An integrated external pressure regulating valve and compensated lubrication transmission hydraulic system

Abstract

An integrated external pressure regulating valve and compensated lubrication transmission hydraulic system includes a housing. A pressure regulating valve is connected to the outside of the housing, and a transmission pump is connected to the inside of the housing. The transmission pump includes a pump shaft seat and a pump body. A torque converter is connected to the transmission pump via an input shaft, and the spline of the torque converter is inserted into the transmission pump. Several oil passages are provided on the end faces of the connection between the housing and the pump shaft seat. These oil passages communicate with the pressure regulating valve body, the torque converter, and the radiator, providing the system with cooling hydraulic oil and power hydraulic oil. This integrated external pressure regulating valve and compensated lubrication transmission hydraulic system uses an integrated external cartridge system pressure regulating valve, which has a simple structure, stable system pressure control performance, convenient maintenance, and cost savings. Simultaneously, it employs a lubrication oil compensation design method, adding a portion of hydraulic oil to the radiator in addition to the portion of oil from the torque converter, effectively meeting the lubrication and cooling requirements inside the transmission.

Description

Technical Field

[0001] This invention relates to the field of gearbox technology, specifically to a gearbox hydraulic system with an integrated external pressure regulating valve and compensating lubrication. Background Technology

[0002] The hydraulic system is a crucial component of the automatic transmission in excavators and loaders, playing a vital role in power generation, lubrication, and heat dissipation, thus affecting the transmission's performance, reliability, and lifespan. Currently, the hydraulic process in excavator and loader transmissions is as follows: Oil in the oil pan is transmitted via the transmission pump. After passing through a filter, one path leads to the control valve, which then supplies power to the transmission gearbox and steering assembly. Another path overflows to the torque converter for gear and torque conversion. Within the torque converter, some oil flows internally, while the rest is cooled by the radiator. The cooled oil then enters the transmission to lubricate key components in the clutch assembly (bearings, friction plates, etc.), simultaneously carrying away heat for cooling. Insufficient lubrication often leads to problems such as burnt-out clutches and excessive transmission oil temperature, severely impacting the transmission's quality and reliability. Furthermore, the hydraulic oil entering the control valve often uses an internal valve to regulate system pressure. This valve orifice is located inside the housing, requiring high machining precision and incurring high costs. Adjusting system pressure also necessitates disassembling the housing, making troubleshooting inconvenient, difficult, inefficient, and costly. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a gearbox hydraulic system with a simple structure, good performance, and an integrated external pressure regulating valve and compensating lubrication.

[0004] This invention is achieved through the following technical solution: an integrated external pressure regulating valve and compensated lubrication transmission hydraulic system, comprising a housing, a pressure regulating valve connected to the outside of the housing, and a transmission pump connected to the inside of the housing. The transmission pump includes a pump shaft seat and a pump body, with an annular space BB formed between the pump shaft seat and the input shaft. The transmission pump is connected to a torque converter via the input shaft, and the spline of the torque converter is inserted into the transmission pump. The outside of the pump shaft seat and the torque converter form an annular space AA.

[0005] The end face at the connection between the housing and the pump shaft seat is provided with several oil passages. The oil passages are connected to the pressure regulating valve body, torque converter and radiator. The oil passages provide the system with cooling hydraulic oil and power hydraulic oil.

[0006] The oil passage for supplying cooling hydraulic oil is connected in sequence to the outlet of the speed pump, the inlet of the pressure regulating valve on the housing, the pressure regulating valve, the outlet of the pressure regulating valve on the housing, the pump shaft seat, the housing, and the radiator.

[0007] The oil passage supplying the power hydraulic oil is connected in sequence to the outlet of the speed pump, the housing, the pressure regulating valve, the annular space BB, and the torque converter;

[0008] The annular space AA connects to the annular space BB and the oil passage connecting the pump shaft seat and the radiator. The power hydraulic oil flows into the radiator after passing through the torque converter.

[0009] Furthermore, the pressure regulating valve includes a valve body, a valve core, a spring, and a retaining ring. The valve body and valve core have a semi-hollow central hole inside. The valve core is disposed inside the valve body, the retaining ring is disposed at the lower end inside the valve body, and the spring is disposed in the space formed by the valve body and the valve core. The pressure regulating valve is connected to the housing by threads, and an ED sealing ring is provided between the valve body and the housing.

