A high-speed hydraulic motor

Abstract

A high-speed hydraulic motor relates to the technical field of hydraulic motors, and comprises a rear housing, a front housing, a gear I, a gear I shaft, an output gear shaft, a gear II and a gear II shaft. The rear housing is connected to the front housing, an output gear shaft mounting hole is provided in the front housing, a gear I shaft hole and a gear II shaft hole are symmetrically provided on both sides of the output gear shaft mounting hole, the output gear shaft rotatably passes through the output gear shaft mounting hole, the gear I shaft and the gear II shaft are respectively fixed in the gear I shaft hole and the gear II shaft hole, an output gear is provided on the output gear shaft, and the gear I and the gear II are symmetrically meshed on both sides of the output gear. The high-speed hydraulic motor has balanced force, relatively large torque, stable operation, convenient processing, easy control of processing and assembly precision, and low failure rate.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic motors, and in particular to a high-speed hydraulic motor. Background Art

[0002] A hydraulic motor is a hydraulic actuator that performs continuous rotary motion and outputs torque in hydraulic transmission. The structure of a traditional gear motor is mostly a pair of meshing gears inside, with the shaft of one gear serving as the output shaft. This traditional gear motor often has the following disadvantages: small starting torque; unilateral force on the output shaft causes unstable starting and operation, and long-term use will cause wear or even failure of the output shaft; the gears in the traditional gear motor are mostly supported on the front cover and the rear cover at both ends, and the processing and assembly accuracy are not easy to ensure, and the concentricity is not easy to control, resulting in a relatively high failure rate and inconvenient installation; the traditional way to change the displacement of the gear motor is generally to increase the gear length or increase the gear module, which inevitably increases the overall size of the gear motor; the gear hydraulic motors widely used in hydraulic motors are mostly medium and low speed motors, and the two ends of their gears are mostly supported by bearings, which makes the overall size of the motor larger and is not suitable for use in some occasions with strict space requirements. Generally, the service life of bearings is short under high temperature, high speed, high load, and high frequency vibration, which in turn affects the overall service life of the hydraulic motor. When the gear hydraulic motor is running, a closed cavity at the root of the tooth will be formed during the meshing process of the two gears, thereby forming a closed high pressure. Since the gear meshing has a certain gap, the closed high pressure can be released from the gap when the gear rotates at a low speed, but the high pressure will not be released in time when the gear rotates at a high speed, which will cause damage to the root of the tooth. Summary of the invention

[0003] In order to solve one or more of the above technical problems, the present invention provides a high-speed hydraulic motor with balanced force, relatively large torque, stable operation, convenient processing, easy control of processing and assembly precision, and low failure rate.

[0004] The present invention is achieved through the following technical solutions:

[0005] A high-speed hydraulic motor, characterized in that it includes a rear housing, a front housing, a gear I, a gear I shaft, an output gear shaft, a gear II and a gear II shaft, the output gear shaft includes a shaft body A and an output gear, the rear housing is connected to the front housing, an output gear shaft mounting hole is provided in the front housing, a gear I shaft hole and a gear II shaft hole are symmetrically provided on both sides of the output gear shaft mounting hole, the shaft body A of the output gear shaft can rotatably pass through the output gear shaft mounting hole, the gear I shaft and the gear II shaft are respectively fixed in the gear I shaft hole and the gear II shaft hole, a gear I cavity, an output gear cavity and a gear II cavity are provided in the front housing, gear I is provided in the gear I cavity and rotatably sleeved on the gear I shaft, gear II is provided in the gear II cavity and rotatably sleeved on the gear II shaft, the output gear is provided in the output gear cavity, gear I and gear II are symmetrically meshed on both sides of the output gear; and also includes a driving oil circuit for driving gear I, gear II and the output gear to rotate from both sides of the output gear at the same time.

[0006] In another aspect of the present invention, an output shaft is further included. The output shaft is rotatably mounted on the front housing through a support bearing, and the output shaft is connected to the shaft body A of the output gear shaft.

