A control device for a hydraulic motor

Abstract

The application discloses a control device of a hydraulic motor, which comprises a shell, a control switch arranged in the shell, an adjusting part for adjusting the control switch, and a filter arranged above the control switch. The shell is internally formed with a first mounting cavity for accommodating the control switch, a second mounting cavity for accommodating the adjusting part, and a third mounting cavity for accommodating the filter. The third mounting cavity is arranged above the first mounting cavity and communicates with the first mounting cavity, so that oil liquid acts on the control switch after passing through the filter. The control switch comprises a valve core and an elastic part abutting against the valve core. The adjusting part abuts against the elastic part and can rotate to drive the elastic part to stretch and contract, so as to adjust the pre-tightening force of the control switch. By arranging the filter in the control device, the oil liquid can enter the valve core after being filtered by the filter, the cleanliness of the oil liquid entering the valve core is ensured, the maintenance period of the hydraulic motor is prolonged, and the maintenance cost is reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of hydraulic motors, and particularly relates to a control device of a hydraulic motor. BACKGROUND

[0002] The existing motor controller comprises a housing arranged outside, a gland arranged on the housing, a valve core arranged in the housing, and a spring arranged between the valve core and the gland, the opening or closing of the valve core is controlled by the action of the oil gravity, when the oil enters the valve core, the spring is pressed downward under the action of the oil pressure to realize the opening of the valve core. At the same time, in order to change the displacement of the hydraulic motor with the change of the working condition, an adjusting member for adjusting the spring pre-tightening force is usually arranged, for example, a variable control mechanism of a hydraulic inclined shaft motor disclosed in application No. 201310737400.6, the adjusting screw rod is arranged obliquely on one side of the hydraulic motor controller, and one end abuts against the second spring, the compression amount of the second spring is controlled by controlling the adjusting screw rod, thereby the compression amount of the first spring abutting against the second spring is controlled, and the pushing force of the valve core is adjusted, when the compression amount of the first spring is large, the pushing force of the first spring on the valve core is large, and the valve core cannot be opened when the oil is less, and the valve core can be opened only when the oil is more, and since the oil supply is stable, the opening of the valve core is small at this time; when the compression amount of the first spring is small, the compression amount of the first spring is small, and the pushing force of the first spring on the valve core is small, and the valve core can be opened even when the oil is less, and the opening of the valve core is large at this time.

[0003] However, the adjusting screw rod arranged obliquely applies the pushing force of the spring to one side of the spring, and the force balance of the spring cannot be guaranteed, so the compression path of the spring needs to be guaranteed by tightly matching the housing and the valve core, and since the matching gap between the valve core and the housing is small, the valve core is easily stuck by impurities between the valve core and the housing, the controller is stuck, and the normal use of the motor is affected. Since the scene of the use of the hydraulic motor is complex, the cleanliness of the oil cannot be guaranteed during use, and therefore, a motor controller with automatic filtering effect needs to be designed. SUMMARY

[0004] The application provides a control device of a hydraulic motor to solve the technical problems of the above motor controller, the matching gap between the valve core and the housing is small to guarantee the compression path of the spring, the valve core is stuck by impurities between the valve core and the housing, the controller is stuck, and the normal use of the motor is affected.

[0005] The technical scheme adopted in the application is as follows: a control device of a hydraulic motor, comprising a shell, a control switch arranged in the shell, an adjusting part for adjusting the control switch, and a filter arranged above the control switch; a first mounting cavity for accommodating the control switch, a second mounting cavity for accommodating the adjusting part, and a third mounting cavity for accommodating the filter are formed in the shell; the third mounting cavity is arranged above the first mounting cavity and communicates with the first mounting cavity, so that oil liquid acts on the control switch after passing through the filter; the control switch comprises a valve core and an elastic part abutting against the valve core; the adjusting part abuts against the elastic part and is rotatable to drive the elastic part to stretch and contract, so as to adjust the pre-tightening force of the control switch.

