JPS6148602A - Accumulator - Google Patents

Abstract

PURPOSE:To prevent misassembling of springs, lack of spring or piston parts and interference of the spring with the piston by fixing springs to the piston fittedly enclosing an accumulator chamber. CONSTITUTION:In forming a piston 4, convex parts 4c and 4d of small diameter are provided on the both sides of a division wall 4a of the piston 4. Respective one end of the first compression coil spring 5a and the second compression coil spring 5b are formed into spiral spring parts 5c and 5d, each of whose center parts has a diameter allowing the convex part 4c or 4d to be inserted, and the first compression coil spring 5a and the second compression coil spring 5b are fitted to the convex parts 4c and 4d on the division wall 4a of the piston 4 by swaging and caulking the ends of convex parts 4c and 4d after the center parts of the spiral spring parts 5c and 5d have been inserted into the convex parts 4c and 4d of the division wall 4a.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an accumulator that accumulates fluid pressure.

[Prior Art] An accumulator is provided slidably between a housing defining a cylinder chamber and a first position and a second position within the cylinder chamber, and the accumulator is disposed on the side of the first position. The housing includes a piston that defines a chamber, and a spring that biases the piston toward the first position or the second position. It consists of a housing chamber in which the piston and spring are inserted into the housing chamber, and a housing lid part to complete the housing. Conventionally, when assembling an accumulator, for example, the first position is on the housing lid part side. , when the spring is provided to bias the piston toward the first position, first insert the spring into the housing chamber,
Next, the piston was inserted and the housing cover was attached.

[Problems to be Solved by the Invention] In the above-mentioned conventional technology, the piston and the spring are provided separately; for example, the natural length of the spring is shorter than the stroke length of the piston, and the spring arrangement When the stroke length of the provided side is longer than the natural length of the spring, the spring falls to the side internally, and when the stroke length of the piston is shortened, the piston does not stroke to the end. When two or more types of springs are prepared at the time of assembly, or when the direction of the spring is specified, there is a risk of incorrectly assembling the spring. If two or more types of springs with different diameters are arranged in the same direction, the springs will mesh with each other in a stretched state, and will not contract when the springs are pressed. When the piston strokes, the spring comes into sliding contact with the inner wall of the piston, generating sliding resistance.

Since the piston and spring were supplied separately when assembling the accumulator, there were various problems such as the fact that only six pieces were missing.

The purpose of the present invention is to prevent incorrect assembly of the spring by fixing the spring to the piston, prevent missing parts of the spring or the piston,
To provide an accumulator that can prevent interference between a spring and a piston.

Means for Solving Problem F] In order to solve the above problems, the accumulator of the present invention, as shown in FIG. a piston 4 which is slidably disposed between a position and a second position and defines an accumulator chamber 3 on the side of the first position; In the accumulator having a spring 5 biased toward the second position, the spring 5 is fixed to the piston 4.

[Actions and Effects of the Invention] The accumulator of the present invention having the above configuration has the following effects due to the spring being fixed to the piston.

b) Since the piston and spring are fixed, it is possible to prevent the wrong spring from being erroneously assembled as the specified spring.

Since the piston and spring are fixed, if the spring has a specified mounting direction, it is possible to prevent the accumulator from being erroneously assembled in the opposite direction.

C) Since the piston and spring are fixed, it is possible to prevent the occurrence of a shortage of only the piston or only the spring.

2) Since the piston and the spring are fixed, it is possible to prevent the piston and the spring from interfering with each other.

[Effects of Examples] e) When two or more types of springs with different diameters are arranged in the same direction, the springs do not interfere with each other because they are supported by the piston.

f) When the natural length of the spring is shorter than the stroke length of the piston, the spring is attached to the piston and strokes, so this prevents the spring from tilting in the accumulator when the stroke length is made longer than the natural length of the spring. I can do it.

g) The piston is made of a relatively soft metal such as copper, aluminum, or brass, and a boss is provided at the spring mounting position, and the spring is compressed into a spiral spring so that the center of the spring can be inserted into the boss of the piston. By forming a coil spring, the center of the spiral spring part formed on the negative end side of the spring can be fitted into the boss part of the piston, and if the end of the boss part is caulked to attach the spring to the piston, the number of parts can be increased. The spring can be attached to the piston without having to do so.

[Embodiment] Next, the accumulator of the present invention will be explained based on an embodiment shown in the drawings.

FIG. 1 shows a first embodiment of the accumulator of the present invention.

