JPH0720419Y2 - Clutch release device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The clutch release device according to the present invention is incorporated in a main drive transmission of an automobile and is used for pressing a central portion of a diaphragm spring when a gear shift operation is performed. It is especially effective when applied to small FF vehicles.

(Prior Art) In the case of an automobile provided with a manual transmission, it is necessary to prevent the driving force of the engine from being transmitted to the transmission by operating a clutch mechanism when performing a shift operation.

As is well known, such a clutch mechanism has a flywheel that rotates together with an engine crankshaft, a clutch disc that rotates together with an input side rotation shaft of a transmission, and a diaphragm spring that presses this clutch disc toward the flywheel. And a clutch release device that presses the central part of the diaphragm spring when the clutch pedal is depressed, and the structure of a manual transmission incorporating such a clutch release device is described. A brief description will be given with reference to FIG. 4, which shows a structure that is generally used for (vehicles in which front wheels are driven by an engine laterally arranged at the front of the vehicle body).

In the casing 1 of the transmission, two rotary shafts 2 and 3 are supported in parallel with each other on the input side and the output side, and gears 4a and 4b fixed to an intermediate portion of the rotary shaft 2 on the input side are provided. The gears 5a and 5b mounted on the intermediate portion of the output side rotary shaft 3 are connected to the input side rotary shaft 2
The gears 4c and 4d mounted on the intermediate part of the gear and the gears 5c and 5d fixedly mounted on the intermediate part of the output side rotary shaft 3 are meshed with each other, and the power from the input side rotary shaft 2 to the output side rotary shaft 3 is transmitted. Communication is free. Synchronous meshes 6a and 6b are provided between the output-side rotating shaft 3 and the gears 5a and 5b, and between the input-side rotating shaft 2 and the gears 4c and 4d. 5a) is connected to either the input side or the output side of the rotating shafts 2, 3 and the other gears (eg 5b, 4c, 4d) are connected to the input side or the output side rotating shafts 2, 3 By making it rotatable, the input side, output side, between both rotary shafts 2, 3,
The gear ratio can be changed.

The rotational driving power of the output-side rotary shaft 3 is transmitted to another gear 8 meshed with a gear 7 fixed to the end of the rotary shaft 3, and further via a differential gear 49, a pair of left and right drive shafts ( (Not shown).

The manual transmission is configured as described above, but gears 5a, 5b, 4c connected to the input-side or output-side rotating shafts 2, 3 by the synchromesh 6a, 6b are used to perform the shifting operation. When switching 4d (when one of the previously operating synchromesh is deactivated and another synchromesh that was previously inoperative is activated), the engine crankshaft is temporarily It is necessary to prevent the driving force of 1 from being transmitted to the input side rotating shaft 2 of the transmission.

Therefore, conventionally, a flywheel, a clutch disc, and a clutch disk are provided between the crankshaft and the input-side rotary shaft 2.
A clutch mechanism consisting of a diaphragm spring and a clutch release device is provided, and a clutch release mechanism that operates in response to depression of the clutch pedal adjusts the inclination angle of the diaphragm spring so that the flywheel rotates with the crankshaft. , The clutch disc which rotates together with the input side rotating shaft 2 is connected and disconnected.

As a clutch release device for changing the inclination angle of the diaphragm spring as described above, conventionally, as shown in FIG. 4, it is fixed to a partition wall 14 portion provided in the casing 1 so as to surround the input side rotating shaft 2. Guide tube 9 and this guide tube 9
The clutch release bearing 10 is movably supported in the axial direction (left and right direction in FIG. 4) and the clutch release bearing is supplied based on the supply of pressure oil to the release cylinder when the clutch pedal is depressed. A structure including a release fork (not shown) that presses 10 onto the diaphragm spring has been widely used.

However, in the case of the clutch release device having the above-mentioned structure, since the release cylinder and the release fork are provided, the number of parts is increased, and not only the assembly work of each part is troublesome, but also the operation feeling when the clutch is disengaged. (Feeling transmitted to driver's foot) was not always good. In order to solve such a problem, pressure oil sent with the depression of the clutch pedal is used to directly move the clutch release bearing (without passing through a release fork or the like). As a structure in which the clutch release bearing is directly moved by pressure oil, for example, a structure disclosed in Japanese Utility Model Laid-Open No. 61-154329 is known.