[0006] The control device of the hydraulic motor in the application further has the following additional technical features:

[0007] An oil liquid passage for the oil liquid to pass through is formed between the outer wall of the filter and the inner wall of the third mounting cavity; the filter is provided with a flow-limiting protrusion abutting against the inner wall of the third mounting cavity; the inside of the filter is provided with a flow hole; a flow passage is connected between the oil liquid passage and the flow hole, and the diameter of the flow passage is smaller than the diameters of the oil liquid passage and the flow hole.

[0008] A plurality of flow-limiting protrusions are arranged along the axial direction of the filter, and a filtering protrusion is arranged between each of the flow-limiting protrusions; the filtering protrusion and the inner wall of the mounting cavity have a gap for the oil liquid to pass through.

[0009] A group of filtering protrusions is arranged between each two flow-limiting protrusions; each group of flow-limiting protrusions comprises a plurality of flow-limiting protrusions; and the gap between each flow-limiting protrusion in each group and the mounting cavity is different.

[0010] A plurality of flow holes are arranged along the axial direction of the filter; and the plurality of flow holes communicate through the flow passage.

[0011] The adjusting part comprises a support rod and a control part abutting against the control switch; the control part is arranged at an eccentric position of the support rod; one end of the support rod is connected to the control part and protrudes into the second mounting cavity; and the other end of the support rod protrudes outside the shell, so as to adjust the position of the control part.

[0012] The elastic part comprises a spring sleeved on the valve core and a spring seat arranged around the outer wall of the spring; the spring seat is provided with a limiting hole with the same diameter as the control part; and the control part is inserted into the limiting hole to adjust the pre-tightening force of the spring.

[0013] The bottom wall of the spring seat is inwardly recessed to form an abutting portion, and an inner diameter of the abutting portion is smaller than an outer diameter of the spring.

[0014] The control device further comprises a limiting piece, a gasket is arranged at a position where the support rod abuts against the shell, and the limiting piece abuts against the gasket to fix the support rod on the second mounting cavity.

[0015] The shell is further provided with a throttling hole, the throttling hole comprises a first throttling hole arranged on the upper part of the control switch and a second throttling hole arranged on the bottom of the shell, and a hole diameter of the first throttling hole is larger than a hole diameter of the second throttling hole.

[0016] Thanks to the above technical solutions, the application has the following beneficial effects:

[0017] 1. The control device is provided with a filter element, so that the oil liquid can enter the valve core after being filtered by the filter element, and impurities can be blocked outside the valve core by the filter element. Since the gap between the filter element and the shell is small, the impurities in the oil liquid cannot cause wear and damage to the valve core, and the control device cannot work due to jamming, which can cause the hydraulic motor to malfunction. The cleanliness of the oil liquid entering the valve core is ensured, which can prolong the maintenance period of the hydraulic motor, reduce the maintenance cost, prolong the service life of the control device, and ensure the normal work of the hydraulic motor. The adjusting element abuts against the elastic element and can be rotated to drive the spring element to stretch and contract, so as to adjust the size of the pre-tightening force of the elastic assembly. The valve core can realize the effect of adjusting the control starting point according to different pre-tightening forces. On the one hand, the pre-tightening force of the elastic element is adjusted by rotating the adjusting element, which can avoid the situation that the angle between the elastic element and the adjusting element cannot guarantee the stress position and displacement position of the spring, so as to guarantee the displacement of the elastic element. The elastic element and the valve core do not need to be limited by the second mounting cavity, so that a certain gap can be left between the valve core and the side wall of the first mounting cavity, which can further avoid the situation that the impurities in the oil liquid cause wear and damage to the filter element and the side wall of the first mounting cavity, and further prolong the service life of the control device. On the other hand, compared with the telescopic screw in the prior art, the adjusting element only needs to be fixed at a suitable position to adjust the size of the pre-tightening force of the elastic element, without the need to change the position of the adjusting element by stretching and contracting. The adjusting element is not convenient to pull out due to the excessive part of the adjusting element extending into the second mounting cavity and the insufficient part of the adjusting element outside the second mounting cavity, which simplifies the process of controlling the valve core and the structure of the control device.

