A shaft-distributed hydraulic motor for high water-based media

Abstract

The present invention provides a shaft-distributed hydraulic motor for high-water-based media, which belongs to the technical field of hydraulic motors and includes an output shaft, a front housing, a rotary cylinder, a plunger roller assembly, a guide rail, a rear housing, and a distribution sleeve. The use of a distribution sleeve for flow distribution avoids the need for drilling holes on the output shaft in traditional shaft distribution, ensures the strength of the output shaft, and can achieve high torque output. At the same time, there is no need to use a distribution check valve, and it has the advantages of a small number of components, a compact structure, and high reliability. The three-bearing arrangement structure is adopted to reduce external leakage caused by the change in the gap between the rotary cylinder and the distribution sleeve, which causes external leakage to the outside, and internal leakage through the distribution gap, which is beneficial to improving volumetric efficiency and system reliability. The working medium and the bearing installation space in the motor are isolated and sealed by a rotating combined seal, so that the working medium and the bearing lubricating oil medium are separated, and the bearing rust caused by the lubricating oil medium mixing with the high-water-based working medium is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic motors, and particularly discloses an axial flow distribution hydraulic motor for high water-based media. Background Art

[0002] Hydraulic motors are widely used in engineering machinery, mining machinery, and other fields. Low-speed, high-torque hydraulic motors offer high torque output at low speeds, enabling them to directly drive loads. In fully mechanized coal mining operations, the hydraulic system's working medium has stringent requirements regarding flammability, explosiveness, and leakage pollution. High-water-based media with excellent flame resistance and low pollution levels, such as high-water-based emulsions, are required. Currently, most high-pressure, high-water-based hydraulic motors utilize an end-face flow distribution structure. However, operating in high-water-based media, it is difficult to form an effective lubricating film between the flow distribution pairs, resulting in high leakage and low volumetric efficiency. Furthermore, oil-lubricated bearings and other components are susceptible to rust, increasing the motor's failure and maintenance rate. Valve-based flow distribution structures, on the other hand, require two flow distribution check valves for each plunger. This not only increases the number of hydraulic motor components, increases the motor's size, and reduces its power-to-weight ratio, but also requires precise coordination between the two flow distribution valves, otherwise fluid entrapment and crossflow can occur, resulting in reduced reliability. Conventional shaft-based flow distribution structures require drilling holes in the output shaft, which compromises its strength and hinders high torque output. Summary of the Invention

[0003] The present invention provides an axial flow distribution hydraulic motor for high water-based media, which improves the problems of high water-based media hydraulic motors such as large leakage, low volumetric efficiency, and easy bearing corrosion caused by the end face flow distribution structure, large volume and low reliability caused by the valve flow distribution structure, and difficulty in achieving high torque output caused by the axial flow distribution structure that damages the output shaft strength.

[0004] The above-mentioned shaft-distributed hydraulic motor for high-water-based media includes an output shaft, a front housing, a rotary cylinder, a plunger roller assembly, a guide rail, a rear housing and a distribution sleeve; the front housing, the guide rail and the rear housing are connected in sequence by bolts; the inner curve action number of the guide rail is n; a medium inlet and a medium outlet are provided on the rear housing; the distribution sleeve is fixedly installed in the rear housing by a positioning stop and screws; the distribution sleeve is provided with a liquid inlet channel and a liquid outlet channel, the liquid inlet channel is connected to the medium inlet, and the liquid outlet channel is connected to the medium outlet, the liquid inlet channel includes a plurality of liquid inlet holes uniformly arranged along the circumference of the distribution sleeve and an annular groove connecting the plurality of liquid inlet holes, the liquid outlet channel includes a plurality of liquid outlet holes uniformly arranged along the circumference of the distribution sleeve and an annular groove connecting the plurality of liquid outlet holes, the number of liquid inlet holes and the number of liquid outlet holes are both n, the liquid inlet holes and the liquid outlet holes are staggered and the stagger angle is π / n ; The rotary cylinder is rotatably installed in the cavity formed by the front housing, guide rail, rear housing and distribution sleeve; the rotary cylinder is provided with a central axis hole, a plunger cavity, an axial flow channel and a radial groove, and the central axis hole is arranged along the central axis of the rotary cylinder. The number of plunger cavities, axial flow channels and radial grooves is equal and corresponds one to one. The plunger cavity and radial grooves are both opened on the outer wall of the rotary cylinder and are evenly arranged around the central axis hole. Each axial flow channel is connected to the corresponding plunger cavity and radial groove; a group of plunger roller assemblies is installed in each plunger cavity, and each group of plunger roller assemblies includes a plunger and a roller connected to each other, and the roller is located on the outside of the plunger and contacts the inner curve of the guide rail; the radial groove is located on the inner side of the liquid inlet and the liquid outlet, and is alternately connected with the liquid inlet and the liquid outlet as the rotary cylinder rotates; the output shaft passes through the front housing and the rotary cylinder, is rotatably connected to the front housing, and is circumferentially fixed to the rotary cylinder by a spline.

