Adjustable hydraulic motor brake control structure

Abstract

The utility model discloses an adjustable hydraulic motor brake control structure, which belongs to the technical field of hydraulic motors and comprises a hydraulic motor and a brake piston, the brake piston is connected with a plurality of groups of friction plates, and a brake oil cavity is arranged between the hydraulic motor and the brake piston. A valve element threaded hole is formed in the hydraulic motor shell, and an adjusting valve element is connected into the valve element threaded hole in a threaded mode. The valve element threaded hole intersects with the inclined oil channel, and a lower oil channel of the inclined oil channel is connected with the brake oil cavity. A closed groove larger than the valve element threaded hole in size is formed in the outer side of the valve element threaded hole. The part, located outside the valve element threaded hole, of the adjusting valve element is in threaded connection with a sealing nut, and the sealing nut is in threaded connection with the closed groove. During operation, the position of the adjusting valve element in the valve element threaded hole is changed, the opening degree of the adjusting valve element and the inclined oil way is changed, and therefore the operation speed of the brake piston is adjusted, and related parts do not need to be disassembled. And the functions of braking state locking and long-term braking releasing can be achieved by screwing down the adjusting valve element to the bottom.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulic motors, and particularly relates to an adjustable hydraulic motor braking control structure. Background Technique

[0002] The statements in this part only provide background technical information related to the utility model, and do not necessarily constitute prior art.

[0003] For a hydraulic motor integrated with friction plates and a brake piston, the opening and closing of the brake piston are controlled by hydraulic oil to achieve release of braking / braking. Its working principle is that there is a brake oil cavity between the brake piston and the hydraulic motor. When there is no hydraulic oil in the brake oil cavity, the brake piston presses the friction plates under the action of the upper spring pressure, and the friction plates hold the rotating parts inside the hydraulic motor, making the hydraulic motor unable to rotate; when there is hydraulic oil in the brake oil cavity, the hydraulic oil will lift the brake piston and release the friction plates, enabling the hydraulic motor to rotate.

[0004] The movement speed of the brake piston affects the speed of the hydraulic motor braking. If the speed is too fast, the motor will brake quickly, which will cause a sense of impact for the hydraulic motor controlling mechanical movement, causing discomfort to the operator or generating a large inertial force, affecting the safety and stability of the mechanical equipment. If the speed is too slow, the movement will stop slowly. Although there is no impact, it may cause safety accidents, especially for the travel motor of an excavator and the swing motor controlling the rotation of the upper carriage. The braking performance directly affects the comfort of the operator and the safety of the excavator.

[0005] Currently, the method of controlling the movement speed of the brake piston, such as Figure 4 shown, is to install a throttle orifice with a fixed size in the brake oil passage, that is, there is a hole with a fixed size on the small plug. When the oil flows through the small hole, the flow rate and pressure will decrease; if the speed needs to be adjusted, it is necessary to stop the vehicle, disassemble the motor or the plug, and replace the throttle orifice with different specifications for adjustment. The operation is complex, and hydraulic oil leakage will occur during disassembly and assembly.

[0006] Due to the leakage of hydraulic oil when the plug is opened, the brake piston will return to the braking state, and it is impossible to control the long-term opening of the brake piston, and the locking function of the brake opening cannot be realized. Content of the Utility Model

[0007] Aiming at the above problems, the utility model provides an adjustable hydraulic motor braking control structure, which can adjust the running speed of the brake piston during operation, without disassembling relevant components, is convenient to adjust, avoids hydraulic oil loss, has a simple structure and low cost; at the same time, it can realize the locking of the braking state and the long-term release of the braking function.

[0008] To achieve the above purpose, the utility model adopts the following technical solutions:

[0009] An adjustable hydraulic motor braking control structure includes a hydraulic motor and a braking piston. The braking piston is connected to multiple friction plates, and there is a braking oil chamber between the hydraulic motor and the braking piston; a valve core threaded hole is opened on the housing of the hydraulic motor, and a regulating valve core is threadedly connected in the valve core threaded hole;

[0010] On the housing, the valve core threaded hole intersects with an inclined oil passage. The inclined oil passage is divided into an upper oil passage and a lower oil passage, and the lower oil passage is connected to the braking oil chamber;

[0011] On the surface of the housing, a closed groove with a size larger than the valve core threaded hole is further provided outside the valve core threaded hole;

[0012] The part of the regulating valve core located outside the valve core threaded hole is threadedly connected to a sealing nut, and the sealing nut is threadedly connected to the closed groove.