[0018] 2. The application sets the filter with a flow limiting protrusion abutting the inner wall of the third mounting cavity, sets a flow hole in the inside of the filter, and communicates a flow passage between the oil passage and the flow hole. When hydraulic pressure enters the oil passage, the flow limiting protrusion abuts the inner wall of the third mounting cavity, preventing the passage of oil. The oil enters the flow passage, and because the diameter of the flow passage is smaller than the diameters of the oil passage and the flow hole, impurities in the oil entering the flow passage cannot pass through the diameter of the flow passage to enter the flow hole and the spool, thereby avoiding the situation that impurities entering the spool cause the control switch to jam and the hydraulic motor to malfunction. At the same time, the diameters of the flow hole and the flow groove are set to be greater than the diameter of the flow passage, ensuring smooth passage of the oil and avoiding the situation that too small a flow passage diameter results in too little oil passing through, ensuring the reliability of the control device.

[0019] 3. The application sets the flow limiting protrusion with multiple flow limiting protrusions, and sets a filter protrusion between each flow limiting protrusion. The filter protrusion can filter the oil again, avoiding the possibility of the oil entering the spool through the flow passage, so that the filter protrusion can filter the oil again, thereby ensuring the filtering effect of the filter, further avoiding the situation that impurities in the oil enter the spool causing the control switch to jam and the hydraulic motor to malfunction, ensuring the reliability of the hydraulic motor.

[0020] 4. The application sets the filter protrusion with multiple filter protrusions, further avoiding the possibility of impurities in the oil entering the spool through the filter, ensuring that the filter can effectively filter impurities in the oil, further improving the filtering effect of the filter, so that the filter can more effectively protect the spool from damage by oil impurities, thereby further ensuring the reliability of the hydraulic motor.

[0021] 5. The application sets the flow hole with multiple flow holes, increasing the path of the flow passage, reducing the probability of impurities entering the spool through the filter, so that the filtering effect of the filter is better, further improving the filtering effect of the filter, more effectively avoiding the possibility of impurities entering the spool through the filter, further protecting the spool from impurities, thereby ensuring the normal operation of the hydraulic motor.

[0022] 6. The application sets the adjusting member to include a support rod and a control part abutting the control switch, and the control part is arranged at an eccentric position, so that the control part has an upper axial position and a lower axial position relative to the support rod in the longitudinal direction. When the pre-tightening force of the spring needs to be adjusted, the support rod is rotated to change the position of the control part. When the pre-tightening force of the elastic member needs to be large, the control part is rotated to the upper position, so that the elastic member is kept in a compressed state. When the pre-tightening force of the elastic member needs to be small, the control part is rotated to the lower position, so that the elastic member is in a relaxed state. In this way, the pre-tightening force of the spring is adjusted. Compared with the prior art, the position of the elastic member does not need to be adjusted, which avoids the situation that the part of the support rod outside the second mounting cavity is too small to make it inconvenient or even impossible to pull out the support rod, simplifies the step of adjusting the pre-tightening force of the elastic member by the adjusting member, and ensures the reliability of the adjusting member.

