JPH028181B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an accumulator (lid pressure device) formed in a hydraulic control circuit of an automatic transmission for a vehicle.

Automatic transmissions installed in vehicles such as cars are
There is a strong demand for compactness from the perspective of improving mounting ease, and in hydraulic control devices installed in automatic transmissions, the accumulator was conventionally installed on the valve body or valve body cover, so the cylinder, piston, spring, etc. that make up the accumulator are The space occupied by the hydraulic control circuit is often detrimental to the compact design of the hydraulic control circuit.

An object of the present invention is to form an accumulator separately from the valve body or valve body cover of a hydraulic control device, thereby facilitating the compact design of the hydraulic control device, and (a) changing the accumulator specifications in accordance with engine performance. is easy.

(b) Space can be saved by the thickness of the bottom of the cylinder and the gaps created between parts on the extension.

(c) No need to drill holes for oil drainage inside the spring.

(d) Productivity is improved by separately machining the accumulator cylinder.

An object of the present invention is to provide an accumulator for a vehicle automatic transmission that has the following advantages.

As shown in FIG. 1, for example, the accumulator for a vehicle automatic transmission according to the present invention has an orifice-equipped plate 2 that is covered with an oil passage groove 13 provided on the surface of a valve body 1 of a hydraulic control device.
An accumulator chamber is formed between a cylinder 3 which is open at both ends and which is fastened to the valve body 1 so that one end opening surrounds the orifice 21, and the orifice-equipped plate 2 which is fitted into the cylinder. A valve body cover 5 fastened to the valve body 1 with a gap 9 between the piston 4 and the other end opening of the cylinder 3; and a side opposite to the accumulator chamber of the valve body cover 5 and the piston 4. Spring 6 interposed between
It is characterized by consisting of.

Based on the above configuration, the hydraulic pressure supplied to the oil passage groove 13 of the valve body 1 is guided to the accumulator chamber of the present accumulator via the orifice 21 formed in the plate 2. As a result, the piston 4 moves against the spring 6 to smoothly increase the hydraulic pressure supplied to the hydraulic servo based on the characteristics of the accumulator, thereby reducing shock during gear shifting. At this time, the volume of the chamber on the side where the spring 6 is located in the cylinder 3 changes as the piston 4 moves, but as the other end of the cylinder 3 opens, a gap 9 exists between it and the valve body cover 5. Therefore, the fluid in the chamber flows freely and the piston 4
does not impede smooth movement.

In addition, since the cylinder 3 has a cylindrical shape with both ends open, the cylinder diameter and spring 6 can be easily changed, and the accumulator characteristics can be easily changed in accordance with the engine power performance and hydraulic servo capacity. Furthermore, since the cylinder 3 is open and does not have a bottom part, there is a gap between the thick bottom part and the cover.
It can be configured compactly by eliminating the space between the parts, eliminates the need to drill holes for fluid discharge due to the change in volume, and is easy to use since the cylinder is separate and is a cylindrical member with openings at both ends. It can be processed into

Note that the symbols in brackets are used to contrast with the drawings to facilitate understanding, but do not limit the structure in any way.

Next, the present invention will be explained based on an embodiment shown in the drawings.

1 is a valve body in which a hydraulic control device for a vehicle automatic transmission is formed; 11, 12, and 13 are grooves for oil passages formed on its surface during casting; in this example, a transmission is housed inside. The peripheral portion of the center case, which is inserted between the transmission case and the torque converter case in which a fluid coupling such as a torque converter is housed, is used as the valve body. 2
3 is a plate with an orifice 21 which is attached to the oil passage groove forming surface 14 of the valve body 1 and communicates with the oil passage groove 13; 3 is an oil passage groove formed on the valve body 1 so as to surround the orifice 21 of the plate; A cylinder 4 whose flanged end 31 is fastened to the surface 14 with a bolt 32 via the plate 2;
5 is a piston that is slidably fitted into the cylinder 3 and has an O-ring 41 fitted around its outer periphery; 5 is an automatic transmission member that is present on the other end of the cylinder 3, and is fitted so as to surround the cylinder; The valve body cover is fastened to the valve body, 6 is a spring interposed between the valve body cover and the piston, and 7 and 8 are sealing gaskets on the fastening surface.

As explained above, in the accumulator of the automatic transmission for a vehicle according to the present invention, the inside of the cylinder 3 formed separately from the valve body 1 has a through hole, and the piston 4 and the spring 6 are provided inside the cylinder 3, and the spring 6 is inside the cylinder. The structure is such that it is supported by the mating part (valve body cover 5 in the above embodiment) from the through-hole of the cylinder 3, and an appropriate gap 9 is provided between the tip of the through-hole in the cylinder 3 and the mating part. This facilitates the compact design of the hydraulic control device and has the following effects.

(a) It is easy to change the accumulator specifications to match the engine power performance.

(b) Space can be saved by the thickness of the bottom of the cylinder and the gaps created between parts on the extension.

(c) No need to drill holes for oil drainage inside the spring.

(d) Productivity is improved through separate processing of the accumulator cylinder.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an accumulator of an automatic transmission for a vehicle according to the present invention, and FIG. 2 is a plan view. In the diagram, 1... Valve body, 2... Plate, 21...
Orifice, 3...Cylinder, 4...Piston, 5...
Valve body cover, 6...spring, 13...oil channel groove.

Claims (1)

[Claims] 1. A plate with an orifice attached to an oil passage groove provided on the surface of a valve body of a hydraulic control device, a cylinder having both ends open and fastened to the valve body so that one end opening surrounds the orifice, and the cylinder. a valve body cover that is fastened to the valve body with a gap between the piston that is fitted into the cylinder and forms an accumulator chamber with the orifice-equipped plate, and the other end opening of the cylinder; An accumulator for an automatic transmission for a vehicle, comprising a spring interposed between a valve body cover and the piston on the opposite side of the accumulator chamber.