JP3414136B2 - Parking torque load device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parking torque load device used for confirming a function of a parking mechanism in an automatic transmission for an internal combustion engine (hereinafter referred to as a transmission).

[0002]

2. Description of the Related Art In a transmission using a torque converter and a planetary gear, there is a parking mechanism in which its output shaft is fixed by a parking gear. To verify the functioning of the parking mechanism, for example, FIGS.
There is a parking torque load device shown in. FIG. 3 is a conceptual diagram of the configuration of this apparatus, and FIG. 4 is a conceptual diagram of the configuration of a drive mechanism.
This device is rotatably supported by a bearing 1, and has a shaft 2 which connects one end with an output shaft of a transmission and transmits a parking torque, a rotary disc 3 fixed to the other end of the shaft 2, and a bearing 4. A swing shaft 5 that is supported and is rotatable about the same axis as the rotary disc 3, and is provided at one end of the swing shaft 5 so that the rotary disc 3 and the swing shaft 5 can be connected and released freely. A pair of brakes 6 and a lever 7 provided at the other end of the swing shaft 5
1 and a hydraulic cylinder 72, which is a thrust generator, and a rotating torque generating mechanism 7 for applying a rotating torque to the swing shaft 5.

The functional verification of the parking mechanism is carried out as follows. The output shaft of the transmission is connected to the shaft 1, and the brake 6 connects the rotating disk 3 and the swing shaft 5. In this state, the rotation torque generating mechanism 7 is operated to apply a predetermined rotation torque to the output shaft of the transmission. Whether the parking mechanism is normally assembled or normally operated is determined based on the relationship between the rotation angle of the output shaft and the rotation torque applied by the rotation torque generating mechanism 7.

[0004]

As described above, the conventional parking torque load device connects the shaft 1 and the rocking shaft 5 by the brake 6 and applies the rotational torque to the shaft 1. It is indispensable to arrange the shaft 5 and the shaft 5 on the same axis, and in order to realize this, the structure of the swing shaft 5 and the bearing 4 becomes complicated and a large number of parts are required. Therefore, there is a drawback that it requires a high degree of assembly skill and becomes expensive.

The present invention has been made to solve the above problems, and an object thereof is to provide an inexpensive parking torque load device having a simple structure.

[0006]

A parking torque load device according to the present invention has a shaft whose one end is connected to an output shaft of a transmission, a pinion fixed to the other end of the shaft, and a pinion which is meshable with the pinion. A rack that moves on the linear motion bearing in the direction orthogonal to the output shaft and this rack moves in the direction orthogonal to the output shaft, and the pinion and rack mesh with each other according to the operation of the transmission to apply a rotational torque to the transmission. And a drive mechanism for releasing the mesh. Further, the rack does not have teeth in the center thereof, and the meshing with the pinion is released in the middle of the moving range of the drive mechanism. Furthermore, the rack and the drive mechanism are configured such that the second drive mechanism engages and disengages the pinion.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a parking torque load device according to the present invention will be described below with reference to the drawings. The reference numerals used in each drawing are the same as or equivalent to those of the conventional parking torque load device described with reference to FIG. 7, and the description of overlapping functions and actions is omitted. Embodiment 1. FIG. 1 is a conceptual diagram for explaining the configuration of a drive mechanism in a parking torque load device according to the present invention. In the figure, 2 is a shaft that is rotatably supported by a bearing (not shown) and connects one end to the output shaft of the transmission, 8 is a pinion fixed to the other end of the shaft 2, 9 is a drive mechanism, and a rack 91, a linear motion rolling device. The bearing 92, the cylinder 93 and the like are included. The rack 91 is connected to the cylinder 93, and the linear motion rolling bearing 9
2 supports the rack 91 for linear movement within a predetermined range. Incidentally, teeth are removed from the central portion of the rack 91 so that the engagement between the pinion 8 and the rack 91 is released at the center of the moving stroke of the rack. Normally, the function verification of the parking mechanism is performed as part of the inspection of the finished product of the transmission, so that the rack 91 and the pinion 8 need to be disengaged from each other except when the parking torque is applied.

Next, the operation will be described. Prior to applying the parking torque, first, the input shaft of the transmission is driven at a low speed and the stop position of the pinion 8 is corrected while detecting the tooth tip position so that the tooth tip of the rack 91 and the tooth tip of the pinion 8 do not interfere with each other. . Then, the Cylinder 93
Is driven at a low speed to move it to a predetermined position to bring the rack 91 into contact with the tooth surface of the pinion 8. After that, the input shaft of the transmission and the cylinder 93 are driven at a low speed at the same time to surely mesh the tooth surfaces of both, and then the parking pole of the transmission is operated to drive the cylinder 93 with a predetermined pressure to rotate the transmission torque. To load.

