CN220365683U - Variable mechanism - Google Patents

Abstract

The utility model relates to the technical field of hydraulic pressure, in particular to a variable mechanism. A variable mechanism comprising: an intermediate; the variable piston is a hollow piston with one end open, and is slidably assembled in the middle body to separate a first cavity and a second cavity; the adjusting rod is assembled in an adjusting way and extends into the variable piston from the opening of the variable piston; the elastic piece is sleeved on the adjusting rod; the spring seats are two, the two spring seats are assembled on the adjusting rod in a sliding limiting mode, the elastic piece is located between the two spring seats, and the elastic piece and the two spring seats are located in the variable piston. The problems of the prior art that the adjusting device has more parts and complex structure are solved.

Description

Variable mechanism

Technical Field

The utility model relates to the technical field of hydraulic pressure, in particular to a variable mechanism.

Background

In the prior art, swash plate type axial piston machines are typically provided with a variable mechanism to adjust displacement. Generally, the variable displacement mechanism includes a variable displacement cylinder and a variable displacement piston, the variable displacement piston being axially movably accommodated in the variable displacement cylinder, the variable displacement piston driving a swash plate to deflect to adjust the displacement.

As described in DE102017211750.8, an adjusting piston for a hydrostatic adjusting device is known, with which hydrostatic adjusting device a working piston is guided out of a cylinder drum on the end face of the cylinder drum facing away from a control disk and is mounted slidably on a swash plate, with the piston head of which the angle can be adjusted relative to the axis of rotation. The swash plate is connected by means of a lever to a hydrostatic adjusting device which is arranged in the housing part, to be precise in a projection of the housing part, which projection extends substantially transversely to the axis of rotation. The adjusting device has a cylinder which is closed at its two end sections by a cylinder cover. In the cylinder, a double-acting actuating piston, which is designed symmetrically with respect to the cross section, is guided axially displaceably along the actuating axis. The pilot piston has a substantially double U-shaped or H-shaped cross-section. Accordingly, the actuating piston has a piston head which is centered in the axial direction and from which a hollow piston skirt extends toward the respective cylinder head.

The adjusting device in the application can realize the angle adjustment of the swash plate, but the spring assemblies are assembled on the two sides of the adjusting device, and the structures such as the spring seats are correspondingly configured, so that the adjusting device is more in parts and high in assembly difficulty.

Disclosure of Invention

In order to solve the technical problems of more parts and complex structure of an adjusting device in the prior art, the utility model provides a variable mechanism, and solves the technical problems.

In order to solve the above technical problems, the present utility model provides a variable mechanism, including:

an intermediate;

the variable piston is a hollow piston with one end open, and is slidably assembled in the middle body to separate a first cavity and a second cavity;

the adjusting rod is assembled in an adjusting way and extends into the variable piston from the opening of the variable piston;

the elastic piece is sleeved on the adjusting rod;

the two spring seats are respectively a first spring seat and a second spring seat, the two spring seats are assembled on the adjusting rod in a sliding limiting mode, the elastic piece is located between the two spring seats, the elastic piece and the two spring seats are located in the variable piston, and the first spring seat is arranged close to the inner bottom surface of the variable piston;

the limiting sleeve is sleeved on the adjusting rod and is positioned between the first spring seat and the second spring seat;

the limiting piece is arranged on the adjusting rod to limit the second spring seat, the position of the limiting piece on the adjusting rod is adjustable, the limiting piece comprises at least two locking nuts, and the at least two locking nuts can be matched and locked on the adjusting rod.

According to one embodiment of the utility model, one end of the first spring seat is slidably assembled on the adjusting rod and limited by the end part of the adjusting rod, and the other end of the first spring seat is in contact with the inner bottom surface of the variable piston.

According to one embodiment of the utility model, a stopper is arranged at the opening of the variable piston, and in an initial state, the second spring seat is in contact with the stopper.

According to one embodiment of the utility model, through hole mounting holes are formed on the intermediate body for assembling the variable piston, end covers are respectively fixed at two ends of the intermediate body, and the adjusting rod is assembled on one end cover.

According to one embodiment of the utility model, the adjusting rod is a screw rod, the adjusting rod is assembled on the end cover in a threaded manner, the sealing nut locks the adjusting rod, and the axis of the adjusting rod is collinear with the axis of the through hole mounting hole.

