JPH06193732A - Clutch device for gear type transmission - Google Patents

Abstract

PURPOSE:To permit the transmission of a large torque by the small-sized constitution by arranging a number of frictional plates which are engaged alternately between a transmission shaft and a speed change gear which is axially supported with the transmission shaft and frictionally engaging each frictional plate by a hollow working body which is expanded by the fluid pressure. CONSTITUTION:A piston 13 is shifted to the position corresponding to the speed change gear 5 at a prescribed stage position, e.g. intermediate speed stage position, and the discharge port 15a of a fluid feeding passage 15 is opposed to the flow passage 30 of a hollow working body 27 on the speed change gear 5 side, and then the fluid supplied from a fluid booster is allowed to flow into the hollow working body 27 consisting of a flexible rubber sheet from a fluid feeding passage 15. Then, the hollow working body 27 extends in the axial direction, and a pressurizing plates 25 separate in the axial direction each other, and the left and right frictional plates 26 shift outward in the axial direction and are press-attached on the pressure receiving plates 22 on the left and right sides. The torque of an input shaft 2 is transmitted to an output shaft 3 through the speed change gear 5 at the intermediate speed stage position through the frictional engagement of each frictional plate 26 and the pressure receiving plate 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clutch device for a gear type transmission that shifts the rotation of an input shaft and transmits it to an output shaft.

[0002]

2. Description of the Related Art As a conventional technique, there is one described in Japanese Patent Application No. 3-330133 filed by the present applicant. In FIG. 2, reference numeral 1 denotes a constant mesh gear type transmission, which has the following structure. That is, the input shaft 2 (one transmission shaft) and the output shaft 3 (the other transmission shaft) are provided with transmission gears 4, 5, 6 of high speed, medium speed, and low speed from left to right. Always mesh and support. The transmission gears 4a, 5a, 6a supported on the input shaft 2 are rotatably supported on the input shaft 2 and the transmission gears 4b, 4b supported on the output shaft 3, respectively.
5b and 6b are fixedly supported on the output shaft 3.

A clutch portion having substantially the same structure is provided in each of the transmission gears 4a, 5a, 6a. This will be described with reference to FIG. 3 as a representative of the clutch portion 7 provided on the transmission gear 5a at the middle speed stage. That is, the accommodating portion 8 having a rectangular cross section and an annular shape is formed at the axial center of the transmission gear 5a, and the accommodating portion 8 accommodates the hollow actuating body 9 which is expandable by fluid pressure. This hollow actuator 9
Fixes the leg portion 9b on the shaft center side to the input shaft 2, and fixes the friction plates 10 on the left and right sides of the main body 9a.
Are made to face the left and right inner surfaces of the housing portion 8.

The inside of the hollow actuating body 9 is communicated with a cylinder chamber 12 formed at the axial center of the input shaft 2 by a communication passage 11, and a piston 13 is slidably fitted in the cylinder chamber 12. This piston 13 has its rod 14 connected to the input shaft 2
To the right from the piston 13 and the rod 14
A fluid supply path 15 is formed therein. The fluid supply passage 15 has a discharge port 15a at its left end opened at the bottom of an annular groove formed on the outer circumference of the piston 13. As shown in FIG. 2, the right end of the fluid supply path 15 is connected to a rotary joint 16 rotatably connected to the right end of the rod 14, and the rotary joint 16 serves as a fluid pressure source via a hose 17. It is connected to the liquid intensifier 18.

The piston 13 is moved in the left and right directions in the cylinder chamber 12 by a shift mechanism (not shown), and the discharge port 15a of the fluid supply passage 15 is connected to the transmission gear 4a at each stage.
6a to 6a are selectively communicated with the respective communication passages 11 of the hollow operating body 9. The liquid booster 18 has the discharge port 15a.
When the clutch-ON signal is input in a state where the hollow operating body 11 communicates with the predetermined communicating passage 11, the oil is pumped to supply the oil to the corresponding hollow operating body 9 to expand the hollow operating body 9 and When an off signal is input, the hydraulic pressure is released to return the oil in the corresponding hollow operating body 9 to contract the hollow operating body 9. In FIG. 3, 19 is a boss for fixing the leg portion 9b of the hollow operating body 9 to the input shaft 2, and 2
Reference numeral 0 denotes a bearing that rotatably supports the transmission gear 5a.

