JPH0315866Y2 - - 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 No. 59-83128. That is, the brake disc assembly is pressed against a piston that is operated by fluid pressure.

By the way, in such a synchronization auxiliary device, the sliding part between the piston and the housing is sealed with an O-ring, so the O-ring acts as a resistance to the sliding of the piston and prevents smooth operation. There was a fear that it would be impossible to provide appropriate synchronization assistance due to restrictions. Furthermore, there was a risk of leakage of the working fluid due to wear of the O-ring, resulting in a durability problem.

(c) Purpose of the invention The present invention has been made in view of the above problems, and aims to provide a synchronization auxiliary device that can be expected to operate accurately and is durable.

(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. It is composed 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 support pin slides into a through hole in the pressing direction of the brake housing. 1 is a synchronization aid, characterized in that it is supported in a synchronizing manner;

(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 one on top of the other. A spring 5 is interposed between the 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 is molded with resin and consists of a cylindrical pressing part 9 and a bottom part 10 integrated with this.
A diaphragm 11 is uniformly held on the bottom part 10 by a support plate 14 fastened with a support pin 13. This diaphragm 11 is made of, for example, rubber or a composite material of rubber and cloth.

Further, 15 is a lid provided with an insertion hole (through hole penetrating the inside and outside of the lid) 16 having a tapered female thread, and together with the case 1 constitutes a brake housing. When fixing this lid 15 to the case 1 with screws 17, the diaphragm 11
A pressure chamber A to which fluid can be supplied and discharged is formed in the case 1 while movably supporting the pressure plate 8 by sandwiching the enlarged outer peripheral portion 11a of the pressure plate 8. The case 1 and the lid 15 are the outer periphery 1 of the diaphragm 11.
1a. The support pin 13 is supported in the insertion hole 16 so as to be slidable in the axial direction, in other words, in the direction in which the assembly 2 is pressed. Therefore, the pressure plate 8 can be supported reliably. The side surface of the support pin 13 is dropped, and a passage 18 is formed between the support pin 13 and the insertion hole 16. When a fluid supply/discharge device (not shown) is connected to the insertion hole 16, fluid can be supplied and discharged through this passage 18, and the pressure plate 8 presses the assembly 2 to brake the countershaft. ing.

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 for fixing the assembly 2 when attached to the countershaft, and the lid 1
The spring pin 21 and the tapered screw 22 are integrally formed on the main body 23 at the tip.

Next, to explain its operation, when attempting to attach it to the countershaft in the sub-assembled state as shown in FIG. The support pin 13 is pressed by the spring pin 21. 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 wobbling 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 means 20 is removed and a fluid supply/discharge device is connected to the insertion hole 16 via a predetermined piping.

During operation, air 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. At this time, the pressure plate 8 is reliably supported by the support pin 13 supported in the insertion hole 16. When sliding in the axial direction, the pressure plate 8 is not subjected to resistance unlike when an O-ring is used, and smooth sliding can be achieved. Further, the diaphragm 11 forming the pressure chamber A does not wear out unlike an O-ring, and is durable. By the pressing, a brake is applied between the plate friction 4 that engages with the case 1 and the disc friction 3 that engages with a countershaft (not shown), and the countershaft is braked. For this reason, for example, if the gear ratio changes when shifting up, the required rotation speed of the countershaft during gear shifting will decrease, but the rotation of the countershaft, which has been rotating at a high rotation speed according to the engine rotation, will be brought closer to the required rotation speed. It can assist the synchronization mechanism. Therefore, the durability of the synchronizing mechanism can be increased while the capacity can be reduced, and the transmission can be made smaller.

When the air in pressure chamber A is exhausted, spring 5
Due to the biasing force, the plate friction 4 is separated and the disk friction 3 can rotate freely, and the braking is released.

Heat generated in the brake disc assembly 2 during braking is transmitted to the pressure plate 8, but since the pressure plate 8 is molded with resin, the diaphragm 11 made of rubber or the like is protected from the heat. Further, the pressure plate 8 is not in contact with the case 1, and the diaphragm 1
1 constitutes the pressure chamber A, the movement responsiveness of the pressure plate 8 is extremely high, and extremely accurate braking can be performed.

Incidentally, this invention can also be applied to the invention described in Japanese Utility Model Application Publication No. 59-83128.

(f) Effect of the invention As is clear from the above, according to the structure of this invention, since no O-ring is used between the sliding part of the pressure plate and the brake housing, the sliding resistance is extremely small, and Since the shear plate is supported slidably in the pressing direction with respect to the housing side, the diaphragm functions smoothly, the sliding movement of the pressure plate can be stabilized, and synchronization assistance can be performed reliably and quickly. Additionally, the diaphragm does not suffer from wear like an O-ring and is durable.

[Brief explanation of drawings]

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, 3... Disk friction, 8... Pressure plate (pressure member), 11... Diaphragm, 15
...Lid (brake housing), 16...Through hole,
20...Fixing member (fixing means).

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. What is claimed is: 1. A synchronization auxiliary device comprising a member whose center portion is integrally joined by a support pin, the support pin being slidably supported in a through hole in the pressing direction of the brake housing.