According to one embodiment of the utility model, the middle part of the variable piston drives the swashplate to deflect, and two ends of the variable piston are in sealing sliding fit with the inner wall of the through hole mounting hole.

According to one embodiment of the utility model, a groove is formed in the middle of the variable piston, the sloping cam plate is connected with a stirring piece, and the stirring piece stretches into the groove.

Based on the technical scheme, the utility model has the following technical effects:

according to the variable mechanism, the variable piston is a hollow piston with one end open, only one elastic piece is needed to be arranged in the variable piston, and two corresponding spring seats are arranged for the elastic piece, so that hydraulic oil enters the first cavity or the second cavity to push the variable piston to slide in two directions from a central position, and then the swash plate is driven to deflect in two directions to adjust the displacement. The variable mechanism can adjust the angle of the sloping cam plate, simplify the arrangement of the structure at the same time, reduce the number of parts and assembly difficulty;

according to the variable mechanism, the limiting sleeve is sleeved on the adjusting rod, so that the sliding range of the variable piston along two directions can be limited by the limiting sleeve in a matched mode, the sliding range of the variable piston from the center position to the two directions is consistent, and the angle range of deflection of the swash plate from the zero position to the two sides is consistent;

in the variable mechanism, in an initial state, one end of a first spring seat is limited by the end part of the inner end of an adjusting rod, and the other end of the first spring seat is contacted with the inner bottom surface of a variable piston; the second spring seat is limited by the limiting piece and is contacted with the blocking piece at the opening of the variable piston at the same time, so that the balance state is achieved, and the variable piston can slide to the bottom when sliding from the center position to the two sides; the limiting piece comprises at least two locking nuts, so that the position of the second spring seat can be adjusted by adjusting the positions of the locking nuts, and further the second spring seat is contacted with the blocking piece at the opening of the variable piston without force;

according to the variable mechanism, the adjusting rod is arranged to be a screw rod, and the variable piston and the elastic piece and the two spring seats in the variable piston can be driven to move together by rotating the adjusting rod, so that the central position of the variable piston is aligned with the zero position of the swash plate, and zero setting is performed.

Drawings

FIG. 1 is a cross-sectional view of a variable mechanism of the present utility model;

FIG. 2 is an enlarged view of a portion of the variable mechanism;

FIG. 3 is a schematic view of the variable mechanism with the intermediate removed;

in the figure: 1-an intermediate; 11-a first cavity; 12-a second chamber; 2-variable piston; 21-grooves; 22-stop; 23-metal rings; 24-sealing rings; 3-adjusting the rod; 31-end projections; 32-sealing the nut; 4-elastic members; 5-spring seat; 51-a first spring seat; 52-a second spring seat; 6-limiting sleeve; 7-limiting pieces; 71-a first lock nut; 72-a second lock nut; 81-a first end cap; 82-a second end cap; 9-a swash plate; 10-a toggle piece; 101-a cylindrical pin; 102-slider.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present utility model unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present utility model, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present utility model; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present utility model.

As shown in fig. 1-3, this embodiment provides a variable mechanism, which includes an intermediate body 1 and a variable piston 2, wherein a mounting hole is formed in the intermediate body 1, the variable piston 2 is slidably assembled in the mounting hole, and the variable piston 2 slides in the intermediate body 1 to drive a swash plate 9 to deflect, so as to adjust the displacement.

The intermediate body 1 is enclosed outside the swash plate 9 and extends to one side of the swash plate 9, a mounting hole is formed in a portion of the intermediate body 1 extending to one side of the swash plate 9, and the variable piston 2 is fitted in the mounting hole. Specifically, the mounting hole is a through hole mounting hole, and the two ends of the intermediate body 1 are respectively fixed with an end cover, specifically, one end of the intermediate body 1 is fixed with a first end cover 81, the other end of the intermediate body 1 is fixed with a second end cover 82, and the two ends of the mounting hole are closed by the first end cover 81 and the second end cover 82.

As a preferable solution of the present embodiment, the variable piston 2 is slidably fitted in the mounting hole, and the variable piston 2 partitions the mounting hole into a first chamber 11 and a second chamber 12.

As the preferable technical scheme of the embodiment, the middle part of the mounting hole is communicated with the space where the swash plate 9 is positioned, so that the variable piston 2 conveniently drives the swash plate 9 to deflect.