With the above construction, although it is necessary to add the function of detecting each position of the pinion and the rack connected to the output shaft, the parking torque load device can be realized at a low cost with a simple mechanism. In the above description, the rack 91
Is supported by the linear motion rolling bearing 92,
Any supporting system may be used as long as it is a mechanism that can move the rack 91 only in a direction orthogonal to the axis of the output shaft. For example, a structure in which the moving portion is floated on the track by fluid pressure, A sliding bearing using a self-lubricating member between the portion and the race may be used. These means may be selected according to the allowable range of fluctuation of the rotational torque applied to the transmission generated by the frictional force in the moving part and the determination accuracy. Furthermore, if the rack movement stroke is increased so that the rack is retracted to a position where it does not interfere with the pinion 8 except when the parking torque is applied, it is not necessary to use the one without the central teeth. Needless to say.

Embodiment 2. In the first embodiment,
A pinion is fixed to the shaft that is connected to the output shaft of the transmission, and a rack is provided that moves horizontally and meshes with the pinion only when the parking torque is applied to the transmission, but when the parking torque is applied to the transmission. Alternatively, the rack may be brought close to the pinion to be engaged with each other. FIG. 2 is a conceptual diagram of the configuration of the parking torque load device configured as described above. The drive mechanism 9 ′ is composed of a rack 94, a linear motion rolling bearing 95, a cylinder 96, etc. There is.

Next, the operation will be described. Prior to applying the parking torque, first, the input shaft of the transmission is driven at a low speed and the stop position of the pinion 8 is corrected while detecting the tooth tip position so that the tooth tip of the rack 91 and the tooth tip of the pinion 8 do not interfere with each other. . Then, the drive mechanism 9 ′ with the rack 94 stationary at a predetermined position raises the gantry 10 to engage the pinion 8 and the rack 94, and the parking pole of the transmission is operated to operate the cylinder 96.
Is driven at a predetermined pressure to apply a rotational torque to the transmission. Since the pinion 8 and the rack 94 are engaged with each other by raising and lowering the drive mechanism, the movement stroke of the drive mechanism can be made smaller than that of the first embodiment. Further, when the pinion 8 and the rack 94 are meshed with each other, interference between the tooth tips of the rack and the tooth tips of the pinion can be prevented only by correcting the stop position of the pinion, which facilitates the operation.

Although the rack is installed on the pedestal that moves up and down, the rack may be moved in the axial direction of the output shaft so that the rack and the pinion engage with each other. In order to smoothly engage the rack and the pinion, the tooth ends of the two may be sharpened in the axial direction, or the rack may be moved in the axial direction on an inclined surface.

[0013]

The parking torque load device according to the present invention has a shaft whose one end is connected to the output shaft of the transmission, a pinion fixed to the other end of the shaft, and a linear motion bearing which is arranged so as to be able to mesh with the pinion. A rack that moves upward in the direction orthogonal to the output shaft and a rack that moves in the direction orthogonal to the output shaft are engaged with each other to apply rotational torque to or mesh with the pinion and rack according to the operation of the transmission. Since the driving mechanism for releasing the parking torque is provided, the parking torque load device can be realized at a low cost with a simple mechanism.

Further, since the rack does not have teeth at the center thereof and the engagement with the pinion is released at the middle portion of the moving range of the drive mechanism, a smaller parking torque load device can be realized. Furthermore, since the rack and the drive mechanism are configured to be engaged with and disengaged from the pinion by the second drive mechanism,
Furthermore, a compact parking torque load device can be realized.

[Brief description of drawings]

FIG. 1 is a structural conceptual diagram showing an embodiment of a parking torque load device according to the present invention.

FIG. 2 is a structural conceptual view showing another embodiment of the parking torque load device according to the present invention.

FIG. 3 is a conceptual diagram of a configuration of a conventional parking torque load device.

FIG. 4 is a conceptual diagram showing the configuration of a drive mechanism in a conventional parking torque load device.

[Explanation of symbols]

2 axis 3 rotating disk 5 swing axis 6
Brake 7 Rotational torque generation mechanism 8 Pinion 9
Drive mechanism 10 stand

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Claims (3)

(57) [Claims] 1. A shaft having one end connected to an output shaft of a transmission, and a pinion fixed to the other end of the shaft,
A rack which is arranged so as to be capable of meshing with the pinion and moves on a linear motion bearing in a direction orthogonal to the output shaft, and a rack which is moved in a direction orthogonal to the output shaft, and which corresponds to the operation of the transmission, A parking torque load device comprising: a drive mechanism for engaging a pinion and the rack with each other to apply a rotational torque to the transmission or release the engagement. 2. The parking torque load device according to claim 1, wherein the rack has no teeth at its center portion and is disengaged from the pinion at an intermediate portion of a moving range of the drive mechanism. 3. The parking torque load device according to claim 1, wherein the rack and the drive mechanism are configured to engage with and disengage from the pinion by a second drive mechanism.