JPH09175349A - Parking mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact parking mechanism which can be accommodated in a small or a limited space. SOLUTION: A parking mechanism concerned comprises a detent lever 1 continued to the operation part, a parking gear 2, pole 3 meshing with the gear 2, cam-equipped rod 4 to push the pole 3, and the second rod 5 which couples the tail of the rod 4 with the detent lever 1 situated nearer the pole 3 than the rod tail in such a condition as folded back, wherein the tail of the rod 4 is guided by a guide 6 in the directions in which the cam 41 advances and retreats. Thereby the cam-equipped rod can make advancing and retreating operations with less oscillative swings while the rod length remains small.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parking mechanism, and more particularly to a parking mechanism for locking a shaft of an output shaft system of a power transmission to achieve a parking state of a vehicle.

[0002]

2. Description of the Related Art Conventionally, as a parking mechanism for achieving a parking state of a vehicle, there is a parking mechanism which stops a parking gear fixed to an appropriate shaft of an output shaft system of a power transmission device.
Such a parking mechanism is usually composed of a parking pole and a cam-equipped rod that engages and disengages the parking pole. The cam of the cam-equipped rod is placed between the rear surface of the parking pole and the reaction force supporting member by the driver's operation. The claws on the front surface of the parking pole are engaged with the rectangular teeth on the peripheral surface of the parking gear to prevent rotation. As a parking mechanism having such a configuration, Japanese Patent Laid-Open No. 3-157250
There is a technique disclosed in Japanese Patent Laid-Open Publication No. JP-A-2003-115, which adopts a structure in which a cam-equipped rod is directly rotatably connected to a detent lever.

[0003]

By the way, there is a demand for downsizing of a parking mechanism incorporated in a transmission device because of the problem of mounting the power transmission device on a vehicle. However, in the above-mentioned conventional type, the end portion of the cam-equipped rod connected to the detent lever swings due to the rotation of the detent lever, and this movement causes the gap between the parking pole and the reaction force support member. The rod is long in order to suppress the variation in the cam entry angle of the cam, and when looking at the advancing / retreating direction of the cam-equipped rod, the detent lever is located further at the rear end of the cam-equipped rod, so the parking mechanism is equipped with a cam. It becomes large in the direction in which the rod moves back and forth.

Therefore, according to the present invention, by suppressing the variation in the approach angle of the cam-equipped rod with respect to the parking pole while shortening the length of the cam-equipped rod, the cam-equipped rod can be accommodated in a small space or a space having a restricted shape.
It is an object of the present invention to provide a compact parking mechanism having a large degree of freedom in arrangement.

[0005]

To achieve the above object, the present invention is fixed to a detent lever that rotates in response to a driver's operation and an arbitrary shaft of an output shaft system of a power transmission device. A parking gear, a pawl that meshes with the parking gear, and a parking pole that is rotatably supported by an immovable member of the power transmission device, and a cam at one end. A first rod for advancing and retracting between the first and the second pole to rotate the parking pole, one end rotatably connected to the other end of the first rod, and the other end rotatably connected to the detent lever, A second rod arranged so as to overlap the first rod; and a guide for guiding the connecting portion of the first rod and the second rod in the advancing / retreating direction of the cam. Do

[0006]

According to the present invention, by guiding the connecting portion of the first rod and the second rod in the advancing / retreating direction of the cam by using the guide, the rocking of the other end of the first rod is prevented. Therefore, the length of the first rod can be shortened, and since the first rod and the second rod are arranged so as to overlap with each other, the detent lever can be attached to the first rod and the second rod. Since it can be arranged at any position closer to the parking pole than the connecting portion of the rod, the entire parking mechanism can be made compact and the degree of freedom of the disposition position of the detent lever can be increased.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. First, the schematic structure of the mechanism will be described.
As shown in the side view of FIG. 1 and the bottom view of FIG. 2, this parking mechanism is fixed to a detent lever 1 that rotates in response to a driver's operation and an arbitrary shaft of an output shaft system of a power transmission device described later. Parking gear 2 and a pawl 31 that meshes with the parking gear 2 and is rotatably supported by an immovable member of the power transmission device, and a cam 41 at one end.
And a first rod 4 for rotating the parking pole 3 by advancing and retracting the cam 41 between the parking pole 3 and the reaction force support member 61, and one end freely rotatable to the other end of the first rod 4. A second rod 5, which is rotatably connected to the detent lever 1 at the other end and is arranged to overlap the first rod 4, and a connection between the first rod 4 and the second rod 5. And a guide 6 for guiding the portion in the moving direction of the cam 41.

