Highly compact semi-dry casing inline twin pump motor

Abstract

The application belongs to the technical field of closed hydraulic transmission, and particularly relates to a high-compact semi-dry type shell inline pump motor, wherein a liquid circuit is divided into six parts according to layout function features, and the six parts are a pump assembly (1), an oil circuit assembly (2), a high-pressure safety valve assembly (3), a motor assembly (4), a flushing cooling valve assembly (5) and a variable control mechanism assembly (6). The oil circuit assembly is taken as a center, the pump and the motor are arranged along a horizontal axis direction, the high-pressure safety valve assembly and the flushing cooling valve assembly are arranged along a vertical axis direction, the variable control mechanism of the pump is directly connected with the pump, and the oil circuit assembly comprises internal oil channels and control valves, which are used for connecting each part and exchanging oil with the outside. The application has the advantages of simple layout, clear function, compact structure and good environmental adaptability, and is suitable for the field of stepless speed transmission and has a positive significance for improving power density.

Description

Technical Field

[0001] This invention belongs to the field of closed hydraulic transmission technology, specifically relating to a highly compact semi-dry housing inline pump motor. Background Technology

[0002] Currently, hydraulic transmission systems are widely used in industries such as vehicles, ships, and construction machinery. The hydraulic piston pump motor involved is a core component, characterized by high speed and high pressure.

[0003] Integrated pump-motor systems are a type of complex component with independent functions in hydraulic transmission systems. The hydraulic pump and motor are integrated through a manifold and housing, featuring a compact structure, reliability, and ease of installation. This makes them particularly suitable for applications with high space and reliability requirements, such as continuously variable transmissions (CVTs) in vehicles, winch reels, and tank steering drives. Taking a plunger-type hydraulic pump-motor as an example, the working principle of an integrated pump-motor is as follows: Driven by a prime mover, the hydraulic plunger pump converts mechanical energy into hydraulic energy. The pump input shaft drives the rotor cylinder to rotate, and the plunger reciprocates within the plunger bore of the cylinder, forcing high-pressure oil into the working pipeline of the manifold. Meanwhile, the plunger motor converts hydraulic energy into mechanical energy, receiving the high-pressure oil from the working pipeline and driving the plunger to reciprocate, thereby rotating the cylinder output shaft and achieving bidirectional stepless speed variation in output power. Traditionally, pumps and motors are designed and manufactured independently. During use, high-pressure oil pipes need to be connected between the pump and motor. The quality of the finished oil pipes and the quality of installation will affect the reliability of the product. Especially in use scenarios with extremely limited space, it is difficult to lay out independent oil pipes. Therefore, a combined pump and motor configuration solution with higher compactness and reliability is needed.

[0004] Given the above situation, developing a design scheme that is simple in configuration, compact in structure, and has good overall adaptability is a very urgent direction and goal that those skilled in the art need to strive to achieve. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] The technical problem this invention aims to solve is: how to provide a highly compact, semi-dry housing in-line integrated pump-motor. Traditional hydraulic pumps and motors generally employ a full-level housing design, which suffers from significant oil churning losses and is unsuitable for high-speed, heavy-load applications. Furthermore, under high and low temperature conditions and extreme speed and pressure conditions, the risk of oil leakage from the shaft end oil seal is extremely high, requiring an additional low-temperature unloading circuit to ensure safe operation. By integrating the pump and motor, the hydraulic circuit function and structure can be integrated into a unified design, fully utilizing the advantages of housing integration, increasing system reliability, and providing possibilities for innovative integrated pump-motor configurations.

[0007] (II) Technical Solution

[0008] To solve the above technical problems, the present invention provides a high-compact semi-dry housing inline pump motor, wherein the hydraulic circuit of the high-compact semi-dry housing inline pump motor includes: pump assembly (1), oil circuit assembly (2), high-pressure safety valve assembly (3), motor assembly (4), flushing and cooling valve assembly (5), and variable control mechanism assembly (6).

[0009] With the oil circuit assembly (2) as the center, the high-compact semi-dry housing inline pump motor is divided into two orthogonal axial directions. The pump assembly (1) and the motor assembly (4) are arranged to the left and right along the horizontal axis, and the flushing cooling valve assembly (5) and the high-pressure safety valve assembly (3) are arranged to the top and bottom along the vertical axis. The variable control mechanism assembly (6) is connected to the pump assembly (1) separately.

[0010] The oil circuit assembly (2) includes an oil circuit body and a replenishing check valve. The internal oil passages in the oil circuit body are connected to the other components in the integrated pump motor. The external replenishing oil is absorbed through the built-in replenishing channel in the motor housing to replenish the hydraulic circuit of the integrated pump motor, and the oil is discharged through the pump housing and the motor housing.

