JPH05116540A - Parking gear for electric car - Google Patents

Abstract

PURPOSE:To provide a parking gear for an electric car which uses an inboard drive unit. CONSTITUTION:In an electric car which uses a motor 3 placed on the chassis as a drive unit, a parking gear 11 is formed in a rotary shaft 30 which is coaxial with the rotor shaft 1 of the motor 3 and an engaging means 12 is provided which is movably supported to the supporting member 2 of the motor 3 and which engages with and disengages from the parking gear 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parking device for an electric vehicle, and more particularly to a parking device for an electric vehicle using an inboard type drive device having a motor mounted on a chassis of the vehicle.

[0002]

2. Description of the Related Art Electric vehicles have attracted attention from the viewpoint of pollution prevention to prevent air pollution due to exhaust gas, and various development studies have been conducted. Various types of drive systems for electric vehicles have been studied. Among them, the in-board drive system in which the drive system is mounted on the chassis and connected to the wheels by a constant velocity joint has a simple structure Since it can follow the same structure as the vehicle equipped with the internal combustion engine, it is highly likely to be put to practical use in a short period of time.

[0003]

By the way, in an electric vehicle using the above-mentioned drive device of the inboard type, since the drive shaft portion connected to the axle does not have an appropriate brake installation portion, the wheel brake is used as the parking brake. In reality, it is not necessary to provide a separate parking brake that directly fixes the drive shaft portion.

In view of such circumstances, the present invention utilizes the space between the motor of the drive unit and the supporting member thereof to arrange the electric vehicle parking without increasing the size for installation. The purpose is to provide a device.

[0005]

In order to solve the above-mentioned problems, the present invention is directed to an electric vehicle using a motor mounted on a chassis as a driving device, and the motor is formed on a rotary shaft concentric with the rotor shaft of the motor. And a meshing means that is movably supported by a supporting member of the motor and engages with and disengages from the parking gear.

[0006]

In the present invention having such a structure, a parking gear is formed on a rotating shaft concentric with the rotor shaft of the motor, and the meshing means movably supported by the supporting member of the motor is disengaged therefrom. Since it is configured to be provided, it is possible to provide a parking device for an electric vehicle that can be arranged without increasing the size for installation.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An electric vehicle parking apparatus of the present invention will be described below with reference to the embodiments shown in the drawings. FIG. 1 shows a cross section of a drive device to which it is applied (since the drive device of this embodiment is configured substantially symmetrically, the description of either one will be substituted for the other). In this example, the parking device 1 is of a type in which the rotor shaft 31 of the left and right wheel drive motor 3 housed in the common case 2 is fixed to the case 2.

First, a schematic structure of the entire driving device will be described. The motor 3 is housed in a cylindrical case 2 that constitutes a supporting member thereof, the stator 32 has its core portion fixed to the peripheral wall of the case 2, and the rotor shaft 31 has a rotary shaft 30 to which it is spline-engaged. One end is supported by the partition wall of the case 2 and the other end is supported by the output shaft of the speed reducer 4 including a planetary gear. The speed reducer 4 includes the rotating shaft 3
0 and a sun gear 41, a pinion gear 42 that meshes with the sun gear 41, a ring gear 43 that internally meshes with the pinion gear 42, and a carrier 44 that supports the pinion gear 42. The ring gear 43 is fixed to the case 2, and the carrier 44 is The case 2 is supported by an integral output shaft. The output shaft has a constant velocity joint 5 connected to the axle.
Are fitted and connected. The phase sensor 6 and the oil circulation device 7 are also connected to the rotor shaft 31 via a gear fixed to the rotor shaft 31.

FIG. 2 is an enlarged view of the II-II section of FIG. The parking device 1 includes a parking gear 11 integrated with a rotor shaft 31 and its teeth 111 (shown by solid lines in the figure).
The pawl with a claw 12 that constitutes a meshing means that meshes with the. The claw pole 12 has a pole shaft 1 at its middle portion.
It is rotatably supported by the case 2 via the shaft 3, and has a bent shape in which a pawl 121 is formed at an end facing the parking gear 11 and a cam engaging surface 122 is formed at an end on the opposite side. The cam 14 that cooperates with the pawl 12 has a rod 1
5 is slidably fitted in and is abutted against the large diameter rod tip portion 151 by receiving the spring load of the coil spring 16 on the back. The rod 15 is slidably supported by a bracket 21 fixed to the case 2 with a rod tip end 151 directed toward the case 2, and the rod rear end 152 is connected through a connecting mechanism such as a chicken-crown-like parking lever well known in an automatic transmission. Connected to the shift lever. The bracket 2
A cam surface that cooperates with the cam surface of the cam 14 is formed on the outer end side of 1, and the pawl pole 12 is provided with a torsion spring 17 whose base end side is bolted to the case. Has been granted.

