JPH0736185Y2 - Clutch device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a clutch device which is interposed between a driving rotary body and a driven rotary body located on the same axis to intermittently transmit power. .

2. Description of the Related Art Conventionally, as a clutch device of this type, a clutch body is spline-connected slidably along an outer peripheral portion of a driven rotary body in an axial direction, and the clutch body is engaged with an engaging portion of a drive rotary body. In general, the clutch body is provided with a cam body having a plurality of trapezoidal or corrugated cam claws radially and having a cam claw engaging with the cam claws. Then, by engaging the clutch body with the engaging portion, power is transmitted from the drive rotating body to the driven rotating body. Further, by blocking the rotation of the cam body, the clutch body is slid in the direction away from the drive rotor by utilizing the cam function of the engagement portion between the cam claws to engage the clutch body with the engagement portion. By releasing it, the power transmission from the driving rotary body to the driven rotary body is cut off.

Problems to be Solved by the Invention When the clutch is cut by cutting off the power transmission from the driving rotary body to the driven rotary body by using the cam function of the engagement part between the cam claws, the driven rotary body may be overrun. When it is still rotated, the cam claws are re-engaged with each other, so that the cut state of the clutch cannot be maintained. Therefore, as a means for continuously maintaining the cut state of the clutch, a means for holding the cam claws in a separated state after the cam claws are disengaged from each other so that the cam claws do not mesh again is necessary.

As such a holding means, as described in Japanese Patent Publication No. 58-39252, a circumferential groove is formed in the outer peripheral portion of the clutch body to engage the cam pawl of the clutch body with the cam pawl of the cam body. There is a device provided with a holding member that engages with the circumferential groove when the clutch body slides to the position where is released.

However, when a clutch device having a holding means composed of a circumferential groove and a holding member is provided in a power transmission path of a vehicle or the like, the driven side is rotated by the rotation of the wheels even in the clutch-cut state, and therefore the circumferential groove is rotated. And the holding member are easily worn. Due to this wear, the separated state of the cam claws is not maintained, and when the clutch is cut, the driven rotating body rotates while the cam claws slightly mesh with each other, and the cam claws repeatedly mesh with each other. It has the drawback of generating noise.

Means for Solving the Problems A driving rotating body and a driven rotating body are provided on the same axis, and a plurality of clutch claws are formed on one of these rotating bodies radially from the center of rotation, and the claw portion meshes with the clutch claws. The movable claw clutch formed with is urged to the other rotating body in the direction in which the clutch claw and the claw portion are engaged with each other, and spline-fitted. A floating claw body is rotatably fitted on the movable claw clutch to form a claw that meshes with a claw provided on the movable claw clutch on the floating claw body and at least one of these claws is an inclined claw. A locking pawl that fixes the rotation of the floating pawl is provided to engage the clutch pawl, and the top of the clutch pawl and the pawl are engaged when the tops of the pawls that have been disengaged when the floating pawl is rotationally fixed do not come into sliding contact with each other. The floating claw body is provided with a restricting claw for restricting the rotation of the clutch claw at a position where the claw of the clutch slides.

When shutting off the power transmission from the driving rotary body to the driven rotary body, first, the rotation of the floating pawl body is fixed by the locking pawl body. When the rotation of the floating claw body is fixed, the movable claw clutch slides in the direction to release the mesh between the claw of the floating claw body and the claw of the movable claw clutch, at least one of which is an inclined claw, and the claws are meshed with each other. It will be canceled. Also, the sliding of the movable claw clutch releases the engagement between the claw portion and the clutch claw, and the power transmission from the drive rotor to the driven rotor is interrupted. Furthermore, the rotation of the floating claw body also fixes the rotation of the clutch claw that meshes with the regulating claw of the floating claw body.At this time, the clutch claw has the top of the clutch claw when the claw tops are not in sliding contact with each other. The rotation is restricted at the position where the claw and the top of the claw are in sliding contact with each other. Therefore, even after the power transmission from the driving rotary body to the driven rotary body is cut off, even if the claws face each other so that they can mesh with each other, the movable claw clutch is engaged by sliding contact between the tops of the claws and the claws. The sliding movement of the claws is blocked, and the engagement between the claws is blocked.

Embodiment An embodiment of the present invention will be described with reference to the drawings. First,
A front wheel diff case 3 is pivotally supported by a front wheel receiver 2 fixed to the front part of the agricultural tractor 1 so as to be swingable left and right, and a wheel shaft case 4 and a fixed gear case 5 are sequentially connected and fixed to both left and right sides of the front wheel diff case 3. ing. Further, a rotating gear case 6 and a front wheel 7 are steerably connected to the fixed gear case 5.

A front wheel differential device 8 is installed in the front wheel differential case 3, and a pair of left and right output shafts 9 that are drive rotating bodies extend from the front wheel differential device 8. A transmission shaft 10, which is a driven rotating body, is pivotally supported in the wheel shaft case 4, and the transmission shaft 10 and the output shaft 9 are provided on the same axis.