[0010] The lower part of the valve body is provided with a groove, and O-ring I and O-ring II are provided at both ends of the groove. Several through holes are provided at the groove. The lower part of the valve core is also provided with several through holes. The thread on the valve body is located above the groove. The O-ring I is located at the upper part of the groove. A side through hole c is provided on the valve body between the thread and the O-ring I. The pressure regulating valve core is provided with a side through hole b that cooperates with the side through hole c.

[0011] The valve core of the pressure regulating valve has a shim inside the hollow center hole for adjusting the compression length of the spring.

[0012] The pump shaft seat has holes d, e, f, g, h and p on its end face. Holes d and e are connected through the central hole of the pump shaft seat. Hole g is perpendicular to and passes through hole d. Hole f is perpendicular to and passes through hole h. The annular hole i is an annular hole formed by the joint surface of the pump shaft seat and the pump body. The annular hole i is connected to holes g and f. Hole p is the hydraulic oil outlet of the variable speed pump.

[0013] The hole d is a stepped hole that partially penetrates the pump shaft seat from the side, with a large hole on the outside and a small hole on the inside; the hole e is a straight hole on the side; the hole h is a stepped hole and a blind hole on the side.

[0014] The hole h has a built-in torque converter inlet oil pressure valve.

[0015] The housing is provided with holes n, j, m, k, q and r. Hole n is the mounting hole for the variable speed pump. Hole j is connected to the pressure regulating valve. Hole j is connected to hole k. Hole k is through hole n. Hole m is through hole n. Hole m is externally connected to the radiator. Hole q is connected to the oil outlet of the variable speed pump.

[0016] The orifice r is a stepped orifice, and the pressure regulating valve is placed inside the orifice r.

[0017] The present invention has the following advantages: The integrated external pressure regulating valve and the compensated lubrication transmission hydraulic system of the present invention adopt an integrated external cartridge system pressure regulating valve, which has a simple structure, stable pressure regulation performance, convenient maintenance, and cost savings; at the same time, it adopts a lubricating oil compensation design method, which, in addition to the oil from the torque converter going to the radiator, adds a portion of hydraulic oil to the radiator, in order to effectively meet the lubrication and heat dissipation requirements inside the transmission. Attached Figure Description

[0018] The accompanying drawings, as part of this invention, are provided to further illustrate the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation thereof. Clearly, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0019] In the attached diagram:

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the internal connections of the present invention;

[0022] Figure 3 This is a connection diagram of the pressure regulating valve of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure at the connection between the housing and the pump shaft seat of the present invention;

[0024] Figure 5 This is a schematic diagram of the structure of the variable speed pump.

[0025] Figure 6 yes Figure 5 A sectional view along the CC direction;

[0026] Figure 7 This is a schematic diagram of the structure of the pressure regulating valve body of the present invention.

[0027] In the diagram: 1. Valve body, 2. ED sealing ring, 3. Valve core, 4. Spring, 5. O-ring I, 6. Retaining ring, 7. O-ring II, 8. Torque converter inlet oil pressure valve, 9. Pump shaft seat, 10. Pump body, 11. Variable speed pump, 12. Torque converter, 13. Housing, 14. Input shaft.

