Speed limiting motor for hydraulic pressure boosting device

Abstract

The utility model belongs to the technical field of special hydraulic elements, and particularly relates to a speed limiting motor for a hydraulic pressure boosting device. Comprising a shell, a transmission shaft, a swash plate, a base plate, a plunger, a rotor, a valve plate, a rear cover, an oil inlet, an oil outlet, a damping hole, a high-pressure oil inlet groove, a low-pressure oil discharge hole and a low-pressure oil discharge groove. The device has the advantages of being simple in structure, small in size, light in weight, simple in interface, explosion-proof and good in electromagnetic compatibility, can be connected with a high-pressure pump only through several screws, takes an existing high-pressure medium as power, takes the hydraulic motor as a driving device, avoids the problem of introduction of secondary energy, and is suitable for large-scale popularization and application. And the hydraulic pressure boosting device can continuously output the high-pressure medium.

Description

Technical Field

[0001] The utility model belongs to the technical field of special hydraulic components, and particularly relates to a speed-limiting motor for a liquid-driven boosting device. Background Art

[0002] With the development of the times and the progress of technology, the output pressure of hydraulic systems is gradually increasing. Especially in the aviation field, the increase in system pressure means a reduction in system weight. For some fighter jets, it is very difficult to achieve high pressure for the whole aircraft hydraulic system, which involves aspects such as the life of the main hydraulic pump, the sealing, vibration, and pipeline strength of the hydraulic system. However, for some subsystems with limited structural space and strict requirements, the technology of local boosting can further reduce the volume and greatly reduce the weight of the actuator.

[0003] Traditional boosting methods include using an electric motor to drive a booster pump. Although the high-pressure electric pump is small in size and light in weight, it requires secondary energy and needs to be connected to a power source, which increases the interfaces, reduces the system reliability, environmental adaptability, and electromagnetic compatibility, and increases the system maintenance cost. Since the flow rate at the high-pressure medium input port is much larger than the flow rate required by the speed-limiting motor, and the pressure at the output port of the high-pressure pump changes continuously, if the hydraulic motor is not speed-limited, the hydraulic motor and the high-pressure pump will be damaged due to overspeed. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a speed-limiting motor for a liquid-driven boosting device.

[0005] To achieve the above purpose, the utility model provides the following technical solution: The speed-limiting motor includes a housing, a transmission shaft, a swash plate, a backing plate, a plunger, a rotor, a valve plate, a rear cover, an oil inlet, an oil outlet, a damping hole, a high-pressure oil inlet groove, a low-pressure oil drain hole, and a low-pressure oil drain groove;

[0006] One end of the transmission shaft is installed on the housing, and the other end is installed on the rear cover; the backing plate and the swash plate are fixed in the circumferential direction, the plunger is arranged closely against the backing plate, and at the same time, the plunger is inserted into the rotor, and the rotor is connected to the transmission shaft;

[0007] The rear cover is provided with the oil inlet and the oil outlet; the high-pressure oil inlet groove is arranged on the high-pressure side of the valve plate, the high-pressure oil inlet groove communicates with the oil inlet on the rear cover, and the other side communicates with the plunger hole of the rotor; the valve plate is provided with a low-pressure oil drain hole on the low-pressure side, one side of the low-pressure oil drain hole communicates with the housing, and the other side communicates with the oil outlet on the rear cover; the backing plate is provided with a low-pressure oil drain groove communicating with the inner cavity of the housing; the plunger is designed with a damping hole.

[0008] Further, the speed-limiting motor is connected to the hydraulic pump through the spline at the tail of the transmission shaft. A static seal is adopted between the speed-limiting motor and the hydraulic pump, and the hydraulic medium in the housing directly enters the housing of the hydraulic pump.

[0009] Further, the rotor is connected to the transmission shaft through splines.

[0010] Further, the high-pressure oil inlet groove and the low-pressure oil drain groove are waist-shaped grooves.

[0011] Further, the backing plate is fixed to the swash plate through a positioning pin.

[0012] Further, the plunger is inserted into the rotor to form a plunger cavity.

