A new type of variable structure of hydraulic motor

Abstract

The utility model discloses a novel variable structure of a hydraulic motor, including a variable adjustment assembly, the variable adjustment assembly including a variable housing; the variable housing is provided with a control channel, the variable housing is provided with a guide channel vertically connected to the control channel, the outer port of the guide channel is provided with an arc groove, a pull head is slidably provided in the guide channel, the control channel is divided into a balance cavity and a control cavity by the pull head, the control cavity is provided with a variable control execution component, the variable control execution component is connected with the pull head, and the variable control execution component can change the pull head position; the outer wall of the variable housing is provided with a magnetic detection strip, the end of the pull head in the control channel is provided with a magnet, and the variable housing is made of non-magnetic conductive material. The utility model improves the accuracy of pull head position detection, effectively shortens the variable response time of the hydraulic motor, and also solves the problems that the variable mechanism is easy to get stuck, the piston pull head is difficult to assemble, and the control piston is easy to deform, which affect the stability and reliability of the hydraulic motor.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic motors, in particular to a novel variable structure of a hydraulic motor. Background Art

[0002] The variable displacement structure of the hydraulic motor is an important working mechanism of the motor. The motor is variable by pushing the oil distribution plate and the cylinder body through the plunger, and the oil pressure on the other side of the plunger assembly is adjusted by the control valve to keep the displacement of the hydraulic motor stable.

[0003] The rationality of the design of the variable mechanism directly affects the flow stability and reliability of the motor. At present, the variable mechanism mostly determines the pulling head position by setting a spring and judging the pulling head position by pressure changes. The pressure sensor is set inside the variable mechanism. When the pressure sensor is damaged, it needs to be disassembled and replaced, which is time-consuming and labor-intensive. Utility Model Content

[0004] In view of the above-mentioned defects in the prior art, the purpose of the utility model is to provide a new type of hydraulic motor variable structure.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A novel variable structure of a hydraulic motor includes a variable adjustment assembly, wherein the variable adjustment assembly includes a variable housing; the variable housing is provided with a control channel, the variable housing is provided with a guide channel vertically connected to the control channel, an arc groove is provided at the outer port of the guide channel, a pull head is slidably provided in the guide channel, the control channel is divided into a balance cavity and a control cavity by the pull head, the control cavity is provided with a variable control execution component, the variable control execution component is connected to the pull head, and the variable control execution component can change the pull head position; a magnetic detection strip is provided on the outer wall of the variable housing, a magnet is provided at the end of the pull head in the control channel, and the variable housing is made of non-magnetic conductive material.

[0007] Furthermore, the magnetic detection strip includes at least two reed switches arranged in a linear array along the control channel.

[0008] Furthermore, the magnetic detection strip includes at least two Hall sensors arranged in a linear array along the control channel.

[0009] Furthermore, the variable control execution assembly includes a screw, a plunger, a push rod, and a control piston;

[0010] Specifically, the outer diameter of the control piston changes from large to small, and the transition point is a limit step;

[0011] Specifically, the control cavity is provided with a limiting boss, the minor diameter of the control piston passes through the limiting boss, and the limiting step contacts the front end surface of the limiting boss;

[0012] Specifically, the pull head is inserted into the large diameter part of the control piston, the push rod is arranged inside the small diameter part of the control piston, and the front end of the push rod is inserted into the pull head;

[0013] Specifically, the plunger is arranged on the small-diameter end of the control piston by means of a screw, and the plunger closes the control channel.

[0014] Further, it also includes a bent-axis rotor assembly;

[0015] Specifically, the bent-axis rotor assembly includes a rotor housing, in which an oil distribution plate, a rotor cylinder, and an output shaft that are movably connected in sequence are arranged;

[0016] Specifically, the pulling head is movably hinged to the oil distribution plate at one end of the circular arc groove, and the sliding of the pulling head in the guide channel is converted into the rotation of the oil distribution plate along the circular arc groove.

[0017] Furthermore, the oil distribution plate and the rotor cylinder body move through spherical fit;

[0018] Specifically, the rotor cylinder and the output shaft are movably connected via a piston rod and a center rod;

[0019] Specifically, the piston rod, the center rod and the rotor cylinder body are matched with sliding clearance;

[0020] Specifically, the piston rod, the center rod and the output shaft are matched with a ball joint, and at least three piston rods are provided;

[0021] Specifically, a spring is arranged inside the central rod, and the spring makes the rotor cylinder body always close to the oil distribution plate.

[0022] Compared with the prior art, the utility model has the following beneficial effects:

[0023] The utility model uses a magnet and a magnetic detection strip to detect the position of the pulling head. The oil temperature of the hydraulic motor will not demagnetize the magnet. The magnetic detection strip is arranged outside for easy replacement, which increases the service life and reduces the difficulty of maintenance.

