Low-pulsation axial piston motor device without low-speed limitation

Abstract

The invention discloses a low-pulsation axial plunger motor device without low-speed limitation, which comprises a shell (10) and a main shaft (7) arranged in the shell (10), a wheel disc (19) positioned in the middle of the shell (10) is arranged in the middle of the main shaft (7), plunger holes (21) which are uniformly distributed and staggered are formed in two ends of the wheel disc (19), plungers (6) are arranged in the plunger holes (21), and the plungers (6) are arranged in the plunger holes (21). The main shaft (7) is provided with two groups of limiting seats (20) which are symmetrically arranged relative to the wheel disc (19), floating cylinders (4) are arranged on the limiting seats (20) through cylinder seat pins (9), guide grooves (22) corresponding to the plungers (6) are formed in the sides, facing the wheel disc (19), of the floating cylinders (4), chucks (5) for limiting the floating cylinders (4) are arranged at the ends of the guide grooves (22), and limiting sleeves (3) are arranged on the other sides of the floating cylinders (4). The device has the advantages of low pulsation double amplitude and low-rotating-speed stable output.

Description

Technical Field

[0001] The invention relates to a plunger motor device, in particular to a low-pulsation axial plunger motor device without low-speed limitation. Background Art

[0002] With the development of science and technology, the performance quality requirements of hydraulic motors are getting higher and higher, whether they are hydraulic motors in the aviation field or engineering machinery field, especially in terms of low-speed performance. Due to the influence of factors such as pressure pulsation and volumetric efficiency, when the speed is lower than 50r / min, the traditional hydraulic motors, whether they are through-axle piston motors or bevel-axle motors, have obvious disadvantages in low-speed stability. The lower the speed, the worse the stability. Traditional piston motors have poor low-speed stability. When the main engine handle is operated, especially when the main engine is walking or hoisting at low speed, the lower the engine speed or the higher the pressure, the operator lacks the expected feeling of low-speed action, and the user's control experience is poor. Summary of the invention

[0003] The object of the present invention is to provide a low-pulsation axial piston motor device without low-speed limitation, which has the advantages of low pulsation double amplitude and stable output at low speed.

[0004] The technical solution of the present invention: a low-pulsation axial piston motor device without low-speed limit, including a shell and a main shaft arranged in the shell, a wheel disk located in the middle of the shell is provided in the middle of the main shaft, and plunger holes are evenly distributed and staggered at both ends of the wheel disk, and plungers are provided in the plunger holes. Two groups of limit seats symmetrically arranged with the wheel disk are provided on the main shaft, and a floating cylinder is provided on the limit seat through a cylinder seat pin. A guide groove corresponding to the plunger is provided on the inner side of the floating cylinder facing the wheel disk, and a chuck for limiting the floating cylinder is provided at the end of the guide groove, a limit sleeve is provided on the other side of the floating cylinder, a floating cylinder seat is provided on one side of the limit sleeve, and an oil separator fixed at both ends of the length direction in the shell is provided on one side of the floating cylinder seat.

[0005] In the aforementioned low-pulsation axial piston motor device without low-speed restriction, the number of the plunger holes on both sides of the wheel disc is 12 groups, and the offset angle of the plunger holes on the left and right sides of the wheel disc is 15 degrees.

[0006] In the aforementioned low-pulsation axial piston motor device without low-speed restriction, an adjusting gasket for adjusting the gap between the floating cylinder and the floating cylinder seat is provided at the connection between the limiting sleeve and the floating cylinder seat.

[0007] In the aforementioned low-pulsation axial piston motor device without low-speed restriction, a pre-tightening mechanism for pre-tightening the floating cylinder seat is also provided between the limit seat and the floating cylinder.

[0008] In the aforementioned low-pulsation axial piston motor device without low-speed limit, the pre-tightening mechanism includes a ball hinge plate arranged on a limit seat, a wave spring is provided on the side of the ball hinge plate facing the floating cylinder seat, and a retaining ring is provided on one side of the wave spring to press the floating cylinder seat.

[0009] In the aforementioned low-pulsation axial piston motor device without low-speed restriction, one end of the piston is provided with a drum-shaped block corresponding to the guide groove and forming a line contact seal with the guide groove.