[0023] 7. The application sets the spring assembly to include a spring and a spring seat sleeved around the outer wall of the spring, and the control member is inserted into the limiting hole of the spring seat. When the support rod is rotated, the position of the control member changes accordingly. When the position of the control member is lower, the position of the spring seat is also lower, so the spring is in the original state, at this time, the pre-tightening force of the spring is small, the opening of the control device is large, and the flow is large. When the position of the control member is higher, the spring seat is displaced upward under the driving of the control member, the spring is compressed, and the pre-tightening force of the spring is large, so the opening of the control device is small, and the flow is small. By rotating the support rod, the pre-tightening force of the spring is adjusted. Compared with the prior art, the support rod does not change its position when it is rotated, which ensures that the support rod is always located at a fixed position, avoids the situation that the support rod is completely immersed in the shell and is inconvenient or even impossible to stretch, which leads to the inability to adjust the pre-tightening force of the spring, and further ensures the reliability of the adjusting member. BRIEF DESCRIPTION OF DRAWINGS

[0024] The drawings described herein are used to provide further understanding of the application, and form a part of the application. The illustrative embodiments of the application and their descriptions are used to explain the application, and do not constitute an improper limitation on the application. In the drawings:

[0025] Figure 1 It is a structure schematic view of the control device in an embodiment of the application;

[0026] Figure 2Another angle of the structure of the control device in one embodiment of the application is shown in the figure.

[0027] Figure 3 Another angle of the structure of the control device in one embodiment of the application is shown in the figure.

[0028] Figure 4 Another angle of the structure of the control device in one embodiment of the application is shown in the figure.

[0029] 1 - housing, 11 - first mounting cavity, 12 - second mounting cavity, 13 - third mounting cavity, 14 - throttle hole, 141 - first throttle hole, 142 - second throttle hole; 2 - control switch, 21 - valve core, 22 - elastic member, 221 - spring, 222 - spring seat; 3 - adjusting member, 31 - support rod, 32 - control part, 33 - limiting member, 34 - gasket; 4 - filter member, 41 - flow limiting protrusion, 42 - flow hole, 43 - filter protrusion; 5 - control plunger cavity. DETAILED DESCRIPTION

[0030] In order to more clearly illustrate the overall concept of the application, the following will be described in detail with reference to the accompanying drawings.

[0031] In the following description, many specific details are set forth in order to provide a thorough understanding of the application, but the application can also be practiced in other ways different from those described herein, therefore, the scope of protection of the application is not limited by the specific embodiments disclosed below.

[0032] In addition, in the description of the application, it should be understood that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation of the application.

[0033] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection, or communication; it can be directly connected, or indirectly connected through intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] In this application, unless otherwise explicitly specified and limited, a first feature is "on" or "under" a second feature can mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. In the description of the specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the description of the specification, the illustrative description 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 appropriate manner in any one or more embodiments or examples.

[0035] As shown in Figures 1 to 3 The control device of the hydraulic motor disclosed in the present application comprises a housing 1, a control switch 2 arranged in the housing 1, an adjusting part 3 for adjusting the control switch 2, and a filter part arranged above the control switch 2. The housing 1 is internally formed with a first mounting cavity 11 for accommodating the control switch 2, a second mounting cavity 12 for accommodating the adjusting part 3, and a third mounting cavity 13 for accommodating the filter part. The third mounting cavity 13 is arranged above the first mounting cavity 11 and communicates with the first mounting cavity 11, so that the oil liquid acts on the control switch 2 after passing through the filter part. The control switch 2 comprises a valve core 21 and an elastic part 22 abutting against the valve core 21. The adjusting part 3 abuts against the elastic part 22 and is rotatable to drive the elastic part 22 to stretch and contract, so as to adjust the pre-tightening force of the control switch 2.

