CN214998592U - Locking device for variable rod of axial plunger variable motor - Google Patents

Abstract

The utility model discloses an axial plunger variable motor variable rod locking device, including axial plunger variable motor, variable rod and end cover, and be threaded connection, its characterized in that between variable rod and the end cover: the variable rod is provided with a shaft shoulder, the inner side of the end cover is provided with a ring groove, and a steel wire check ring is arranged between the ring groove and the shaft shoulder. The utility model discloses an improve variable rod structure and assembly relation, install the steel wire retaining ring additional between variable rod and end cover for there is spacing the relation that compresses tightly in variable rod axial direction and end cover, under the low temperature operating mode, guarantees that the variable rod can not take off because of the dual function of material shrinkage and vibration and take off, thereby can effectual solution variable motor problem that variable mechanism takes off under the low temperature operating mode. The utility model has the characteristics of can effectively prevent variable quantity pole emergence not hard up.

Description

Locking device for variable rod of axial plunger variable motor

Technical Field

The utility model relates to an axial plunger variable motor variable rod, especially an axial plunger variable motor variable rod locking device.

Background

The axial plunger motor is a commonly used actuating element in a hydraulic transmission system, has the characteristics of compact structure, small radial size, light weight, fast dynamic response, wide speed regulation range and the like, and is widely applied to high-speed and high-precision hydraulic control systems of engineering machinery, agricultural machinery, aerospace and the like. However, under the low temperature condition, the variable mechanism thereof can loosen or even separate the variable rod under the dual actions of cold contraction and vibration, which seriously affects the control precision of the axial variable motor and the reliability of the motor. Therefore, the prior art has the problem that the variable rod is easy to loosen.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an axial plunger variable displacement motor variable displacement pole locking device. The utility model has the characteristics of can effectively prevent variable quantity pole emergence not hard up.

The technical scheme of the utility model: the utility model provides an axial plunger variable motor variable rod locking device, includes axial plunger variable motor, variable rod and end cover, and is threaded connection, its characterized in that between variable rod and the end cover: the variable rod is provided with a shaft shoulder, the inner side of the end cover is provided with a ring groove, and a steel wire check ring is arranged between the ring groove and the shaft shoulder.

In the variable rod locking device of the axial plunger variable motor, the end cover is further provided with a dismounting groove.

In the variable rod locking device of the axial plunger variable motor, an arc-shaped transition surface is arranged between the bottom of the shaft shoulder on the matching side of the steel wire retainer ring and the variable rod.

Compared with the prior art, the utility model discloses an improve variable pole structure and assembly relation, install the steel wire retaining ring additional between variable pole and end cover for there is spacing compressing tightly relation variable pole axial direction and end cover, under the low temperature operating mode, guarantee that the variable pole can not take off because of the dual function of material shrinkage and vibration and take off, thereby can effectual solution variable motor problem that variable mechanism takes off under the low temperature operating mode, can extensively be used for engineering machinery, agricultural machinery, all being equipped with axial plunger variable motor in each field such as aerospace and have the system of low temperature operating mode. The utility model discloses avoided under the low temperature operating mode variable pole pine to take off the motor control accuracy and the reliability reduction scheduling problem that leads to, had advantages such as the reliability is high, simple structure, maintainability are good. To sum up, the utility model has the characteristics of can effectively prevent variable pole emergence not hard up.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a structural view of a variable rod;

FIG. 3 is an exterior view of the end cap;

fig. 4 is a structural view of the ring groove.

The labels in the figures are: 1-axial plunger variable motor, 2-variable rod, 3-steel wire retainer ring, 4-end cover, 5-shaft shoulder, 6-ring groove and 7-assembling groove.

Detailed Description

The following description is made with reference to the accompanying drawings and examples, but not to be construed as limiting the invention.

Examples are given. The utility model provides an axial plunger variable motor variable rod locking device, constitutes as shown in fig. 1-4, including axial plunger variable motor 1, variable rod 2 and end cover 4, and be threaded connection between variable rod 2 and the end cover 4, its characterized in that: the variable rod 2 is provided with a shaft shoulder 5, the inner side of the end cover 4 is provided with an annular groove 6, and a steel wire retainer ring 3 is arranged between the annular groove 6 and the shaft shoulder 5.

The end cover 4 is also provided with a dismounting groove 7.

An arc-shaped transition surface is arranged between the bottom of the shaft shoulder 5 positioned on the matching side of the steel wire retainer ring 3 and the variable rod 2.

As shown in fig. 1 to 3, a variable rod of the variable motor is connected with an end cover through threads, a steel wire retainer ring is installed in a ring groove of the end cover, the outer side of a shaft shoulder of the variable rod is matched with a step surface of the end cover, and the inner end of the variable rod is matched with the steel wire retainer ring, so that the axial positioning of the variable rod is realized, and in order to enable the steel wire retainer ring to be conveniently disassembled and assembled, an assembling and disassembling groove is processed at the assembling position of the end cover and the variable rod.

In actual work, under the low temperature operating mode, because the shrinkage of different degrees can take place for variable rod and end cover, and the temperature is lower, and the shrinkage effect is also bigger for variable rod and end cover screw-thread fit take place to become flexible, and in addition the variable motor itself has periodic vibration, and the variable rod has the trend of breaking away from the end cover in axial direction. When the matching threads of the variable rod and the end cover are loosened, the displacement of the variable rod in the axial direction can directly cause the displacement of the motor to be changed, so that the actual displacement of the variable motor is inconsistent with the expected displacement of the host, and the control precision of the hydraulic control system is reduced; meanwhile, because an included angle exists between the direction of acting force borne by the variable rod in the variable process and the axial direction, the loose of the threads can lead to the bad stress condition of the variable rod, and even lead to the release of the variable rod in severe conditions so as to lock the variable motor. After the variable rod shaft shoulder is provided with the steel wire check ring, after the threaded fit is loosened at low temperature, the variable rod and the end cover are prevented from loosening due to the limiting effect of the steel wire check ring on the variable rod, and therefore the reliability of the variable motor is improved.

Claims (3)

1. The utility model provides an axial plunger variable motor variable rod locking device, includes axial plunger variable motor (1), variable rod (2) and end cover (4), and is threaded connection, its characterized in that between variable rod (2) and end cover (4): the variable rod (2) is provided with a shaft shoulder (5), the inner side of the end cover (4) is provided with an annular groove (6), and a steel wire check ring (3) is arranged between the annular groove (6) and the shaft shoulder (5).

2. The axial plunger variable displacement motor variable displacement rod locking device of claim 1, wherein: the end cover (4) is also provided with a dismounting groove (7).

3. The axial plunger variable displacement motor variable displacement rod locking device of claim 1, wherein: an arc-shaped transition surface is arranged between the bottom of the shaft shoulder (5) positioned at the matching side of the steel wire retainer ring (3) and the variable rod (2).

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