[0005] The above-mentioned axial distribution hydraulic motor for high water-based media also includes a front bearing, a middle bearing and a rear bearing; the output shaft is rotatably connected to the front housing through the front bearing and the middle bearing; the rotary cylinder is rotatably connected to the rear housing through the rear bearing.

[0006] In the above-mentioned axial distribution hydraulic motor for high water-based media, three groups of seals I are arranged between the rear housing and the distribution sleeve, and the three groups of seals I are arranged alternately with the liquid inlet channel and the liquid outlet channel; two groups of seals II are arranged between the rotating cylinder and the distribution sleeve, and the two groups of seals II are located on both sides of the liquid inlet channel and the liquid outlet channel.

[0007] In the above-mentioned axial distribution hydraulic motor for high water-based media, three sealing grooves I are opened on the outer wall of the distribution sleeve, and two sealing grooves II are opened on the inner wall; seal I is an O-ring installed in sealing groove I; seal II is a rotary combined seal installed in sealing groove II.

[0008] The above-mentioned axial flow distribution hydraulic motor for high water-based media also includes a brake assembly for braking the output shaft.

[0009] Compared with the prior art, the present invention has the following beneficial effects.

[0010] 1. The flow distribution sleeve is used to distribute the flow, which avoids the need to drill holes on the output shaft in traditional shaft distribution, ensuring the strength of the output shaft and achieving large torque output.

[0011] 2. No need to use a flow distribution check valve, with the advantages of small number of components, compact structure and high reliability.

[0012] 3. The three-bearing arrangement structure, especially the rear bearing added compared to the traditional structure, makes the rotary cylinder rotate smoothly, reduces the external leakage caused by the change of the gap between the rotary cylinder and the distribution sleeve caused by the tilt of the rotary cylinder, and the internal leakage through the distribution gap, thereby improving the volumetric efficiency and system reliability.

[0013] 4. Three O-rings are used to isolate and seal the medium inlet and outlet, as well as the internal and external spaces of the motor, further reducing leakage.

[0014] 5. The rotary combined seal is used to isolate and seal the working medium from the bearing installation space in the motor, thereby separating the working medium from the bearing lubricating oil medium and reducing the rust of the bearing caused by the bearing lubricating oil medium mixing into the working medium. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 The schematic diagram of the structure of the axial flow distribution hydraulic motor used for high water-based media;

[0017] Figure 2 for Figure 1 Cross-sectional view along the AA direction (including only the rotary cylinder, rear housing, and valve sleeve);

[0018] Figure 3 It is the structural diagram of the rotary cylinder;

[0019] Figure 4 Schematic diagram of the structure of the distribution sleeve;

[0020] Figure 5 This is a cross-sectional view of the distribution sleeve.

[0021] Numbers in the figure: 1-output shaft; 2-front bearing; 3-front housing; 4-middle bearing; 5-rotating cylinder; 5.1-plunger chamber; 5.2-axial flow channel; 5.3-radial groove; 6.1-plunger; 6.2-roller; 7-guide rail; 8-rear bearing; 9-rear housing; 9.1-medium inlet; 9.2-medium outlet; 10-distribution sleeve; 10.1-liquid inlet hole; 10.2-liquid outlet hole; 10.3-annular groove; 10.4-sealing groove I; 10.5-sealing groove II; 11-O-ring; 12-rotating combined seal; 13-brake housing; 14-brake shaft; 15-rear cover. DETAILED DESCRIPTION

[0022] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0023] This embodiment provides an axial flow distribution hydraulic motor for high water-based media, in which the working medium and the bearing lubricating oil medium are separated, and the motor has good sealing performance, compact structure, high working pressure and high reliability.