[0024] The utility model uses a Hall sensor to improve the detection accuracy of the puller head position and effectively shortens the variable response time of the hydraulic motor.

[0025] The utility model also solves the problems that affect the stability and reliability of the hydraulic motor, such as the variable mechanism is easy to get stuck, the piston dial is difficult to assemble, the control piston is easy to deform, etc., so that the product quality is improved and the stability requirements of the hydraulic system are better met; the overall performance of the structure is stable and meets the needs of mass production; at the same time, the assembly of the structure is very convenient, which greatly improves the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a novel variable structure of a hydraulic motor of the utility model;

[0027] Figure 2 It is a schematic diagram of the structure of the magnetic detection strip in Example 1 of the utility model.

[0028] In the figure: 1. screw; 2. plunger; 3. push rod; 4. control piston; 5. dial head; 6. oil distribution plate; 7. rotor cylinder; 8. piston rod; 9. center rod; 10. output shaft; 11. magnetic detection strip; 11.1. reed switch; 11.2. plug strip; 12. magnet. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] Embodiment 1:

[0031] See also Figure 1 to Figure 2 The utility model provides a novel variable structure of a hydraulic motor, including a variable adjustment assembly and a bent-axis rotor assembly. The bent-axis rotor assembly includes a rotor housing, in which an oil distribution plate 6, a rotor cylinder body 7, and an output shaft 10 are arranged. The oil distribution plate 6 and the rotor cylinder body 7 move through spherical matching, and the rotor cylinder body 7 and the output shaft 10 are movably connected through a piston rod 8 and a center rod 9.

[0032] Among them, the piston rod 8, the center rod 9 and the rotor cylinder body 7 are matched with sliding clearance, and the piston rod 8, the center rod 9 and the output shaft 10 are matched with a ball joint. At least three piston rods 8 are provided, and a spring is provided in the center rod 9. The spring ensures that the rotor cylinder body 7 is always close to the oil distribution plate 6.

[0033] The variable adjustment assembly includes a variable housing, the variable housing is provided with a control channel, the variable housing is provided with a guide channel vertically connected to the control channel, an arc groove is provided at the outer port of the guide channel, a pull head 5 is slidably arranged in the guide channel, the pull head 5 is movably hinged to the oil distribution plate 6 at one end of the arc groove, and the sliding of the pull head 5 in the guide channel is converted into the rotation of the oil distribution plate 6 along the arc groove.

[0034] The control channel is divided into a balance cavity and a control cavity by a pull head 5. The control cavity is provided with a variable control execution component, and the variable control execution component includes a screw 1, a plunger 2, a push rod 3, and a control piston 4. The outer diameter of the control piston 4 changes from large to small, and the transition point is a limiting step. The control cavity is provided with a limiting boss, and the small diameter of the control piston 4 passes through the limiting boss. The limiting step contacts the front end surface of the limiting boss, so that the control piston 4 cannot leave the control cavity. The pull head 5 is inserted into the large diameter part of the control piston 4, the push rod 3 is arranged inside the small diameter part of the control piston 4, and the pull head 5 is inserted into the front end of the push rod 3. The plunger 2 is arranged on the small diameter end of the control piston 4 through the screw 1, and the plunger 2 closes the control channel.

[0035] The screw 1, the plunger 2 and the control piston 4 are assembled together through threaded connection.

[0036] Wherein, thread fastening glue needs to be applied when the screw 1 is threadedly connected to the control piston 4.

[0037] Among them, the plunger 2 is made of high carbon steel quenched to improve wear resistance.

[0038] Among them, the top rod 3 is made of medium carbon steel through quenching and tempering to increase the hardness of the part.

[0039] Among them, the control piston 4 is made of low-carbon steel carbonitriding treatment to maintain a certain impact toughness and reduce deformation, the outer circle is ground to improve the smoothness of movement, and the hole that matches the dial head 5 is increased in tolerance.

[0040] The dial head 5 is carburized with low carbon steel, the effective hardened layer depth is 0.2-0.4mm, and the hinged part is made with a base hole with reduced tolerance.

[0041] The rotor cylinder 7 base body is made of medium carbon steel with sintered copper at the bottom, and the whole body is subjected to composite nitriding and oxidation treatment.

[0042] It should be noted that the rotor housing is not drawn in the drawings of the present invention, and the structure of the rotor housing and the connection method between the rotor housing and the variable housing are clear to those skilled in the art, such as the center plunger for the bent-axis variable motor and the new bent-axis plunger variable motor shown in publication number CN115788592A.

[0043] The outer wall of the variable housing is provided with a magnetic detection strip 11, the end of the pull head 5 in the control channel is provided with a magnet 12, and the variable housing is made of non-magnetic conductive material, such as aluminum alloy and engineering plastics.

