the pushing member is rotatably assembled to the release fork so that it can advance and retreat with respect to the non-rotating member. . A ratchet mechanism type rotation limiting means or a friction engagement type rotation limiting means is interposed between the pushing member and the release fork. The housing is provided with a stopper for defining a retracted position of the pushing member relative to the non-rotating member. Since this method has an extremely simple configuration, it can be implemented at an extremely low cost.

In addition, in the present invention, the release fork, which is housed in the housing, is rotatably supported by the housing, and is biased toward the drive shaft by a diaphragm spring provided in the housing, is connected to the clutch lever or the clutch pedal. The clutch disk mounted on the driven shaft is released from the flywheel and pressure plate mounted on the drive shaft by rotating against the action of the diaphragm spring by operating the operating mechanism including the drive shaft. Based on a friction clutch that interrupts power transmission between the drive shaft and the driven shaft, the friction clutch includes a pushing member, a stopper, a non-rotating member,
Since the brake device can be constructed by additionally providing rotating members and the like, there is also the advantage that parts can be shared with a friction clutch that does not require a brake device.

〔Example〕

An embodiment of the present invention will be described below based on the drawings.

In the power transmission device shown in FIG. 1, a flywheel 11 integrated with a drive shaft 10 is assembled with a pressure plate 12, a clutch cover 13, a diaphragm spring 14, a sleeve 15, and a release bearing 16, which constitute a friction clutch. A clutch disk 21 and a rotary friction plate 22 are connected to the driven shaft 20 by splines.
On the other hand, a clutch housing 30 that rotatably supports the driven shaft 20 includes a pair of non-rotating plates 31 and 3 that constitute a brake device with a rotating friction plate 22 and the like.
2 is attached to the driven shaft 20 so as to be movable concentrically and in the axial direction, and a release fork 33 is rotatably supported. The release fork 33 is rotated by the operation of a well-known operating mechanism including a clutch lever or a clutch pedal (not shown), and is rotated by the diaphragm spring 14 as the facing 21a of the clutch disk 21 wears out. It is moved toward the drive shaft 10 side together with the sleeve 15, release bearing 16, etc., and its return position is adjusted toward the drive shaft 10 side by an adjustment mechanism (not shown) included in the operating mechanism. Note that the non-rotating plate 31 on the right side is connected to the pusher 35 by the return spring 34.
The left non-rotating plate 32 is urged leftward by a return spring 36 (having a smaller elastic force than the return spring 34). Also, both ends of the release fork 33 are attached to the outer race 1 of the release bearing 16.
Both protrusions 17a, 17 of cover 17 fixed to 6a
It is engaged with a. This engagement is held elastically by each coil spring 18. (See Fig. 2) In this embodiment, as shown in Figs. Levers 50, 50 are coaxially assembled and are located in the clutch housing 30 opposite the non-rotating plate 32 to restrict the backward movement (movement to the left in FIG. 1) of the push levers 50, 50. Stoppers 60, 60 are provided to define the retracted position to the fixed position shown in the drawing, and after the release fork 33 has been rotated by a predetermined angle in the clockwise direction shown in FIG.
50 is adapted to push the left non-rotating plate 32 toward the rotating friction plate 22 and bring it into pressure contact. Each rotation limiting means 40 has a push lever 50 with a stopper 6
0, the release fork 33 is allowed to rotate in the counterclockwise direction in FIG. 1 (in other words, the push lever 50 rotates relative to the release fork 33), and the push lever 50 32 is pushed toward the rotating friction plate 22 to press the release fork 32, the relative rotation of the push lever 50 and the release fork 33 is restricted by mechanical engagement.As shown in FIG. It consists of a ratchet tooth 41 carved on the inner periphery of the boss portion of the lever 50 and a ratchet pawl 42 provided on the outer periphery of the boss portion of the release fork 33, and the ratchet pawl 42 engages with the ratchet tooth 41 elastically. In addition, each push lever 50
As shown in FIG. 2, both spacers 51,
52 and nut 53 restrict movement in the lateral direction.