The variable piston 2 is slidably assembled in the mounting hole, the variable piston 2 is a hollow piston with one end open, the middle part of the outer surface of the variable piston 2 is linked with the swash plate 9, and the outer surfaces of the two ends of the variable piston 2 are in sealing sliding fit with the inner wall of the mounting hole.

As a preferable technical scheme of the embodiment, a groove 21 is formed in the middle of the variable piston 2, the stirring piece 10 can extend into the groove 21, and the variable piston 2 drives the swash plate 9 to deflect through the stirring piece 10. Preferably, the recess 21 is an annular recess.

As a preferred technical solution of this embodiment, both ends of the variable piston 2 are respectively equipped with a metal ring 23 and a sealing ring 24, and when the variable piston 2 slides, the sealing effect can be ensured.

The variable displacement mechanism further comprises an adjusting rod 3, the adjusting rod 3 is adjustably assembled on one end cover, and the inner end part of the adjusting rod 3 extends from the opening of the variable displacement piston 2 to the inside of the variable displacement piston 2.

As a preferable technical scheme of the embodiment, the adjusting rod 3 is a screw rod, the adjusting rod 3 can be assembled on the first end cover 81 in a threaded manner, the adjusting rod 3 can rotate to adjust the position, and after the adjusting rod is adjusted in place, the sealing nut 32 is used for locking the position of the adjusting rod 3.

As a preferable technical scheme of the embodiment, an end protrusion 31 is formed at the end of the inner end of the adjusting rod 3 extending into the variable piston 2 for limiting.

As a preferable technical solution of the present embodiment, the axis of the adjusting rod 3, the axis of the variable piston 2 and the axis of the mounting hole are collinear.

The elastic piece 4 is arranged on the adjusting rod 3 in a limiting mode, specifically, the elastic piece 4 is sleeved on the adjusting rod 3, the elastic piece 4 is located inside the variable piston 2, the adjusting rod 3 slides on the adjusting rod and is provided with two spring seats 5 in a limiting mode, the number of the spring seats 5 is two, the elastic piece 4 is located between the two spring seats 5, and two ends of the elastic piece 4 respectively lean against the two spring seats 5. The elastic member 4 is optionally but not limited to a spring.

As a preferable technical solution of the present embodiment, the two spring seats 5 are a first spring seat 51 and a second spring seat 52, respectively, the first spring seat 51 and the second spring seat 52 are both located inside the variable piston 2, and the first spring seat 51 is disposed closer to the inner bottom surface of the variable piston 2 than the second spring seat 52.

As a preferable technical solution of this embodiment, in the initial state, one end of the first spring seat 51 is slidably assembled on the adjusting rod 3, the first spring seat 51 may be limited by the end protrusion 31 at the inner end of the adjusting rod 3, and the second end of the second spring seat 52 extends axially inward to contact with the inner bottom surface of the variable piston 2.

As a preferable technical solution of the present embodiment, the second spring seat 52 is slidably assembled on the adjusting rod 3, the second spring seat 52 is limited by the limiting member 7, and the limiting member 7 is assembled on the adjusting rod 3. In the initial state, the limiting piece 7 can limit the position of the second spring seat 52, and meanwhile, the second spring seat 52 is in contact with the blocking piece 22 at the opening of the variable piston 2, but no acting force exists between the second spring seat 52 and the blocking piece. Preferably, the limiting member 7 comprises at least two locking nuts which can be locked on the adjusting rod 3 in a matching manner. In this embodiment, the limiting member 7 includes a first lock nut 71 and a second lock nut 72, the first lock nut 71 and the second lock nut 72 are located on the other side of the second spring seat 52 away from the elastic member 4, and in the initial state, the second spring seat 52 abuts against the first lock nut 71. Preferably, the stop 22 at the opening of the variable displacement piston 2 is optionally, but not limited to, a circlip for a hole.

A limiting sleeve 6 is further arranged between the first spring seat 51 and the second spring seat 52, the limiting sleeve 6 is slidably sleeved on the adjusting rod 3, gaps exist between two ends of the limiting sleeve 6 and the first spring seat 51 and/or the second spring seat 52, and the sliding range of the variable piston 2 in the intermediate body 1 can be limited by controlling the axial length of the limiting sleeve 6.

