JPH08184371A - Booster for operating transmission for automobile - Google Patents

Abstract

PURPOSE: To provide a booster for operating a transmission preventing collision of input and output shafts to prevent the generation of noise and improve a feeling during a shift. CONSTITUTION: A booster for operating a transmission for an automobile is of a type wherein a casing 1 is provided at its interior with a sleeve-form output shaft 3 coupled to an output part 8 to a transmission and an input shaft movable through the output shaft 3 coupled to a change lever, and a working air pressure is exerted on the output shaft 3 through displacement of the input shaft and the output shaft 3. Thus, the input shaft 3 arranged in the sleeve-form output shaft 3 is provided with first and second pistons 15 and 16 and a piston rod 16a through which the pistons 15 and 16 are interconnected. A radially internally protruding annular protrusion 17 is formed on the sleeve-form output shaft 3. The protrusion part 17 has a narrow distance 19 between the piston rod 16a and the protrusion part and spaces 18a and 18b between the first and second pistons 15 and 16 are filled with oil.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a sleeve-shaped output shaft connected to an output portion of a transmission in a casing, and an input shaft connected to a change lever and movable in the output shaft. The present invention relates to a booster for operating a transmission of an automobile, in which working air pressure acts on the output shaft due to displacement of the shaft and the output shaft.

[0002]

2. Description of the Related Art For example, as shown in FIG. 2, a cylinder 1a is provided in a casing 1 of a booster for operating a transmission, and a piston 2 moving in the cylinder 1a is provided with an output shaft 3 forming a sleeve-shaped rod. An input shaft 4 is provided inside the output shaft 3 so as to be movable, and the input shaft 4 is the output shaft 3 described above.
By-passing a ball joint 8 which is an output portion to a transmission (not shown) provided at an end portion of the above, the bolt 7 is connected to the bypass rod 5 via a connecting member 6.

The bypass rod 5 is connected to a change lever (not shown). When the change lever shifts the transmission, the input shaft 4 moves, and the rod 9 connected to the input shaft 4 rotates the link 12. The piston 10
A booster for operating a transmission, which drives a valve 11 to send high-pressure air to a cylinder 1, moves a piston 2 with an amplified output, and shifts a transmission via a ball joint 8 by an output shaft 3, It is known (see, for example, Japanese Utility Model Laid-Open No. 3-51272).

Reference numeral 1b is a cover of the casing 1, and reference numeral 14 is a bracket for fixing the casing.

[0005]

However, in the above technique, the connecting member 6 is provided on the output shaft 3 at the position where the bypass rod 5 and the input shaft 4 where the input shaft and the output shaft intersect each other are connected. Passing through the bored hole 13 and
The hole 13 has a margin such that the input shaft 4 is slightly displaced.

When the change lever is operated,
Input shaft 4 from change lever via bypass rod 5
Is displaced to drive the valve 11 and apply air pressure to the piston 2. When the gear synchronization is completed in the transmission, the output shaft 3 of the booster moves abruptly and shifts because the piston 2 is under air pressure.
And the hole 13 collide with each other, and the bypass rod 5 is attached to the shift lever.
The impact is transmitted to the change lever via the, and noise is generated or the feeling is adversely affected.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a booster device for operating a transmission which prevents collision of input / output shafts in order to improve noise and feeling during shifting.

[0008]

According to the present invention, a sleeve-shaped output shaft connected to an output portion to a transmission in a casing, and an input shaft connected to a change lever and movable in the output shaft. A booster for operating a transmission of an automobile in which working air pressure acts on the output shaft by displacement of the input shaft and the output shaft, the first and second input shafts provided in the sleeve-shaped output shaft are provided. A second piston and a piston rod connecting the pistons are provided, and a ring-shaped convex portion protruding inward in the radial direction is provided on the sleeve-shaped output shaft, and the convex portion has a narrow interval with the piston rod. The space between the first and second pistons is filled with oil.