[0024] The above-mentioned shaft-distributed hydraulic motor for high-water-based media includes an output shaft 1, a front housing 3, a rotary cylinder 5, a plunger roller assembly, a guide rail 7, a rear housing 9 and a distribution sleeve 10; the front housing 3, the guide rail 7 and the rear housing 9 are connected in sequence by bolts; the inner curve action number of the guide rail 7 is n; the rear housing 9 is provided with a medium inlet 9.1 and a medium outlet 9.2; the distribution sleeve 10 is fixedly installed in the rear housing 9 by means of a positioning stop and screws; the distribution sleeve 10 is provided with a liquid inlet channel and a liquid outlet channel, the liquid inlet channel is connected to the medium inlet 9.1, and the liquid outlet channel is connected to the medium The liquid outlet 9.2 is connected, the liquid inlet channel includes a plurality of liquid inlet holes 10.1 uniformly arranged along the circumference of the distribution sleeve 10 and an annular groove 10.3 connecting the plurality of liquid inlet holes 10.1. The liquid outlet channel includes a plurality of liquid outlet holes 10.2 uniformly arranged along the circumference of the distribution sleeve 10 and an annular groove 10.3 connecting the plurality of liquid outlet holes 10.2. The number of the liquid inlet holes 10.1 and the number of the liquid outlet holes 10.2 are both n. The liquid inlet holes 10.1 and the liquid outlet holes 10.2 are staggered and the stagger angle is π / n. The arrangement of the annular groove 10.3 facilitates the working medium to pass through the distribution sleeve 10. The circumferential flow of the distribution sleeve 10; the rotary cylinder 5 is rotatably mounted in the cavity formed by the front housing 3, the guide rail 7, the rear housing 9, and the distribution sleeve 10; the rotary cylinder 5 is provided with a central axis hole, a plunger cavity 5.1, an axial flow channel 5.2 and a radial groove 5.3. The central axis hole is arranged along the central axis of the rotary cylinder 5. The number of the plunger cavity 5.1, the axial flow channel 5.2 and the radial groove 5.3 is equal and one-to-one corresponding. The plunger cavity 5.1 and the radial groove 5.3 are both opened on the outer wall of the rotary cylinder 5 and are evenly arranged around the central axis hole. Each axial flow channel 5.2 is connected to the corresponding Plunger cavity 5.1 and radial groove 5.3; each plunger cavity 5.1 is equipped with a plunger-roller assembly, each plunger-roller assembly comprising an interconnected plunger 6.1 and roller 6.2, with roller 6.2 located on the outside of plunger 6.1 and in contact with the inner curve of guide rail 7; radial groove 5.3 is located on the inside of liquid inlet hole 10.1 and liquid outlet hole 10.2, and is alternately connected to liquid inlet hole 10.1 and liquid outlet hole 10.2 as rotary cylinder 5 rotates; output shaft 1 passes through front housing 3 and rotary cylinder 5, is rotationally connected to front housing 3, and is circumferentially fixedly connected to rotary cylinder 5.

[0025] The working process of the above-mentioned axial flow distribution hydraulic motor for high water-based media is as follows:

[0026] The working medium enters through medium inlet 9.1, passes through liquid inlet hole 10.1, radial groove 5.3, and axial flow channel 5.2, and enters plunger cavity 5.1. This pushes plunger 6.1 and roller 6.2 in plunger cavity 5.1 outward along the inner curve of guide rail 7. Roller 6.2 transmits force to the inner curve of guide rail 7, generating a reaction force that in turn generates torque. Roller 6.2 transmits this reaction force to plunger 6.1, causing rotary cylinder 5 to rotate, driving output shaft 1. When rotary cylinder 5 rotates until radial groove 5.3 connects to liquid outlet hole 10.2, roller 6.2 moves inward along the inner curve of guide rail 7, pushing plunger 6.1 and squeezing the working medium in plunger cavity 5.1. The working medium is then discharged along axial flow channel 5.2, radial groove 5.3, liquid outlet hole 10.2, and finally, medium outlet 9.2. As the rotary cylinder 5 rotates, the radial grooves 5.3 alternately connect with the liquid inlet hole 10.1 and the liquid outlet hole 10.2. The reciprocating motion realizes the oil supply and discharge of the axial flow distribution hydraulic motor. The opening angles of the radial grooves 5.3 and the liquid inlet hole 10.1 and the liquid outlet hole 10.2 correspond to the suction and discharge curves of the inner curve of the guide rail 7.