[0013] Further, the housing is connected to the rear cover by screws.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows: (1) The present utility model adopts a hydraulic motor, eliminating the access of secondary energy. The speed-limiting motor and the high-pressure pump are arranged in a coaxial series manner, and the rotary seal at the tail of the shaft is cancelled; (2) In the present utility model, damping holes are provided in the plungers of the speed-limiting motor and low-pressure oil drain grooves are opened on the backing plate, cancelling the oil drain waist-shaped grooves of the flow distribution plate, so that when the speed-limiting motor is under low load, the speed-limiting motor does not accelerate and rotate to cause damage; (3) The present utility model realizes the speed limitation of the hydraulic motor by only changing the shapes of the original parts of the hydraulic motor without increasing the types of parts, ensuring that it does not run at an overspeed, and has good economy.

[0015] To more clearly illustrate the functional characteristics and structural parameters of the present utility model, the following further description is provided in conjunction with the drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present utility model and constitute a part of this application. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0017] Figure 1 is the structural diagram of the speed-limiting motor of the present utility model;

[0018] Figure 2 is the structural diagram of the plunger of the speed-limiting motor of the present utility model;

[0019] Figure 3 is the structural diagram of the flow distribution plate of the speed-limiting motor of the present utility model;

[0020] Figure 4 is the structural diagram of the backing plate of the speed-limiting motor of the present utility model.

[0021] The reference numerals in the figure are: 1 - housing, 2 - transmission shaft, 3 - swash plate, 4 - backing plate, 5 - plunger, 6 - rotor, 7 - valve plate, 8 - rear cover, 9 - oil inlet, 10 - oil outlet, 11 - damping hole, 12 - high-pressure oil inlet groove, 13 - low-pressure oil drain hole, 14 - low-pressure oil drain groove. Detailed implementation manners

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] A speed-limiting motor for a liquid-driven pressure boosting device of the present invention includes a housing 1, a transmission shaft 2, a swash plate 3, a backing plate 4, a plunger 5, a rotor 6, a valve plate 7, a rear cover 8, an oil inlet 9, an oil outlet 10, a damping hole 11, a high-pressure oil inlet groove 12, a low-pressure oil drain hole 13, and a low-pressure oil drain groove 14;

[0024] One end of the transmission shaft 2 is installed on the housing 1, and the other end is installed on the rear cover 8; the backing plate 4 and the swash plate 3 are fixed in the circumferential direction, the plunger 5 is arranged close to the backing plate 4, and at the same time the plunger 5 is inserted into the rotor 6, and the rotor 6 is connected to the transmission shaft 2;

[0025] The rear cover 8 is provided with the oil inlet 9 and the oil outlet 10; the high-pressure oil inlet groove 12 is arranged on the high-pressure side of the valve plate 7, the high-pressure oil inlet groove 12 communicates with the oil inlet 9 of the rear cover 8, and the other side communicates with the plunger hole of the rotor 6; the valve plate 7 is provided with a low-pressure oil drain hole 13 on the low-pressure side, one side of the low-pressure oil drain hole 13 communicates with the housing 1, and the other side communicates with the oil outlet 10 of the rear cover 8; the backing plate 4 is provided with a low-pressure oil drain groove 14 communicating with the inner cavity of the housing 1; the plunger 5 is designed with a damping hole 11.

[0026] The speed-limiting motor is connected to the hydraulic pump through the spline at the tail of the transmission shaft 2, and a static seal is adopted between the speed-limiting motor and the hydraulic pump, and the hydraulic medium of the housing 1 directly enters the hydraulic pump housing.

[0027] Further, the rotor 6 and the transmission shaft 2 are connected by splines.

[0028] Further, the high-pressure oil inlet groove 12 and the low-pressure oil drain groove 14 are kidney-shaped grooves.

[0029] Further, the backing plate 4 and the swash plate 3 are fixed by a positioning pin.

[0030] Further, the plunger 5 is inserted into the rotor 6 to form a plunger chamber.

[0031] Further, the housing 1 and the rear cover 8 are connected by screws.

[0032] The principle of this application is that the high-pressure medium enters through the oil inlet 9, passes through the rear cover 8 and the distributor plate 7 in sequence, and enters the plunger chamber of the rotor 6. The plunger 5 generates a rotational torque that causes the rotor 6 to rotate under the action of high-pressure oil. While the plunger 5 closely adheres to the backing plate 4 and axially rotates along the inclined disk 3 surface, it reciprocates and expands in the plunger hole of the rotor 6. The rotor 6 rotates at high speed under the action of the rotational torque of the plunger 5. The rotor 6 is connected to the transmission shaft 2 through a spline and drives it to rotate and output torque outward.