This conventional structure, as shown in FIG.
An annular piston body 12 is oil-tightly fitted in a cylinder 11 having an annular cross section, which is provided around a guide cylinder 9 fixed to the portion, and the movement of the piston body 12 is controlled by the clutch release bearing 10. It is configured to be freely transmitted to the anvil 13 of.

With this structure, when pressure oil is sent into the cylinder 11 as the clutch pedal is depressed, the piston body 1
2. The clutch release bearing 10 moves to the left in FIG. 5 via the anvil 13 and presses the central portion of the diaphragm spring.

By the way, in the case of the conventional structure configured as described above, since the cylinder 11 and the anvil 13 are arranged in series, the total length of the clutch release device (axial direction (left and right direction in FIG. 5)).
In some cases, it becomes difficult to install the clutch mechanism in the limited space in the casing 1 (see FIG. 4).

As a structure for solving such inconvenience, the present applicant previously proposed a structure as shown in Japanese Patent Application No. 62-296200.

As shown in FIG. 6, the clutch release device according to the present invention is constructed such that a short cylinder-shaped cylinder tube 15 fixed to a partition wall 14 provided in a casing 1 has a short cylinder-shaped anvil.
16 is oil-tightly fitted inside, and the clutch release bearing 10 is attached to the tip portion (left end portion in FIG. 6) of the anvil 16.

The inner peripheral surface 17 of the cylinder cylinder 15 has a large diameter portion 17a near the tip (left side in FIG. 6) and a small diameter portion 17b near the base end, and a step portion 17c.
The outer surface 18 of the anvil 16 has a large-diameter portion 18a near the tip and a small-diameter portion 18b near the base end that are continuous at a step 18c. The portion 17a and the large diameter portion 18a of the outer peripheral surface 18 are connected to the small diameter portion 17b of the inner peripheral surface 17 and the outer peripheral surface.
The 18 small-diameter portions 18b are brought into sliding contact with each other in an oil-tight manner.

Due to the large diameter portion 17a of the inner peripheral surface 17 and the small diameter portion 18a of the outer peripheral surface 18, and the step portions 17c and 18c formed in the intermediate portion between the both peripheral surfaces 17 and 18,
In the space 19 surrounded by the periphery, pressure oil can be freely supplied and discharged through a supply / discharge port 20 and a supply / discharge passage 21 provided in the anvil 16.

Since the clutch release device according to the previous invention is configured as described above, by supplying and discharging pressure oil through the supply / discharge port 20,
Clutch release bearing 10 supported on the tip of anvil 16
The clutch mechanism can be elastically contacted by moving the shaft in the axial direction (left and right in FIG. 6) and adjusting the force pressing the central portion of the diaphragm spring.

In the case of such a clutch release device according to the prior invention, the space 19 and the anvil 16 that function as hydraulic cylinders.
And are provided in parallel with each other, the total length of the clutch release device can be shortened.

(Problems to be solved by the invention) However, in the case of the clutch release device of the prior invention, which is constructed and operates as described above, the outer diameter dimension may become large (become thicker) instead of shortening the overall length of the device. Inevitable.

As described above, the clutch release device is mounted on the partition wall 14 provided in the casing 1 of the transmission, and one end of the output side rotating shaft 3 is supported near this mounting part as shown in FIG. Bearing housing 23 containing rolling bearing 22 for
Therefore, when the outer diameter of the anvil forming the clutch release device becomes large, this outer peripheral surface interferes with the outer surface of the bearing housing 23.

Further, in order to prevent the anvil 16 from rotating in the cylinder cylinder 15, it is necessary to provide a mechanism for preventing rotation between both members 15 and 16, which complicates the structure of the clutch release device. .

The clutch release device of the present invention reduces the outer diameter of the anvil without increasing the length and at the same time prevents the anvil from rotating even if a structure for preventing rotation is not provided. The inconvenience as described above is solved.

(Means for Solving the Problem) Among the clutch release devices of the present invention, the one described in claim 1 is a guide cylinder surrounding an input side rotation shaft of a transmission and a casing of the transmission. A holding body to which the guide tube is fixed, a tubular anvil that is movably fitted in the guide tube of the holding body in the axial direction, and one end of the anvil. Fixed to the end of the arm bearing projecting in the outer peripheral direction from the other end of the anvil, and at least one cylinder provided on the mounting portion side of the holding body. It is composed of a piston that is oil-tightly fitted to the cylinder.