[0011] The high-pressure safety valve group (3) includes a high-pressure selection valve, a main valve, and a pilot relief valve. The main valve is connected to the internal oil passage of the oil circuit assembly (2). The high-pressure selection valve automatically selects the working high pressure, and the pilot relief valve limits the maximum working pressure. In addition, a first pressure measuring point M1, a second pressure measuring point M2, and a third pressure measuring point M3 are set to measure the pressure values ​​at various points of the high-pressure safety valve group (3). An oil outlet R3 is set to drain the leaked oil from the pilot relief valve.

[0012] The flushing cooling valve group (5) is connected to the internal oil passage of the oil circuit assembly (2) to discharge low-pressure high-temperature working oil. A flow control device is set at the outlet position to control the flushing flow rate in the housing. The discharged working oil is adaptively flushed into the pump housing and motor housing through the oil circuit assembly (2) to control the temperature rise of the system.

[0013] The pump assembly (1) includes an input shaft system, a pump rotor, and a pump housing. The internal oil passages of the pump rotor are connected to the internal oil passages of the oil circuit assembly (2). The input shaft system, pump rotor, and displacement control mechanism are integrated inside the pump housing. The pump housing is provided with an oil outlet R1 for guiding and discharging oil, ensuring that the liquid level in the housing is controllable. Several straight-through oil guide grooves are opened on the inner wall of the pump housing to discharge leaked oil and reduce oil churning losses.

[0014] The pump assembly (1) is connected to the engine and is in a rotating state for a long time. The working load and duration of the pump rotor are quite severe. Therefore, a long oil passage is opened inside the pump housing (1) to supply oil to the forced spray device of the pump rotor assembly, so as to achieve forced cooling and temperature reduction of the local overheated position of the rotor. On the other hand, it supplies oil to lubricate the pump rotor bearing to ensure that the rotor bearing is always fully lubricated.

[0015] The motor assembly (4) includes an output shaft system, a motor rotor, an oil supply channel, and a motor housing. The oil passages and oil supply channel contained in the motor rotor are connected to the oil circuit assembly (2). The output shaft system and the motor rotor are integrated inside the motor housing. The motor housing is provided with an oil outlet R2 for guiding and discharging oil, ensuring that the liquid level in the housing is controllable. Several oil guide grooves are opened on the inner wall of the motor housing for discharging the working oil in the housing, carrying away heat, and ensuring that the temperature rise of the motor rotor is controllable.

[0016] (III) Beneficial Effects

[0017] Compared with existing technologies, this invention adopts a semi-dry shell inline integrated pump motor configuration, which solves the extreme high-temperature heat dissipation and cooling problems and low-temperature reliability problems caused by the highly compact integrated design of the pump motor. By utilizing the high integration of the structure, the flushing supply and return oil structure design is cleverly arranged, eliminating the temperature rise control problem caused by the increased compactness, and improving the reliability and adaptability of the integrated pump motor system. Attached Figure Description

[0018] Figure 1 A hydraulic circuit schematic diagram of a highly compact dry-casing integrated pump-motor configuration scheme provided by the present invention;

[0019] Figure 2 This is a schematic diagram of the external structure of a highly compact dry-casing integrated pump motor provided by the present invention.

[0020] Figure 3 This is a schematic cross-sectional view of the pump motor housing structure provided by the present invention.

[0021] Figure 4 This is a schematic diagram of the design scheme of the pump assembly jet device provided by the present invention. Detailed Implementation

[0022] To make the objectives, contents, and advantages of the present invention clearer, the specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0023] To solve the above technical problems, the present invention provides a high-compact semi-dry housing inline pump motor, wherein the hydraulic circuit of the high-compact semi-dry housing inline pump motor includes: pump assembly (1), oil circuit assembly (2), high-pressure safety valve assembly (3), motor assembly (4), flushing and cooling valve assembly (5), and variable control mechanism assembly (6).

[0024] With the oil circuit assembly (2) as the center, the high-compact semi-dry housing inline pump motor is divided into two orthogonal axial directions. The pump assembly (1) and the motor assembly (4) are arranged to the left and right along the horizontal axis, and the flushing cooling valve assembly (5) and the high-pressure safety valve assembly (3) are arranged to the top and bottom along the vertical axis. The variable control mechanism assembly (6) is connected to the pump assembly (1) separately.

