JPH0315867Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to a synchronization auxiliary device that assists synchronization by applying braking to the countershaft of a transmission mounted on a vehicle such as an automobile.

(B) Prior Art A conventional synchronization auxiliary device of this type is described in, for example, Japanese Utility Model Application Publication No. 59-83128. That is, the brake disk assembly is pressed by a piston operated by fluid pressure.

By the way, when a piston is used in this way, a sealing material such as an O-ring is provided to make the piston and the case airtight.

However, the heat generated in the brake disc assembly is transmitted to each member, which adversely affects the operating pressure and reduces the durability of the sliding parts, especially the O-ring, making it difficult to maintain proper operation. There was a fear that it would be difficult.

(c) Purpose of the invention The present invention was created in view of the above problems, and uses a diaphragm to stabilize the operating pressure and improve the durability of the device by suppressing thermal effects. The purpose is to provide a synchronization auxiliary device.

(d) Structure of the invention In order to achieve the above object, this invention includes a brake housing, a brake disc assembly having a disc friction that is spline-fitted to a countershaft within the brake housing, and a brake disc assembly that includes a brake disc assembly. In a synchronization auxiliary device comprising a pressure member that presses and a pressure chamber that biases and releases the bias in the pressing direction by supplying and discharging pressure fluid to the pressure member, the pressure member has an outer peripheral portion attached to the brake housing. A pressing device consisting of a member in which a fixed diaphragm is sandwiched between a pressure plate and a support plate, and the center part is integrally connected with a support pin, and the pressure plate forms a cylindrical heat transfer path. The synchronization auxiliary device has a pressing portion, and at least a portion of the pressing portion is made of a heat insulating material.

(E) Embodiment An embodiment of the present invention will be described below based on the drawings.

In FIG. 1, a brake disk assembly 2 housed in a case 1 is composed of a disk friction 3 spline-fitted to a countershaft (not shown) and a plate friction 4, which are alternately stacked on top of each other. A spring 5 is interposed between the plate frictions 4. One side of the plate friction 4 at both ends is in contact with the inner wall of the case 1, and the other side is in contact with a pressure plate 8 as a pressure member described later.

Further, the plate friction 4 is supported by the case 1 via a protection plate 6 so as to be movable in the axial direction and engaged in the circumferential direction. This protective plate 6
are provided in plurality, are curved as shown in FIG. 2, have notches 7 at both ends, and
The case 1, which is made of aluminum or the like, is protected from impact when the assembly 2 brakes the countershaft.

By the way, the pressure plate 8 has a main body molded with resin, and consists of a cylindrical pressing part 9 and a bottom part 10 integrated with this, and a ring-shaped part at the tip of the pressing part 9 that comes into contact with the plate friction 4. A heat insulating material P is provided. A diaphragm 11 is uniformly held in the bottom portion 10 by a support plate 14 fastened with a support pin 13. This diaphragm 11 is made of rubber or a composite material of rubber and cloth.

Further, 15 is a lid provided with an insertion hole 16 having a tapered female threaded portion 16a, and constitutes a brake housing together with the case 1. This lid 15
When the diaphragm 11 is fixed to the case 1 with the screws 17, the enlarged outer circumferential portion 11a of the diaphragm 11 is held in place, and the pressure chamber 8 is movably supported. Form A. The case 1 and the lid 15 are sealed by the outer peripheral portion 11a of the diaphragm 11. A passage 18 is provided in the support pin 13 protruding into the insertion hole 16 by dropping the side surface of the support pin 13 having a circular cross section.
Fluid can be supplied and discharged into the pressure chamber A through 8,
The pressure plate 8 is configured to press the assembly 2 and brake the countershaft.

Note that this insertion hole 16 may be sealed by screwing a plug 19 formed with a tapered thread, and a connection port for a fluid supply/discharge device may be specially provided.

On the other hand, 20 is a fixing means, which is detachably provided in an insertion hole 16 provided in the lid 15, and has a spring pin 21 and a tapered screw 22 formed integrally with the main body 23 at its tip.

