JP3473239B2 - Parking mechanism - Google Patents

Description

Description: 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. . 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 usually includes a parking pole and a rod with a cam that engages and disengages the parking pole with a parking gear, and the cam of the rod with the cam is moved between the rear surface of the parking pole and the reaction force supporting member by a driver's operation. And the pawl on the front surface of the parking pole is engaged with the rectangular teeth on the peripheral surface of the parking gear to prevent rotation. Japanese Patent Laid-Open No. 3-157250 discloses a parking mechanism having such a configuration.
There is a technique disclosed in Japanese Patent Application Laid-Open Publication No. HEI 9-209, and in this technique, a configuration is employed in which a rod with a cam is directly rotatably connected to a detent lever. [0003] By the way, there is a demand for a compact parking mechanism incorporated in the power transmission device due to the problem of mounting the power transmission device on a vehicle. However, in the above-described conventional type, the end of the rod with the cam connected to the detent lever swings due to the rotation of the detent lever. The length of the rod is long in order to suppress the variation of the cam entry angle, and the detent lever is located at the rear end of the rod with the cam, so that the parking mechanism has a cam. It becomes large in the direction in which the rod moves. [0004] Therefore, the present invention suppresses the variation in the angle of entry of the cam-equipped rod with respect to the parking pole while shortening the length of the cam-equipped rod, so that it can be accommodated in a small space or a space having a restricted shape.
An object of the present invention is to provide a compact parking mechanism having a large degree of freedom in arrangement. [0005] In order to achieve the above object, the present invention provides a detent lever which rotates in response to a driver's operation, and an optional shaft of an output shaft system of a power transmission device. A parking pawl having a fixed parking gear, a pawl meshing with the parking gear, rotatably supported by a stationary member of the power transmission device, and a cam at one end; A first rod for moving the parking pole forward and backward between the force supporting member and 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 connected to the first rod and arranged so as to overlap the first rod; and a guide for guiding a connecting portion between the first rod and the second rod in a direction in which the cam moves. It is characterized by. According to the present invention, the connecting portion between the first rod and the second rod is guided by a guide in the advancing and retreating direction of the cam, whereby the other end of the first rod is swung. Since the first rod can be prevented from moving, the length of the first rod can be reduced, and since the first rod and the second rod are arranged to overlap each other, the detent lever can be moved to the first rod. Therefore, the parking mechanism can be arranged at an arbitrary position closer to the parking pole than the connecting portion of the second rod and the second rod, so that the entire parking mechanism can be made compact and the degree of freedom of the arrangement position of the detent lever can be increased. An embodiment 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 a side view in FIG. 1 and a bottom view in FIG. 2, the 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. A parking pawl 3 having a pawl 31 meshing with the parking gear 2 and rotatably supported by a stationary member of the power transmission device;
A first rod 4 for rotating the parking pawl 3 by moving the cam 41 between the parking pawl 3 and the reaction force supporting member 61, and one end rotatable to the other end of the first rod 4. , The other end being rotatably connected to the detent lever 1, and the second rod 5 arranged to overlap the first rod 4, and the connection between the first rod 4 and the second rod 5. And a guide 6 for guiding the section in the direction of movement of the cam 41. Hereinafter, each of the above components will be described one by one. The detent lever 1 is supported at a tip thereof by a shaft hole of a boss 62 formed so as to protrude from the plate surface 60 of the guide 6, penetrates through a case wall or the like of the power transmission device, is led out of the case, and is operated by an appropriate link mechanism. It is a cock-shaped lever which is supported by a shaft 10 connected to the apparatus and is provided with a cam surface having a plurality of notches 11 formed on the circumferential surface of the cock-shaped arc. A detent spring 7 composed of a leaf spring having a roller 71 that engages with the notch 11 on the cam surface is provided so as to be supported on a case or the like of the power transmission device. As shown in the figure, only the outer shape of the parking gear 2 is a gear having rectangular teeth 21 formed on the peripheral surface of the parking gear 3 for meshing with the pawls 31 of the parking pawl 3. The details of the parking gear 2 will be described later in connection with the power transmission device. The parking pawl 3 has one end fixed to a gear case or the like by a pin 33 and is rotatably supported. The parking pawl 3 is urged by a torsion coil spring 32 in a direction of releasing the engagement with the parking gear 2, and an intermediate portion is provided. Of the parking gear 2 from below, and the distal end thereof is arranged to face a pin 61 integrally formed with the guide 6 as a reaction force support member. The first rod 4 has a cam 41 slidably fitted on the outer periphery thereof, and the other end bent in an L shape from the fitting portion of the cam 41 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 is provided with a conical cam surface having two stages of different inclinations, is urged in one direction by a compression coil spring 42 wound around the outer periphery 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 by a cylindrical guide hole 64 formed in a block portion of the guide 6, and therefore, the first rod 4
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 connection holes formed at both ends. The bent end of the first rod 4 is fitted into one end of the second rod 5 and rotatably connected to the rod 4. And
The hole at the other end is fitted to a pin implanted in the detent lever 1 and rotatably connected to the detent lever 1. As shown in detail in FIG. 3, the guide 6 has a block portion having a cylindrical guide hole 64 for guiding the peripheral surface of the cam 41, a plate-like guide portion having a slit 63 connected thereto, and On the other side across the block,