[0036] The application sets the control device with a filter 4, so that the oil can enter the valve core 21 after being filtered by the filter 4, so that impurities can be blocked outside the valve core by the filter 4. Avoid the case that the impurities in the oil cause wear and damage to the valve core 21 due to the small gap between the valve core 21 and the shell 1, and avoid the case that the control device cannot work due to jam, thereby causing the hydraulic motor to be unable to work normally, thereby ensuring the cleanliness of the oil entering the valve core 21, on the one hand, prolonging the maintenance period of the hydraulic motor, reducing the maintenance cost, and prolonging the service life of the control device, on the other hand, ensuring the normal work of the hydraulic motor. At the same time, the adjusting part 3 and the elastic part 22 are in abutment, and are set to be rotatable to drive the spring 221 to stretch and contract, thereby adjusting the size of the pre-tightening force of the elastic assembly, so that the valve core 21 realizes the effect of adjusting the control starting point according to different pre-tightening forces. On the one hand, the pre-tightening force of the elastic part 22 is adjusted by rotating, which avoids the case that the angle between the elastic part 22 and the adjusting part 3 causes the force position and displacement position of the spring 221 to be unable to be guaranteed, thereby guaranteeing the displacement of the elastic part 22, without the need for limiting the elastic part 22 and the valve core 21 through the second mounting cavity 12, so that the valve core 21 and the side wall of the first mounting cavity 11 can have a certain gap, thereby further avoiding the case that the impurities in the oil cause wear and damage to the valve core 21 and the side wall of the first mounting cavity 11, thereby further prolonging the service life of the control device. On the other hand, compared with the telescopic screw in the prior art, the adjusting part 3 of the application only needs to be fixed at a suitable position to rotate to adjust the pre-tightening force of the elastic part 22, without the need for the adjusting part 3 to change the position such as telescopic, thereby avoiding the case that the part of the adjusting part 3 extending into the second mounting cavity 12 is too much, and the part of the adjusting part 3 outside the second mounting cavity 12 is too little, thereby causing the process of pulling the adjusting part 3 outwards to be inconvenient, thereby simplifying the process of controlling the valve core 21, and simplifying the structure of the control device.

[0037] It should be noted that the application does not make specific limitations on the way the filter 4 filters the oil, and as a preferred embodiment of the application, as shown in Figure 2 The outer wall of the filter 4 and the inner wall of the third mounting cavity 13 form an oil passage for the oil to pass through, the filter 4 is provided with a flow limiting protrusion 41 abutting the inner wall of the third mounting cavity 13, the inside of the filter 4 is provided with a flow hole 42, and the oil passage and the flow hole 42 are connected by a flow passage, and the diameter of the flow passage is smaller than the diameters of the oil passage and the flow hole 42.

[0038] By setting the filter piece 4 with the flow limiting protrusion 41 abutting against the inner wall of the third mounting cavity 13, setting the flow hole 42 in the interior of the filter piece 4, and communicating the flow passage between the oil passage and the flow hole 42, when hydraulic pressure enters the oil passage, due to the abutment of the flow limiting protrusion 41 and the inner wall of the third mounting cavity 13, the passage of oil is prevented, and the oil enters the flow passage. Due to the fact that the diameter of the flow passage is smaller than the diameters of the oil passage and the flow hole 42, the impurities in the oil entering the flow passage cannot pass through the diameter of the flow passage to enter the flow hole 42 and enter the valve core 21, thereby avoiding the situation that the impurities entering the valve core 21 cause jamming and result in the failure of the hydraulic motor to work. At the same time, the diameters of the flow hole 42 and the flow groove are set to be greater than the diameter of the flow passage, which ensures smooth passage of the oil and avoids the situation that too small a pore size of the flow passage results in too little oil passing through, thereby ensuring the reliability of the operation of the control device.

[0039] It should be noted that the number of the flow limiting protrusions 41 is not specifically limited in the present application. As a preferred embodiment of the present application, as shown in Figure 2 the plurality of flow limiting protrusions 41 are arranged along the axial direction of the filter piece 4, and a filter protrusion 43 is arranged between each of the flow limiting protrusions 41. The filter protrusion 43 has a gap allowing oil to pass between the inner wall of the mounting cavity.

