JPH08270785A - Transmission operating device - Google Patents

Abstract

PURPOSE: To make a shift feeling desirable, simplify structure and reduce cost by providing a shock relieving device attaining damper action of suppressing the sudden motion of a piston rod caused by large load fluctuation generated after going over a balk, coaxially with the rod of a transmission operating assistor. CONSTITUTION: While a piston 7 moves from a neutral position to a position at the shifting time, a viscous fluid in the cylinder 6 of an oil damper device 5 moves from one chamber 8A to the other chamber 8B through the pores 9 of the piston 7 moving integrally with a piston rod 2 and through a clearance between an outer cylinder 6A and an inner cylinder 6B. When the sudden motion of the piston rod 2 caused by large load fluctuation generated after going over a balk is generated. a shock relieving device provided coaxially with the rod of a transmission operating assistor attains damper action by closing pores 10, provided in the balk going-over position A of the cylinder 6, by the piston 7 to reduce the passage flow of the viscous fluid.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operating device for a transmission, and more particularly to a technique for improving a shift feeling.

[0002]

2. Description of the Related Art Conventionally, in a transmission for a large vehicle, a booster (hereinafter referred to as a power shift device) is attached, whereby the operating force of the transmission is amplified and the operating force of a shift knob is reduced. To improve the operability (Japanese Utility Model Laid-Open No. 3-93650 and Japanese Utility Model Laid-Open No. 3-93).
651).

It is also possible to further amplify the operating force of the shift knob by setting the diameter of the cylinder constituting the power shift device to a larger value. However, if the diameter of the cylinder that constitutes the power shift device is increased in this way, the force that amplifies the operating force of the transmission is large, so the speed of the piston rod increases suddenly after the balk, and the operating force increases rapidly. The load feeling is adversely affected such that the load fluctuation is large and the feeling of being sucked in is large, such as decreasing to 0 or becoming negative.

As a measure for solving such a problem,
Conventionally, it has been proposed to provide an impact damper such as an oil damper (see Japanese Utility Model Laid-Open No. 5-61559 and Japanese Utility Model Laid-Open No. 5-42784).

[0005]

However, in the prior art, since the shock absorbing device such as an oil damper is attached separately from the power shift device, the structure is complicated and the number of parts is reduced. There was also a problem in terms of cost. In view of the conventional problems as described above, the present invention provides a booster to the operating device of the transmission, improves the shift feeling, and
The purpose is to simplify the structure and reduce the cost.

[0006]

Therefore, the invention according to claim 1 has a cylinder and an operating force extracting portion in the operation system of the transmission and is slidably disposed in the cylinder body. And a piston rod, and an operating rod connected to a shift lever and movably arranged in the piston rod in an axial direction. An impact mitigation device is provided coaxially with the rod of the booster for operating the transmission so as to provide a damper action that suppresses a sudden movement of the piston rod due to a large load change that occurs after the balk.

According to a second aspect of the present invention, the operation system of the transmission is connected to a cylinder, a piston rod having an operation force extracting portion and slidably arranged in the cylinder body, and a shift lever. And an operating rod disposed in the piston rod so as to be movable in the axial direction, and a transmission including a transmission operating booster, wherein the operating rod is coaxial with the rotary shaft of the operating system. , A rotary shock absorber that has a damper action that suppresses abrupt rotation of the rotary shaft due to large load fluctuations that occur after riding a balk.

[0008]

According to the invention of claim 1, the damper action of the shock absorbing device suppresses the abrupt movement of the piston rod due to a large load variation generated after the balk has passed, resulting in a large load variation after the balk. Is prevented
The shift feeling is improved, such as the feeling of being sucked in is reduced.

According to the second aspect of the present invention, the damper action of the rotary shock absorber suppresses abrupt rotation of the rotating shaft due to a large load change that occurs after the balk, and as a result, the load change after the balk is large. The situation is prevented, the feeling of being sucked in is reduced, and the shift feeling is improved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 shows the structure of an oil damper device as a shock absorbing device in an embodiment of an operating device for a transmission (hereinafter, transmission) according to the first aspect of the invention.

Such an oil damper device is provided coaxially with a rod of a transmission operating booster (hereinafter referred to as a power shift device). The power shift device is connected to a cylinder (not shown), a piston rod (outer shaft) 2 which has an operation force take-out portion (not shown) and is slidably arranged in the body 1 of the cylinder, and a shift lever. And an operating rod (inner shaft) 3 disposed in the piston rod 2 so as to be movable in the axial direction, and a boot 4 provided between the end of the cylinder body 1 and the operating rod 3. Is.

The structure of the oil damper device will be described. A cylinder 6 of an oil damper device 5 is provided near the boot 4 of the cylinder body 1 of the power shift device. The body 7 of the cylinder 6 is composed of an outer cylinder 6A assembled to the cylinder body 1 and an inner cylinder 6B assembled inside the outer cylinder 6A.

A damper piston 7 is fixed to the outer peripheral portion of the outer shaft 2. The piston 7 can reciprocate integrally with the reciprocating motion of the outer shaft 2 in the cylinder 6 filled with a viscous fluid such as silicon oil.
Further, the two chambers 8A and 8B separated by the piston 7 in the cylinder 6 filled with the viscous fluid form a plurality of pores 9 provided in the piston 7 and a gap between the inner cylinder 6B and the outer cylinder 6A. Be communicated through.

In the inner cylinder 6B, a plurality of fine holes 10 are formed at the balk-over position A of the transmission, and at the shift end position B, the fine holes 10 at the balk-over position A.
A plurality of pores 11 set to have a lower flow rate are formed. The unexplained reference numerals 12 are oil seals, respectively. Next, the operation of this configuration will be described.