[0025] The oil circuit assembly (2) includes an oil circuit body and a replenishing check valve. The internal oil passages in the oil circuit body are connected to the other components in the integrated pump motor. The external replenishing oil is absorbed through the built-in replenishing channel in the motor housing to replenish the hydraulic circuit of the integrated pump motor, and the oil is discharged through the pump housing and the motor housing.

[0026] The high-pressure safety valve group (3) includes a high-pressure selection valve, a main valve, and a pilot relief valve. The main valve is connected to the internal oil passage of the oil circuit assembly (2). The high-pressure selection valve automatically selects the working high pressure, and the pilot relief valve limits the maximum working pressure. In addition, a first pressure measuring point M1, a second pressure measuring point M2, and a third pressure measuring point M3 are set to measure the pressure values ​​at various points of the high-pressure safety valve group (3). An oil outlet R3 is set to drain the leaked oil from the pilot relief valve.

[0027] The flushing cooling valve group (5) is connected to the internal oil passage of the oil circuit assembly (2) to discharge low-pressure high-temperature working oil. A flow control device is set at the outlet position to control the flushing flow rate in the housing. The discharged working oil is adaptively flushed into the pump housing and motor housing through the oil circuit assembly (2) to control the temperature rise of the system.

[0028] The pump assembly (1) includes an input shaft system, a pump rotor, and a pump housing. The internal oil passages of the pump rotor are connected to the internal oil passages of the oil circuit assembly (2). The input shaft system, pump rotor, and displacement control mechanism are integrated inside the pump housing. The pump housing is provided with an oil outlet R1 for guiding and discharging oil, ensuring that the liquid level in the housing is controllable. Several straight-through oil guide grooves are opened on the inner wall of the pump housing to discharge leaked oil and reduce oil churning losses.

[0029] The pump assembly (1) is connected to the engine and is in a rotating state for a long time. The working load and duration of the pump rotor are quite severe. Therefore, a long oil passage is opened inside the pump housing (1) to supply oil to the forced spray device of the pump rotor assembly, so as to achieve forced cooling and temperature reduction of the local overheated position of the rotor. On the other hand, it supplies oil to lubricate the pump rotor bearing to ensure that the rotor bearing is always fully lubricated.

[0030] The motor assembly (4) includes an output shaft system, a motor rotor, an oil supply channel, and a motor housing. The oil passages and oil supply channel contained in the motor rotor are connected to the oil circuit assembly (2). The output shaft system and the motor rotor are integrated inside the motor housing. The motor housing is provided with an oil outlet R2 for guiding and discharging oil, ensuring that the liquid level in the housing is controllable. Several oil guide grooves are opened on the inner wall of the motor housing for discharging the working oil in the housing, carrying away heat, and ensuring that the temperature rise of the motor rotor is controllable.

[0031] Example 1

[0032] like Figure 1 As shown, the hydraulic circuit provided by the present invention is divided into two orthogonal axial directions with the oil circuit assembly (2) as the center. The pump assembly (1) and the motor assembly (2) are arranged along the horizontal axis, and the high-pressure safety valve assembly (3) and the flushing and cooling valve assembly (4) are arranged along the vertical axis. The variable control mechanism assembly (6) is connected to the pump assembly (1). The oil circuit assembly consists of an oil circuit body and a replenishment control valve. The internal oil passages contained in the oil circuit body are connected to the other components. External replenishment oil is absorbed through the replenishment channel of the motor housing, and the oil is discharged through the pump housing and the motor housing. The high-pressure safety valve assembly (3) is connected to the internal oil passages contained in the oil circuit body of the oil circuit assembly (2). The working high pressure is automatically selected by the selector valve, and the maximum working pressure is limited by the pilot relief valve. In addition, pressure measuring points M1, M2, and M3 are set to measure the pressure values ​​at each point, and an oil outlet R3 is set to drain the leaked oil from the pilot relief valve. The flushing cooling valve assembly (5) and the oil circuit assembly (2) contain working oil passages to discharge low-pressure working oil. The outlet is equipped with a throttling structure to control the flushing flow rate inside the housing. The discharged flushing oil is automatically flushed into the pump housing and motor housing through the oil circuit assembly (2).