[0009]

The present invention is constructed as described above, and a narrow gap is formed between the convex portion provided on the output shaft and the piston rod between the first piston and the second piston of the input shaft. Since both pistons are separated into two chambers, when the output shaft makes a sudden movement, the sudden movement of the output shaft is alleviated due to the oil flow resistance due to the volume change between the two chambers, and the input / output shaft becomes Collision at part A is prevented.

Therefore, no noise is produced by the change lever and the feeling is not adversely affected.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

In the drawings, members having the same function are designated by the same reference numerals and the description thereof is omitted.

FIG. 1 is a side sectional view of a main portion of a booster for operating a transmission according to the present invention, in which a first piston 1 is provided inside a sleeve-shaped output shaft 3 movably provided in a casing 1.
5 and a second piston 16 are provided, the first piston 15 is connected to a piston rod 16 a provided on the second piston 16 by a pin 20, and the second piston 16 is connected by a pin 20 to the rod 9. It is connected to the.

The first piston 15 is connected to the bypass rod 5 by a bolt 7 via a connecting member 6 to form an input shaft, and the bypass rod 5 is connected to a change lever (not shown).

A ring-shaped convex portion 17 is formed inside the output shaft 3 at a position between the first piston 15 and the second piston 16, and a narrow gap is formed between the output shaft 3 and the outer shape of the piston rod 16a. 19 is formed, and the space 18a and the space 18b are connected to both sides of the convex portion 17 with a narrow gap 19, and the space is filled with oil.

Reference numerals 21 and 22 denote rubber rings.

The operation will be described below.

When a change lever (not shown) is operated,
Bypass rod 5 moves, first and second piston 1
5 and 16 move.

In FIG. 1, when the valve 11 described above is operated and the gears of the transmission are synchronized, the output shaft 3 starts to move suddenly by air pressure, but in the space on both sides of the convex portion 17 of the output shaft 3. Since there is oil, and the oil communicates only with the narrow gap 19, the displacement speed of the output shaft is moderated due to the movement resistance of the oil moving in the two spaces by the gap 19, and the output shaft 3 is connected to the connecting member 6. Collision with the part A is prevented.

Therefore, no noise is produced at the change lever portion and the shift feeling is not deteriorated.

[0021]

The present invention is configured as described above, and can exhibit the following excellent effects. (1) The narrow gap formed by the convex portion of the output shaft and the outer diameter of the piston rod serves as a resistance against the passage of oil, and the sudden operation of the output shaft is alleviated. (2) Therefore, the collision between the output shaft and the input shaft is prevented, and the change lever portion does not generate noise and the shift feeling does not deteriorate. (3) Since the orifice device is provided inside the output shaft, the booster can be made compact.

[Brief description of drawings]

FIG. 1 is a side cross-sectional view of a main part of a booster device for operating a transmission showing an embodiment of the present invention.

FIG. 2 is a side sectional view of a booster device for operating a transmission showing an example of a conventional technique.

[Explanation of symbols]

 1 ... Casing 2 ... Piston 3 ... Output shaft 4 ... Input shaft 5 ... Bypass rod 6 ... Connection member 11 ... Valve 15 ... 1st piston 16 ... 2nd piston 17 ... Convex part 19 ... Gap

Claims (1)

[Claims] 1. A casing is provided with a sleeve-shaped output shaft connected to an output portion to a transmission, and an input shaft connected to a change lever and movable in the output shaft. In a booster for operating a transmission of an automobile of a type in which operating air pressure acts on an output shaft due to displacement, a first input shaft provided in a sleeve-shaped output shaft
And a second piston and a piston rod connecting these pistons are provided, and a sleeve-shaped output shaft is provided with a ring-shaped convex portion projecting inward in the radial direction, and the convex portion has a narrow interval with the piston rod. A booster for operating a transmission of an automobile, characterized in that the space between the first and second pistons is filled with oil.