During shift, while the piston in the power shift device moves from the neutral position to the balk position, the viscous fluid in the cylinder 6 of the oil damper device 5 moves along with the outer shaft 2 into the pores 9 of the piston 7. It moves from one chamber 8A to the other chamber 8B through the gap between the outer cylinder 6A and the inner cylinder 6B. After passing over the balk, the outer shaft 2 tries to move rapidly rapidly, but at that time, the piston 7 blocks the pores 10 provided at the balk overpass position A of the cylinder 6, so that the flow rate of the viscous fluid is small. And the damper action is achieved.

Therefore, the sudden movement of the outer shaft 2 is suppressed. Therefore, after the balk, the speed of the piston rod increases suddenly momentarily, the operating force decreases sharply, and the situation where the load fluctuation becomes large, such as 0 or negative, is prevented, and the feeling of suction is reduced, etc. Good shift feeling. According to such a configuration, the oil damper device 5 is arranged coaxially with the rod of the power shift device. As a result, the structure can be simplified, the number of parts can be reduced, and the cost can be reduced. .

FIG. 2 shows another structure of the oil damper device 5 in one embodiment of the transmission operating device according to the first aspect of the present invention. In this example,
The cylinder 6 is an outer cylinder 6A and an inner cylinder 6B.
And two chambers 8A, 8B separated by a piston 7 in a cylinder 6 filled with a viscous fluid, a plurality of pores 9 provided in the piston 7, and an inner cylinder 6
B communicating with B through the outer cylinder 6A through a gap 1
In place of the configuration of the embodiment of FIG.
Two chambers 8 composed of only A and separated by a piston 13 in an outer cylinder 6A filled with a viscous fluid.
A and 8B are configured to communicate with each other only through a plurality of orifices 14 provided in the piston 13.

In such a structure, the outer shaft 2
When a sudden movement of the outer shaft 2 occurs, the flow rate of the viscous fluid passing through the orifice 14 is throttled, a damper action is exerted, and a sudden movement of the outer shaft 2 is suppressed. Although the oil damper device 5 is arranged in the front part of the power shift device in the above embodiment, it may be arranged in the rear part.

An air damper device may be provided as the shock absorbing device. FIG. 3 shows the structure of an embodiment of the operating device for a transmission according to the second aspect of the present invention. The viscous damper 15 as a rotary oil damper device is provided coaxially with the rotary shaft of the operation system of the transmission.

That is, the shift rod 16 as a rotary shaft in the operation system of the transmission is rotatably arranged in the housing 17. A viscous damper 15 is provided on the outer peripheral portion of the end portion of the shift rod 16, and the viscous damper 15 is housed in a damper housing portion 18 formed at the end portion of the housing 17.

The viscous damper 15 utilizes shearing of a viscous fluid such as grease or silicone oil. That is, the main body 19 of the viscous damper 15 is provided on the inner ring portion 19A fixed to the end portion of the shift rod 16 and the outer peripheral portion of the inner ring portion 19A, and the outer ring portion fixed to the end portion of the housing 17. And 19B.

The solid line C shows the filled state of grease or silicone oil, and 20 is an O-ring. Next, the operation of this configuration will be described. When the shift rod 16 tries to rotate and rotate rapidly rapidly after passing through the balk, the shift rod 16 moves to the viscous damper 15
Since it is fixed to the inner ring portion 19A, the damper action is transmitted to the shift rod 16 due to the shearing of the grease or silicon oil generated between the inner ring portion 19A and the outer ring portion 19B, and the shift rod 16 suddenly moves. Rotation is suppressed.

Therefore, the momentary increase in the speed of the piston rod after the balk prevents the operating force from abruptly decreasing to 0 or a negative value, which prevents a large load fluctuation, and reduces the feeling of inhalation. The shift feeling becomes good. Further, according to such a configuration, the viscous damper 15 is provided coaxially with the shift rod 16 which is the rotary shaft of the operation system of the transmission, and as a result, the structure can be simplified and the number of parts is reduced, resulting in cost It can be reduced.

[0024]

As described above, according to the invention described in claim 1, as a result of disposing the shock absorbing device such as the oil damper device coaxially with the rod of the power shift device, the shift feeling is favorable. In addition, the structure can be simplified, the number of parts can be reduced, and the cost can be reduced.

According to the second aspect of the present invention, the rotary shock absorber such as the rotary oil damper device is provided coaxially with the rotary shaft of the operation system of the transmission. As a result, the shift feeling is improved. The structure can be simplified, the number of parts can be reduced, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the invention described in claim 1.

FIG. 2 is a sectional view of another embodiment.

FIG. 3 is a sectional view showing an embodiment of the invention according to claim 2;

[Explanation of symbols]

 2 Piston rod 3 Inner shaft 5 Oil damper device 15 Viscous damper 16 Shift rod

Claims (2)

[Claims] 1. An operating system of a transmission, a cylinder, a piston rod having an operating force extracting portion and slidably disposed in the cylinder body, and a piston rod connected to a shift lever and in the piston rod. And an operating rod disposed so as to be movable in the axial direction in the transmission, the transmission including a booster for operating the transmission, the baux being coaxial with the rod of the booster for operating the transmission. An operating device for a transmission, comprising: a shock absorbing device that has a damper action that suppresses a sudden movement of a piston rod due to a large load change that occurs after boarding. 2. A transmission operating system comprising a cylinder, a piston rod having an operating force extracting portion and slidably disposed in the cylinder body, and a piston rod connected to a shift lever and in the piston rod. In a transmission equipped with a transmission operating booster configured to include an operating rod that is axially movable, and that occurs after the balk ride over, coaxial with the rotation axis of the operating system. An operating device for a transmission, comprising a rotary shock absorbing device having a damper action for suppressing abrupt rotation of a rotating shaft due to a large load change.