Further, in the case of the clutch release device according to the third aspect, the guide cylinder can be omitted instead of providing a plurality of cylinders and pistons.

(Operation) In the case of the clutch release device of the present invention configured as described above, by supplying / discharging pressure oil to / from the cylinder provided on the holder, the piston fitted to this cylinder is moved. The anvil, to which the piston is fixed, moves axially via the arm piece, and the release bearing supported at one end of the anvil causes the clutch to be engaged and disengaged.

Since the arm for fixing the piston to the anvil is provided only in a part of the outer periphery of the anvil, if the mounting direction of the clutch release device is appropriately selected, the outer periphery of the anvil and a part of the casing are provided. And will not interfere.

(Embodiment) Next, the present invention will be described in more detail with reference to the illustrated embodiment.

1 and 2 show a first embodiment of the present invention, FIG. 1 is a longitudinal side view, and FIG. 2 is a view seen from the left side of FIG.

Reference numeral 24 denotes a mounting portion. A circular hole 25 is formed in the central portion of the mounting portion 24 so that the input side rotary shaft 2 (see FIG. 4) can be inserted therethrough. Flange 26, 26 is provided.

Further, the base end of a cylindrical guide tube 32 is continuous with the peripheral edge of the circular hole 25, and one end (first to second) of the mounting portion 24 is further connected.
A cylinder part 28 is provided at the upper end of the figure).
A cylinder hole 29 having a circular cross section is formed in the opening 28 only at the tip (the left end in FIG. 1). And the cylinder part
A supply / discharge port 30 for supplying / discharging pressure oil to / from the cylinder hole 29 is provided above the cylinder hole 29. A bleeder screw for removing air mixed in the working oil is attached to an oil hole 31 which is provided on the side of the supply / discharge port 30 and also communicates with the cylinder hole 29. However, depending on the convenience of installation,
And the oil hole 31 may be reversed.

The mounting portion 24 having the guide cylinder 32 and the cylinder portion 28 configured as described above is attached to the partition wall 14 of the casing 1 by the bolts (not shown) inserted into the circular holes 27, 27 of the mounting flanges 26, 26.
It is fixed to the part (see Fig. 4), but in this case,
The cylinder portion 28 is located on the opposite side of the bearing housing 23 provided in the casing 1. That is, as shown in FIG. 4, when the clutch release device is provided above the bearing housing 23, the cylinder portion 28 is located at the upper end portion of the mounting portion 24.

The partition wall 14 of the casing 1 is constructed as described above, and as described above.
A cylindrical anvil 16 is provided around the guide tube 32, which is fixed to the mounting portion 24 that is fixed to the part, so as to be movable in the axial direction (left and right direction in FIG. 1, front and back direction in FIG. 2). It is provided.

That is, in the cylindrical clearance 33 formed between the outer peripheral surface of the guide cylinder 32 and the inner peripheral surface of the anvil 16, a large number of balls 35, 35 rotatably held by the cage 34 are provided. By providing
The anvil 16 is displaced relative to the fixed guide tube 32 with a light force in the axial direction.

A first compression spring 36 is provided between the base end edge (the end edge in FIG. 1) of the cage 34 and the mounting portion 24, and the tip edge of the cage 34 and the anvil 16 are provided.
A second compression spring 38 is provided between each of the second compression springs 38 and the collar portion 37 formed on the inner peripheral edge of the tip end of the retainer 34, which holds a large number of balls 35, 35, unless the external force is applied. And Tsubabe 37
It is supposed to exist in a neutral position between and.

The inner ring 40 of the clutch release bearing 10 is externally fitted and fixed to the step portion 39 formed at the tip of the anvil 16, thereby supporting the clutch release bearing 10 at the tip of the anvil 16. And the outer ring of this clutch release bearing 10
The leading edge of 41 is brought into contact with the central portion of diaphragm spring 42 that constitutes the clutch mechanism.