[0013] Preferably, a second internal thread is provided in the closed groove.

[0014] Preferably, the valve core threaded hole is divided into two sections, namely a straight section and a first threaded section, and a first internal thread is provided in the first threaded section.

[0015] Preferably, the regulating valve core is divided into two sections, including a valve core threaded section and a valve core sealing section.

[0016] Preferably, the length of the valve core threaded section is greater than the length of the first threaded section, and the valve core sealing section is also greater than the length of the straight section.

[0017] Preferably, a first external thread is provided on the valve core threaded section, and the first external thread is used in matching with the first internal thread.

[0018] Preferably, one end of the valve core threaded section away from the valve core sealing section is the rear end of the valve core, and a standard internal hexagonal opening is provided on the rear end of the valve core.

[0019] Preferably, a first internal thread is provided inside the sealing nut, and a closed protrusion is provided at one end of the sealing nut.

[0020] Preferably, a second external thread is provided on the outside of the closed protrusion, and the second external thread is used in matching with the second internal thread.

[0021] Preferably, a sealing ring is further provided on the sealing nut.

[0022] Compared with the prior art, the advantages and positive effects of the present utility model are:

[0023] The utility model connects an inclined oil passage processed on the housing of a hydraulic motor to a brake oil cavity, then processes a valve core threaded hole and a closed groove outside the valve core threaded hole; then thread-connects a regulating valve core to the valve core threaded hole and fixes it with a sealing nut. During operation, by changing the position of the regulating valve core in the valve core threaded hole, the opening amount between the regulating valve core and the inclined oil passage can be changed, thereby regulating the operating speed of the brake piston, solving the problem that the current hydraulic motor integrating friction plates and brake pistons has inconsistent requirements for brake response speed under different application conditions and has large starting impact or braking impact. Without disassembling relevant components, it is convenient to adjust, avoiding hydraulic oil loss, with a simple structure and low cost, and the universal structure of the whole product can be realized. The utility model can also lock the brake state and release the braking function for a long time by tightening the regulating valve core to the end. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The attached drawings forming a part of this utility model are used to provide a further understanding of the utility model. The schematic embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an improper limitation to the utility model.

[0025] Figure 1 is a sectional view of the regulating valve core of the embodiment of the utility model when the inclined oil passage is not blocked;

[0026] Figure 2 is a sectional view of the regulating valve core of the embodiment of the utility model when the inclined oil passage is blocked;

[0027] Figure 3 is a sectional view of the regulating valve core of the embodiment of the utility model;

[0028] Figure 4 is a schematic structural diagram of the prior art for controlling the movement speed of the brake piston;

[0029] In the figure:

[0030] 1. Regulating valve core; 2. Sealing nut; 3. Housing; 4. Brake piston; 5. Rear end of valve core; 6. Upper oil passage; 7. Lower oil passage; 8. Brake oil cavity; 9. Threaded section of valve core; 10. Sealing section of valve core; 11. Friction plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanations for the utility model. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as commonly understood by those of ordinary skill in the technical field to which the utility model belongs.

[0032] The following combines the attached drawings to describe the utility model in detail. An adjustable hydraulic motor brake control structure disclosed in this embodiment is as shown in Figure 1As shown in the figure, it includes a hydraulic motor and a brake piston 4. The brake piston 4 is connected to multiple sets of friction plates 11, and there is a brake oil chamber 8 between the hydraulic motor and the brake piston 4.

[0033] When there is hydraulic oil in the brake oil chamber 8, the brake piston 4 is pushed up and the hydraulic motor can rotate. When the hydraulic oil in the brake oil chamber 8 decreases, the brake piston 4 presses the friction plates under the action of the spring, making the hydraulic motor unable to rotate.

[0034] As Figure 1 、 Figure 2 shown, a valve core threaded hole is provided on the housing 3 of the hydraulic motor, and a regulating valve core 1 is threadedly connected in the valve core threaded hole; the valve core threaded hole is divided into two sections, namely a straight section and a first threaded section, and a first internal thread is provided in the first threaded section; on the surface of the housing 3, outside the valve core threaded hole, a closed groove with a size larger than the valve core threaded hole is also provided, and a second internal thread is provided in the closed groove.