[0027] The aforementioned axially distributed hydraulic motor for high-water-based media utilizes a distribution sleeve 10 for flow distribution, eliminating the need for drilling holes in the output shaft 1, ensuring the shaft's strength and enabling high torque output. Furthermore, the motor eliminates the need for a distribution check valve, resulting in a reduced number of parts, a compact structure, and high reliability. Radial grooves 5.3 are formed in the outer wall of the rotary cylinder 5 to avoid the impact of separate inlet and outlet holes on the cylinder's strength and enhance reliability. In this embodiment, the radial grooves 5.3 are rectangular.

[0028] The above-mentioned axial distribution hydraulic motor for high water-based media also includes a front bearing 2, a middle bearing 4 and a rear bearing 8; the output shaft 1 is rotatably connected to the front housing 3 through the front bearing 2 and the middle bearing 4, and is circumferentially fixedly connected to the rotary cylinder 5 through a spline; the rotary cylinder 5 is rotatably connected to the rear housing 9 through the rear bearing 8.

[0029] The adoption of a three-bearing arrangement structure, especially the rear bearing 8 added compared to the traditional two-bearing structure, can make the rotary cylinder 5 rotate smoothly, reduce the external leakage through the seal and the internal leakage through the distribution gap caused by the change in the gap between the rotary cylinder 5 and the distribution sleeve 10 caused by the tilt of the rotary cylinder 5, and improve the volumetric efficiency.

[0030] In the aforementioned axially distributed hydraulic motor for high-water-based media, three sets of seals I are installed between the rear housing 9 and the distribution sleeve 10, interlaced with the inlet and outlet channels. Two sets of seals II are installed between the rotary cylinder 5 and the distribution sleeve 10, located on either side of the inlet and outlet channels. Specifically, the distribution sleeve 10 has three sealing grooves I 10.4 defined on its outer wall and two sealing grooves II 10.5 defined on its inner wall. Seal I is an O-ring 11 installed in seal groove I 10.4; seal II is a rotary modular seal 12 installed in seal groove II 10.5.

[0031] Three O-rings 11 isolate and seal the media inlet 9.1 and outlet 9.2, as well as the motor's internal and external spaces, further reducing leakage. A rotating modular seal 12 isolates and seals the working medium from the motor's internal bearing mounting space, separating the working medium from the bearing lubricant and reducing bearing corrosion caused by the mixing of the bearing lubricant with the working medium.