[0040] By arranging a plurality of flow limiting protrusions 41 and a filter protrusion 43 between each of the flow limiting protrusions 41, the filter protrusion 43 can further filter the oil, thereby avoiding the possibility of the oil entering the valve core 21 through the flow passage, so that the filter protrusion 43 can further filter the oil, thereby ensuring the filtering effect of the filter piece 4 and further avoiding the situation that impurities in the oil enter the valve core 21, causing the control switch 2 to jam and resulting in the failure of the hydraulic motor to work normally, thereby ensuring the reliability of the operation of the hydraulic motor.

[0041] Further, as shown in Figure 2 a group of filter protrusions 43 is arranged between each two flow limiting protrusions 41. Each group of flow limiting protrusions 41 includes a plurality of flow limiting protrusions 41, and the gap between each flow limiting protrusion 41 in each group and the mounting cavity is different.

[0042] By setting the filter protrusions 43 with multiple, further avoid the possibility of impurities in the oil through the filter 4 into the spool 21, to ensure that the filter 4 can effectively filter impurities in the oil, further improve the effect of the filter 4 filter, so that the filter 4 can more effectively protect the spool 21 from damage to the oil impurities, and further ensure the reliability of the hydraulic motor work.

[0043] Of course, each group of the flow limiting protrusions 41 can also be one flow limiting protrusion 41, which is not specifically limited here.

[0044] As a preferred embodiment of the present application, as shown in Figure 2 The flow hole 42 is provided with multiple along the axial direction of the filter 4, and multiple flow holes 42 are communicated through the flow channel.

[0045] By setting the flow hole 42 with multiple, the path of the flow channel is increased, the probability of impurities through the filter 4 into the spool 21 is reduced, so that the filtering effect of the filter 4 is better, the filtering effect of the filter 4 is further improved, the possibility of impurities through the filter 4 into the spool 21 is more effectively avoided, the spool 21 is further protected from impurities wear, and the normal work of the hydraulic motor is ensured.

[0046] As a preferred embodiment of the present application, as shown in Figure 3 The adjusting member 3 includes a support rod 31 and a control portion 32 abutting against the control switch 2, the control portion 32 is arranged at an eccentric position of the support rod 31, one end of the support rod 31 is connected with the control portion 32 and extends into the second mounting cavity 12, and the other end protrudes outside the shell 1 to adjust the position of the control portion 32.

[0047] By setting the adjusting member 3 to include a support rod 31 and a control part 32 abutting against the control switch 2, and setting the control part 32 at an eccentric position, so that the control part 32 has a position axially deviated upward and a position axially deviated downward relative to the support rod 31 in the longitudinal direction, when it is needed to adjust the pre-tightening force of the spring 221, the support rod 31 is rotated to change the position of the control part 32, when it is needed that the pre-tightening force of the elastic member 22 is larger, the control part 32 is rotated to the position deviated upward, so that the elastic member 22 is kept in the compressed state, when it is needed that the pre-tightening force of the elastic member 22 is smaller, the control part 32 is rotated to the position deviated downward, so that the elastic member 22 is in the relaxed state, in this way, the pre-tightening force of the spring 221 is adjusted, compared with the prior art, the position of the elastic member 22 is not needed to be adjusted, the situation that the support rod 31 is not convenient to be pulled out or even cannot be pulled out due to that the part of the support rod 31 outside the second mounting cavity 12 is too small is avoided, the step of adjusting the pre-tightening force of the elastic member 22 by the adjusting member 3 is simplified, and the reliability of the working of the adjusting member 3 is ensured.

[0048] Further, as shown in Figure 1 the elastic member 22 includes a spring 221 sleeved on the valve core 21 and a spring seat 222 arranged around the outer wall of the spring 221, the spring seat 222 is provided with a limiting hole with the same diameter as the control part 32, and the control part 32 is inserted into the limiting hole to adjust the pre-tightening force of the spring 221.