Hereinafter, each of the above parts will be sequentially described. The detent lever 1 has its tip end supported by a shaft hole of a boss 62 formed to project from the plate surface 60 of the guide 6, penetrates through a case wall of the power transmission device, and is led out of the case, and is operated by an appropriate link mechanism. It is a lever in the form of a chicken cob that is supported by a shaft 10 connected to the device to prevent rotation, and has a cam surface in which a plurality of notches 11 are formed on the circumferential surface of the arc portion of the chicken cob. Then, a detent spring 7 which is a leaf spring having a roller 71 that engages with the notch 11 of the cam surface is provided so as to be supported by a case of the power transmission device or the like.

The parking gear 2 has a rectangular tooth 21 formed on the peripheral surface, which meshes with the claw 31 of the parking pole 3, as shown in the drawing. Details of the parking gear 2 will be described later in connection with the power transmission device.

The parking pole 3 is rotatably supported by fixing one end thereof to a gear case or the like with a pin 33, and is biased by a torsion coil spring 32 in a direction to release the engagement with the parking gear 2 and an intermediate portion. The claws 31 are arranged so as to face the peripheral surface of the parking gear 2 from below, and the tips are arranged so as to face the pins 61 as reaction force supporting members integrally formed with the guide 6.

The first rod 4 has a cam 41 slidably fitted on the outer periphery thereof, and the other end bent from the fitting portion of the cam 41 into an L shape passes through a slit 63 of the guide 6. , And is connected to the second rod 5 on the opposite side across the guide 6. The cam 41 has a conical cam surface with two different inclinations, is biased in one direction by a compression coil spring 42 wound around the outer circumference of the rod 4, and has a collar 43 at the end.
Has been prevented by. The outer periphery of the cam 41 is slidably supported in a cylindrical guide hole 64 formed in the block portion of the guide 6, and therefore the first rod 4 is
One end is supported by the guide 6 via the cam 41, and the other end is directly supported by the guide 6 by the slit 63.

The second rod 5 is formed in a plate shape having connecting holes formed at both ends, and the bent end portion of the first rod 4 is fitted into the hole at one end to be rotatably connected to the rod 4. Is
The hole at the other end is fitted to a pin planted in the detent lever 1 and is rotatably connected to the detent lever 1.

As shown in detail in FIG. 3, the guide 6 includes a block portion having a cylindrical guide hole 64 for guiding the circumferential surface of the cam 41, a plate-shaped guide portion having a slit 63 connected to the block portion, and the block portion. Is on the opposite side across the block,
The parking pole 3 projects vertically from the mounting plate surface 60.
It has a stopper 65 for holding it at the rotational position in the retracting direction. A large-diameter pin 61 having an axis intersecting with the axis of the cylindrical guide hole 64 is further fitted to the guide 6, and the pin 61 functions as a reaction force supporting member for the cam 41.

The parking mechanism configured as described above is
It works as follows. That is, FIGS. 1 and 2 show a positional relationship in which the parking state is released. In this state, when the detent lever 1 is rotated clockwise in the drawing, the second rod 5 connected to the detent lever 1 is rotated. Is pulled to the left in the figure. By this operation, the first rod 4 is pushed to the left in the drawing, the cam 41 is guided by the cylindrical guide hole 64 on the outer peripheral surface, and the reaction force support pin 61 and the parking pole 3 are guided.
Go in between the tip of the. At the time of this approach operation, if the rectangular tooth position of the parking gear 2 is in a position where it interferes with the position of the claw 31 of the parking pole 3, or if the parking gear 2 is rotating at a certain speed or more due to inertia or the like, The cam 41 is prevented from entering, and only the first rod 4 advances further while compressing the spring 42, and stops at the end of the desired stalk. And the parking gear 2
If the tooth tip position no longer interferes with the position of the pawl 31 due to the rotation by a half pitch in the case where the number of teeth is the smallest, or the rotation is reduced to a certain speed or less, the cam 41 moves forward due to the accumulated spring load. , The parking pole 3 is rotated, and the claw 31 is engaged between the teeth 21 of the parking gear 2. This state is shown in FIG. 4, which will be described later, and the gentle conical surface of the cam 41 enters between the reaction force support pin 61 and the tip of the parking pole 3 to prevent the lock state from being released. Be done. Thus, the parking state of the vehicle by the parking mechanism is achieved.