[0033] like Figure 2As shown in the schematic diagram of the external structure provided by this invention, the motor housing assembly, oil circuit assembly, and pump housing assembly are sequentially fastened together by multiple long bolts or screws along the horizontal axis of the oil circuit assembly. The motor housing is in the shape of a columnar, cubic, or a combination of both. The example in the figure is a columnar shape with multiple grooves on the outside for accommodating the long bolts. These additional grooves are mainly designed to reduce the external dimensions of the integrated pump motor, thereby improving the structural compactness. If there are no strict requirements on the external dimensions, additional grooves may not be required. An oil filler port G is provided on the top of the motor housing for replenishing the integrated pump motor with working oil. The replenishment pressure is usually between 1.5 and 2.5 MPa. An oil outlet R2 is provided on the outer end face of the motor housing. The number of R2s is not limited and is customized according to the operating conditions of the integrated pump motor. Generally, the larger the displacement, the larger the flow area of ​​the oil outlet. Two oil outlets are shown in the figure. The pump housing is cylindrical, cubic, or a combination of both. The example shown is an irregular shape formed by the intersection of a cylindrical and a cubic form. Variable displacement control mechanism mounting interfaces are located on both sides of the cylindrical body, allowing for the fixed installation of the variable displacement control mechanism that drives the pump swashplate angle. The top of the pump housing has a jet flushing device interface and necessary internal oil passage plugs. An oil outlet R1 is provided on the outer end face of the pump housing. The number and form of R1 are not limited, similar to the oil outlet on the end face of a motor housing, and are customized according to the operating conditions of the integrated pump motor. Generally, the larger the displacement, the larger the flow area of ​​the oil outlet. The upper side of the oil circuit assembly's longitudinal axis connects to the high-pressure safety valve assembly, and the lower side connects to the flushing and cooling valve assembly. The high-pressure safety valve assembly contains three functions: a high-pressure selector valve, a main valve, and a pilot relief valve. The plate valve scheme shown in the figure is only an example; a cartridge valve assembly can be used instead, or a combination of plate and cartridge valves can be used. The flushing cooling valve assembly discharges the low-pressure, high-temperature working oil in the circuit and flushes it into the pump housing and motor housing. Through the flushing flow, the heat generated by the pump rotor and motor rotor is carried away to control the temperature rise of the system.

[0034] like Figure 3As shown, the pump and motor housing assembly solution provided by this invention includes a motor housing with an oil supply channel that communicates with the oil circuit assembly. Multiple oil guide grooves are formed on the inner wall of the motor housing, connected to the housing's drain port, for discharging the working oil inside the housing, removing heat, and ensuring controllable temperature rise of the motor rotor. Several straight-through oil guide grooves are formed on the inner wall of the pump housing to discharge leaking oil and reduce churning losses. The flushing and cooling valve assembly communicates with the internal oil passages contained in the oil circuit assembly, discharging low-pressure working oil. A throttling structure is provided at the outlet; the example in the figure shows the simplest throttling orifice. By adjusting the orifice diameter, the flushing flow rate inside the housing can be controlled. The discharged flushing oil is adaptively distributed by the oil circuit assembly into the pump and motor housings, flows through the oil guide grooves in the pump and motor housings, and is discharged from the outlet. When the pump displacement is zero, the flushing flow rate is zero, and only the leaking oil from the pump rotor and motor rotor is discharged through the outlet in the pump and motor housings respectively. The liquid level inside the housing is very low, considered a dry state. When the pump displacement is non-zero, the motor operates, the flushing flow increases, and the fluid is adaptively distributed into the pump housing and motor housing. The leaking oil from the mixing pump rotor and motor rotor is discharged through the oil outlet. Due to the limited area of ​​the oil outlet, the liquid level inside the housing is high, which is considered to be in a wetted state. The discharged oil carries away the extra heat generated during the pump and motor drive process, thereby controlling the temperature rise of the system. Moreover, the higher the temperature, the lower the oil viscosity, the greater the flushing flow and leakage flow, while the oil heat capacity changes relatively little. Therefore, the more heat is carried away by the oil, which can ensure that the system can work stably within a wide temperature range.

[0035] like Figure 4 As shown, the jet flushing device solution provided by this invention includes a number of jet flushing devices arranged inside the pump housing, which, in conjunction with the flushing valve, constitute a cooling and heat dissipation system for a high-compact dry-casing integrated pump motor. The jet flushing device utilizes replenished oil to perform directional jet flushing on the high-heat-generating parts of the pump rotor, preventing the pump rotor from burning and being damaged under extreme temperature conditions due to localized overheating. The jet flushing device consists of a throttle valve body, a sealing ring, a plug, and screws. The throttle valve body and screws form a positioning and fastening structure. The throttle valve body draws oil from the long oil passage of the pump housing and uses a throttle orifice to converge the oil, achieving jet spraying. The kinetic energy of the oil can accurately flush the target location (usually a friction pair without independent lubrication and cooling). The sealing ring is used to seal oil leaking from the gap between the throttle valve body and the cylindrical wall of the pump housing. The plug is a process part designed to facilitate the machining of the throttle valve body.