[0049] By configuring the spring 221 assembly to include a spring 221 and a spring seat 222 sleeved around the outer wall of the spring 221, and the control member being inserted into the limiting hole of the spring seat 222, when the support rod 31 is rotated, the position of the control member changes accordingly. When the position of the control member is biased downward, the position of the spring seat 222 is also located downward. Therefore, the spring 221 is in its original state. At this time, the preload force of the spring 221 is small, the opening of the control device becomes larger, and the flow rate becomes larger; when the position of the control member is biased upward, the spring seat 222 is driven by the control member to move upward, the spring 221 is compressed, and the preload force of the spring 221 becomes larger. Therefore, the opening of the control device becomes smaller, and the flow rate becomes smaller. The preload force of the spring 221 is adjusted by rotating the support rod 31. Compared with the method in the prior art of controlling the compression and extension of the spring 221 by inserting and pulling out the support rod 31, the support rod 31 of the present application will not change position with the rotation, ensuring that the support rod 31 is always in a fixed position, avoiding the situation where the support rod 31 is completely immersed in the shell 1, which is inconvenient to pull out or even impossible to stretch, resulting in the inability to adjust the preload force of the spring 221, further ensuring the reliability of the operation of the adjustment member 3.

[0050] It should be noted that the present application does not limit the manner in which the control member adjusts the preload force of the spring 221 . Preferably, the bottom wall of the spring seat 222 is recessed inward to form an abutment portion, and the inner diameter of the abutment portion is smaller than the outer diameter of the spring 221 .

[0051] By setting the inner diameter of the abutment portion to be smaller than the outer diameter of the spring 221, when the support rod 31 drives the position of the spring seat 222 upward, the abutment portion can drive the spring 221 to move upward to compress it, and by recessing the bottom wall of the spring seat 222 inward to form an abutment portion, when the abutment portion applies upward pressure to the spring 221, the force applied to the spring 221 can be more uniform, thereby making the compression force of the spring 221 more uniform, avoiding the situation where the spring 221 cannot control the starting point due to uneven force applied to the valve core 21, thereby ensuring the reliability of the operation of the regulating member 3.

[0052] As a preferred embodiment of this embodiment, Figure 1 As shown, the control device further includes a limiting member 33 , and a gasket 34 is provided at the position where the support rod 31 abuts the housing 1 . The limiting member 33 abuts the gasket 34 to fix the support rod 31 on the second mounting cavity 12 .

[0053] The support rod 31 is fixed on the second mounting cavity 12 by arranging the limiting piece 33 and the gasket 34, the gasket 34 increases the acting area of the limiting piece 33, reduces the pressure generated by the limiting piece 33 on the shell 1, avoids the damage of the shell 1 caused by the large force of the limiting piece 33 on the shell 1, and ensures that the support rod 31 cannot move into the second mounting cavity 12 along with the adjusting force of the elastic piece 22, thereby ensuring the reliability of the adjusting piece 3.

[0054] As a preferred embodiment of the application, the shell 1 is further provided with a throttle hole 14, the throttle hole 14 includes a first throttle hole 141 arranged on the upper part of the control switch 2 and a second throttle hole 142 arranged on the bottom of the shell 1, and the aperture of the first throttle hole 141 is larger than that of the second throttle hole 142.

[0055] By arranging the throttle hole 14 on the shell 1, and the aperture of the first throttle hole 141 is larger than that of the second throttle hole 142, the hydraulic oil enters the inside of the shell 1 through the first throttle hole 141 and acts on the valve core 21, the aperture of the first throttle hole 141 is set to be larger, so that enough oil acts on the valve core 21, thereby ensuring that the force acting on the valve core 21 is large enough to drive the valve core 21 to move downward, avoiding the case that the small aperture of the first throttle hole 141 causes the oil to be unable to drive the valve core 21, and the aperture of the second throttle hole 142 is smaller than that of the first throttle hole 141, so that the pressure inside the shell 1 can change with the change of the external pressure, avoiding the case that the pressure inside the shell 1 is different from the outside and cannot realize synchronous change of displacement, thereby ensuring the proportional control of the displacement of the hydraulic motor.

