JPH0627434U - Fixed structure of piston and rod - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a structure for fixing a piston and a rod, which can simultaneously improve the efficiency of cylinder assembly work and reduce the cost. A rod 1 having an annular groove 2 on its outer circumference, and an annular piston 4 fitted on the outer circumference of the rod 1 and having an annular groove 6 facing the annular groove 2 on its inner circumference; The wire 8 is drawn between the annular grooves 2 and 4 by at least one rotation of the rod 1 and locks the piston 4 axially with respect to the rod 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure for fixing a piston and a rod in a power cylinder or the like of a power steering device for an automobile.

[0002]

[Prior art]

 Conventionally, in a power cylinder of a power steering apparatus, as shown in FIG. 4, a pair of annular grooves 21 and 22 are formed on the outer circumference of a steering link shaft 20 (rod), and one steering wheel is provided in one annular groove 21. A C ring 23 protruding from the outer periphery of the link shaft 20 is attached, and one end 24a of a piston 24 fitted to the outer periphery of the steering link shaft 20 is abutted against the C ring 23, and the other end 24b of the piston 24 is added. The piston 24 is fixed to the outer circumference of the steering link shaft 20 by being engaged with the other annular groove 22 by tightening. As a fixing structure of the piston and the rod similar to the above, there is one described in, for example, Japanese Patent Laid-Open No. 1-173080.

[0003]

[Problems to be solved by the device]

 However, in the above-described conventional fixing structure of the steering link shaft 20 and the piston 24, after the C ring 23 is mounted in one annular groove 21 formed on the outer periphery of the steering link shaft 20, the C ring 23 is attached to the C ring 23. It was necessary to abut one end 24a of the piston 24 and to crimp the other end 24b of the piston 24 to engage it in the other annular groove 22, which required a large number of work steps and was not easy.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a fixing structure for a piston and a rod, which can simultaneously improve the efficiency of cylinder assembly work and reduce the cost.

[0005]

In order to achieve the above object, a piston and rod fixing structure according to the present invention comprises a rod having an annular groove on the outer circumference, and an inner periphery fitted on the outer circumference of the rod. From an annular piston having an annular groove facing the annular groove, and a wire that is drawn between the annular grooves by rotation of at least one of the piston and the rod to axially lock the piston with respect to the rod. It will be.

[0006]

[Action]

 According to the above structure, the piston is fixed to the rod by pulling the wire between the opposing annular grooves of at least one of the piston and the rod fitted with the piston.

When the wire engages with the inner circumference of the piston and the outer circumference of the rod, the piston is locked in the axial direction of the rod via the wire.

A seal member is inserted into an annular seal mounting groove formed on the outer periphery of the piston, and the sealing member closes a window hole for wire insertion that is opened at the bottom of the seal mounting groove.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing a fixing structure of a piston and a rod, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 shows a state before starting the wire insertion having the structure of FIG. It is a sectional view shown.

Reference numeral 1 denotes a rod, and an annular groove 2 having a semicircular cross section is formed on an outer peripheral surface of the rod 1, and a wire engaging hole 3 for wire hooking which is opened at a bottom portion of the annular groove 2 is formed. There is.

Reference numeral 4 denotes an annular piston, an annular seal mounting groove 5 having a rectangular cross section is formed on the outer peripheral surface of the piston 4, and an annular groove 6 having a semicircular cross section is formed on the inner peripheral surface thereof. A wire insertion window hole 7 is formed in the piston 2 at the bottom of the seal mounting groove 5 and the annular groove 6.

Reference numeral 8 denotes a wire, which is inserted between the respective annular grooves 2 and 6 in which the piston 4 is fitted to the outer periphery of the rod 1 and which opposes each other, whereby the piston 4 is axially engaged with the rod 1. It has stopped.

In the above structure, the piston 4 is fixed to the rod 1 by fitting the piston 4 to the outer periphery of the rod 1 and exposing the wire insertion window hole 7 to the wire engagement hole 3 to form the annular groove 2. , 6 are opposed to each other, and a hooking portion 8a formed at the tip of the wire 8 is hooked in the wire engaging hole 3 through the wire insertion window portion 7 to rotate at least one of the piston 4 and the rod 1. By doing so, the wire 8 is drawn between the annular grooves 2 and 6.

When the wire 8 is formed with an appropriate length so as to be inserted over the entire length between the annular grooves 2 and 6, the piston fixing operation described above is completed by retracting the wire 8. When the wire 8 is longer than the appropriate length, the distal end of the wire 8 drawn between the annular grooves 2 and 6 reappears in the window hole 7 for inserting the wire, and the annular groove 2 on the rod 1 side. The rear end of the wire 8 may be cut so that the wire 8 fits inside.

Thus, the wire 8 is formed in a ring shape, and the inner peripheral side of the wire 8 engages with the annular groove 2 on the rod 1 side, and the outer peripheral side engages with the annular groove 6 on the piston 4 side. The piston 8 is locked in the axial direction of the rod 1 by this wire 8.

A seal member (not shown) is inserted into an annular seal mounting groove 5 formed on the outer circumference of the piston 4. This seal member closes the window hole 7 for inserting the wire, which is opened at the bottom of the seal mounting groove 5.

[0018]

[Effect of device]

 As described above, the present invention provides a rod having an annular groove on the outer periphery, an annular piston fitted on the outer periphery of the rod and having an annular groove facing the annular groove on the inner periphery, and the piston or the rod. It consists of a wire that is drawn between the annular grooves by at least one rotation and locks the piston axially with respect to the rod. Can be securely fixed.

Further, the piston can be fixed only by fitting the piston to the outer circumference of the rod and then pulling the wire between the annular grooves of both rods, as compared with the conventional C ring mounting and piston caulking. The work is easy and the number of steps is small.

Therefore, according to this invention, the efficiency of the cylinder assembly work and the cost reduction can be achieved at the same time.

[Brief description of drawings]

FIG. 1 is a sectional view showing a fixing structure of a piston and a rod according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a cross-sectional view showing a state before the wire insertion having the structure of FIG. 1 is started.

FIG. 4 is a sectional view showing a fixing structure of a piston and a rod according to a conventional example.

[Explanation of symbols]

 1 Rod 2 Annular groove 4 Piston 6 Annular groove 8 Wire

Claims (1)

[Scope of utility model registration request] 1. A rod having an annular groove on the outer circumference, an annular piston fitted on the outer circumference of the rod and having an annular groove facing the annular groove on the inner circumference, and at least one of the piston and the rod. And a rod that is pulled between the annular grooves by the rotation of the wire to lock the piston in the axial direction with respect to the rod.