Next, a flange portion 11 is formed on the outer end portion of the output shaft 9, and a plurality of clutch claws 12 are formed radially on the surface of the flange portion 11 facing the transmission shaft 10 from the center of rotation. . A movable claw clutch is provided on the outer periphery of the inner end of the transmission shaft 10.
13 is slidably spline-fitted, and the movable claw clutch 13 is formed with a claw portion 14 that engages with the clutch claw 12 in a disengageable manner. The movable claw clutch is moved in the direction in which the claw portion 14 and the clutch claw 12 are engaged with each other.
A spring 15 for urging 13 is provided on the outer peripheral portion of the transmission shaft 10. Further, an inclined pawl 16 which is a pawl is integrally fixed to the outer peripheral portion of the movable pawl clutch 13 by a spring pin 17, and a ring-shaped floating pawl 18 is rotatably fitted on the outer periphery of the movable pawl clutch 18. An inclined claw 19 that is a claw that meshes with the slanted claw 16 and a regulating claw 20 that meshes with the clutch claw 12 are formed on the.

Next, a lock claw body 21 is externally fitted to the outer circumferences of the inclined claw 16 and the floating claw body 18, and a claw portion 22 and a groove portion 23 are formed in the lock claw body 21. The claw portion 22 is provided so as to be capable of meshing with a fixed claw 24 fixed to the inner peripheral portion of the wheel shaft case 4, and the lock claw is in a direction in which the mesh between the fixed claw 24 and the claw portion 22 is released. A spring 25 for urging the body 21 is provided on the outer peripheral portions of the inclined pawl 16 and the floating pawl body 18. Further, the groove 23 is engaged with a connecting projection 26 protruding from the floating claw 18 in the outer peripheral direction.

In such a configuration, power is transmitted between the output shaft 9 and the transmission shaft 10 on the right side in FIG.
The power transmission between the left output shaft 9 and the transmission shaft 10 is cut off.

Here, when the agricultural tractor 1 is traveling in the four-wheel drive state, the engine (not shown) moves from the front wheel differential device 8 to the front wheel differential device 8.
The output shaft 9 rotates due to the power transmission to the clutch claw 12 and the movable claw clutch formed on the flange 11 of the output shaft 9.
The movable claw clutch 13 is rotated by meshing with the claw portion 14 formed on the front wheel 7, and the movable claw clutch 13 and the transmission shaft 10 are integrally rotated, so that the front wheel 7 is rotationally driven. In addition,
In the state where power is being transmitted from the output shaft 9 to the transmission shaft 10, the locking pawl 21 is moved outward by the urging force of the spring 25, as shown in FIG. 3 (a). As described above, the claw portion 22 and the fixed claw 24 are not meshed with each other. And the fourth
As shown in FIG. 7A, the free pawl 18 rotates integrally with the movable pawl clutch 13 and the transmission shaft 10 in the arrow A direction by the engagement of the inclined pawl 16 and the inclined pawl 19. Further, as shown in FIG. 3 (a), since the connecting projection 26 is engaged with the groove 23, the locking claw body 21 is also integrated with the floating claw body 18, the movable claw clutch 13 and the transmission shaft 10 by the arrow. Rotate in the B direction.

Next, a case where the power transmission to the wheels on the outer side in the turning direction is cut off in order to reduce the turning radius when turning the agricultural tractor 1 will be described. First, as shown in FIG. 3 (b), the locking claw body 21 is fixed by the operation of the clutch operating section (not shown) through the shifter fork (not shown).
Slide in the 24 direction (arrow B direction) to engage the claw portion 22 of the lock claw body 21 with the fixed claw 24. As a result, the rotation of the locking pawl 21 is stopped, and further, the rotation of the floating pawl 18 is stopped because the connecting projection 26 and the groove 23 are engaged with each other.
On the other hand, since the transmission shaft 10 and the movable claw clutch 13 connected to the front wheel 7 continue to rotate in the direction of arrow A,
As shown in FIG. 4 (b), the inclined claw 16 is a movable claw clutch 13
Together with the direction in which the engagement with the inclined claw 19 is released (arrow C
Direction), and the engagement between the inclined claw 16 and the inclined claw 19 is released.

Further, after the engagement between the inclined claw 16 and the inclined claw 19 is released, as shown in FIG. 4 (c), the floating claw body 18 remains fixed and the movable claw clutch 13 and the inclined claw integrated with the movable claw clutch 18 are fixed. 16 rotates in the direction of arrow A along the end surface of the inclined claw 19, and the clutch claw 12 also rotates in the direction of arrow A until it hits the regulating claw 20. Then, the clutch claw 12 hits the restriction claw 20 to prevent the clutch claw 12 from rotating, and the relative position of the clutch claw 12 with respect to the floating claw body 18 is fixed. That is, the clutch claw 12 with which the end surface of the claw portion 14 of the movable claw clutch 13 is in sliding contact.
The position of the end surface of the floating claw body 18 with which the end surface of the inclined claw 16 slides
The position of the end surface of the inclined claw 19 is regulated to be constant.