[0007] In another aspect of the present invention, the driving oil circuit includes an oil inlet, an oil inlet distribution passage, a rear housing oil inlet passage I, a rear housing oil inlet passage II, an oil return port, an oil return merging passage, a rear housing oil return passage I, a rear housing oil return passage II, and a front housing oil inlet passage I, a front housing oil return passage I, a front housing oil inlet passage II, and a front housing oil return passage II, the oil inlet is connected to the rear housing oil inlet passage I and the rear housing oil inlet passage II through the oil inlet distribution passage, and the oil return port is connected to the rear housing oil return passage I and the rear housing oil return passage II through the oil return merging passage; The front housing oil inlet passage I and the front housing oil return passage I are respectively connected to the two sides of the meshing place of gear I and the output gear; the front housing oil inlet passage II is connected to the side far away from the front housing oil inlet passage I on both sides of the meshing place of gear II and the output gear, and the front housing oil return passage II is connected to the side close to the front housing oil inlet passage I on both sides of the meshing place of gear II and the output gear; the front housing oil inlet passage I is connected to the rear housing oil inlet passage I, the front housing oil return passage I is connected to the rear housing oil return passage I, the front housing oil inlet passage II is connected to the rear housing oil inlet passage II, and the front housing oil return passage II is connected to the rear housing oil return passage II.

[0008] In another aspect of the present invention, it also includes a unloading groove I, a unloading groove II, a unloading groove III, and a unloading groove IV, wherein the unloading groove I is located at a side of the meshing place between the gear II and the output gear, close to the front shell oil return passage II, and is communicated with the front shell oil return passage II, the unloading groove II is located at a side of the meshing place between the gear II and the output gear, close to the front shell oil inlet passage II, and is communicated with the front shell oil inlet passage II, the unloading groove III is located at a side of the meshing place between the gear I and the output gear, close to the front shell oil inlet passage I, and is communicated with the front shell oil inlet passage I, the unloading groove IV is located at a side of the meshing place between the gear I and the output gear, close to the front shell oil return passage I, and is communicated with the front shell oil return passage I, each unloading groove includes a front half groove and a rear half groove which are symmetrical to each other, the front half groove is opened in the front shell body, and the rear half groove is opened on the front end surface of the rear shell body, and each unloading groove is connected to the top tooth root backlog space generated when the gears are meshed.

[0009] In another aspect of the present invention, a sealing structure is installed between the shaft body A of the output gear shaft and the front housing, and the shaft body A rotatably passes through the sealing structure, and the sealing structure is located in front of the output gear.

[0010] The beneficial effects of the present invention are: balanced force, relatively large torque, stable operation, convenient processing, easy control of processing and assembly precision, and low failure rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the longitudinal cross-sectional structure of an embodiment of the present invention.

[0012] Figure 2 It is a schematic diagram of the transverse cross-sectional structure of the oil inlet distribution channel according to an embodiment of the present invention.

[0013] Figure 3 It is a schematic diagram of the transverse cross-sectional structure of the oil return and oil converging passages according to an embodiment of the present invention.

[0014] Figure 4 It is a mating end view of the front shell after the rear shell is removed according to an embodiment of the present invention (the dotted line portion is a schematic diagram of the positions of relief grooves I, II, III, and IV).

[0015] Figure 5 It is a longitudinal sectional view of the front shell of an embodiment of the present invention.

[0016] Figure 6 1 is a diagram showing the connection relationship between the rear housing and the front housing according to an embodiment of the present invention.

[0017] In the attached drawings: 1, rear housing, 2, front housing, 3, gear I, 4, gear I shaft, 5, output gear, 6, gear II, 7, gear II shaft, 8, sealing structure, 9, support bearing, 10, output shaft, 11, shaft body A, 201, gear I cavity, 202, output gear cavity, 203, gear II cavity, 204, gear I shaft hole, 205, output gear shaft mounting hole, 206, gear II shaft hole, 207, bearing seat hole , a1, oil inlet, a2, oil inlet distribution channel, a3, rear shell oil inlet channel Ⅰ, a4, rear shell oil inlet channel Ⅱ, a5, front shell oil inlet channel Ⅰ, a6, front shell oil inlet channel Ⅱ, b1, oil return port, b2-oil return and merging channel, b3, rear shell oil return channel Ⅰ, b4, rear shell oil return channel Ⅱ, b5, front shell oil return channel Ⅰ, b6, front shell oil return channel Ⅱ, c1, unloading groove Ⅰ, c2, unloading groove Ⅱ, c3, unloading groove Ⅲ, c4, unloading groove Ⅳ. DETAILED DESCRIPTION

[0018] The following is a further description of the embodiments of the present invention in conjunction with the accompanying drawings and embodiments:

[0019] In the description of the present invention, it is necessary to understand that the description indicating the orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention.