[0032] The aforementioned axially distributed hydraulic motor for high-water-base media also includes a brake assembly for braking the output shaft 1 via the brake shaft 14 and the rotary cylinder 5. The brake assembly can employ existing structures and typically includes a brake housing 13, a brake shaft 14, alternating dynamic and static brake pads (not shown), a piston (not shown), a spring (not shown), and a rear cover 15. The front end of the brake housing 13 is connected to the rear housing 9, and the rear end is connected to the rear cover 15. The dynamic and static brake pads, piston, and spring are installed within the brake housing 13. The brake shaft 14 is splined to the rotary cylinder 5, and the brake pads are sleeved onto the brake shaft 14. In operation, oil is injected inward through the oil inlet, pushing the piston to overcome the spring force and apply pressure to the dynamic and static brake pads. This creates a gap between the dynamic and static brake pads, causing the dynamic brake pad to rotate with the brake shaft 14. In the braking state, the piston, under the spring force, does not apply pressure to the dynamic and static brake pads, causing friction between the two pads to achieve braking.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An axial flow distribution hydraulic motor for high water-based media, characterized in that: It includes an output shaft (1), a front housing (3), a rotary cylinder (5), a plunger roller assembly, a guide rail (7), a rear housing (9) and a distribution sleeve (10); The front housing (3), the guide rail (7), and the rear housing (9) are connected in sequence by bolts; The inner curve action number of the guide rail (7) is n; The rear housing (9) is provided with a medium inlet (9.1) and a medium outlet (9.2); The distribution sleeve (10) is fixedly installed in the rear housing (9) via positioning stoppers and screws; The distribution sleeve (10) is provided with a liquid inlet channel and a liquid outlet channel, the liquid inlet channel is communicated with the medium inlet (9.1), and the liquid outlet channel is communicated with the medium outlet (9.2), the liquid inlet channel comprises a plurality of liquid inlet holes (10.1) uniformly arranged along the circumference of the distribution sleeve (10) and an annular groove (10.3) connecting the plurality of liquid inlet holes (10.1), the liquid outlet channel comprises a plurality of liquid outlet holes (10.2) uniformly arranged along the circumference of the distribution sleeve (10) and an annular groove (10.3) connecting the plurality of liquid outlet holes (10.2), the number of the liquid inlet holes (10.1) and the number of the liquid outlet holes (10.2) are both n, the liquid inlet holes (10.1) and the liquid outlet holes (10.2) are staggered, and the stagger angle is π / n; The rotary cylinder (5) is rotatably mounted in a cavity formed by the front housing (3), the guide rail (7), the rear housing (9), and the flow distribution sleeve (10); The rotary cylinder (5) is provided with a central axis hole, a plunger cavity (5.1), an axial flow channel (5.2) and a radial groove (5.3); the central axis hole is arranged along the central axis of the rotary cylinder (5); the plunger cavity (5.1), the axial flow channel (5.2) and the radial groove (5.3) are equal in number and correspond one to one; the plunger cavity (5.1) and the radial groove (5.3) are both opened on the outer wall of the rotary cylinder (5) and are evenly arranged around the central axis hole; each axial flow channel (5.2) is connected to the corresponding plunger cavity (5.1) and radial groove (5.3); A group of plunger roller assemblies is installed in each plunger cavity (5.1), and each group of plunger roller assemblies includes a plunger (6.1) and a roller (6.2) connected to each other, and the roller (6.2) is located outside the plunger (6.1) and contacts the inner curve of the guide rail (7); The radial groove (5.3) is located inside the liquid inlet hole (10.1) and the liquid outlet hole (10.2), and is alternately connected with the liquid inlet hole (10.1) and the liquid outlet hole (10.2) as the rotary cylinder (5) rotates; The output shaft (1) passes through the front housing (3) and the rotary cylinder (5), is rotationally connected to the front housing (3), and is circumferentially fixedly connected to the rotary cylinder (5) via a spline.

2. The axial flow distribution hydraulic motor for high water-based media according to claim 1, characterized in that: Also includes a front bearing (2), a middle bearing (4) and a rear bearing (8); The output shaft (1) is rotatably connected to the front housing (3) via a front bearing (2) and a middle bearing (4); The rotary cylinder (5) is rotatably connected to the rear housing (9) via a rear bearing (8).

3. The axial flow distribution hydraulic motor for high water-based media according to claim 1, characterized in that: Three sets of sealing members I are provided between the rear housing (9) and the distribution sleeve (10), and the three sets of sealing members I are arranged alternately with the liquid inlet channel and the liquid outlet channel; Two sets of sealing members II are provided between the rotary cylinder (5) and the distribution sleeve (10), and the two sets of sealing members II are located on both sides of the liquid inlet channel and the liquid outlet channel.

4. The axial flow distribution hydraulic motor for high water-based media according to claim 3, characterized in that: Three sealing grooves I (10.4) are provided on the outer wall of the distribution sleeve (10), and two sealing grooves II (10.5) are provided on the inner wall; The sealing member I is an O-ring (11) installed in the sealing groove I (10.4); The seal II is a rotary combined seal (12) installed in the seal groove II (10.5).

5. The axial flow distribution hydraulic motor for high water-based media according to claim 1, characterized in that: Also included is a brake assembly for braking the output shaft (1).

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