Next, its effect will be explained. The assembly to the countershaft will be described later, but during operation, air as a pressure fluid is supplied to the pressure chamber A in response to shift-up detection, and the brake disk assembly 2 is pressed through the pressure plate 8.
This pressing applies a brake between the plate friction 4 that engages with the case 1 and the disc friction 3 that engages with a countershaft (not shown), thereby braking the countershaft. For this reason, for example, if the gear ratio changes when shifting up, the required rotational speed of the countershaft during gear shifting will decrease, but due to braking, the rotation of the countershaft, which had been rotating at a high rotational speed according to the engine rotation, will increase to the required rotational speed. It can be brought close and can assist the synchronization mechanism. Therefore, it is possible to reduce the capacity while increasing the durability of the synchronizing mechanism, and it is possible to reduce the size of the transmission. When the air in the pressure chamber A is exhausted, the plate friction 4 is separated by the bias of the spring 5, and the disk friction 3 can rotate freely.
The brake on the countershaft is released.

During such braking, the heat generated in the brake disc assembly 2 tries to be transferred to the pressure plate 8 side, but due to the presence of the heat insulating material P, the amount of heat transferred is extremely small, and the main body of the pressure plate 8 is Since it is molded with resin, heat insulation is performed here as well, and the diaphragm 11 made of rubber or the like is protected from heat, and the air within the pressure chamber A is not affected by heat. Therefore, by supplying and discharging air etc. to the pressure chamber A, the intended function of the diaphragm 11 is effectively exhibited, and accurate and quick operation can be expected. In addition, pressure plate 8
is not in contact with the case 1 and is a component of the pressure chamber A using the diaphragm 11,
The movement responsiveness of the pressure plate 8 is extremely high, and extremely accurate braking can be performed.

When assembling, in the sub-assembled state as shown in FIG. Press. By this pressing, the plate friction 4 is pressed through the support pin 13 and the pressure plate 8, and the assembly 2 is pressed between it and the case 1, and the disk friction 3 is fixed. This fixation prevents the disc friction 3 from dangling when assembling the synchronization auxiliary device to the countershaft, and allows easy spline fitting to the countershaft.

After spline fitting the disk friction 3 to the countershaft, the case 1 and lid 15 are
The brake housing consisting of is fixed to the clutch housing (not shown) with bolts (not shown).

After assembly, the fixing member 20 is removed and a fluid supply/discharge device is connected to the insertion hole 16 via a predetermined piping.

Note that this invention is not limited to the above embodiment. For example, the pressure plate body can be made of metal. Alternatively, the entire structure can be made of a heat insulating material. The heat insulating material can also be provided only on the diaphragm side.

The method can also be applied to the cited Utility Model Application Publication No. 59-83128.

(f) Effects of the invention Since the present invention is constructed as described above, the presence of the heat insulating material restricts the heat generated in the brake disc assembly from being transferred to the pressure member and the working chamber. By stabilizing the operating pressure, it is possible to maintain proper operation and improve the durability of the device.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an assembly device according to an embodiment of the invention, and FIG. 2 is a perspective view of a protection plate. 1... Case (brake housing), 2...
Brake disc assembly, 8...pressure plate (pressure member), 15...lid (brake housing), P...insulation material.

Claims (1)

[Scope of utility model registration request] a brake housing; a brake disc assembly having a disc friction spline-fitted to a countershaft within the brake housing; a pressure member for pressing the brake disc assembly; and a pressure fluid for supplying and discharging the pressure fluid to and from the pressure member. In the synchronization auxiliary device, the pressure chamber includes a pressure chamber that biases and releases the bias in a pressing direction, and the pressure member has a diaphragm whose outer peripheral portion is fixed to the brake housing, which is sandwiched between a pressure plate and a support plate. The pressure plate has a pressing part forming a cylindrical heat transfer path, and at least a part of the pressing part is made of a heat insulating material. A synchronization auxiliary device characterized in that it is formed by