In the parking device constructed as described above, when the parking device is operated, the rod rear end portion 152 is pressed by the operation of the shift lever (not shown) through the connecting mechanism. By this operation, the rod 15 is pushed into the case, and when the cam 14 rides on the cam surface of the bracket 21 in due course, the cam 14 is pushed by the cam engaging surface 12 of the pawl pole 12.
2 is pushed up, as a result, the pawl 12 with the pawl rotates around the pole shaft 13, and the pawl 121 has the pawl 121.
It is pressed against the outer circumference of 1. At this time, when the pawl 121 is pressed between the teeth of the parking gear 11, the pawl 1 remains as it is.
Reference numeral 21 meshes with the teeth of the parking gear 11, and when pressed against the tooth peaks, the cam 14 secures a clearance on the rod 15 against the spring load of the coil spring and escapes for the rod stroke.

FIG. 3 is a sectional view showing a driving device of a second embodiment to which the parking device of the present invention is applied. In this example, a rotary shaft which is the same as the driving device of the first embodiment and which opposes to the left and right sides. The parking device 1 is arranged at the ends of 30a and 30b. Only the differences from the first embodiment will be described below. At least one of the teeth 111 of the left and right parking gears 11a and 11b is 1 as shown by the two-dot chain line in FIG.
It is configured to have missing teeth at every tooth, and the pawl pole 12
The width of the claw 121 of the two parking gears 11a, 1
The width is such that it can be meshed with 1b at the same time.

In this example, the phase shift of the teeth between the pawl 121 and the two parking gears 11a and 11b during the parking operation becomes a problem, but in the above configuration, the teeth 111 of any one of the parking gears are alternate. Since the tooth is missing, a common trough can be secured in which the claw 121 can always fall regardless of how the phase shift of the tooth occurs, and this problem is solved.

FIG. 4 is a sectional view showing a drive unit of a third embodiment to which the present invention is applied. In this example, a parking unit is arranged on a rotor shaft of the drive unit which is slightly different from the above two examples. There is. Since the configuration and operation of the parking device are the same as those in the above example, the configuration of the drive device will be described below.

In this example, the motor 3A for driving the left and right drive shafts is housed in a cylindrical case 2A, and the stator 32A has its core portion fixed to the peripheral wall of the case 2A.
The base end side of the rotor shaft 31A is supported by the inner end of an annular flange extending inward from the end wall of the case 2A. A sun gear 41A of a reduction gear composed of a planetary gear is integrally formed at one end of the rotor shaft 31A, and a parking gear 11A of the parking device 1A is integrally formed at the other end. The speed reducer 4A includes the sun gear 41A, a pinion gear 42A that meshes with the sun gear 41A, a ring gear 43A that internally meshes with the pinion gear 42A, and a carrier 44A that supports the pinion gear 42A. The ring gear 43A is fixed to the case 2A and a carrier 44A. Is supported by the rotor shaft 31A through a differential case integrated with the rotor. The differential device 8 has a normal structure, and one differential gear 81 thereof has a constant velocity joint 5 connected to one axle.
A differential gear 82, which is connected and fixed to A, is connected to the rotor shaft 31.
It is fixedly connected to a constant velocity joint 5B which is continuous with the other axle extending from the opposite end side of the case 2A through the hollow hole of A. The phase sensor 6A is also connected to the rotor shaft 31A via a gear fixed to the rotor shaft 31A.

Although the present invention has been described in detail based on the three embodiments, the specific configurations of the respective parts can be appropriately modified within the scope of the claims. For example, in the second embodiment, the claws 121 of the claw pole 12 can be moved separately with respect to the claw pole 12 as left and right bodies, and in that case, the toothless structure of the parking gear 11 is unnecessary.
Further, by disposing the parking device on the motor output shaft, the torque corresponding to the gear ratio by the reduction gear device is reduced, and a design advantageous in strength is possible.

[Brief description of drawings]

FIG. 1 is a sectional view of a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view of a second embodiment of the present invention.

FIG. 4 is a sectional view of a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Parking device 2,2A Case (supporting member) 3,3A Motor 11,11A Parking gear 12,12A Claw pole (meshing means) 30,30a, 30b Rotating shaft 31,31A Rotor shaft

[Procedure amendment]

[Submission date] November 12, 1991

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

Claims (1)

[Claims] 1. An electric vehicle using a motor mounted on a chassis as a drive device, and movably supported by a parking gear formed on a rotating shaft concentric with a rotor shaft of the motor and a supporting member of the motor. And a meshing means for engaging and disengaging with the parking gear.