[0010] Compared with the prior art, the present invention has the following advantages:

[0011] In the present application, a wheel is provided on the main shaft and located in the middle of the shell. Both ends of the wheel are provided with evenly distributed and staggered plunger holes. The two rows of plungers are designed to face each other, and the number of plungers is significantly increased, which can be 2 to 3 times that of a conventional motor. Moreover, they are staggered with each other, and the double amplitude of the pulsation generated is very low, thereby outputting an unlimited low stable speed. The plunger hole carrier adopts a floating cylinder structure, and the free floating of the floating cylinder can automatically compensate for the accumulated tolerance caused by the parts processing, so that adaptive sealing is achieved between the floating cylinder and the floating cylinder seat. Moreover, compared with traditional motors, the motor has fewer leakage points and higher volumetric efficiency, which will be beneficial to the unlimited low stable speed output of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the present invention;

[0013] Figure 2 It is a partial enlarged view of the present invention;

[0014] Figure 3 It is a structural schematic diagram of the floating cylinder of the present invention;

[0015] Figure 4 It is a structural schematic diagram of the main shaft of the present invention.

[0016] The marks in the attached drawings are: 1-oil distribution plate, 2-floating cylinder seat, 3-limiting sleeve, 4-floating cylinder, 5-chuck, 6-plunger, 7-spindle, 8-oil distribution cover, 9-cylinder seat pin, 10-housing, 11-ball hinge plate, 12-wave spring, 13-retaining ring, 14-drain groove, 15-connecting pipe, 19-wheel plate, 20-limiting seat, 21-plunger hole, 22-guide groove, 23-drum block, 301-adjusting gasket. DETAILED DESCRIPTION

[0017] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0018] Embodiment. A low-pulsation axial piston motor device without low-speed limitation is composed of Figure 1-2As shown, it includes a shell 10 and a main shaft 7 arranged in the shell 10, a wheel disc 19 located in the middle of the shell 10 is provided in the middle of the main shaft 7, and plunger holes 21 are evenly distributed and staggered at both ends of the wheel disc 19, and plungers 6 are arranged in the plunger holes 21, and two groups of limit seats 20 symmetrically arranged with the wheel disc 19 are provided on the main shaft 7, and a floating cylinder 4 is provided on the limit seat 20 through a cylinder seat pin 9, and a guide groove 22 corresponding to the plunger 6 is provided in the floating cylinder 4 on the side facing the wheel disc 19, and a chuck 5 for limiting the floating cylinder 4 is provided at the end of the guide groove 22, and a limit sleeve 3 is provided on the other side of the floating cylinder 4, and a floating cylinder seat 2 is provided on one side of the limit sleeve 3, and an oil separation plate 1 fixed at both ends of the length direction in the shell 10 is provided on one side of the floating cylinder seat 2.

[0019] The number of the plunger holes 21 on both sides of the wheel disc 19 is 12 groups, and the offset angle of the plunger holes 21 on the left and right sides of the wheel disc 19 is 15 degrees.

[0020] An adjusting gasket 301 for adjusting the gap between the floating cylinder 4 and the floating cylinder seat 2 is provided at the connection between the limiting sleeve 3 and the floating cylinder seat 2 .

[0021] A pre-tightening mechanism for pre-tightening the floating cylinder seat 2 is also provided between the limit seat 20 and the floating cylinder 4 .

[0022] The pre-tightening mechanism comprises a ball hinge plate 11 arranged on a limit seat 20 , a wave spring 12 is arranged on the side of the ball hinge plate 11 facing the floating cylinder seat 2 , and a retaining ring 13 for pressing the floating cylinder seat 2 is arranged on one side of the wave spring 12 .

[0023] One end of the plunger 6 is provided with a drum-shaped block 23 corresponding to the guide groove 22 and forming a line contact seal with the guide groove 22 .

[0024] Principle of the present invention: A wheel disc 19 located in the middle of the shell 10 is provided on the main shaft 7 of the present application, and plunger holes 21 for installing the plunger 6 are provided at both ends of the wheel disc 19. The number of plunger holes 21 on both sides is 12 groups, and the plunger holes 21 on both sides are staggered, with a deviation angle of 15°. In this way, the number of plungers can be 2 to 3 times that of a conventional motor, and they are staggered with each other, and the pulsation double amplitude generated is very low. In addition, compared with traditional motors, the motor has fewer leakage points and higher volumetric efficiency, which will be beneficial to the motor outputting unlimited low stable speed.