[0056] The control device of the application uses the hydraulic principle in the hydraulic motor as shown in the figure. Figure 4 The hydraulic oil in the AB main oil passage enters the filter 4 after pressure selection, enters the valve core 21 after filtration of the filter 4, and flows to the control plunger cavity 5 through the on-off control of the valve core 21, the hydraulic oil in the control plunger cavity 5 drives the control plunger to move, and the variable displacement process of the motor is realized.

[0057] The places not described in the application can be realized by using or referring to the existing technology.

[0058] Each embodiment in the specification is described in a progressive manner, and the same or similar parts between each embodiment can be referred to each other, and each embodiment mainly describes the difference from other embodiments.

[0059] The above merely provides an example of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application should be included in the scope of claims of the present application.

Claims

1. A control device of a hydraulic motor, characterized by, The control device comprises a shell, a control switch arranged in the shell, an adjusting part for adjusting the control switch, and a filter arranged above the control switch. The shell is internally formed with a first installation cavity for accommodating the control switch, a second installation cavity for accommodating the adjusting part, and a third installation cavity for accommodating the filter. The third installation cavity is arranged above the first installation cavity and communicates with the first installation cavity, so that oil passes through the filter and acts on the control switch. The control switch comprises a valve core and an elastic part abutting against the valve core. The adjusting part abuts against the elastic part and is rotatable to drive the elastic part to stretch and contract, so as to adjust the pre-tightening force of the control switch. The outer wall of the filter forms an oil passage with the inner wall of the third installation cavity. The filter is provided with a flow-limiting protrusion abutting against the inner wall of the third installation cavity. The filter is internally provided with a flow hole. The oil passage and the flow hole are connected by a flow passage. The diameter of the flow passage is smaller than the diameters of the oil passage and the flow hole.

2. A control device for a hydraulic motor according to claim 1, wherein The flow-limiting protrusions are arranged along the axial direction of the filter. Each of the flow-limiting protrusions is provided with a filter protrusion therebetween. The filter protrusion has a gap with the inner wall of the third installation cavity, through which oil passes.

3. A control device for a hydraulic motor according to claim 2, wherein Each group of the filter protrusions is arranged between every two flow-limiting protrusions. Each group of the flow-limiting protrusions comprises a plurality of flow-limiting protrusions. Each flow-limiting protrusion in each group has a different gap with the third installation cavity.

4. The control device for a hydraulic motor according to claim 1, wherein A plurality of flow holes are arranged along the axial direction of the filter. The plurality of flow holes are communicated by the flow passage.

5. The control device for a hydraulic motor according to claim 1, wherein The adjusting part comprises a support rod and a control part abutting against the control switch. The control part is arranged at an eccentric position of the support rod. One end of the support rod is connected to the control part and extends into the second installation cavity. The other end of the support rod protrudes outside the shell, so as to adjust the position of the control part.

6. A control device for a hydraulic motor according to claim 5, wherein The elastic part comprises a spring sleeved on the valve core and a spring seat arranged around the outer wall of the spring. The spring seat is provided with a limiting hole with the same diameter as the control part. The control part is inserted into the limiting hole to adjust the pre-tightening force of the spring.

7. A control device for a hydraulic motor according to claim 6, wherein The bottom wall of the spring seat is inwardly recessed to form an abutting part. The inner diameter of the abutting part is smaller than the outer diameter of the spring.

8. The control device for a hydraulic motor according to claim 5, wherein The control device further comprises a limiting part. The support rod is provided with a gasket at a position abutting against the shell. The limiting part abuts against the gasket to fix the support rod on the second installation cavity.

9. The control device for a hydraulic motor according to claim 1, wherein The shell is further provided with a throttling hole. The throttling hole comprises a first throttling hole arranged above the control switch and a second throttling hole arranged at the bottom of the shell. The diameter of the first throttling hole is larger than the diameter of the second throttling hole.

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