Then, the piston 13 is moved to a position corresponding to the transmission gear 5 at a predetermined stage, for example, a medium speed stage, and the discharge port 15a of the fluid supply passage 15 is connected to the communication passage 11 of the hollow operating body 9 on the transmission gear 5 side. While facing the clutch
When an ON signal is issued, the fluid from the fluid pressure booster 18, that is, oil, flows through the fluid supply passage 15 and the communication passage 11 and flows into the main body portion 9a of the hollow operating body 9, and the main body portion 9a is axially moved. And the friction plate 10 expands to the accommodating portion 8 of the transmission gear 5a.
The inner surfaces of both sides are pressed and frictionally engaged. As a result, the torque of the input shaft 2 is transmitted to the output shaft 3 via the transmission gear 5 of the medium speed stage. Further, the friction heat between the friction plate 10 and the inner surface of the accommodating portion 8 is cooled by the oil in the main body portion 9a.
When a clutch-off signal is issued from the above state, the hydraulic pressure of the fluid pressure booster 18 is released, the hollow operating body 9 contracts, the friction plates 10 separate from the inner surfaces of both sides of the accommodating portion 8 of the transmission gear 5a, and the input shaft The torque transmission from 2 to the output shaft 3 is cut off.

[0007]

In the above, the friction plates 10 fixed to both sides of the main body portion 9a of the hollow operating body 9 are frictionally engaged with both inner surfaces of the accommodation portion 8 of the transmission gear 5a. Therefore, there is a drawback that the frictional force cannot be increased in a limited diameter. SUMMARY OF THE INVENTION It is an object of the present invention to obtain a novel gear type clutch device for a gear type transmission that solves the above-mentioned drawbacks.

[0008]

The present invention is configured as follows to achieve the above object. That is, a transmission gear is rotatably supported on one transmission shaft, and a pair of pressure plates, a number of friction plates and a pair of pressure receiving plates are axially outward from the central portion in the axial direction between the transmission shaft and the transmission gear. The pressure plates are engaged with the transmission shaft so that they cannot rotate relative to each other and are movable in the axial direction, and expandable hollow actuating bodies are interposed between the pressure plates, and the friction plates are adjacent to each other in the axial direction. The friction plates are alternately engaged with the transmission shaft and the transmission gear so that they cannot rotate relative to each other and are movable in the axial direction.The pressure receiving plates are fixed on both sides of the transmission gear, and the chamber of the hollow actuator is located at the axial center of the transmission shaft. A communication passage is provided to communicate with the formed cylinder chamber, a piston that moves in the cylinder chamber in the axial direction is provided, and one end of the piston is formed on the outer peripheral surface of the piston and can face the communication passage. And the other end is connected to an external fluid pressure source Is obtained by the configuration in which the fluid supply passage.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, FIG. 1 is an enlarged sectional view of an essential part of a clutch portion showing an embodiment of the present invention. In addition, in FIG. 1, portions having the same reference numerals as those in FIGS. 2 and 3 have substantially the same structure as those in FIGS. 2 and 3. In FIG. 1, reference numeral 5 a denotes a medium-speed shift gear rotatably supported on the input shaft 2, and a clutch portion 21 is mounted between the input gear 2 and the gear. The clutch portion 21 is as follows. That is, the inner diameter of the speed change gear 5a is formed larger than that of the boss 19 fixed to the outer circumference of the input shaft 2, and the pressure receiving plate 22 fixed to the left and right sides of the speed change gear 5a is formed.
Thus, it is concentrically and rotatably supported by the input shaft 2 via the bearing 20, and an annular accommodating portion (reference numeral omitted) is formed inside.

Spline teeth 2 extending in the axial direction on the inner periphery of the transmission gear 5a and the outer periphery of the boss 19 which form the above-mentioned accommodating portion.
3 and 24 are formed. A pair of pressure plates 25 and a large number of friction plates 26 are sequentially arranged in the accommodating portion 22 from the axial center toward the axially outward (left and right), and the pressure plates 25 are arranged on the spline teeth 24 on the input shaft 2 side. A hollow actuating body 27 that is inflatable is provided between the pressure plates 25 while engaging with each other such that they cannot rotate relative to each other and are movable in the axial direction. Further, the friction plates 26 adjacent to each other in the axial direction are engaged with the spline teeth 24 of the input shaft 2 and the spline teeth 24 of the boss 19 alternately so as to be relatively non-rotatable and axially movable. The outermost (right and left end) friction plates 26 face the inner surface of each pressure receiving plate 22.

The hollow actuating member 27 is formed by bending a flexible rubber sheet in a ring shape and in a U-shape so that the open end faces the axial center, and the open end (axial center) of the metal fitting 2 having an L-shaped cross section.
It is fixed to the input shaft 2 side by 8. Each of the pressure plates 25 is provided with a concave portion in the facing surface portion on the axial center side, the outer peripheral portion of the hollow actuating body 27 is fitted in the concave portion, and a cylindrical shielding plate 29 is provided in the outer peripheral wall portion of the concave portion. It is slidably fitted in the axial direction to prevent the outer peripheral wall of the hollow operating body 27 from being deformed radially outward. The interior of the hollow actuating body 27 is communicated with the cylinder chamber 12 formed at the axial center portion of the input shaft 2 by a communication passage 30 penetrating the input shaft 2 in the radial direction. Reference numeral 31 is an oil supply passage for cooling the friction plate 26. In addition, the others are shown in FIG.
The structure is similar to that shown in FIG.

