Brake piston for rotary motor and rotary motor

Abstract

The utility model relates to the technical field of hydraulic motors, in particular to a brake piston for a rotary motor and the rotary motor. The brake piston is provided with a piston body, an oil cavity is formed in the center of the piston body, and a fit clearance is formed between the outer circle of the piston body and an inner hole of the shell. The brake piston is provided with a flushing oil channel, the flushing oil channel penetrates through the piston body and enables the oil cavity to be communicated with the fit clearance, the projection of the central axis of the flushing oil channel in the radial plane is parallel to the radial line penetrating through the center of the piston body, and the central axis of the flushing oil channel does not intersect with the central axis of the piston body. By means of the brake piston, the efficient brake performance is kept, meanwhile, the abrasion problem caused by scrap accumulation and unsmooth oil flowing is remarkably reduced, and the service life of equipment is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic motors, in particular to a brake piston for a rotary motor and a rotary motor. Background Art

[0002] As a key component in mechanical systems, hydraulic motors are widely used in engineering, construction, transportation and other fields. The performance of their braking systems directly affects the safety and reliability of mechanical equipment.

[0003] During the starting and braking processes of a hydraulic motor, the brake piston and housing undergo relative motion. An O-ring is used between the brake piston and housing to prevent direct contact and reduce wear. This structure creates a small clearance between the brake piston and housing, which can easily accumulate debris and impurities. However, due to the small clearance, the infiltrated oil flows slowly, making it difficult for impurities to be expelled, thus increasing wear on the mating surfaces. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of the embodiment of the present utility model is to provide a brake piston for a rotary motor, which can significantly reduce the wear problems caused by debris accumulation and poor oil flow while maintaining efficient braking performance, thereby extending the service life of the equipment.

[0005] In order to achieve the above objectives, the present invention provides the following technical solutions:

[0006] A brake piston for a rotary motor, the rotary motor having a housing, the brake piston being installed in the housing, the brake piston having a piston body, the center of the piston body having an oil chamber, and a fitting clearance between the outer circle of the piston body and the inner hole of the housing; the brake piston is provided with a flushing oil channel, the flushing oil channel passes through the piston body and connects the oil chamber and the fitting clearance, the projection of the central axis of the flushing oil channel in a radial plane is parallel to a radial line passing through the center of the piston body, and the central axis of the flushing oil channel does not intersect with the central axis of the piston body.

[0007] Optionally, in the axial plane of the piston body, the projection of the central axis of the flushing oil channel forms a predetermined angle with the central axis of the piston body.

[0008] Optionally, the flushing oil passages are arranged in pairs, each pair of flushing oil passages includes two oil passages, and the two oil passages are arranged in a centrally symmetrical manner relative to the center of the piston body.

[0009] Optionally, the flushing oil channels include at least two pairs, wherein at least one pair of flushing oil channels is in a clockwise direction from the oil inlet to the oil outlet, and at least one pair of flushing oil channels is in a counterclockwise direction from the oil inlet to the oil outlet, wherein the oil inlet is located on one side of the oil chamber and the oil outlet is located on one side of the fitting clearance.

[0010] Optionally, the flushing oil channels include two pairs, one pair of flushing oil channels includes a first oil channel and a third oil channel, and the first oil channel and the third oil channel are oriented counterclockwise from the oil inlet to the oil outlet, and the other pair of flushing oil channels includes a second oil channel and a fourth oil channel, and the second oil channel and the fourth oil channel are oriented clockwise from the oil inlet to the oil outlet.

[0011] Optionally, the oil outlet of the first oil channel and the oil outlet of the third oil channel are located on the same radial line of the brake piston, and the oil inlet of the first oil channel and the oil inlet of the third oil channel are symmetrical relative to the center of the brake piston; the oil outlet of the second oil channel and the oil outlet of the fourth oil channel are located on the same radial line of the brake piston, and the oil inlet of the second oil channel and the oil inlet of the fourth oil channel are symmetrical relative to the center of the brake piston.

[0012] Optionally, the radial line where the oil outlet of the first oil channel and the oil outlet of the third oil channel are located is perpendicular to the radial line where the oil outlet of the second oil channel and the oil outlet of the fourth oil channel are located.

[0013] An embodiment of the present invention further provides a rotary motor, comprising a housing and the brake piston for the rotary motor as described above, wherein the brake piston is installed in the housing, and an O-ring is installed between the brake piston and the housing.

[0014] Optionally, the fitting gap is located axially outside the O-ring.

