JPH0720428U - Clutch device - Google Patents

Abstract

(57) [Summary] [Purpose] To effectively mitigate the impact of the clutch connection in a wide rotation range. [Structure] A drive side disc 6 that rotates integrally with the drive side transmission shaft 2 and a driven side disc 8 that rotates integrally with the driven side transmission shaft 4 are alternately stacked, and both discs 6 and 8 are When the clutch connection is performed by pressing between the piston 10 and the receiving ring 12, a low speed buffer spring 13 and a high speed buffer spring 14 having different spring constants are provided between the piston 10 and the receiving ring 12. Clutch device.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a clutch device for intermittently operating traveling power of a tractor.

[0002]

[Problems to be Solved by Prior Art and Invention]

 In general, in this type of clutch device, a plurality of drive-side disks that rotate integrally with the drive-side transmission shaft and a plurality of driven-side disks that rotate integrally with the driven-side transmission shaft are alternately arranged in the axial direction. Along with the superposition of the disks, a receiving member whose axial movement is restricted and an axially movable pressing member are provided at the axial front and rear positions of the overlapping disks, respectively. Some of them are configured to transmit torque between the two shafts by the frictional force generated between the disks. However, in this type, when the pressing member is pressed with a constant pressure (hydraulic pressure, pneumatic pressure, etc.) to connect the clutch, a sudden frictional force is generated between the disks at a certain stage. There was the inconvenience of causing. Therefore, conventionally, it has been proposed to insert a buffer spring body between the receiving member and the pressing member. The spring body effectively works in a predetermined rotation range (low speed rotation range) to enable a smooth clutch connection, but in a high speed rotation range exceeding the rotation range, a pressing force for connecting the clutch is applied. However, there is a problem in that the spring body reaches the elastic limit at the time of connection and does not exert a cushioning effect.

[0003]

[Means for Solving the Problems]

 The present invention was devised with the object of providing a clutch device capable of eliminating these drawbacks in view of the above-mentioned circumstances, and a plurality of devices that rotate integrally with a drive-side transmission shaft are provided. The drive-side disc and a plurality of driven-side discs that rotate integrally with the driven-side transmission shaft are superposed alternately in the axial direction, and the axial movement is restricted to the axial front-back position of the superposed discs. And a pressing member that is movable in the axial direction are provided respectively, and torque transmission between the two shafts is transmitted by the frictional force between the disks that accompanies the disk pressing operation of the pressing member. The clutch device to be performed is characterized in that a plurality of buffer spring bodies having different spring constants are interposed between the receiving member and the pressing member. With this configuration, the present invention is able to effectively mitigate the impact when the clutch is connected in a wide rotation range.

[0004]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a clutch device provided in a traveling power transmission path of an agricultural tractor. The clutch device 1 includes a drive-side transmission shaft 2 that constantly rotates by engine power and an input shaft of a transmission 3. It is interposed between the driven side transmission shaft 4 and the transmission side shafts 4 and 4, but the transmission shafts 2 and 4 are arranged in series on the same shaft core, and a spline groove 2a for connecting the clutch is formed at the shaft end. 4a are formed in advance.

Reference numeral 5 denotes a drive-side rotary drum that rotates integrally with the drive-side power transmission shaft 2, and the drive-side rotary drum 5 is a boss cylinder portion that is fitted onto the spline groove 2 a of the drive-side power transmission shaft 2. 5a and a drum portion 5b formed to have a diameter larger than that of the boss cylinder portion 5a so as to overlap the driven side transmission shaft 4 are integrally formed in a stepped shape, and are formed on the outer peripheral surface of the drum portion 5b. In the spline groove 5c, a plurality of drive-side disks 6 are fitted which are integrally rotatable around the shaft center and are movable in the shaft center direction.

