JPH1038760A - Parking torque load device - Google Patents

Abstract

(57) [Problem] To realize a parking torque load device for verifying the function of a parking mechanism in a transmission using a torque converter and a planetary gear with a simpler configuration. A shaft having one end connected to an output shaft of a transmission, a pinion fixed to the other end of the shaft,
A rack that is arranged to be meshable with the pinion and moves on a linear motion bearing in a direction perpendicular to the output shaft; and a rack that is moved in a direction perpendicular to the output shaft to engage the pinion and the rack according to the operation of the transmission. In addition, a drive mechanism for applying rotational torque to the transmission or releasing the engagement is provided.

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 checking the 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 an output shaft is fixed by a parking gear. In order to verify the function of the parking mechanism, for example, FIGS.
The parking torque load device shown in FIG. FIG. 3 is a conceptual diagram of the configuration of this device, and FIG. 4 is a conceptual diagram of the configuration of a drive mechanism.
This device is rotatably supported by a bearing 1, and is connected to one end of a transmission output shaft and a shaft 2 for transmitting parking torque, a rotating disk 3 fixed to the other end of the shaft 2, and a bearing 4. A swinging shaft 5 which is supported and is rotatable about the same axis as the rotating disk 3, and is provided at one end of the swinging shaft 5 so that the rotating disk 3 and the swinging shaft 5 can be freely connected and opened. 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 as a thrust generating device, and a rotary torque generating mechanism 7 for applying a rotary torque to the swing shaft 5.

The function verification of the parking mechanism is carried out as follows. The output shaft of the transmission is connected to the shaft 1, and the rotating disk 3 and the swing shaft 5 are connected by the brake 6. 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 or not the parking mechanism is normally assembled or whether or not the parking mechanism normally operates 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 oscillating shaft 5 by the brake 6 and applies a rotational torque to the parking torque load device. It is an essential condition that the shaft 5 and the shaft 5 are arranged on the same axis. In order to realize this, the configurations of the swing shaft 5 and the bearing 4 become complicated, and many parts are required. For this reason, there is a disadvantage that a high level of assembly skill is required and the cost is high.

The present invention has been made to solve the above-described problems, and has as its object to provide an inexpensive parking torque load device with a simple structure.

[0006]

SUMMARY OF THE INVENTION A parking torque load device according to the present invention is provided with a shaft having one end connected to an output shaft of a transmission, a pinion fixed to the other end of the shaft, and a meshable pinion. A rack that moves on a linear motion bearing in a direction perpendicular to the output shaft, and the rack is moved in a direction perpendicular to the output shaft, and the pinion and the rack are engaged according to the operation of the transmission to apply rotational torque to the transmission. And a drive mechanism for releasing the engagement. Further, the rack has no teeth at the center thereof, and is disengaged from the pinion at an intermediate portion of the movement range of the drive mechanism. Furthermore, the rack and the drive mechanism are configured to engage and disengage with the pinion by the second drive mechanism.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a parking torque load device according to the present invention will be described below with reference to the drawings. In the drawings, the same reference numerals are used for the same or corresponding parts as those of the conventional parking torque load device described with reference to FIG. 7, and the description of the overlapping functions and functions is omitted. Embodiment 1 FIG. FIG. 1 is a conceptual diagram for explaining a configuration of a drive mechanism in a parking torque load device according to the present invention. In the drawing, reference numeral 2 denotes a shaft rotatably supported by a bearing (not shown) and connecting one end to an output shaft of the transmission, 8 denotes a pinion fixed to the other end of the shaft 2, 9 denotes a driving mechanism, a rack 91, and a linear motion rolling. It comprises a bearing 92, a cylinder 93 and the like. The rack 91 is connected to the cylinder 93 and has a linear motion rolling bearing 9.
2 supports the rack 91 so as to perform a linear motion in a predetermined range. The center of the rack 91 has teeth removed so that the engagement between the pinion 8 and the rack 91 is released at the center of the movement 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. Therefore, it is necessary to release the engagement between the rack 91 and the pinion 8 except when a 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 while detecting the tooth tip position so as to correct the stop position of the pinion 8 so that the tooth tip of the rack 91 does not interfere with the tooth tip of the pinion 8. . Then, cylinder 93
Is moved at a low speed to a predetermined position to bring the rack 91 into contact with the tooth surface of the pinion 8. Thereafter, the input shaft of the transmission and the cylinder 93 are simultaneously driven at a low speed so that the tooth surfaces of the cylinder and the cylinder are securely engaged with each other. Load.

