JP2595350Y2 - Transmission operation booster 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 booster device for operating a transmission, and more particularly to a method of supporting a spring disposed between an input shaft side and an output shaft side thereof.

[0002]

2. Description of the Related Art FIG. 4 is a schematic perspective view showing a main part of a conventional transmission operating device. In the figure, reference numeral 1 denotes a shift and select shaft, which operates in the direction A to select operation, and
The shift operation is performed by turning in the direction. The shift and select shaft 1 includes a change lever 2
Are connected via a link mechanism so as to be able to operate in the axial direction A in response to the above operation. Further, a shift member 3 is fixed to the shift and select shaft 1, and an engaging portion 4 that can selectively engage with the shift member 3 and a shift corresponding to a gear of a predetermined speed are provided. A plurality of sets of shift rods 6 including forks 5 are provided, and are configured to perform a select operation by selectively engaging them.

The change lever 2 is connected to the input shaft side of a booster device 7 for boosting using pressure air, which will be described later, and is configured to perform a shift operation via an output shaft 8 of the booster device 7. ing. That is, when the output shaft 8 operates in the axial direction C, the shift and select shaft 1
Rotates in the direction B to move the already selected shift rod 6 to D.
The shift operation is performed by operating in the direction. The output shaft 8 of the booster device 7 is disposed orthogonal to the shift and select shaft 1 and is connected to the end of the shift and select shaft 1 via first and second connecting rods 9 and 10. The shift and select shaft 1 is given a degree of freedom in the direction A by being rotatably connected to each other about the pin 11.

FIGS. 2 and 3 show a specific example of a conventional booster device 7. FIG. 2 is a longitudinal sectional view showing the whole, and FIG. 3 is an enlarged longitudinal sectional view showing a main part thereof. In the figure, 12
Is a connecting member connected to the change lever 2 side, and is connected to the input shaft 14 via the slide block 13. The input shaft 14 is provided inside the hollow portion of the output shaft 8 slidably supported by the booster body 15 so as to be relatively movable. A known lever mechanism 17 that operates a control valve 16 for supplying pressurized air is linked to the other end of the input shaft 14. The lever mechanism 17 controls the opening and closing of the control valve 16 in accordance with the relative movement between the input shaft 14 and the output shaft 8,
Pressure air is supplied to pressure chambers 19 and 20 formed on both sides of a piston member 18 attached to the outer peripheral surface of the output shaft 8. Reference numerals 21 and 22 denote supply paths for the compressed air. Further, between the input shaft 14 and the output shaft 8, as shown in FIG.
Spring 26, 27 for return is arranged between 3, 3 and receiving part 25 of output shaft 8 side.

In the conventional booster device 7, when the input shaft 14 is actuated by the change lever 2, while the drag acting on the output shaft 8 is small, the input shaft 14 is resilient by the spring 26 or 27. 14 and the output shaft 8 operate integrally. In this case, since no relative movement occurs between the input shaft 14 and the output shaft 8, the control valve is not actuated and the boosting effect does not work, as is known. When the drag from the shift and select shaft 1 side with respect to the output shaft 8 becomes large, the output shaft 8 does not move until the drag is overcome, and the spring 26 or 27 is compressed, whereby the input shaft 14 and the output shaft 8 are connected. Will cause relative movement between the two. When this relative movement occurs, one of the control valves 16 is opened via the lever mechanism 17 due to the relative movement, and pressurized air is supplied to the pressure chamber 19 or 20 via the supply path 21 or 22. As a result, the output shaft 8 is urged by the pressurized air acting on the piston member 18 to receive a boosting effect, thereby facilitating the shift operation. In this case, a part of the pressurized air is
Alternatively, it also flows into the portion 24 and exerts pressure on the input shaft via the receiving portion 23 or 24. Thereby, the reaction force of the boosting action on the output shaft 8 is transmitted to the change lever 2 so that the driver can sense the boosting action.

When the shift operation is completed, the input shaft 14
This time, relative movement in the opposite direction occurs between the pressure shaft and the output shaft 8 due to the resilience of the pressurized air or the spring 26 or 27, and eventually returns to a neutral state as a relative relationship between the two. As a result, since the relative movement between the input shaft 14 and the output shaft 8 is eliminated, the control valve 16 is closed via the lever mechanism 17, and the boosting action is stopped. The input shaft 14 and the output shaft 8 in the neutral state
The action of preventing relative movement between
It depends on 6,27.