[0015] Optionally, the rotary motor further includes a cylinder body and a transmission shaft, wherein the cylinder body is installed in the brake piston, and the transmission shaft is inserted into the cylinder body.

[0016] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0017] Flushing oil channels are provided on the brake piston, extending through the piston body and connecting the oil chamber to the clearance. When the motor is running, the cylinder rotates, driving oil from the oil chamber inside the brake piston. The flushing oil channels guide the oil into the clearance between the brake piston and the housing. After flushing the clearance, the oil flows out from the edge of the brake piston, removing impurities from the gap. The arrangement of the flushing oil channels facilitates smooth oil flow within the channels, improving the efficiency of oil flow within the clearance, effectively removing impurities, reducing debris accumulation between the brake piston and the housing, and minimizing the risk of wear between the brake piston and the housing, thereby extending the service life of the equipment.

[0018] Additional advantages of the present invention will be given in the following description, and some will become apparent from the following description or be understood through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0020] Figure 1 This is a schematic diagram of the installation of the brake piston provided by an embodiment of the present utility model;

[0021] Figure 2 This is a top view of the brake piston provided by an embodiment of the present utility model;

[0022] Figure 3 This is a cross-sectional view of the flushing oil passage of the brake piston provided by an embodiment of the present utility model;

[0023] In the figure: 1, housing; 11, fitting clearance; 2, O-ring; 3, brake piston; 31, oil chamber; 32, flushing oil passage; 321, first oil passage; 322, second oil passage; 323, third oil passage; 324, fourth oil passage; 4, cylinder block; 5, drive shaft;

[0024] In order to show the positions of various parts, the distances or sizes between them are exaggerated. The schematic diagram is for reference only. DETAILED DESCRIPTION

[0025] It should be noted that the following detailed description is illustrative and is intended to further illustrate the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0026] A hydraulic swing motor is a device that uses hydraulic energy to drive mechanical equipment for rotational motion. It is primarily used in a variety of construction machinery and equipment, such as excavators, cranes, and tower cranes, in fields such as engineering machinery, metallurgical equipment, ships, and petroleum equipment. A hydraulic swing motor uses a pressure differential in the hydraulic oil to drive the rotor. Hydraulic oil enters the motor from the high-pressure end, driving the rotor, and is then discharged from the low-pressure end. Hydraulic swing motors offer high starting torque, fast response, and high control accuracy. They operate stably under various operating conditions and adapt to varying load and speed requirements.

[0027] like Figure 1Figure 2 shows a schematic diagram of the rotary motor structure. The outermost portion is the cover, inside which a rotating piston is mounted. An O-ring 2 is located between the brake piston 3 and the housing 1. Inside the rotating piston is the cylinder 4, and on the upper side of the cylinder 4 is a drive shaft 5. The brake piston 3 is a key component in the hydraulic motor braking system and fits tightly with the housing 1. The housing 1 secures the brake piston 3 and forms an oil passage. A sealing ring is provided between the housing 1 and the brake piston 3 to prevent oil leakage. The O-ring 2 is installed between the brake piston 3 and the housing 1 to prevent oil leakage through the gap and reduce direct friction between the two. By controlling the flow of oil, the brake piston 3 presses against the friction pads, achieving a braking effect and realizing the braking function.

[0028] As introduced in the background technology, the fit clearance 11 between the brake piston 3 and the housing 1 is small, the infiltrated oil flows slowly, and impurities are not easy to be discharged. There is relative movement between the brake piston 3 and the housing 1 during starting and braking, and the presence of impurities aggravates the wear of the fitting surface.

[0029] Therefore, the problems existing in the prior art mainly include:

[0030] 1. The gap between the brake piston 3 and the housing 1 is small, which makes it easy for debris to accumulate and difficult to discharge.

[0031] 2. The flow of oil is obstructed and impurities cannot be effectively removed, resulting in increased wear on the mating surfaces.

[0032] 3. Wear of the brake piston 3 and the housing 1 may affect the performance and life of the hydraulic motor.

[0033] In order to solve the above technical problems, staggered oil channels are designed on the brake piston 3 to guide the oil into the gap between the brake piston 3 and the housing 1, effectively removing impurities, reducing wear, and improving the reliability and durability of the hydraulic motor brake system.

[0034] like Figure 2 、 Figure 3 As shown, the brake piston 3 has a piston body, the center of the piston body has an oil chamber 31, and a matching gap 11 is formed between the outer circle of the piston body and the inner hole of the housing 1 (as shown in FIG. Figure 1 The brake piston 3 is provided with a flushing oil passage 32, which passes through the piston body and connects the oil chamber 31 with the fitting gap 11. The projection of the central axis of the flushing oil passage 32 in a radial plane is parallel to a radial line passing through the center of the piston body, and the central axis of the flushing oil passage 32 does not intersect with the central axis of the piston body.