[0033] The high-pressure medium passes through the rear cover 8 and the distributor plate 7 through the oil inlet 9, and finally enters the plunger chamber of the rotor 6, and pushes the plunger 5 to move in the direction of increasing the volume of the plunger chamber. The rotor 6 rotates driven by the plunger 5. When the plunger 5 moves to the bottom dead center of the inclined disk 3, the volume of the plunger chamber of the rotor 6 is the largest. As the rotor continues to rotate, the plunger 5 moves in the direction of reducing the volume of the plunger chamber of the rotor 6. The medium in the plunger chamber flows into the low-pressure oil drain groove 14 of the backing plate 4 through the damping hole 11 of the plunger 5. The low-pressure oil drain groove 14 of the backing plate 4 communicates with the inner cavity of the housing 1. The liquid medium finally enters the low-pressure oil drain hole 13 of the distributor plate 7 and finally discharges from the oil outlet 10 of the rear cover 8. When the load of the speed-limiting motor is small, the speed-limiting motor will accelerate. Since the damping hole 11 is designed on the plunger 5 and the distributor plate is not designed with a low-pressure oil drain groove symmetrically distributed with the high-pressure oil inlet groove 12, the oil in the plunger chamber in the oil discharge area can only slowly flow into the low-pressure oil drain groove 14 of the backing plate 4 through the damping hole 11 of the plunger 5, and the pressure in the plunger chamber will increase accordingly, forming a counter-torque that hinders the rotation of the speed-limiting motor until the speed-limiting motor stops accelerating, restricting the speed-limiting motor and the driven hydraulic pump from rotating at high speed and preventing them from being damaged at high speed, ensuring the stable operation of the boosting device.

[0034] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0035] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A speed-limited motor for a hydraulically driven booster device, characterized in that: It comprises a housing (1), a transmission shaft (2), a swash plate (3), a gasket (4), a plunger (5), a rotor (6), a distribution plate (7), a rear cover (8), an oil inlet (9), an oil outlet (10), a damping hole (11), a high-pressure oil inlet groove (12), a low-pressure oil discharge hole (13), and a low-pressure oil discharge groove (14); One end of the transmission shaft (2) is mounted on the housing (1), and the other end is mounted on the rear cover (8); the pad (4) and the swash plate (3) are fixed in the circumferential direction, the plunger (5) is arranged close to the pad (4), and the plunger (5) is installed in the rotor (6), and the rotor (6) is connected to the transmission shaft (2); The rear cover (8) is provided with the oil inlet (9) and the oil outlet (10); the high-pressure oil inlet groove (12) is provided on the high-pressure side of the distribution plate (7), the high-pressure oil inlet groove (12) is communicated with the oil inlet (9) of the rear cover (8), and the other side is communicated with the plunger hole of the rotor (6); the distribution plate (7) is provided with the low-pressure oil drain hole (13) on the low-pressure side, one side of the low-pressure oil drain hole (13) is communicated with the housing (1), and the other side is communicated with the oil outlet (10) of the rear cover (8); the pad (4) is provided with the low-pressure oil drain groove (14) which is communicated with the inner cavity of the housing (1); the plunger (5) is designed with the damping hole (11).

2. A speed-limited motor for a hydraulically driven booster device as claimed in claim 1, characterized in that: The speed limiting motor is connected to the hydraulic pump via the shaft tail spline of the transmission shaft (2), a static seal is used between the speed limiting motor and the hydraulic pump, and the hydraulic medium of the housing (1) directly enters the housing of the hydraulic pump.

3. A speed-limited motor for a hydraulically driven booster device as claimed in claim 1, characterized in that: The rotor (6) is connected to the transmission shaft (2) via a spline.

4. A speed-limited motor for a hydraulically driven booster device as claimed in claim 1, characterized in that: The high-pressure oil inlet groove (12) and the low-pressure oil discharge groove (14) are waist-shaped grooves.

5. A speed-limited motor for a hydraulically driven booster device as claimed in claim 1, characterized in that: The pad (4) and the swash plate (3) are fixed via positioning pins.

6. A speed-limited motor for a hydraulically driven booster device as claimed in claim 1, characterized in that: The plunger (5) is inserted into the rotor (6) to form a plunger cavity.

7. A speed-limited motor for a hydraulically driven booster device as claimed in claim 1, characterized in that: The housing (1) and the rear cover (8) are connected via screws.

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