Furthermore, an arm piece 43 is provided above the anvil 16
It is formed integrally with. A circular hole 46 parallel to the guide tube 32 is formed at the tip of the arm piece 43, and the piston 45 is fixed to the arm piece 43 by a screw 44 inserted through the circular hole 46. The piston 45 is fitted in the cylinder hole 29 formed in the cylinder portion 28 at the upper end of the mounting portion 24,
The packing 47 maintains the oil tightness between the outer peripheral surface of the piston 45 and the inner peripheral surface of the cylinder hole 29.

With the clutch release device of the present invention configured as described above, the central portion of the diaphragm spring 42 is pressed, the inclination angle of the diaphragm spring 42 is changed, and the clutch mechanism is disengaged (rotation of the engine crankshaft , So as not to be transmitted to the input side rotary shaft 2 of the transmission), the pressure oil sent along with the depression of the clutch pedal is transferred to the cylinder 28 of the cylinder portion 28 provided at the upper end of the mounting portion 24. Feed into hole 29.

As a result, the piston 45 fitted in the cylinder hole 29 becomes
Moving to the left in FIG. 1, the anvil 16 is
The outer ring 41 of the clutch release bearing 10, which moves in the same direction along the guide tube 32 and is supported by the tip of the anvil 16,
The central portion of the diaphragm spring 42 is pressed to disengage the clutch.

When engaging the clutch after shifting with the clutch disengaged, release the foot from the clutch pedal to release the hydraulic pressure applied to the cylinder hole 29. By anvil
16 is pushed to the right in FIG. 1, the inclination angle of the diaphragm spring 42 returns to its original value, and the clutch is engaged. At the same time, a piston 45 connected to the anvil 16 via the arm piece 43
Is pushed into the cylinder hole 29.

When the clutch is engaged and disengaged in this manner, the anvil 16 is displaced in the axial direction with respect to the fixed guide tube 32, but between the inner peripheral surface of the anvil 16 and the outer peripheral surface of the guide tube 32. , A large number of balls
Since the members 35 and 35 are provided, the both peripheral surfaces do not dig into each other, and the members 16 and 32 can be smoothly displaced.

That is, when the pressure oil is sent into the cylinder hole 29 to disengage the clutch and the piston 45 is moved to the left in FIG. 1, the anvil 16 has a direction in which the anvil 16 is inclined with respect to the axial direction. Since a force is applied, the inner peripheral surface of the anvil 16 and the outer peripheral surface of the guide tube 32 are easily meshed with each other as they are, and when they are meshed, the displacement between the members 16 and 32 is not smoothly performed. The presence of the balls 35, 35 surely prevents the peripheral surfaces from meshing with each other.

In the case of the clutch release device of the present invention constructed and operated as described above, since the arm piece 43 for fixing the piston 45 to the anvil 16 is provided only above the anvil 16, as described above, If the mounting direction of the clutch release device is appropriately selected so that the cylinder portion 28 of 24 and the bearing housing 23 provided in the casing 1 of the transmission are in mutually opposite positions, the outer peripheral portion of the anvil 16 and the above There is no interference with the bearing housing 23.

Further, the fitting portion between the cylinder hole 29 and the piston 45 is the guide tube 32.
Since it is largely deviated from the center of the, the anvil 16 does not rotate with respect to the guide tube 32 without providing a separate structure for preventing rotation.

Although not shown in FIGS. 1 and 2, the mounting portion 24 and the anvil 16 are shown.
A compression spring 50 (see FIGS. 5 and 6) having a relatively small elastic force is provided between the front end edge of the outer ring 41 and the diaphragm spring 42 during normal operation (when the clutch mechanism is connected). It is also possible to elastically contact and to prevent the generation of abnormal noise due to the collision between the members 41 and 42.

When the clutch release bearing 10 is mounted on the tip of the anvil 16, the inner ring 40 is fixed to the anvil 16 as shown in FIG. 1, and the inner ring 40 is also fixed as shown in FIG. 40 is loosely supported with respect to the anvil 16, and a spring 48 for self-alignment is provided to support the bearing 10 and the diaphragm spring.
It is also possible to configure the centers of 42 and 42 to automatically coincide with each other.

Next, FIG. 3 shows a second embodiment of the present invention.

In the case of this embodiment, the cylinder part provided at the upper end of the mounting part 24
The protrusion 28 is adapted to protrude only on the tip side of the mounting portion 24. In accordance with this, the shape of the arm piece 43 formed above the anvil 16 is also changed.