[0035] Flushing oil passages 32 are provided on the brake piston 3, extending through the piston body and connecting the oil chamber 31 with the mating clearance 11. When the motor is running, the cylinder body 4 rotates, driving oil into the oil chamber 31 within the brake piston 3. The flushing oil passages 32 guide the oil into the mating clearance 11 between the brake piston 3 and the housing 1. After flushing the mating clearance 11, the oil flows out from the edge of the brake piston 3, carrying away impurities in the gap. The arrangement of the flushing oil passages 32 facilitates smooth oil flow within the passages, improves the flow efficiency of the oil within the mating clearance 11, effectively removes impurities, reduces the accumulation of debris between the brake piston 3 and the housing 1, reduces the risk of wear between the brake piston 3 and the housing 1, and extends the service life of the equipment.

[0036] In the axial plane of the piston body, the projection of the central axis of the flushing oil channel 32 forms a predetermined angle with the central axis of the piston body. The axial plane refers to a plane perpendicular to the radial plane and passing through the central axis. Figure 3 As shown, the oil enters the oil chamber 31 from the bottom and flows from the inside to the outside along the flushing oil groove. This design allows the flushing oil channel 32 to follow the flow direction of the oil in the axial direction, reducing flow resistance and improving the efficiency of the oil flow, thereby more effectively cleaning the fitting gap 11.

[0037] The flushing oil passages 32 are arranged in pairs, each pair of flushing oil passages 32 includes two oil passages, and the two oil passages are arranged symmetrically relative to the center of the piston body. This symmetrical arrangement helps to make the force applied to the brake piston 3 more uniform when working, reducing wear caused by uneven force.

[0038] The flushing oil passages 32 include at least two pairs, with at least one pair of flushing oil passages 32 running clockwise from the oil inlet to the oil outlet, and at least one pair of flushing oil passages 32 running counterclockwise from the oil inlet to the oil outlet. The oil inlet is located on one side of the oil chamber 31, and the oil outlet is located on one side of the mating gap 11. By staggering the flushing oil passages 32 to correspond to the different rotation directions of the motor, and to conform to the oil flow direction during forward and reverse rotation, respectively, the oil can effectively clean the mating gap 11 regardless of the motor's rotation.

[0039] In this embodiment, the flushing oil passages 32 include two pairs, one pair of flushing oil passages 32 includes a first oil passage 321 and a third oil passage 323, and the direction of the first oil passage 321 and the third oil passage 323 from the oil inlet to the oil outlet is counterclockwise, and the other pair of flushing oil passages 32 includes a second oil passage 322 and a fourth oil passage 324, and the direction of the second oil passage 322 and the fourth oil passage 324 from the oil inlet to the oil outlet is clockwise.

[0040] The oil outlets of the first and third oil channels 321 and 323 are located on the same radial line of the brake piston 3, and the oil inlets of the first and third oil channels 321 and 323 are symmetrical relative to the center of the brake piston 3. The oil outlets of the second and fourth oil channels 322 and 324 are located on the same radial line of the brake piston 3, and the oil inlets of the second and fourth oil channels 322 and 324 are symmetrical relative to the center of the brake piston 3. Specifically, the radial lines along which the oil outlets of the first and third oil channels 321 and 323 lie are perpendicular to the radial lines along which the oil outlets of the second and fourth oil channels 322 and 324 lie. These lines are evenly distributed across the four quadrants. This design ensures uniform distribution of the oil channels across the four quadrants, further improving the cleaning effect of the oil and ensuring the cleanliness of the fit gap 11.

[0041] Based on the aforementioned brake piston 3, an embodiment of the present invention further provides a rotary motor comprising a housing 1 and the aforementioned brake piston 3. The brake piston 3 is mounted within the housing 1, with an O-ring 2 interposed between the brake piston 3 and the housing 1. The fitting clearance 11 is located axially outward of the O-ring 2. The rotary motor further comprises a cylinder 4 and a drive shaft 5. The cylinder 4 is mounted within the brake piston 3, and the drive shaft 5 is inserted into the cylinder 4.

[0042] Working principle:

[0043] Starting phase: When the hydraulic system starts to supply oil, the oil enters through the oil inlet of the hydraulic motor, driving the motor to rotate, thereby driving the mechanical equipment to operate.