Therefore, the inclined claw 16 and the movable claw clutch 13 further rotate in the direction of arrow A from the state shown in FIG. 4 (c), and the end surface of the inclined claw 16 and the inclined claw 19 are moved as shown in FIG. 4 (d). When the slidable contact state with the end surface is released and the inclined claw 16 and the inclined claw 19 are brought into a state of meshing with each other by the biasing force of the spring 15, the end surface of the claw portion 14 is in sliding contact with the end surface of the clutch claw 12. Further, the engagement between the inclined claw 16 and the inclined claw 19 is prevented.
Further, as shown in FIG. 4 (c), when the end surface of the claw portion 14 and the end surface of the clutch claw 12 are not in sliding contact, the end surface of the inclined claw 16 and the end surface of the inclined claw 19 are in sliding contact. Further, the engagement between the inclined claw 16 and the inclined claw 19 is prevented. Therefore, when the power transmission is cut off, the inclined claws 16 and 19 are prevented from reengaging. The rotation of the left output shaft 9 is prevented by the engagement of the restricting pawl 20 with the clutch pawl 12, but the power transmission to the right output shaft 9 is continued by the front wheel differential device 8.

Next, a switching operation from the power transmission cutoff state to the power transmission state will be described. When the urging force that urges the lock claw body 21 toward the fixed claw 24 is released, the lock claw 21 slides in the direction away from the fixed claw 24 (arrow B'direction) by the urging force of the spring 25, The engagement between the claw portion 22 and the fixed claw 24 is released. For this reason, the floating pawl 18 is locked.
The rotation of the clutch claw 12 by the restriction claw 20 is released by allowing the claw 21 to freely rotate together with the restriction claw 21. And the fourth
As shown in FIG. (E), when the end surfaces of the inclined claw 16 and the inclined claw 19 and the end surface of the claw portion 14 and the end surface of the clutch claw 12 are not in sliding contact with each other, the spring 15 is attached. Due to the force, the movable claw clutch 13 and the inclined claw 16 output shaft 9
The slanted claw 16 and the slanted claw 19 are engaged with each other, the claw portion 14 and the clutch claw 12 are engaged with each other, and the output shaft 9
From the power transmission shaft 10 is restarted.

In the present embodiment, both claws 1 that mesh with each other are used.
Although 6 and 19 are inclined claws, one of these claws 16 and 19 may be a square claw.

Effect of the Invention According to this invention, the movable claw clutch is slid in the direction in which the engagement between the claws is released by fixing the rotation of the floating claw body as described above, so that the claw portion of the movable claw clutch and the clutch claw are engaged with each other. When releasing and cutting off the power transmission from the drive rotor to the driven rotor, the regulating pawls provided on the floating pawls regulate the rotation of the clutch pawls. When the clutch claws and the claws are not in sliding contact at the position where the claws and the claws are in sliding contact, it is possible to reliably prevent the claws from meshing with each other when the power transmission is cut off. This has the effect of preventing the generation of noise due to the repeated engagement of the claws when shutting off.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a vertical sectional front view, FIG. 2 is a sectional view taken along the line DD in FIG. 1, and FIG.
FIG. 4 is a development view showing a locking claw body and a fixed claw, FIG. 4 is a development view showing a meshing state of a floating claw body, and FIG. 5 is a front view showing the entire agricultural tractor. 9 ... Drive rotor, 10 ... Driven rotor, 12 ... Clutch claw, 13 ... Movable claw clutch, 14 ... Claw part, 16 ... Claw, 18
...... Floating claw body, 19 …… Claw, 20 …… Regulation claw, 21 …… Lock claw body

Claims (1)

[Scope of utility model registration request] 1. A driving rotary body and a driven rotary body are provided on the same axis, and a plurality of clutch pawls are formed radially on the driving rotary body or the driven rotary body from the center of rotation, and the pawls mesh with the clutch pawls. A movable claw clutch having a portion formed thereon is biased in the direction in which the clutch claw and the claw portion are meshed with each other by the spline-fitting to the driven rotor or the drive rotor, and the floating claw body is rotatable on the movable claw clutch. A locking claw body that is externally fitted to the movable claw clutch and that forms a claw that meshes with a claw provided on the movable claw clutch on the floating claw body and that at least one of these claws is an inclined claw to fix the rotation of the floating claw body. Provided,
When the tops of the claws that mesh with the clutch claws and the claws that have been released from the meshing state when the floating claws are rotationally fixed do not slide, the tops of the claws and the claws are slidably contacted with each other. A clutch device characterized in that a regulating claw for regulating rotation of the clutch claw is provided on the floating claw body.