The variable piston 2 drives the swash plate 9 to deflect through the toggle piece 10, the toggle piece 10 comprises a cylindrical pin 101 and a sliding block 102, the cylindrical pin 101 is fixed at the edge of the swash plate 9, the sliding block 102 is assembled on the cylindrical pin 101, and the sliding block 102 extends into the groove 21 of the variable piston 2. Preferably, the slider 102 is rotatably mounted on the cylindrical pin 101.

Based on the above-described structure, in the variable mechanism of the present embodiment, in the initial state, the variable piston 2 is located in the middle of the mounting hole, the first spring seat 51 is limited by the end protrusion 31 of the adjustment lever 3, and at the same time, the first spring seat 51 is in contact with the inner bottom surface of the variable piston 2; the second spring seat 52 is restrained by the retainer 7 while the second spring seat 52 is in contact with the stopper 22 at the opening of the variable piston 2 but without a force. The swash plate 9 is in zero position and the displacement is zero.

When the displacement is regulated, hydraulic oil enters into the first cavity or the second cavity, the variable piston 2 is pushed to slide, and the variable piston 2 drives the swash plate 9 to deflect through the toggle piece 10.

The position of the variable piston 2 can be adjusted by adjusting the position of the adjusting rod 3, so that the middle part of the variable piston 2 is exactly aligned with the zero position of the swash plate 9 in the initial state; the position of the limiting piece 7 can be adjusted, the first spring seat 51 and the second spring seat 52 can be guaranteed to be limited in the variable piston 2 and contact with the variable piston 2, the two spring seats and the elastic piece 4 in the middle are guaranteed to be in a balanced state, the variable piston 2 can move in the same stroke in two directions, and the swash plate 9 can deflect in two directions.

The embodiments of the present utility model have been described in detail with reference to the drawings, but the present utility model is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present utility model.

Claims (7)

1. A variable mechanism, comprising:

an intermediate (1);

the variable piston (2) is a hollow piston with one end open, and the variable piston (2) is slidably assembled in the intermediate body (1) to separate a first cavity (11) and a second cavity (12);

the adjusting rod (3) is assembled in an adjusting way, and the adjusting rod (3) extends into the variable piston (2) from the opening of the variable piston (2);

the elastic piece (4) is sleeved on the adjusting rod (3);

the two spring seats (5) are respectively a first spring seat (51) and a second spring seat (52), the two spring seats (5) are assembled on the adjusting rod (3) in a sliding limiting mode, the elastic piece (4) is located between the two spring seats (5), the elastic piece (4) and the two spring seats (5) are located in the variable piston (2), and the first spring seat (51) is close to the inner bottom surface of the variable piston (2);

the limiting sleeve (6) is sleeved on the adjusting rod (3), and the limiting sleeve (6) is positioned between the first spring seat (51) and the second spring seat (52);

the limiting piece (7), limiting piece (7) are arranged on the adjusting rod (3) so as to limit the second spring seat (52), the position of the limiting piece (7) on the adjusting rod (3) is adjustable, the limiting piece (7) comprises at least two locking nuts, and the at least two locking nuts can be matched and locked on the adjusting rod (3).

2. A variable mechanism according to claim 1, wherein one end of the first spring seat (51) is slidably fitted on the adjusting rod (3) and is restrained by an end portion of the adjusting rod (3), and the other end of the first spring seat (51) is in contact with an inner bottom surface of the variable piston (2).

3. A variable mechanism according to any one of claims 1-2, characterized in that the opening of the variable piston (2) is provided with a stop (22), and in an initial state the second spring seat (52) is in contact with the stop (22).

4. A variable mechanism according to claim 1, wherein the intermediate body (1) is formed with through-hole mounting holes for assembling the variable pistons (2), end caps are respectively fixed to both ends of the intermediate body (1), and the adjusting rod (3) is assembled to one of the end caps.

5. A variable displacement mechanism according to claim 4, wherein the adjustment rod (3) is a screw rod, the adjustment rod (3) is screw-fitted on the end cap, a seal nut (32) locks the adjustment rod (3), and the axis of the adjustment rod (3) is collinear with the axis of the through-hole mounting hole.

6. A variable mechanism according to claim 4, wherein the middle part of the variable piston (2) drives the swashplate (9) to deflect, and two ends of the variable piston (2) are in sealing sliding fit with the inner wall of the through hole mounting hole.

7. A variable mechanism according to claim 6, characterized in that a groove (21) is formed in the middle of the variable piston (2), the swash plate (9) is connected with a toggle member (10), and the toggle member (10) extends into the groove (21).