Projecting vertically from the mounting plate surface 60, the parking pole 3
And a stopper 65 that holds the rotating position in the retracting direction. The guide 6 is further fitted with a large-diameter pin 61 having an axis intersecting the axis of the cylindrical guide hole 64, and this pin 61 functions as a reaction force support for the cam 41. The parking mechanism configured as described above has
It works as follows. That is, FIGS. 1 and 2 show the 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 leftward in the figure, and the cam 41 is guided on the outer peripheral surface by the cylindrical guide hole 64, and the reaction force support pin 61 and the parking pole 3
Go between the tip of the. At the time of this approaching operation, when the position of the rectangular teeth of the parking gear 2 interferes with the position of the pawl 31 of the parking pole 3 or when the parking gear 2 is rotating at a certain speed or higher 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 when the desired stalk has been completed. And parking gear 2
When the rotation is reduced by a half pitch or the rotation is reduced to a certain speed or less so that the tooth tip position does not interfere with the position of the pawl 31, the cam 41 performs the entering operation due to the accumulated spring load. Then, the parking pawl 3 is rotated, and the pawl 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 gently inclined conical surface of the cam 41 enters the state between the reaction force support pin 61 and the tip of the parking pole 3, and the release of the locked state is prevented. It is. Thus, the parking state of the vehicle by the parking mechanism is achieved. The parking mechanism having the above structure can be applied to various power transmission devices and can be disposed at various locations. For example, FIG. 4 shows an end face in a direction transverse to the axis, and FIG. As described above, the power transmission device T in the electric vehicle drive device can be disposed in the case 90. In this embodiment, the power transmission device T is a combination of a counter gear and reduction mechanism G for transmitting the power of the motor M to the wheels and a differential device D. And in this example,
As shown in FIG. 4, the parking pawl 3 is pinned and supported by a flange projecting 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 a gear 94 on a counter shaft 93 disposed between the ring gear 92 of the device D and the guide 6 and is fixed to a wall of the case 90 by bolting or the like. In this arrangement, since the parking mechanism has a short axial length in the operation direction, the parking mechanism can be arranged using the dead space of the gear case 90 connecting the motor M and the differential device D. The counter gear mechanism G of the power transmission device T
A counter shaft 93 having both ends supported by a gear case 90 via bearings; a large-diameter gear 94 fixed to one end of the shaft and meshing with a motor shaft output gear 91; And a small-diameter gear 95 formed integrally. The differential device D includes a differential gear made of a well-known bevel gear, a differential case 96 for housing the differential gear D, and a ring gear 92 fixed to the case 96 and meshing with the gear 95. Both ends are supported by the gear case 90 via bearings. The differential gear in the differential case 96 is connected to 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 without rotating the counter shaft 93, all the shafts of the output shaft system including the counter shaft 93 are locked. Thus, even when a rotational force 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 further to the parking gear 2 The driving force is transmitted to the guide 6 via the parking pole 3, the cam 41, and the reaction force support pin 61, and is finally supported by the case 90. Thus, the parking state of the vehicle by the parking mechanism is achieved. As described in detail above, this parking mechanism guides the connecting portion between the first rod 4 and the second rod 5 using the guide 6 in the direction in which the cam 41 moves forward and backward. Since the swing of the other end of the rod 4, that is, the point at which the force in the direction of pushing the first rod 4 is applied can be prevented, the movement of the rod can be performed even if the length of the first rod 4 is shortened. It can be an upper linear motion. Further, since the first rod 4 and the second rod 5 are arranged so as to overlap from the connecting portion thereof toward the parking pole 3, the detent lever 1 is connected to the first rod 4 and the second rod 5. It can be arranged at an arbitrary position on the side of the parking pole 3 with respect to the connecting portion, so that the entire parking mechanism can be made compact mainly in the axial direction, and the arrangement position of the detent lever 1 can be adjusted by the first rod 4 The angle between the axes of the two rods 5 can be freely set within a range from a parallel state to an acute angle to some extent. As described above, the present invention has been described in detail based on the embodiment. However, the present invention is not limited to this embodiment, and various concrete configurations are changed within the scope of the claims. can do. For example, as for the relationship between the parking pole 3 and the approach direction of the cam 41, the cam 41 can be arranged to enter the pole 3 in a direction perpendicular to the pole 3, as in 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 expanded sectional view of an electric vehicle drive device including the power transmission device. [Description of Signs] 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

────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-62-110550 (JP, A) JP-A-3-157250 (JP, A) JP-A-3-200458 (JP, A) JP-A-7-110 144616 (JP, A) Japanese Utility Model Showa 62-81123 (JP, U) Japanese Utility Model Showa 62-121158 (JP, U) Japanese Utility Model Utility Model 5-96627 (JP, U) Japanese Utility Model Showa 64-35166 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B60T 1/06 F16H 63/34

Claims (1)

(57) [Claim 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 the parking gear A parking pawl rotatably supported by an immovable member of the power transmission device; and a cam at one end, the cam being advanced and retracted between the parking pawl and the reaction force supporting member. A first rod for rotating the parking pole; one end rotatably connected to the other end of the first rod;
A second rod rotatably connected to the detent lever at the other end thereof, and a second rod disposed so as to overlap the first rod; and a connecting portion between the first rod and the second rod, which moves the cam forward and backward. A parking mechanism, comprising: a guide for guiding in a direction.