The parking mechanism having the above-described structure can be applied to various power transmission devices and can be disposed at various portions. For example, FIG. 4 shows an end face in the axis transverse direction, and FIG. 5 shows an axially developed cross section. As described above, the power transmission device T in the drive device for an electric vehicle can be disposed in the case 90. In this embodiment, the power transmission device T is a combination of a differential gear D and a counter gear / speed reduction mechanism G that transmits the power of the motor M to the wheels. And in this example,
As shown in FIG. 4, the parking pole 3 is pinned and supported by a flange portion protruding from the case, and the parking gear 2 is a ring-shaped gear as shown in FIG. The guide 6 is fixed to one end surface of the gear 94 on the counter shaft 93 arranged between the ring gear 92 of the device D, and the guide 6 is fixed to the wall of the case 90 by bolts or the like. In this arrangement, since the parking mechanism has a short axial length in the operating direction, the parking mechanism can be arranged using the dead space of the gear case 90 that connects the motor M and the differential device D.

The counter gear mechanism G of this power transmission device T
Is a counter shaft 93 whose both ends are supported by a gear case 90 through bearings, a large-diameter gear 94 fixed to one end of the shaft and meshing with a motor shaft output gear 91, and the other end of the counter shaft 93. It is composed of a small-diameter gear 95 integrally formed. The differential device D is composed of a well-known bevel gear differential gear, a differential case 96 that accommodates the differential gear, and a ring gear 92 that is fixed to the case 96 and meshes with the gear 95. Both ends are supported by the gear case 90 via bearings. The differential gear inside the differential case 96 is connected to the left and right axles (not shown) via a universal joint.

Therefore, when the counter gear mechanism G of the power transmission device T is locked by the parking mechanism by stopping the counter shaft 93, all the shafts of the output shaft system including the counter shaft 93 are locked. As a result, even when torque is applied to the wheels on a slope or the like, the rotation of the axle is transmitted to the yoke shaft of the differential device D, the differential case 96, the ring gear 92, the small diameter gear 95, and the counter shaft 93, and the parking gear 2 , The parking pole 3, the cam 41, and the reaction force support pin 61 to be transmitted to the guide 6, and finally supported by the case 90. Thus, the parking state of the vehicle by the parking mechanism is achieved.

As described above in detail, in this parking mechanism, the guide portion 6 is used to guide the connecting portion of the first rod 4 and the second rod 5 in the advancing / retreating direction of the cam 41, whereby Since it is possible to prevent the swing of the other end of the rod 4, that is, the point at which a force in the direction of pushing the first rod 4 is applied, it is possible to perform the movement of the first rod 4 even if the length of the first rod 4 is shortened. It can be an upper linear motion. Moreover, since the first rod 4 and the second rod 5 are arranged so as to overlap in the direction of the parking pole 3 from their connecting portions, the detent lever 1 is arranged between the first rod 4 and the second rod 5. Since the parking mechanism can be arranged at any position closer to the parking pole 3 than the connecting portion, the entire parking mechanism can be made compact mainly in the axial direction, and the detent lever 1 can be arranged at the first rod 4 and the first rod 4. The angle formed by the axes of the two rods 5 can be freely set within a range from a parallel state to an acute angle up to a certain degree.

The present invention has been described above in detail based on the embodiment. However, the present invention is not limited to this embodiment, and various modifications may be made to the concrete constitution within the scope of the claims. can do. For example, regarding the relationship between the parking pole 3 and the approaching direction of the cam 41, the cam 41 can be arranged to enter the pole 3 in a direction orthogonal to the pole 3 as in the case of the conventional art.

[Brief description of the drawings]

FIG. 1 is a side view of a parking mechanism according to an embodiment of the present invention.

FIG. 2 is a bottom view of the parking mechanism.

FIG. 3 is a perspective view showing a guide portion of the parking mechanism.

FIG. 4 is a side view of a power transmission device provided with the parking mechanism.

FIG. 5 is an axially developed sectional view of a drive device for an electric vehicle including the power transmission device.

[Explanation of symbols]

 1 Detent Lever 2 Parking Gear 3 Parking Pole 4 First Rod 5 Second Rod 6 Guide 31 Claw 41 Cam 93 Output Shaft T Power Transmission Device

Claims (1)

[Claims] 1. A detent lever that rotates in response to a driver's operation, a parking gear fixed to an arbitrary shaft of an output shaft system of a power transmission device, and a claw that meshes with the parking gear. A parking pole rotatably supported by an immovable member of a transmission device, and a cam at one end, and the cam moves forward and backward between the parking pole and the reaction force support member to rotate the parking pole. A rod of which one end is rotatably connected to the other end of the first rod,
A second rod, the other end of which is rotatably connected to the detent lever and which is arranged so as to overlap the first rod, and a connecting portion of the first rod and the second rod that moves the cam forward and backward. A parking mechanism comprising: a guide that guides in a direction.