[0007]

By the way, the springs 26 and 27 in the prior art are not operated, that is, in a neutral state in which the relative relationship between the input shaft 14 and the output shaft 8 is in the neutral state. 27 are arranged directly between the receiving portions 23 and 24 on the input shaft 14 side and the receiving portion 25 on the output shaft 8 side so that 27 is balanced. For this reason, the degree of freedom of the relative movement during the non-operation is large, so that the play at the time of non-operation of the change lever 2 is increased, and there is a problem that stability is poor. The present invention has been made in order to solve such a problem of the related art, and an object of the present invention is to provide a transmission operation booster device having improved stability when the change lever is not operated. .

[0008]

According to the present invention, an input shaft connected to a change lever side and linked to an operation portion of a control valve is provided concentrically outside the input shaft so as to be relatively movable. And a hollow output shaft connected to a shift-and-select shaft side and augmented by pressure air supplied through the control valve as a main element. The spring disposed between the output shaft and the output shaft is supported at one end on the input shaft side, and the other end is connected to a suitable portion on both the input shaft side and the output shaft side via a spring seat. It is characterized by being supported with a preset load applied.

[0009]

A preset load is applied to the spring disposed between the input shaft side and the output shaft side when the change lever is not operated. Therefore, when the input shaft is moved, the preset load is applied to the spring. Since a predetermined pressing force is required to win, the degree of freedom of displacement of the input shaft is limited, and as a result,
The position holding force of the input shaft and, consequently, of the change lever is increased, and wobble is reduced.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an enlarged longitudinal sectional view showing a main part of a booster device according to an embodiment of the present invention, which corresponds to FIG. 3 in the prior art, and the same components are denoted by the same reference numerals. In the drawing, reference numeral 14 denotes an input shaft, which is provided concentrically and relatively movably in a hollow portion of an output shaft 8 slidably supported by a booster main body 15. Is connected to the change lever 2 through the switch. The other end of the input shaft 14 is connected to a lever mechanism 17 which is an operation part of a control valve for supplying compressed air, and the output shaft 8 is moved in accordance with relative movement between the input shaft 14 and the output shaft 8. Supplying pressure air to pressure chambers 19 or 20 formed on both sides of a piston member 18 attached to the outer peripheral surface of
The output shaft 8 is configured to add a boosting action.

Next, the springs 28 and 2 provided between the input shaft 14 and the output shaft 8 are features of the present invention.
9 will be described. That is, the springs 28 and 29 according to the present invention are not different from the conventional example in that one end is respectively supported by the receiving portions 23 and 24 fixed to the input shaft 14 side, but the other end is connected to the output shaft 8. Spring seats 31 and 3 that abut both the receiving portion 25 fixed to the input side and the receiving portion 30 fixed to the input shaft 14 side.
2, and is characterized in that it is supported by squeezing pressure with a preset load applied thereto. Therefore,
Since the degree of freedom of relative movement between the input shaft 14 and the output shaft 8 when the change lever 2 is not operated is limited by the preset load, the position holding force increases,
Wander can be reduced. When a shift operation is performed, the shift operation is naturally performed by adding a pressing force that overcomes the preset load. The progress after the shift operation is not different from the case of the above-mentioned prior art.

[0012]

According to the present invention, as described above, when the change lever is not operated, the input shaft of the transmission operating booster device, and consequently, the degree of freedom of displacement of the change lever is limited by the preset load. Since the position holding force is increased, wobble and play when the change lever is not operated are reduced, and the stability is improved.

[Brief description of the drawings]

FIG. 1 is an enlarged vertical sectional view showing a main part of an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing the entire conventional example.

FIG. 3 is an enlarged vertical sectional view showing a main part of a conventional example.

FIG. 4 is a schematic perspective view showing a main part of a conventional transmission operating device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... shaft for shift and select, 2 ... change lever, 5 ... shift fork, 6 ... shift rod, 7 ... booster device, 8 ... output shaft, 12 ... connecting member, 13 ... slide block, 14 ... input shaft, 15 ... Booster body, 1
6 ... Control valve, 17 ... Lever mechanism, 18 ... Piston member,
19, 20: pressure chamber, 23 to 25: receiving part, 28, 29
... Spring, 30 ... Receiving part, 31,32 ... Spring seat

Claims (1)

(57) [Scope of request for utility model registration] 1. An input shaft connected to a change lever side and linked to an operation portion of a control valve, and a shift and select shaft side disposed concentrically outside the input shaft so as to be relatively movable. A transmission output booster device having, as a main element, a hollow output shaft which is connected to the output shaft and which is intensified by pressure air supplied through the control valve. One end of the spring to be provided is supported on the input shaft side, and the other end is supported in a state where a preset load is applied via a spring seat that abuts an appropriate portion on both the input shaft side and the output shaft side. A booster device for operating a transmission.