In this embodiment configured as described above, when the release fork 33 is rotated by a predetermined angle clockwise in FIG. The diaphragm spring 14 is pushed away (to the right in the figure).
The biasing force on the pressure plate 12 is released, and the clutch disk 21 is moved to the flywheel 1.
1 and the pressure plate 12. Thus, when the release fork 33 is further rotated after the clutch disk 21 is released, the rotation limiting means 40 mechanically engages the release fork 33 in the counterclockwise direction as shown in FIGS. 1 and 3. The push lever 5 rotates integrally with the release fork 33 with its relative rotation restricted.
0,50, the left non-rotating plate 32 is pushed to the right and comes into pressure contact with the rotating friction plate 22, and the rotating friction plate 22
is held between both non-rotating plates 31 and 32, and rotation of the driven shaft 20 is braked.

Therefore, in this embodiment, as the facing 21a of the clutch disk 21 wears out, the diaphragm spring 14 tilts, and accordingly, when the release fork 33 and the like move toward the drive shaft 10, the push lever 50 is moved toward the stopper. 60 and its backward movement (movement toward the drive shaft 10 side)
is regulated to rotate relative to the release fork 33, and its retracted position is defined as the fixed position shown in the figure. Therefore, the distance between the push lever 50 in the retracted position and the non-rotating plate 32 is constant, and the movement stroke of the push lever 50 is always constant.

By the way, in this embodiment, regardless of the wear of the facing 21a of the clutch disk 21,
The movement stroke of the push lever 50 is always constant, and after the friction clutch is released by the release fork 33, the push lever 50 moves to the non-rotating plate 32.
As a means for always obtaining the effect of pressing the non-rotating plate 32 against the rotating friction plate 22 by contacting with the non-rotating plate 22, the push lever 50 is rotatably assembled to the release fork 33. It can move forward and backward relative to the rotating plate 32. Push lever 50
Rotation limiting means 40 is provided between the release fork 33 and the release fork 33.
Interpose. A non-rotating plate 32 is provided in the housing 30.
A stopper 60 is provided to define the retracted position of the push lever 50 relative to the position of the push lever 50. Since this method has an extremely simple configuration, it can be implemented at an extremely low cost.

Furthermore, in this embodiment, the flywheel 1
1, pressure plate 12, clutch cover 1
3, diaphragm spring 14, sleeve 1
5. Based on a friction clutch that is equipped with a release bearing 16, a release fork 33, etc., and which disconnects power transmission between the drive shaft 10 and the driven shaft 20, the friction clutch is equipped with a push lever 50, a stopper 60, and a non-rotating member. Since the brake device can be configured by additionally providing the plate 32, the rotary friction plate 22, etc., there is also the advantage that parts can be shared with a friction clutch that does not require a brake device. It will be done.

[Modified example]

In addition, when implementing the present invention, it is also possible to employ the rotation restriction means 140 shown in FIG. 4 in place of the rotation restriction means 40 of the above embodiment.
The rotation limiting means 140 includes a pair of friction plates 141, 1
41 and a disc spring 142, a predetermined preload is applied to the disc spring 142, and the push lever 5
0 relative rotation with respect to the release fork 33 is limited by a predetermined frictional engagement force. Note that the frictional engagement force is smaller than the elastic force of the diaphragm spring 14 and larger than the elastic force of the spring 36. Therefore, when the release fork 33 and the like are pushed and moved by the diaphragm spring 14 due to wear of the facing 21a, the push lever 50 is restricted from its retracted position by the stopper 60, and the retracted position is kept at the home position. After the release fork 33 is rotated relative to the push lever 50. Therefore, the distance between the push lever 50 in the retracted position and the non-rotating plate 32 is constant, and the movement stroke of the push lever 50 is always constant. Also, when the release fork 33 is operated to release the friction clutch,
The push lever 50 is actuated together with the release fork 33 due to the frictional engagement of the rotation limiting means 140, and after the friction clutch is released by the release fork 33, the push lever 50 comes into contact with the non-rotating plate 32. This is pressed toward the rotating friction plate 22. However, during this pressing, the pushing lever 5
Since the relative rotation between the release fork 33 and the release fork 33 is limited by the frictional engagement of the rotation limiting means 140, the required braking force can be obtained. It should be noted that the release fork 33 is further rotated than the push lever 50 is rotated to the position where it presses the non-rotating plate 32 toward the rotating friction plate 22.
Although relative rotation occurs between the push lever 50 and the release fork 33 when the lever 50 is rotated, the push lever 50 is moved counterclockwise in FIG. The required braking force described above can be obtained because the rotation of the brake is restricted.