Next, the operation mode of the above embodiment will be described. The piston 13 is moved to a position corresponding to the transmission gear 5 at a predetermined stage, for example, a medium speed stage, and the discharge port 15a of the fluid supply passage 15 faces the communication passage 30 of the hollow operating body 27 on the transmission gear 5 side. When the clutch ON signal is issued, the fluid from the fluid pressure booster 18 (FIG. 2), that is, the oil, flows through the fluid supply passage 15 and the communication passage 30 and flows into the hollow actuation body 27, and the hollow actuation body 27. The outer peripheral portion of the expands in the axial direction. Then, the pressure plates 25 are separated from each other in the axial direction (left-right direction), and the left and right friction plates 26 are moved outward in the axial direction to be pressed against the pressure receiving plates 22 at the left and right ends.

As a result, each friction plate 26 and pressure receiving plate 2
2 are frictionally engaged with each other, and the torque of the input shaft 2 is transmitted to the output shaft 3 via the transmission gear 5 of the medium speed stage. In this case, since many friction plates 26 are axially overlapped and frictionally engaged, the transmission gear 5a (4) having the clutch portion 21
Even if the diameter of a, 6a) is small, the torque transmission force will increase. When a clutch off signal is issued from the above state, the hydraulic pressure of the fluid pressure booster 18 is released, the hollow operating body 27 contracts, and the pressure plates 25, the friction plates 26, and the pressure receiving plates 22 are separated from each other, and the input The torque transmission from the shaft 2 to the output shaft 3 is cut off. The fluid of the fluid pressure booster 18 may be air.

[0014]

As is apparent from the above description, according to the present invention, a large number of friction plates are alternately engaged between one transmission shaft and a transmission gear rotatably supported by the transmission shaft. Are arranged in the axial direction, and these friction plates are frictionally engaged with each other by the hollow actuating body that is expanded by the fluid pressure. Therefore, there is an effect that a large torque can be transmitted while being made small.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of an essential part of a clutch unit according to the present invention.

FIG. 2 is a front view of a constant mesh gear type transmission to which the present invention is applied.

FIG. 3 is an enlarged cross-sectional view of a main part of a conventional clutch part.

[Explanation of symbols]

 1 constant mesh transmission 2 input shaft (transmission shaft) 3 output shaft (transmission shaft) 4 high speed gear shift gear 4a high speed gear shift gear provided on the input shaft 4b high speed gear shift gear provided on the output shaft 5 Medium High-speed transmission gear 5a Medium-speed transmission gear provided on input shaft 5b Medium-speed transmission gear provided on output shaft 6 Low-speed transmission gear 6a Low-speed transmission gear provided on input shaft 6b Output shaft Provided low-speed gears 12 Cylinder chamber 11 Communication passage 13 Piston 14 Rod 15 Fluid supply passage 16 Rotary joint 17 Hose 18 Fluid pressure booster (fluid pressure source) 19 Boss 20 Bearing 21 Clutch 22 Pressure receiving plate 23 Spline 24 Spline 25 Pressure plate 26 Friction plate 27 Hollow actuating body 28 Metal fitting 29 Shielding plate 30 Communication passage 31 Oil supply passage

Claims (1)

[Claims] 1. A transmission gear is rotatably supported on one transmission shaft, and a pair of pressure plates are provided between the transmission shaft and the transmission gear.
A large number of friction plates and a pair of pressure receiving plates are sequentially arranged from the center in the axial direction outward in the axial direction, and the pressure plates are engaged with the transmission shaft so that they cannot rotate relative to each other and are movable in the axial direction. A hollow actuating body that is inflatable is interposed between the friction plates, and the friction plates that are axially adjacent to each other are alternately engaged with the transmission shaft and the transmission gear such that they cannot rotate relative to each other and are movable in the axial direction. Is provided on both sides of, and a communication passage for communicating the interior of the hollow operating body with a cylinder chamber formed in the axial center of the transmission shaft is provided, and a piston for axially moving in the cylinder chamber is provided,
A fluid supply passage is formed in the piston, one end of which opens to the outer peripheral surface of the piston so as to face the communication passage, and the other end of which is connected to an external fluid pressure source. Clutch device for gear type transmission.