[0035] As Figure 1 shown, on the housing 3, the straight section of the valve core threaded hole intersects with the inclined oil passage. Taking the straight section as the boundary, the inclined oil passage is divided into an upper oil passage 6 and a lower oil passage 7, and the lower oil passage 7 is connected to the brake oil chamber 8; when the hydraulic oil flows through the straight section from the upper oil passage 6 into the lower oil passage 7, it will be pressed into the brake oil chamber 8, thereby pushing up the brake piston 4 and the hydraulic motor can rotate.

[0036] As Figure 1 、 Figure 3 shown, the regulating valve core 1 is divided into two sections, including a valve core threaded section 9 and a valve core sealing section 10. The length of the valve core threaded section 9 is greater than the length of the first threaded section, and the valve core sealing section 10 is also greater than the length of the straight section, ensuring that the valve core sealing section 10 can seal the straight section; a first external thread is provided on the valve core threaded section 9, and the first external thread is used in matching with the first internal thread. One end of the valve core threaded section 9 away from the valve core sealing section 10 is the valve core rear end 5, and a standard internal hexagon socket is provided on the valve core rear end 5, and the regulating valve core connected in the valve core threaded hole can be rotated and adjusted by an internal hexagon wrench.

[0037] As Figure 1 shown, when the regulating valve core 1 is threadedly connected in the valve core threaded hole, the valve core threaded section 9 outside the housing 3 is threadedly connected to the sealing nut 2; as Figure 1 shown, a first internal thread is provided inside the sealing nut 2, a closed protrusion is provided at one end of the sealing nut 2, and a second external thread is provided on the outside of the closed protrusion for threaded connection with the closed groove; a sealing ring is also provided on the sealing nut 2. It can be understood that when the regulating valve core 1 is threadedly connected in the valve core threaded hole and the sealing nut 2 is tightened towards the closed groove on the housing 3, the regulating valve core 1 can be fixed, and at the same time, the internal oil fluid can be sealed to prevent the hydraulic oil from flowing out. As Figure 1As shown, a step limit is also provided at the bottom of the straight section of the valve core threaded hole, which can limit the position of the valve core when the regulating valve core 1 is screwed to the end.

[0038] When the straight section of the valve core threaded hole is completely blocked by the valve core sealing section 10 of the regulating valve core 1, hydraulic oil cannot flow between the upper oil passage 6 and the lower oil passage 7; when the straight section of the valve core threaded hole is not blocked by the valve core sealing section 10 of the regulating valve core 1, hydraulic oil flows between the upper oil passage 6 and the lower oil passage 7. At this time, a certain opening amount is formed between the regulating valve core 1 and the upper oil passage 6 (such as Figure 1 the position shown), and the size of the opening amount determines the size of the area through which the hydraulic oil passes. The smaller the area, the smaller its flow rate, and the slower the movement speed of the brake piston 4 is affected. Similarly, the larger the opening formed between the regulating valve core 1 and the upper oil passage 6, the faster the movement speed of the brake piston 4, resulting in a large impact during opening.

[0039] By inserting an internal hexagon wrench into the standard internal hexagon opening at the rear end 5 of the valve core, the opening amount between the regulating valve core 1 and the upper oil passage 6 is rotationally adjusted, and the movement speed of the brake piston is adjusted by adjusting the opening amount. After the adjustment is completed, tighten the sealing nut 2, which can further fix the regulating valve core 1 on the housing 3, prevent the regulating valve core 1 from moving during the operation of the motor, avoid changes in the opening amount, ensure the stability of the structural throttling function, and the stability of the movement speed of the brake piston 4. At the same time, it can also seal the internal oil of the housing 3 to prevent hydraulic oil from flowing out.

[0040] Working principle:

[0041] As Figure 1 shown, when releasing the brake, working hydraulic oil enters from the inclined oil passage hole in the housing 3. A certain opening amount is formed between the regulating valve core 1 and the upper oil passage 6. After the hydraulic oil passes through the upper oil passage 6, it flows into the lower oil passage 7, and pressure is established in the brake oil cavity 8 formed between the brake piston 4 and the housing 3, thereby lifting the brake piston 4 and separating multiple sets of friction plates 11 from each other, no longer pressing tightly so that there is no frictional force, and the hydraulic motor can rotate.

[0042] As Figure 2 shown, when braking, the hydraulic oil flows out from the brake oil cavity 8, passes through the lower oil passage 7, and flows out of the upper oil passage 6 through the straight section. Under the action of the spring, the brake piston 4 moves downward to press multiple sets of friction plates 11, stopping the rotation of the hydraulic motor.