Further, in the above embodiment, a brake device including a non-rotating plate 32, a rotating friction plate 22, etc. is used as the brake device, but the brake device is a non-rotating member that is pressed by contact with the pushing lever 50. (corresponding to the non-rotating plate 32) and a rotating member (corresponding to the rotating friction plate 22) that generates a braking force through engagement with the non-rotating member, and is not limited to the above embodiment. .

[Brief explanation of drawings]

Fig. 1 is a partial longitudinal sectional side view showing one embodiment of the present invention, Fig. 2 is a sectional view taken along the - line in Fig. 1, Fig. 3 is an enlarged sectional view taken along the - line in Fig. 2, and Fig. 4 is an enlarged sectional view taken along the - line in Fig. 2.
The figure is a partial sectional view showing another embodiment of the present invention. Explanation of symbols, 10... Drive shaft, 11... Flywheel, 12... Pressure plate, 13...
... Clutch cover, 14 ... Diaphragm spring, 15 ... Sleeve, 16 ... Release bearing, 17 ... Cover, 20 ... Driven shaft, 21
...Clutch disk, 22... Rotating friction plate (rotating member), 30... Housing, 32... Non-rotating plate (non-rotating member), 33... Release fork,
40, 140...Rotation limiting means, 50...Pushing lever (pushing member), 60...Stopper.

Claims (1)

[Claims for Utility Model Registration] (1) A release fork that is housed in a housing, rotatably supported by the housing, and biased toward the drive shaft by a diaphragm spring provided in the housing is connected to a clutch. By rotating against the action of the diaphragm spring by operating an operating mechanism including a lever or clutch pedal, the clutch disk assembled to the driven shaft is rotated to the flywheel and presser, which are assembled to the drive shaft. The friction clutch is attached to a friction clutch that is released from the plate to interrupt power transmission between the drive shaft and the driven shaft, and moves with the release fork when the release fork is further rotated after the clutch disc is released. A pushing member pushes a non-rotating member that is movable in the axial direction and is assembled to the housing concentrically with the driven shaft, so that the non-rotating member is assembled to the driven shaft so that it can rotate integrally with the driven shaft. In the brake device, the pushing member is rotatably assembled to the release fork so as to be movable toward and away from the non-rotating member, and the pushing member is rotatably attached to the release fork, and the pushing member is rotatably attached to the release fork. A rotation limiting means is interposed between the pushing member and the release fork, which allows the pushing member to rotate relative to the release fork toward the non-rotating member and restricts rotation in the opposite direction. and a brake device attached to a friction clutch, characterized in that the housing is provided with a stopper for defining a retracted position of the pushing member with respect to the non-rotating member. (2) A friction clutch attached to the friction clutch according to claim 1 of the registered utility model claim, characterized in that the rotation limiting means is a ratchet mechanism type rotation limiting means having ratchet teeth and a ratchet pawl. brake equipment. (3) The friction clutch according to claim 1 of the registered utility model, characterized in that the rotation limiting means is a friction engagement type rotation limiting means having a friction plate and a disc spring. brake equipment.