[0020] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Example 1

[0021] A high-speed hydraulic motor comprises a rear housing 1, a front housing 2, a gear I 3, a gear I shaft 4, an output gear shaft, a gear II 6 and a gear II shaft 7, wherein the output gear shaft comprises a shaft body A11 and an output gear 5, wherein the shaft body A11 and the output gear 5 are an integral structure, wherein the rear housing 1 and the front housing 2 are connected together by bolts, wherein an output gear shaft mounting hole 205 is provided at a central position in the front housing, wherein gear I shaft holes 204 and gear II shaft holes 206 are symmetrically provided on both sides of the output gear shaft mounting hole 205, wherein the front portion of the shaft body A11 of the output gear shaft rotatably passes through the output gear shaft mounting hole 205, wherein the front portion of the shaft body A11 of the output gear shaft is connected to ... The output gear shaft mounting holes 205 are clearance-fitted, the gear I shaft 4 and the gear II shaft 7 are fixed in the gear I shaft hole 204 and the gear II shaft hole 206 respectively, the front housing 2 is provided with a gear I cavity 201, an output gear cavity 202, and a gear II cavity 203, the gear I3 is arranged in the gear I cavity 201 and rotatably sleeved on the gear I shaft 4, the gear II6 is arranged in the gear II cavity 203 and rotatably sleeved on the gear II shaft 7, the output gear 5 is arranged in the output gear cavity 202, the gear I3 and the gear II6 are symmetrically meshed on both sides of the output gear 5; and also includes a driving oil circuit that drives the gear I3, the gear II6 and the output gear 5 to rotate from both sides of the output gear 5 at the same time. Also includes an output shaft 10, the output shaft 10 is rotatably mounted on the front housing 2 through a support bearing 9, and the output shaft 10 is connected to the shaft body A11 of the output gear shaft through a straight key to transmit power. A sealing structure is installed between the shaft body A11 of the output gear shaft and the front housing 2. The shaft body A11 can rotatably pass through the sealing structure. The sealing structure is located in front of the output gear 5. In this embodiment, the sealing structure adopts a sealing groove and a sealing ring placed in the sealing groove.The driving oil circuit includes an oil inlet a1, an oil inlet distribution passage a2, a rear shell oil inlet passage Ⅰa3, a rear shell oil inlet passage Ⅱa4, an oil return port b1, an oil return merging passage b2, a rear shell oil return passage Ⅰb3, a rear shell oil return passage Ⅱb4, and a front shell oil inlet passage Ⅰa5, a front shell oil return passage Ⅰb5, a front shell oil inlet passage Ⅱa6, and a front shell oil return passage Ⅱb6, which are opened in the front shell 2. The oil inlet a1 is connected to the rear shell oil inlet passage Ⅰa3 and the rear shell oil inlet passage Ⅱa4 through the oil inlet distribution passage a2, and the oil return port b1 is connected to the rear shell oil return passage Ⅰb3 and the rear shell oil return passage Ⅱb4 through the oil return merging passage b2; the front shell The oil inlet passage Ⅰa5 and the front housing oil return passage Ⅰb5 are respectively connected at both sides of the meshing place of the gear Ⅰ3 and the output gear 5; the front housing oil inlet passage Ⅱa6 is connected at the side far away from the front housing oil inlet passage Ⅰa5 on both sides of the meshing place of the gear Ⅱ6 and the output gear 5, and the front housing oil return passage Ⅱb6 is connected at the side close to the front housing oil inlet passage Ⅰa5 on both sides of the meshing place of the gear Ⅱ6 and the output gear 5; the front housing oil inlet passage Ⅰa5 is connected to the rear housing oil inlet passage Ⅰa3, the front housing oil return passage Ⅰb5 is connected to the rear housing oil return passage Ⅰb3, the front housing oil inlet passage Ⅱa6 is connected to the rear housing oil inlet passage Ⅱa4, and the front housing oil return passage Ⅱb6 is connected to the rear housing oil return passage Ⅱb4. It also includes a unloading groove Ic1, a unloading groove IIc2, a unloading groove IIIc3, and a unloading groove IVc4, wherein the unloading groove I is located at a side of the meshing place of the gear II6 and the output gear 5, close to the side of the front shell oil return passage IIb6, and is communicated with the front shell oil return passage IIb6, the unloading groove II is located at a side of the meshing place of the gear II6 and the output gear 5, close to the side of the front shell oil inlet passage IIa6, and is communicated with the front shell oil inlet passage IIa6, the unloading groove III is located at a side of the meshing place of the gear I3 and the output gear 5, close to the side of the front shell oil inlet passage Ia5, and is communicated with the front shell oil inlet passage Ia5, the unloading groove IV is located at a side of the meshing place of the gear I3 and the output gear 5, close to the side of the front shell oil return passage Ib5, and is communicated with the front shell oil return passage Ib5, each unloading groove includes a front half groove and a rear half groove which are symmetrical to each other, the front half groove is opened in the front shell 2, and the rear half groove is opened on the front end surface of the rear shell 1, and each unloading groove is connected to the top tooth root backlog space generated when the gears are meshed.