[0043] If it is necessary to keep the brake piston 4 in the open state, after the hydraulic oil enters the brake oil cavity 8 and lifts the brake piston 4, the regulating valve core 1 can be tightened to make the valve core sealing section 10 reach the bottom of the valve core threaded hole, blocking the connection between the upper oil passage 6 and the lower oil passage 7, preventing the hydraulic oil from flowing out of the brake oil cavity 8, so that the brake piston 4 remains in the continuously open state, realizing the long-term brake release function.

[0044] Similarly, in the braking state, the regulating valve core 1 is tightened so that the sealing section 10 of the valve core reaches the bottom of the valve core threaded hole, sealing the connection between the upper oil passage 6 and the lower oil passage 7, preventing the hydraulic oil from flowing from the upper oil passage 6 into the lower oil passage 7, keeping the hydraulic motor in a braking state, and achieving the locking of the braking state.

[0045] The utility model only needs to process an inclined oil passage on the housing 3 of the hydraulic motor to communicate with the braking oil cavity 8, and then process a valve core threaded hole and a closed groove outside the valve core threaded hole; in the regulating valve core, only the part of the sealing section 10 of the valve core requires a relatively high machining accuracy to fit the valve core threaded hole to seal the hydraulic oil; the overall structure is simple, the processing is convenient and the cost is low.

[0046] The utility model can adjust the running speed of the braking piston during operation, without disassembling relevant components, is convenient to adjust, avoids the loss of hydraulic oil, has a simple structure and low cost, and can realize the universality of the whole product structure. At the same time, it can realize the locking of the braking state and the long-term release of the braking function. It solves the problems that the hydraulic motors integrating friction plates and braking pistons have inconsistent requirements for braking response speed and large starting impact or braking impact under different application conditions.

[0047] Although the specific implementation manners of the present invention are described above in conjunction with the drawings, it is not a limitation to the protection scope of the present invention. Those skilled in the art should understand that, based on the technical solutions of the present invention, various modifications or deformations that can be made by those skilled in the art without creative labor are still within the protection scope of the present invention.

Claims

1. An adjustable hydraulic motor braking control structure, comprising a hydraulic motor and a braking piston, the braking piston is connected to multiple groups of friction plates, and there is a braking oil cavity between the hydraulic motor and the braking piston; characterized in that, The housing of the hydraulic motor is provided with a valve core threaded hole, and a regulating valve core is connected to the valve core threaded hole by internal threads. On the housing, the valve core threaded hole intersects with an inclined oil passage, and the inclined oil passage is divided into an upper oil passage and a lower oil passage, and the lower oil passage is connected to the brake oil cavity. On the surface of the housing, a closed groove with a size larger than the valve core threaded hole is further provided outside the valve core threaded hole. The part of the regulating valve core located outside the valve core threaded hole is threadedly connected to a sealing nut, and the sealing nut is threadedly connected to the closed groove.

2. The adjustable hydraulic motor braking control structure according to claim 1, characterized in that, A second internal thread is provided in the closed groove.

3. An adjustable hydraulic motor braking control structure according to claim 1, characterized in that, The valve core threaded hole is divided into two sections, namely a straight section and a first threaded section, and a first internal thread is provided in the first threaded section.

4. An adjustable hydraulic motor braking control structure according to claim 1, characterized in that, The regulating valve core is divided into two sections, including a valve core threaded section and a valve core sealing section.

5. The adjustable hydraulic motor braking control structure according to claim 4, characterized in that, The length of the valve core threaded section is greater than the length of the first threaded section, and the valve core sealing section is also greater than the length of the straight section.

6. The adjustable hydraulic motor braking control structure according to claim 4, characterized in that, A first external thread is provided on the valve core threaded section, and the first external thread is used in matching with the first internal thread.

7. The adjustable hydraulic motor braking control structure according to claim 4, characterized in that One end of the valve core threaded section away from the valve core sealing section is the rear end of the valve core, and a standard internal hexagonal opening is provided on the rear end of the valve core.

8. An adjustable hydraulic motor braking control structure according to claim 1, characterized in that, A first internal thread is provided inside the sealing nut, and a closed protrusion is provided at one end of the sealing nut.

9. An adjustable hydraulic motor braking control structure according to claim 8, characterized in that, A second external thread is provided on the outside of the closed protrusion, and the second external thread is used in matching with the second internal thread.

10. An adjustable hydraulic motor braking control structure according to claim 1, characterized in that, A sealing ring is further provided on the sealing nut.

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