JPS62403Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a diaphragm type sleeve cylinder.

A sleeve cylinder in which a piston is pushed by hydraulic pressure, and a push rod whose one end is in contact with the piston is pushed toward the other end to operate various mechanisms, such as an input shaft in a transmission. The piston in the cylinder is designed to disengage the clutch by pushing a push rod that passes through the axis of the cylinder, and the piston is fitted into the cylinder with a piston cup in a fluid-tight manner and slidable in the axial direction. In addition, it was necessary to cut the piston body formed by casting to form the piston cup mounting part, spring seat, rod contact part, etc., and the heat conduction from the gearbox etc. was large.

Therefore, the present invention was devised in view of the above points, and a cylindrical insulator is fitted to the inner circumference of the peripheral wall of a bottomed cylinder body having a port at the bottom, thereby forming a cylinder between the bottom of the cylinder body and the inside of the insulator. The periphery of the diaphragm is sandwiched between the rear end of the insulator and the outer circumference of the bottom of the cylinder body, a hydraulic chamber is formed between the cylinder and the back of the diaphragm, and an atmospheric chamber is formed on the front side of the diaphragm, and the piston is inserted into the atmospheric chamber. The feature is that the push rod is slidably provided on the inner periphery of the insulator, and one end of the push rod protruding into the atmospheric chamber is brought into contact with the piston to press the piston against the front surface of the diaphragm. To provide a diaphragm type sleeve cylinder having a simple structure and excellent heat insulation performance.

An illustrated embodiment will be described below.

The cylinder body 1 has a port 3 at the bottom 2 and an annular locking protrusion 5 projecting inward from the peripheral wall 4, and is integrally molded into a bottomed hollow shape. The insulator 6 fitted on the inner periphery of the peripheral wall 4 of the cylinder body 1 is formed in a cylindrical shape, and an annular recess 7 into which the locking protrusion 5 is locked is formed on the outer periphery, and the front end of the inner periphery A stopper 8 for limiting piston advancement is formed in the piston, and a cylinder 9 is formed inside by the bottom 2 of the cylinder body 1 and the inside of the insulator 6.

When fitting the insulator 6 to the cylinder body 1, the periphery of the diaphragm 10 is held between the outer periphery of the bottom 2 of the cylinder body 1 and the rear end of the insulator 6, and the locking protrusion 5 of the cylinder body 1 is is fitted into the annular recess 7 of the insulator 6, the front end of the insulator 6 is brought into contact with the transmission case cover 12, and the insulator 6 and cylinder body 1 are fixed with bolts 11.
As a result, a hydraulic pressure chamber 13 is defined by the rear surface of the diaphragm 10 and the cylinder 9, and an atmospheric chamber 14 is defined in the front surface of the diaphragm 10, respectively.

In addition, a spring seat 15 provided on the back side of the diaphragm 10
A return spring 16 is compressed between the cylinder body 1 and the bottom 2 of the cylinder body 1, and a ventilation hole 17 is formed which passes through the peripheral wall of the insulator 6 and the peripheral wall 4 of the cylinder body 1 and communicates with the atmospheric chamber 14. be done.

Inside the atmospheric chamber 14, a press piston 18 integrally press-molded is slidably provided on the inner periphery of the insulator 6, and the mission case cover 1
One end of the push rod 20 protruding into the atmospheric chamber 14 through the seal 19 from the second side is brought into contact with the rod receiving part 21 of the press piston 18, and the bottom part 22 of the press piston 18 is pressed against the front surface of the diaphragm 10. When hydraulic pressure is supplied from port 3, diaphragm 10 and press piston 18 are pushed toward the other end of push rod 20, that is, toward mission case cover 12, and the clutch is disengaged.

In the present invention, the cylinder is constructed using an insulator as described above, and the push rod is pushed by the diaphragm and piston, so a cylinder with excellent heat insulation effect can be obtained, and the structure is simple.
It has excellent effects such as being easy to manufacture.

[Brief explanation of the drawing]

The figure is a sectional view showing one embodiment of the present invention. 1 is the cylinder body, 6 is the insulator, 1
0 is the diaphragm, 18 is the press piston, 20
is pushyurotsud.

Claims (1)

[Scope of utility model claims] A cylindrical insulator is fitted to the inner periphery of the peripheral wall of a bottomed cylinder body having a port at the bottom to form a cylinder between the bottom of the cylinder body and the inside of the insulator, and the rear end of the insulator and the outer periphery of the bottom of the cylinder body form a cylinder. A hydraulic chamber is formed between the cylinder and the back surface of the diaphragm, and an atmospheric chamber is formed on the front side of the diaphragm by sandwiching the periphery of the insulator, and a piston is slidably provided inside the insulator inside the atmospheric chamber and protrudes into the atmospheric chamber. A diaphragm type sleeve cylinder characterized in that one end of a push rod is brought into contact with a piston to press the piston against the front surface of a diaphragm.