[0022] The working principle of this high-speed hydraulic motor is as follows: high-pressure oil enters the oil inlet channel a2 through the oil inlet port a1; then enters the front shell oil inlet channel Ⅰa5 through the rear shell oil inlet channel Ⅰa3, and enters the front shell oil inlet channel Ⅱa6 through the rear shell oil inlet channel Ⅱa4; the hydraulic oil in the front shell oil inlet channel Ⅰa5 enters one side of the meshing point between the gear Ⅰ3 and the output gear 5 and is discharged into the front shell oil return channel Ⅰb5 and the front shell oil return channel Ⅱb6 during the rotation of the gear Ⅰ3 and the output gear. At the same time, the front shell oil inlet channel Ⅱa The hydraulic oil in 6 enters one side of the meshing point between gear Ⅱ6 and output gear 5 and is discharged into the front housing oil return passage Ⅰb5 and the front housing oil return passage Ⅱb6 during the rotation of gear Ⅱ6 and the output gear. The hydraulic oil discharged into the front housing oil return passage Ⅰb5 and the front housing oil return passage Ⅱb6 enter the return merging oil passage b2 through the rear housing oil return passage Ⅰb3 and the rear housing oil return passage Ⅰb4 respectively. The oil in the return merging oil passage b2 is discharged through the return oil port b1 connected thereto. The oil inlet and outlet process drives the gear to rotate and output power.

[0023] This high-speed hydraulic motor is suitable for field operation, compact in size, and suitable for supporting engineering machinery; the radial forces of the symmetrically arranged gears I and II on the output gear shaft offset each other, making the motor work more smoothly and having a long service life; the three gears are all installed on the front housing, and the processing and assembly accuracy are easy to ensure, and the processing is convenient; the unloading groove is set to release the backlog generated when the gears work at high speed, making the gear motor more suitable for high-speed rotation; when this high-speed hydraulic motor is started, gears I and II act on the output gear shaft at the same time, making the starting torque of this high-speed hydraulic motor larger; the gears in this high-speed hydraulic motor Ⅰ is directly sleeved on gear Ⅰ shaft 4, and gear Ⅱ is directly sleeved on gear Ⅱ shaft 7. Compared with the connection structure of fixing the rotating shaft by two concentric bearings and fixing the gears on the rotating shaft, this gear connection structure avoids the adverse effect of the large concentricity error of the two bearings on the accuracy, making the accuracy easier to control, the installation error is small, the failure rate is low, and the processing is more convenient. Since gear Ⅰ shaft 4 and gear Ⅱ shaft 7 do not need to rotate, the torque required for starting this high-speed hydraulic motor is small, which further increases the starting torque output by the output shaft 10; this high-speed hydraulic motor has a compact overall structure and is suitable for supporting engineering machinery.

[0024] In conclusion, the above is only a preferred embodiment of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the patent of the present invention.