Other configurations and operations are the same as those in the above-described first embodiment, and therefore, the same reference numerals are given to the same parts,
A duplicate description will be omitted.

In each of the above-mentioned embodiments, the anvil 16 is inclined with respect to the guide cylinder 32 by providing a large number of balls 35, 35 between the outer peripheral surface of the guide cylinder 32 and the inner peripheral surface of the anvil 16. However, if a plurality of cylinders 28 are arranged around the guide tube 32 in a well-balanced manner so that the anvil 16 does not tilt with respect to the guide tube 32, the large number of balls 35, 35 May be omitted.

Further, by providing a plurality of cylinder portions 28 in this manner, the anvil 16
When the inclination of the guide tube is prevented, the guide tube 32 can be omitted.

(Effects of the Invention) Since the clutch release device of the present invention is configured and operates as described above, it is possible to reduce the outer diameter of the anvil while keeping the overall length of the device short, and the clutch release device can be used as a transmission. When it is mounted in the casing, it becomes difficult to be dimensionally restricted, and the degree of freedom in designing the transmission is increased.

Further, since the rotation prevention is performed between the cylinder portion provided on the holding body and the piston fixed to the anvil, it is not necessary to provide a special rotation prevention structure, and the structure of the clutch release device can be simplified.

[Brief description of drawings]

1 and 2 show a first embodiment of the present invention, FIG. 1 is a vertical side view, FIG. 2 is a view seen from the left side of FIG. 1, and FIG.
FIG. 4 is a vertical side view showing a second embodiment of the present invention, FIG. 4 is a vertical side view showing an example of a transmission incorporating a conventional clutch release device, and FIG. 5 is an example of a conventional clutch release device. FIG. 6 is a vertical sectional side view showing a clutch release device according to the prior invention. 1: Casing, 2: Input side rotating shaft, 3: Output side rotating shaft, 4a,
4b, 4c, 4d, 5a, 5b, 5c, 5d: Gear, 6a, 6b: Synchromesh, 7, 8: Gear, 9: Guide tube, 10: Clutch release bearing, 11: Cylinder, 12: Piston body, 13 : Anvil, 14:
Partition wall, 15: cylinder cylinder, 16: anvil, 17: inner peripheral surface, 17a:
Large diameter part, 17b: small diameter part, 17c: step part, 18: outer peripheral surface, 18a: large diameter part, 18b: small diameter part, 18c: step part, 19: space, 20: supply / discharge port, 21:
Supply / discharge passage, 22: rolling bearing, 23: bearing housing, 24: mounting part, 25: circular hole, 26: mounting flange, 27: circular hole, 28: cylinder part, 29: cylinder hole, 30: supply / discharge port, 31: oil hole, 32: guide tube, 33: gap, 34: cage, 35: ball, 36: first compression spring,
37: Collar part, 38: Second compression spring, 39: Step part, 40: Inner ring, 41:
Outer ring, 42: diaphragm spring, 43: arm piece, 44: screw, 45: piston, 46: circular hole, 47: packing, 48: spring, 49: differential gear, 50: compression spring.

Claims (3)

[Scope of utility model registration request] Claim: What is claimed is: 1. A guide body which surrounds an input side rotary shaft of a transmission, a mounting portion which is fixed to a part of a casing of the transmission, and a holding body to which the guide cylinder is fixed. A tubular anvil inserted in the guide tube of the body so as to be movable in the axial direction, a release bearing supported at one end of the anvil, and at least one provided on the mounting portion side of the holding body. A clutch release device comprising a plurality of cylinders and a piston fixed to an end of an arm piece projecting from the other end of the anvil toward an outer peripheral direction and fitted into the cylinder in an oil-tight manner. 2. The clutch release device according to claim 1, wherein a large number of rolling elements are interposed between the outer peripheral surface of the guide cylinder and the inner peripheral surface of the anvil. 3. A holding body having a mounting portion fixed to a part of a casing of the transmission in a state of surrounding an input side rotary shaft of the transmission, and an anvil movably provided in the axial direction. A release bearing supported at one end of the anvil, a plurality of cylinders provided at one end of the holding body, and an end of an arm piece projecting in the outer circumferential direction from the other end of the anvil. A clutch release device comprising a plurality of pistons, which are fixed and are oil-tightly fitted to the plurality of cylinders.