[0025] The oil of the present application is distributed through the oil distribution plate 1, and enters the guide groove 22 of the float cylinder 4 through the float cylinder seat 2 and the limit sleeve 3. The float cylinder 4 and the float cylinder seat 2 will move together with the main shaft 7. The limit sleeve 3 connects the float cylinder 4 and the float cylinder seat 2 in a floating manner. The float cylinder 4 and the float cylinder seat 2 are designed for static pressure support, which must ensure that the float cylinder slides on the plane of the float cylinder seat 2, but cannot be separated from the float cylinder seat 2, forming a gap δ2. The gap δ2 can be adjusted by adjusting the 301 gasket. When the motor does not enter the high-pressure oil, the float cylinder seat 2 needs to be close to the oil separator 1. The pressing force is transmitted to the float cylinder seat 12 by the main shaft ball 7 and the ball hinge plate 11 compressing the wave spring 12 through the retaining ring 13, so that the float cylinder seat 2 and the oil separator 1 generate a preload. Due to the symmetry of the structural design, the preloads generated on the main shaft balls on the left and right sides can offset each other, so that the bearings are almost not subjected to axial force. The preload can ensure that the specific work of the float cylinder seat 2 and the oil separator 1 is small when the motor inlet pressure is low, and the float cylinder seat 2 can be separated from the oil separator 1, so that the reliability is better.

Claims

1. A low-pulsation axial piston motor device without low-speed limitation, characterized in that: The invention comprises a housing (10) and a main shaft (7) arranged in the housing (10); a wheel disc (19) located in the middle of the housing (10) is arranged in the middle of the main shaft (7); plunger holes (21) evenly distributed and staggered are arranged at both ends of the wheel disc (19); a plunger (6) is arranged in the plunger hole (21); two groups of limit seats (20) symmetrically arranged with the wheel disc (19) are arranged on the main shaft (7); a floating cylinder (4) is arranged on the limit seat (20) through a cylinder seat pin (9); a guide groove (22) corresponding to the plunger (6) is arranged in the floating cylinder (4) on the side facing the wheel disc (19); a chuck (5) for limiting the floating cylinder (4) is arranged at the end of the guide groove (22); a limit sleeve (3) is arranged on the other side of the floating cylinder (4); a floating cylinder seat (2) is arranged on one side of the limit sleeve (3); and an oil distribution plate (1) fixed to both ends of the length direction in the housing (10) is arranged on one side of the floating cylinder seat (2).

2. The low-pulsation axial piston motor device without low-speed limitation according to claim 1, characterized in that: The number of the plunger holes (21) on both sides of the wheel disc (19) is 12 groups, and the offset angle of the plunger holes (21) on the left and right sides of the wheel disc (19) is 15 degrees.

3. The low-pulsation axial piston motor device without low-speed limitation according to claim 1, characterized in that: An adjusting gasket (301) for adjusting the gap between the floating cylinder (4) and the floating cylinder seat (2) is provided at the connection between the limiting sleeve (3) and the floating cylinder seat (2).

4. The low-pulsation axial piston motor device without low-speed limitation according to claim 1, characterized in that: A pre-tightening mechanism for pre-tightening the floating cylinder seat (2) is also provided between the limit seat (20) and the floating cylinder (4).

5. The low-pulsation axial piston motor device without low-speed limitation according to claim 4, characterized in that: The pre-tightening mechanism comprises a ball hinge (11) arranged on a limit seat (20), a wave spring (12) is arranged on the side of the ball hinge (11) facing the floating cylinder seat (2), and a retaining ring (13) is arranged on one side of the wave spring (12) for pressing the floating cylinder seat (2).

6. The low-pulsation axial piston motor device without low-speed limitation according to claim 1, characterized in that: One end of the plunger (6) is provided with a drum-shaped block (23) corresponding to the guide groove (22) and forming a line contact seal with the guide groove (22).

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