The accumulator of this embodiment is used for accumulating pressure in a hydraulic actuator that engages and disengages a frictional engagement device that transmits and interrupts power by engaging and disengaging in a vehicle automatic transmission. a housing 2 defining a first position;
A partition wall 4a which is a partition defining the accumulator chamber 3 on the side of the position and a cylindrical cylindrical wall 4 supporting the partition wall 4a.
A piston 4 made of a relatively soft metal such as copper, brass, or aluminum having a
Between the first compression coil spring 5a, which is the spring 5 that urges the spring 5 toward the position of The second spring 5 is biased toward the second position only at certain times.
The piston 4 has small-diameter convex portions 4c and 4d on both sides of the partition wall 4a when the piston 4 is molded.
A convex portion 4c of the partition wall 4a is provided, and the convex portion 4c of the partition wall 4a is centered at one end of each of the first compression coil spring 5a and the second compression coil spring 5b.

4d is a spiral spring portion 5C15d having an insertable body, and the convex portion 4c of the partition wall 4a is located in the center of the spiral spring portions 5c and 5d.

4d, and by crushing and caulking the ends of the protrusions 4c, 4a, the first compression coil spring 5a and the second compression coil spring 5b form the protrusion 4c of the partition wall 4a of the piston 4.

It is attached to 4d.

FIG. 2 shows a second embodiment of the accumulator of the invention.

In this embodiment, the spring 5 is a third spring included in the cylindrical wall 4b that always biases the partition wall 4a of the piston 4 toward the first position.
The compression coil spring 5e is disposed on the inner periphery of the third compression coil spring 5e, and the position where the piston 4 is displaced from the first position to the second position by a predetermined m and the second position is A fourth compression coil spring 5 is provided that biases the partition wall 4a of the piston 4 toward the first position only when the partition wall 4a is located between the inner circumferential wall of the cylindrical wall 4b. supported by the 4th
The compression coil spring 5f has a female thread with a small diameter inner peripheral side at the center on the side where the third compression coil spring 5e and the fourth compression coil spring 5f of the partition wall 4a are disposed at the 20,000 ends. The spiral threaded portion 5Q has a center portion with a diameter corresponding to the diameter of the portion 4e, and by fastening the bolt 4 corresponding to the female threaded portion 4e to the female threaded portion 4e via the spiral threaded portion 5g, the third The piston 4 is located on the inner peripheral side of the compression coil spring 5e.
The mounting number is stamped on the partition wall 4a.

FIG. 3 shows a third embodiment of the accumulator of the present invention.

In this embodiment, the piston 4 is made of a press-molded product made of a metal plate, and a fifth compression coil spring 5h of the spring 5 is provided to bias the piston 4 toward the first position when the piston 4 is press-molded. The fifth compression coil spring 5 is attached to the partition wall 4a
A convex portion 4g having a slightly larger diameter than the diameter of one end of the convex portion 4g is formed, and one end of a fifth compression coil spring 5g is expanded around the outer periphery of the convex portion 4g, and is attached by the restoring force of the fifth compression coil spring 5g. ing. Further, in order to partition the cylinder chamber 1 airtightly by the piston 4, oil seal members 6 are provided at both ends of the outer periphery of the cylindrical wall 4b by adhesion or welding.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a first embodiment of the invention, FIG. 2 is a sectional view showing a second embodiment of the invention, and FIG. 3 is a sectional view showing a third embodiment of the invention.
It is a sectional view showing an example.

Claims (1)

[Scope of Claims] 1) A housing defining a cylinder chamber, and an accumulator provided slidably between a first position and a second position in the cylinder chamber, and an accumulator on the side of the first position. In the accumulator, the accumulator includes a piston defining a chamber and a spring biasing the piston toward the first position or the second position, the spring being fixed to the piston. Accumulator featuring. 2) The spring is a compression coil spring with a spiral spring portion at one end thereof, and is attached to the piston by caulking the center of the spiral spring portion. Accumulator listed. 3) The spring is a compression coil spring with a spiral spring section at one end thereof, and the center of the spiral spring section is attached to the piston with a bolt. accumulator. 4) The spring is a compression coil spring, and a force is applied to the outer periphery of the mounting portion, where the inner outer periphery of the piston is a recessed part, to expand one end of the compression coil spring and restore it to its original shape on the inner periphery side. Claim 1 characterized in that it is attached with
Accumulator as described in section. 5) The piston is a press-molded product in which a mounting portion with a convex outer periphery is formed inside the piston, and a sealing material that slides airtight within the cylinder chamber is provided at both ends of the outer cylindrical portion. 5. The accumulator according to claim 4, wherein the accumulator is formed by adhesion or welding.