Claims

1. A high-speed hydraulic motor, characterized in that: The invention comprises a rear housing (1), a front housing (2), a gear I (3), a gear I shaft (4), an output gear shaft, a gear II (6) and a gear II shaft (7), wherein the output gear shaft comprises a shaft body A (11) and an output gear (5), the rear housing (1) and the front housing (2) are connected together, an output gear shaft mounting hole (205) is provided in the front housing, and gear I shaft holes (204) and gear II shaft holes (206) are symmetrically provided on both sides of the output gear shaft mounting hole (205), the shaft body A (11) of the output gear shaft can rotatably pass through the output gear shaft mounting hole (205), the gear I shaft (4) and the gear II shaft (7) are respectively fixed to the gear I shaft. The front housing (2) is provided with a gear I cavity (201), an output gear cavity (202), and a gear II cavity (203) in the shaft hole (204) and the gear II shaft hole (206); the gear I (3) is arranged in the gear I cavity (201) and is rotatably sleeved on the gear I shaft (4); the gear II (6) is arranged in the gear II cavity (203) and is rotatably sleeved on the gear II shaft (7); the output gear (5) is arranged in the output gear cavity (202); the gear I (3) and the gear II (6) are symmetrically meshed on both sides of the output gear (5); and the drive oil circuit is also included for driving the gear I (3), the gear II (6), and the output gear (5) to rotate from both sides of the output gear (5); The driving oil circuit comprises an oil inlet (a1), an oil inlet distribution passage (a2), a rear housing oil inlet passage I (a3), a rear housing oil inlet passage II (a4), an oil return port (b1), an oil return merging passage (b2), a rear housing oil return passage I (b3), a rear housing oil return passage II (b4), and a front housing oil inlet passage I (a5), a front housing oil return passage I (b5), a front housing oil inlet passage II (a6), and a front housing oil return passage II (b6) arranged in the front housing (2); the oil inlet (a1) is connected to the rear housing oil inlet passage I (a3) ​​and the rear housing oil inlet passage II (a4) via the oil inlet distribution passage (a2); the oil return port (b1) is connected to the rear housing oil return passage I (b3) and the rear housing oil return passage II (b4) via the oil return merging passage (b2); The front housing oil inlet passage I (a5) and the front housing oil return passage I (b5) are respectively connected to the two sides of the meshing position of the gear I (3) and the output gear (5); the front housing oil inlet passage II (a6) is connected to the side of the meshing position of the gear II (6) and the output gear (5) that is away from the front housing oil inlet passage I (a5), and the front housing oil return passage II (b6) is connected to the side of the meshing position of the gear II (6) and the output gear (5) that is close to the front housing oil inlet passage I (a5); the front housing oil inlet passage I (a5) is connected to the rear housing oil inlet passage I (a3), the front housing oil return passage I (b5) is connected to the rear housing oil return passage I (b3), the front housing oil inlet passage II (a6) is connected to the rear housing oil inlet passage II (a4), and the front housing oil return passage II (b6) is connected to the rear housing oil return passage II (b4).

2. A high-speed hydraulic motor according to claim 1, characterized in that: It also includes an output shaft (10), which is rotatably mounted on the front housing (2) via a support bearing (9), and the output shaft (10) is connected to a shaft body A (11) of an output gear shaft.

3. A high-speed hydraulic motor according to claim 1, characterized in that: The gear train also includes a relief groove I, a relief groove II, a relief groove III, and a relief groove IV. The relief groove I is located at a side of the meshing position between the gear II (6) and the output gear (5) close to the front housing oil return passage II (b6) and is communicated with the front housing oil return passage II (b6). The relief groove II is located at a side of the meshing position between the gear II (6) and the output gear (5) close to the front housing oil inlet passage II (a6) and is communicated with the front housing oil inlet passage II (a6). The relief groove III is located at a side of the meshing position between the gear I (3) and the output gear (5) close to the front housing oil return passage II (b6). The unloading groove IV is located at one side of the housing oil inlet passage I (a5) and is connected to the front housing oil inlet passage I (a5); the unloading groove IV is located at one side of the meshing position between the gear I (3) and the output gear (5) and is close to the front housing oil return passage I (b5) and is connected to the front housing oil return passage I (b5); each unloading groove comprises a front half groove and a rear half groove which are symmetrical to each other; the front half groove is opened in the front housing (2), and the rear half groove is opened on the front end surface of the rear housing (1); each unloading groove is connected to the top tooth root accumulated space generated when the gears are meshed.

4. A high-speed hydraulic motor according to claim 1, 2 or 3, characterized in that: A sealing structure (8) is installed between the shaft body A (11) of the output gear shaft and the front housing (2), and the shaft body A (11) can rotatably pass through the sealing structure. The sealing structure is located in front of the output gear (5).

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