With the above-described configuration, although it is necessary to add a function of detecting the positions 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 mechanism may be used as long as the mechanism allows the rack 91 to move only in the direction perpendicular to the axis of the output shaft. For example, a mechanism configured to levitate the moving part on the track by fluid pressure, A sliding bearing using a self-lubricating member between the portion and the track may be used. The selection of these means may be made according to the permissible range of fluctuation of the rotational torque applied to the transmission caused by the frictional force in the moving part and the determination accuracy. Further, by increasing the moving stroke of the rack 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 with the teeth at the center removed. Needless to say.

Embodiment 2 FIG. In the first embodiment,
A rack is provided that has a pinion fixed to a shaft that is connected to the transmission output shaft and that moves horizontally to engage with the pinion only when parking torque is applied to the transmission, but when parking torque is applied to the transmission. Alternatively, the rack may be configured to approach and mesh with the pinion. FIG. 2 is a conceptual view of the configuration of the parking torque load device configured as described above. The driving mechanism 9 ′ includes a rack 94, a linear motion rolling bearing 95, a cylinder 96, etc., and is installed on a pedestal 10 that can move up and down. It 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 while detecting the tooth tip position so as to correct the stop position of the pinion 8 so that the tooth tip of the rack 91 does not interfere with the tooth tip of the pinion 8. . Next, the drive mechanism 9 ′ with the rack 94 stopped at a predetermined position raises the gantry 10, engages the pinion 8 with the rack 94, activates the parking pole of the transmission, and activates the cylinder 96.
Is driven at a predetermined pressure to apply a rotational torque to the transmission. Since the drive mechanism is moved up and down to engage the pinion 8 with the rack 94, the movement stroke of the drive mechanism can be smaller than that of the first embodiment. Further, when the pinion 8 and the rack 94 are engaged with each other, the interference between the tooth tip of the rack and the tooth tip of the pinion can be prevented only by correcting the stop position of the pinion, thereby facilitating the operation.

Although the description has been given of the case where the rack is installed on the gantry that moves up and down, the rack may be moved in the axial direction of the output shaft to engage the rack and the pinion. In order to smoothly engage the rack and the pinion, the ends of both teeth may be sharpened in the axial direction, or the rack may be moved in the axial direction on a slope.

[0013]

The parking torque load device according to the present invention has a shaft having one end connected to the output shaft of the transmission, a pinion fixed to the other end of the shaft, and a linear motion bearing arranged so as to mesh with the pinion. A rack that moves upward in a direction perpendicular to the output shaft, and this rack is moved in a direction perpendicular to the output shaft, and according to the operation of the transmission, the pinion and the rack are engaged to apply rotational torque to the transmission or to engage the transmission. Since the driving mechanism for canceling 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 has no teeth at the center thereof and is disengaged from the pinion at the middle of the range of movement by 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 released from the pinion by the second drive mechanism,
Further, a compact parking torque load device can be realized.

[Brief description of the drawings]

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

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

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

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

[Explanation of symbols]

2 axis 3 rotating disk 5 swing axis 6
Brake 7 Rotary torque generating mechanism 8 Pinion 9
Drive mechanism 10 Mount

Claims (3)

[Claims] 1. A shaft having one end connected to an output shaft of a transmission, a pinion fixed to the other end of the shaft,
A rack that is arranged to be able to mesh with the pinion and moves on a linear motion bearing in a direction orthogonal to the output shaft, and that the rack is moved in a direction orthogonal to the output shaft, and in accordance with the operation of the transmission, A parking torque load device comprising: a drive mechanism that meshes a pinion with the rack to apply a rotational torque to the transmission or cancels meshing. 2. The parking torque load device according to claim 1, wherein the rack has no teeth at a central portion thereof and releases engagement with the pinion at an intermediate portion of a movement 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 and disengage with the pinion by a second drive mechanism.