On the other hand, 7 is a driven-side rotary drum that rotates integrally with the driven-side transmission shaft 4, and the driven-side rotation drum 7 is a boss cylinder that is externally fitted in the spline groove 4 a of the driven-side transmission shaft 4. A drum portion 7b having a diameter larger than that of the boss cylinder portion 7a is integrally welded to the portion 7a so as to face each other at a predetermined radial interval. The boss cylinder portion 7a and the drum portion 7b are The drum portion 5b of the driving-side rotary drum 5 is inserted into the hollow portion 7c formed between the opposing surfaces of the spline, and the spline formed on the inner peripheral surface of the drum portion 7b (in this embodiment, communicating with the outer peripheral surface). A plurality of driven-side disks 8 are fitted in the groove 7d so as to rotate integrally around the shaft center and are movable in the shaft center direction. That is, the drive side disk 6 and the driven side disk 8 are interposed between the facing surfaces of the drum portion 5b of the driving side rotating drum 5 and the drum portion 7b of the driven side rotating drum 7, but the driving side disk 6 and It is superposed alternately with the driven disk 8 in the axial direction. A rubber plug 9 is attached to the fitting convex portion 8a of the driven disk 8 to prevent the clutch from rotating around.

Further, 10 is an annular piston which is mounted in the hollow portion 7c of the driven side rotating drum 7 so as to be slidable in the axial direction, and the piston 10 is normally provided at the front end of the boss cylinder portion 5a. It is located at the base end of the hollow portion 7c by the urging force of the return spring 11 mounted on the side outer periphery, but hydraulic pressure is applied to the hollow portion 7c via the oil passage 7e formed at the base end portion of the boss cylinder portion 7a. When supplied, it moves to the tip side of the hollow portion 7c against the biasing force of the return spring 11. When the piston 10 moves toward the tip side, the drive side disk 6 and the driven side disk 8 are moved between the piston 10 and the receiving ring 12 that is integrally fitted to the tip inner peripheral portion of the drum portion 7a. By pressing, the torque is transmitted (clutch connection) between the transmission shafts 2 and 4 by a frictional force generated between the disks 6 and 8 in accordance with the pressing.

Reference numeral 13 is a disc spring-shaped low-speed buffer spring interposed between the driven disk 8 and the receiving ring 12 located at the most tip side, and the low-speed buffer spring 13 is a piston. When the disk 10 is pressed by the disk 10 (clutch connection operation), it is elastically deformed in the compression direction to buffer the pressure contact between the disks 6 and 8. That is, as shown in FIG. 3 (A), the low speed buffer spring 13 exerts a buffering action from the pressure contact start stage A of the disks 6 and 8 to the stage B reaching the clutch connection pressure in the low speed rotation range, and the buffer action is performed. Based on the action, the shock when connecting the clutch in the low speed rotation range is alleviated.

Furthermore, 14 is a high-speed buffer spring interposed between the driven disk 8 and the piston 10 located at the most proximal end side, and the high-speed buffer spring 14 is the low-speed buffer spring. It is formed like a disc spring like the concussion spring 13, and elastically deforms in the compression direction when the piston 10 is pressed against the disc to buffer the pressure contact between the discs 6 and 8, but it is better than the low-speed relaxation spring 13. The spring constant is set large. That is, as shown in FIG. 3 (B), the high-speed cushioning spring 14 elastically deforms from the stage B when the low-speed cushioning spring 13 reaches the elastic limit, and exceeds the clutch connection pressure in the high-speed rotation range. In order to exert a buffering effect up to C, the impact at the time of clutch connection is mitigated in the high speed rotation range where the clutch connection pressure becomes higher than the low speed rotation range.

In the embodiment of the present invention configured as described above, a drive side disk 6 rotating integrally with the drive side transmission shaft 2 and a driven side disk 8 rotating integrally with the driven side transmission shaft 4. And the disks 6 and 8 are pressed together between the piston 10 and the receiving ring 12 to make a clutch connection. However, between the receiving ring 12 and the disks 6 and 8, While a low speed buffer spring 13 is provided, a high speed buffer spring 14 is provided between the piston 10 and the disks 6, 8. The buffer springs 13 and 14 buffer the pressure contact between the disks 6 and 8 associated with the disk pressing operation of the piston 10 to reduce the impact when the clutch is connected, but the buffer springs 13 and 14 have different spring constants. Therefore, each of them has a buffering effect in a different rotation range. Therefore, even if the clutch connection pressure changes depending on the rotation range, the impact at the time of clutch connection can be reliably mitigated, and as a result, the impact is mitigated by a single buffer spring as in the conventional case. It is possible to completely eliminate the inconvenience that the shock-absorbing spring reaches the elastic limit and cannot absorb the shock.