[0044] Braking stage: When braking is required, the brake piston 3 is pushed, pressing the friction plate to prevent the motor from continuing to rotate, thereby achieving braking.

[0045] Flushing the oil passage 32 aids in this process: The oil passage on the brake piston 3 plays a key role in motor operation. When the cylinder 4 rotates, oil flows from the inside of the brake piston 3 into the oil passage and is then directed into the clearance 11 between the brake piston 3 and the housing 1.

[0046] Flushing and discharge of impurities: The design of the flushing oil passage 32 enables the oil to form an effective flow in the gap between the brake piston 3 and the housing 1, flushing and carrying away possible accumulated debris and impurities, preventing these impurities from aggravating wear.

[0047] Oil return: The flushed oil carries impurities and flows out from the edge of the brake piston 3 and returns to the hydraulic system, completing a cleaning cycle.

[0048] Advantages of staggered oil channels: The staggered distribution design of the oil channels ensures that the oil can flow smoothly to and clean the mating surface between the brake piston 3 and the housing 1 regardless of whether the motor is rotating forward or reverse, thereby improving the cleaning efficiency and system reliability.

[0049] Although the above describes the specific implementation methods of the present invention in conjunction with the accompanying drawings, it does not limit the scope of protection of the present invention. Technical personnel in the relevant field should understand that on the basis of the technical solution of the present invention, various modifications or variations that can be made by technical personnel in this field without creative work are still within the scope of protection of the present invention.

Claims

1. A braking piston for a slewing motor, the slewing motor having a housing, the braking piston being installed in the housing, characterized in that, The braking piston has a piston body, an oil chamber is provided at the center of the piston body, and there is a mating clearance between the outer circumference of the piston body and the inner hole of the housing; The braking piston is provided with a flushing oil passage, the flushing oil passage penetrates through the piston body and communicates the oil chamber and the mating clearance, the projection of the central axis of the flushing oil passage in the radial plane is parallel to the radial line passing through the center of the piston body, and the central axis of the flushing oil passage does not intersect with the central axis of the piston body.

2. The braking piston for a rotary motor according to claim 1, characterized in that, In the axial plane of the piston body, the projection of the central axis of the flushing oil passage forms a predetermined angle with the central axis of the piston body.

3. The braking piston for a slewing motor according to claim 1, characterized in that, The flushing oil passages are arranged in pairs, and each pair of flushing oil passages includes two oil passages, and the two oil passages are arranged symmetrically about the center of the piston body.

4. The braking piston for a slewing motor according to claim 3, wherein, The flushing oil passages include at least two pairs, wherein at least one pair of flushing oil passages is in the clockwise direction from the oil inlet to the oil outlet, and at least one pair of flushing oil passages is in the counterclockwise direction from the oil inlet to the oil outlet, wherein the oil inlet is located on one side of the oil chamber and the oil outlet is located on one side of the mating clearance.

5. The braking piston for a rotary motor according to claim 3, characterized in that, The flushing oil passages include two pairs, wherein one pair of flushing oil passages includes a first oil passage and a third oil passage, and the first oil passage and the third oil passage are in the counterclockwise direction from the oil inlet to the oil outlet, and the other pair of flushing oil passages includes a second oil passage and a fourth oil passage, and the second oil passage and the fourth oil passage are in the clockwise direction from the oil inlet to the oil outlet.

6. The braking piston for a slewing motor according to claim 5, characterized in that, The oil outlets of the first oil passage and the third oil passage are located on the same radial line of the braking piston, and the oil inlets of the first oil passage and the third oil passage are symmetrically arranged about the center of the braking piston; the oil outlets of the second oil passage and the fourth oil passage are located on the same radial line of the braking piston, and the oil inlets of the second oil passage and the fourth oil passage are symmetrically arranged about the center of the braking piston.

7. The braking piston for a slewing motor according to claim 6, characterized in that, The radial line where the oil outlets of the first oil passage and the third oil passage are located is perpendicular to the radial line where the oil outlets of the second oil passage and the fourth oil passage are located.

8. A swing motor, characterized in that, It includes a housing and the braking piston for a rotary motor as described in claim 1, the braking piston is installed in the housing, and an O-ring is installed between the braking piston and the housing.

9. The swing motor according to claim 8, wherein, The mating clearance is located axially outside the O-ring.

10. The swing motor according to claim 8, characterized in that, The rotary motor further includes a cylinder block and a transmission shaft, the cylinder block is installed in the braking piston, and the transmission shaft is inserted into the cylinder block.

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