[0044] In this embodiment, the magnetic detection strip 11 includes at least two reed switches 11.1 arranged in a linear array along the control channel, and the reed switches 11.1 are set to be normally closed or normally open. One end of the reed switches 11.1 is connected to the plug-in block 11.2, and the other end is connected to the plug-in block 11.2 respectively. The external control device is connected to the plug-in block 11.2 to read the status of all the reed switches 11.1 in the magnetic detection strip 11. The more the number of reed switches 11.1, the higher the detection accuracy of the magnetic detection strip 11.

[0045] When in use, the port of the balance cavity in the variable housing is connected to the balance oil pipe, and the port of the control cavity is connected to the control oil pipe.

[0046] When pressurized oil is introduced into the control oil pipe, the oil pressure P acts on one end of the plunger 2, pushing the plunger 2 to move through the pressure difference; the movement of the plunger 2 drives the control piston 4 to move, the control piston 4 drives the pull head 5, the pull head 5 moves in the guide channel and drives the oil distribution plate 6 to rotate, and then drives the cylinder body 7 to rotate, changing the swing angle of the piston rod 8 and thus changing the displacement of the hydraulic motor.

[0047] When the pressure oil is introduced into the balance oil pipe, the pressure oil is introduced into the other end of the plunger 2, and the pressure on both sides is equal. The control piston stops moving so that the swing angle of the piston rod 8 is fixed at a certain angle, and the displacement of the hydraulic motor is fixed accordingly to realize the basic characteristics of the variable motor;

[0048] During the movement of the puller 5, the magnet 12 changes the state of the reed switch 11.1 on the magnetic detection strip 11, so that the control system can read the puller position and thus know the swing angle of the piston rod 8.

[0049] Embodiment 2:

[0050] Based on Example 1, in this embodiment, the magnetic detection strip 11 includes at least two Hall sensors arranged in a linear array along the control channel. The Hall sensors can detect the magnetic field strength, so that the control system can more accurately determine the position of the magnet 12, thereby improving the accuracy of variable control.

[0051] All components and connection methods of components not discussed in this application belong to the known technologies in this technical field and can be directly applied without further explanation.

[0052] In the present invention, the term "plurality" means two or more than two, unless otherwise clearly defined. The terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0053] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as "up", "down", "left", "right", "front" and "back" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the present invention.

[0054] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0055] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A novel variable displacement structure of a hydraulic motor, including a variable displacement regulating assembly, characterized in that: The variable adjustment assembly includes a variable housing; The variable housing is provided with a control channel, the variable housing is provided with a guide channel vertically connected to the control channel, the outer port of the guide channel is provided with an arc groove, a pulling head is slidably provided in the guide channel, the control channel is divided into a balance cavity and a control cavity by the pulling head, the control cavity is provided with a variable control execution component, the variable control execution component is connected to the pulling head, and the variable control execution component can change the pulling head position; The outer wall of the variable housing is provided with a magnetic detection strip, the end of the pull head in the control channel is provided with a magnet, and the variable housing is made of non-magnetic conductive material.

2. A novel variable displacement structure of a hydraulic motor according to claim 1, characterized in that: The magnetic detection strip includes at least two reed switches arranged in a linear array along a control channel.

3. A novel variable displacement structure of a hydraulic motor according to claim 1, characterized in that: The magnetic detection strip includes at least two Hall sensors arranged in a linear array along a control channel.

4. A novel variable displacement structure of a hydraulic motor according to claim 1, characterized in that: The variable control execution assembly includes a screw, a plunger, a push rod, and a control piston; The outer diameter of the control piston changes from large to small, and the transition point is a limit step; The control cavity is provided with a limiting boss, the minor diameter of the control piston passes through the limiting boss, and the limiting step contacts the front end surface of the limiting boss; The pull head is inserted into the large diameter part of the control piston, the push rod is arranged inside the small diameter part of the control piston, and the front end of the push rod is inserted into the pull head; The plunger is arranged on the small-diameter end of the control piston by means of a screw, and the plunger closes the control channel.

5. A novel variable displacement structure of a hydraulic motor according to claim 1, characterized in that: Also included is a bent-axis rotor assembly; The bent-axis rotor assembly includes a rotor housing, in which an oil distribution plate, a rotor cylinder, and an output shaft are movably connected in sequence; The pulling head is movably hinged to the oil distribution plate at one end of the circular arc groove, and the sliding of the pulling head in the guide channel is converted into the rotation of the oil distribution plate along the circular arc groove.

6. A new type of hydraulic motor variable structure according to claim 5, characterized in that: The oil distribution plate and the rotor cylinder body move through spherical matching; The rotor cylinder body is movably connected to the output shaft via a piston rod and a center rod; The piston rod, the center rod and the rotor cylinder body are matched with sliding clearance; The piston rod, the center rod and the output shaft are matched with a ball joint, and at least three piston rods are provided; A spring is arranged inside the central rod, and the spring makes the rotor cylinder body always close to the oil distribution plate.

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