Moreover, since shock can be alleviated when the clutch is connected with an extremely simple structure in which a buffer spring is simply added, the cost can be significantly reduced compared to the case where shock is alleviated based on the control of the pressing force of the piston 10. It is possible to provide a highly reliable clutch device that does not have a fear that the operation becomes unstable due to pressure control error due to temperature change and the like.

It is needless to say that the present invention is not limited to the above-mentioned embodiment, and the point is that a plurality of buffer spring bodies having different spring constants are provided between the receiving member and the pressing member. It is needless to say that the number of springs and the arrangement position can be freely changed because the spring is interposed.

[0013]

[Operation effect]

 In short, since the present invention is configured as described above, the driving side disk and the driven side disk that are alternately superposed are pressed between the pressing member and the receiving member, and the frictional force generated between both disks is Although the torque is transmitted based on the above, a plurality of buffer spring bodies having different spring constants are interposed between the receiving member and the pressing member. In other words, each spring body cushions the disk pressing operation by the pressing member to alleviate the impact at the time of clutch connection, but since multiple springs with different spring constants are interposed, it depends on the rotational speed. Even if the pressing force at the time of connection changes, one of the spring bodies will certainly exert its cushioning effect. Therefore, it is possible to eliminate the disadvantage that the spring body reaches the elastic limit and generates a large impact as in the conventional case where the shock when connecting the clutch is alleviated by a single spring body. You can make a smooth clutch connection regardless of the area.

Moreover, since the present invention can be carried out with an extremely simple structure such as adding a spring body, it is possible to achieve a significant cost increase like a pressure control valve using a pressure control valve or the like. However, there is no fear that the operation will become unstable due to pressure control error due to temperature change, etc. Therefore, an excellent clutch device with stable operation can be provided at low cost. .

[Brief description of drawings]

FIG. 1 is a sectional view of a clutch device.

FIG. 2 is a partial perspective view of a driven disk.

FIG. 3A is an operation explanatory diagram when the clutch is connected in the low speed rotation range, and FIG. 3B is an operation explanatory diagram when the clutch is connected in the high speed rotation range.

[Explanation of symbols]

 1 Clutch device 2 Drive side transmission shaft 4 Driven side transmission shaft 5 Drive side rotating drum 6 Drive side disc 7 Driven side rotating drum 8 Drive side disc 10 Piston 12 Bearing ring 13 Low speed buffer spring 14 High speed buffer spring

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Toru Hirota, Toru Hirota, 667 Izamiya-cho, Higashi-Izumo-cho, Yatsuka-gun, Shimane Prefecture 1 Mitsubishi Agricultural Machinery Co., Ltd. 667 1 Mitsubishi Agricultural Machinery Co., Ltd. (72) Kazuo Matsumoto 667 Izuyacho, Higashi Izumo-cho, Yatsuka-gun, Shimane Prefecture 667 1 Mitsubishi Agricultural Machinery Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A plurality of drive-side disks, which rotate integrally with a drive-side transmission shaft, and a plurality of driven-side disks, which rotate integrally with a driven-side transmission shaft, are alternately superposed in the axial direction and superposed. In the axial front and rear positions of the disk, a receiving member whose axial movement is restricted and a pressing member movable in the axial direction are provided respectively, and friction between the disks generated by the disk pressing operation of the pressing member is provided. In the clutch device for transmitting torque between the both shafts by force, a plurality of buffer spring bodies having different spring constants are interposed between the receiving member and the pressing member. .