[0036] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A highly compact semi-dry casing in-line pump motor, characterized in that, The hydraulic circuit of the high-compact semi-dry housing inline pump motor includes: pump assembly (1), oil circuit assembly (2), high-pressure safety valve assembly (3), motor assembly (4), flushing and cooling valve assembly (5), and variable control mechanism assembly (6). With the oil circuit assembly (2) as the center, the high-compact semi-dry housing inline pump motor is divided into two orthogonal axial directions. The pump assembly (1) and the motor assembly (4) are arranged to the left and right along the horizontal axis, and the flushing cooling valve assembly (5) and the high-pressure safety valve assembly (3) are arranged to the top and bottom along the vertical axis. The variable control mechanism assembly (6) is connected to the pump assembly (1) separately.

2. The high-compact semi-dry housing inline pump motor as described in claim 1, characterized in that, The oil circuit assembly (2) includes an oil circuit body and a replenishing check valve. The internal oil passages in the oil circuit body are connected to the other components in the integrated pump motor. The external replenishing oil is absorbed through the built-in replenishing channel in the motor housing to replenish the hydraulic circuit of the integrated pump motor, and the oil is discharged through the pump housing and the motor housing.

3. The high-compact semi-dry housing inline pump motor as described in claim 2, characterized in that, The high-pressure safety valve assembly (3) includes a high-pressure selector valve, a main valve, and a pilot relief valve. The main valve is connected to the internal oil passage of the oil circuit assembly (2). The high-pressure selector valve automatically selects the working high pressure, and the pilot relief valve limits the maximum working pressure. In addition, a first pressure measuring point M1, a second pressure measuring point M2, and a third pressure measuring point M3 are set to measure the pressure values ​​at various points of the high-pressure safety valve assembly (3). An oil outlet R3 is set to drain the leaked oil from the pilot relief valve.

4. The high-compact semi-dry housing inline pump motor as described in claim 3, characterized in that, The flushing cooling valve assembly (5) is connected to the internal oil passage of the oil circuit assembly (2) to discharge low-pressure high-temperature working oil. A flow control device is set at the outlet position to control the flushing flow rate in the housing. The discharged working oil is adaptively flushed into the pump housing and motor housing through the oil circuit assembly (2) to control the temperature rise of the system.

5. The high-compact semi-dry housing inline pump motor as described in claim 4, characterized in that, The pump assembly (1) includes an input shaft system, a pump rotor and a pump housing. The internal oil passage contained in the pump rotor is connected to the internal oil passage of the oil circuit assembly (2). The input shaft system, the pump rotor and the displacement control mechanism are integrated inside the pump housing. The pump housing is provided with an oil outlet R1 for guiding and discharging oil to ensure that the liquid level in the housing is controllable.

6. The high-compact semi-dry housing inline pump motor as described in claim 5, characterized in that, The pump housing has several straight-through oil guide grooves on its inner wall to drain leaking oil and reduce oil churning losses.

7. The high-compact semi-dry housing inline pump motor as described in claim 6, characterized in that, The pump assembly (1) is connected to the engine and is in a rotating state for a long time. The working load and duration of the pump rotor are quite severe. Therefore, a long oil passage is opened inside the pump housing. On the one hand, it supplies oil to the forced spray device of the pump rotor assembly to achieve forced cooling and temperature reduction of the local overheated parts of the rotor. On the other hand, it supplies oil to lubricate the pump rotor bearing to ensure that the rotor bearing is always fully lubricated.

8. The high-compact semi-dry housing inline pump motor as described in claim 5, characterized in that, The motor assembly (4) includes: an output shaft system, a motor rotor, an oil replenishment channel, and a motor housing; the oil passage and oil replenishment channel contained in the motor rotor are connected to the oil circuit assembly (2), the output shaft system and the motor rotor are integrated inside the motor housing, and the motor housing is provided with an oil outlet R2 for guiding and discharging oil to ensure that the liquid level in the housing is controllable.

9. The high-compact semi-dry housing in-line pump motor as described in claim 8, characterized in that, Several oil guide grooves are opened on the inner wall of the motor housing to drain the working oil inside the housing, remove heat, and ensure that the temperature rise of the motor rotor is controllable.

10. The high-compact semi-dry housing in-line pump motor as described in claim 9, characterized in that, The integrated pump motor adopts a semi-dry housing inline integrated pump motor configuration, which solves the extreme high temperature heat dissipation and cooling problems and low temperature reliability problems brought about by the high compactness integrated design of the pump motor. Utilizing the high integration of the structure, the flushing supply and return oil structure design is cleverly arranged, eliminating the temperature rise control problem caused by the increased compactness, and improving the reliability and adaptability of the integrated pump motor system.

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