[0028] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0030] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0031] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0032] like Figures 1 to 7The diagram illustrates an integrated external pressure regulating valve and compensated lubrication transmission hydraulic system, comprising a housing 13. A pressure regulating valve is connected to the outer side of the housing 13, and a transmission pump 11 is connected to the inner side of the housing 13. The transmission pump 11 includes a pump shaft seat 9 and a pump body 10, with an annular space BB formed between the pump shaft seat 9 and an input shaft 14. The transmission pump 11 is connected to a torque converter 12 via the input shaft 14, with the spline of the torque converter 12 inserted into the transmission pump 11. The outer side of the pump shaft seat 9 and the torque converter 12 form an annular space AA. Several oil passages are provided on the end faces of the connection between the housing 13 and the pump shaft seat 9, and these oil passages are connected to... The pressure regulating valve body 1, torque converter 12, and radiator are connected. The oil passage provides cooling hydraulic oil and power hydraulic oil to the system. The oil passage for providing cooling hydraulic oil is connected in sequence to the oil outlet of the speed pump 11, the oil inlet of the pressure regulating valve on the housing 13, the pressure regulating valve, the oil outlet of the pressure regulating valve on the housing 13, the pump shaft seat 9, the housing 13, and the radiator. The oil passage for providing power hydraulic oil is connected in sequence to the oil outlet of the speed pump 11, the housing 13, the pressure regulating valve, the annular space BB, and the torque converter 12. The annular space AA is connected to the annular space BB and the oil passage connecting the pump shaft seat 9 and the radiator. After passing through the torque converter 12, part of the power hydraulic oil flows into the radiator. The present invention relates to an integrated external pressure regulating valve and a compensated lubrication transmission hydraulic system, comprising a pressure regulating valve, a housing, an input shaft, a transmission pump, a torque converter, and a radiator. The pressure regulating valve is externally mounted on the housing, the control valve is bolted to the housing, the transmission pump is bolted to the housing, the torque converter is splined and inserted into the transmission pump, forming an annular space AA with the transmission pump, the torque converter is splined to the input shaft, and the input shaft and transmission pump form an annular space BB. The torque converter radiator is connected to the housing via a hose. The external pressure regulating valve facilitates subsequent maintenance, simplifies the complexity of the work, and saves costs. Simultaneously, a lubrication oil compensation design method is adopted, with an additional portion of hydraulic oil going to the radiator in addition to the portion of oil from the torque converter, to effectively meet the lubrication and heat dissipation requirements of the transmission.

[0033] like Figure 7The diagram illustrates an integrated external pressure regulating valve and a compensated lubrication transmission hydraulic system. The pressure regulating valve includes a valve body 1, a valve core 3, a spring 4, and a retaining ring 6. The valve body 1 and valve core 3 have semi-hollow central holes. The valve core 3 is disposed within the valve body 1, and the retaining ring 6 is disposed at the lower end of the valve body 1. The spring 4 is disposed within the space formed by the valve body 1 and valve core 3. The pressure regulating valve is threaded to a housing 13, and an ED sealing ring 2 is provided between the valve body 1 and the housing 13. A shim for adjusting the spring compression length is provided within the semi-hollow central hole of the valve core 3. One end of the pressure regulating valve body is sealed to the housing via the ED sealing ring and fixed to the housing via external threads. The spring is installed in the space corresponding to the semi-through central hole of the pressure regulating valve body and the semi-through central hole of the valve core. The valve core is located within the semi-through central hole of the pressure regulating valve body with a gap of 0.015-0.025 mm and is axially positioned by the retaining ring fixed to the pressure regulating valve body. If the transmission system pressure is too low after prolonged use, it can be increased by adding a shim inside the valve core semi-through hole and adjusting the spring compression length, making service and maintenance easier.

[0034] like Figure 7 The diagram illustrates an integrated external pressure regulating valve and a compensated lubrication transmission hydraulic system. The valve body 1 has a groove at its lower part, with O-rings I 5 and II 7 at both ends. Several through holes are located at the groove's exit. The valve core 3 also has several through holes at its lower part. A thread on the valve body 1 is located above the groove, and O-ring I 5 is located at the top of the groove. A side through hole c is located on the valve body 1 between the thread and O-ring I 5. The pressure regulating valve core has a side through hole b that mates with the side through hole c. In this invention, O-rings I and II are assembled within the external groove of the pressure regulating valve body. There are N through holes a between the two grooves, and one side through hole c between O-ring I and the thread. The pressure regulating valve core has one side through hole b. While the semi-through center hole of the valve body requires high machining precision, the overall size is relatively small compared to the transmission housing, resulting in low machining costs and easy maintenance and replacement, leading to a high cost-performance ratio.

[0035] like Figures 5 to 6 The diagram illustrates an integrated external pressure regulating valve and a compensated lubrication transmission hydraulic system. The pump shaft seat 9 has holes d, e, f, g, h, and p on its end face. Holes d and e are connected through the central hole of the pump shaft seat. Hole g is perpendicular to hole d, and hole f is perpendicular to hole h. An annular hole i is formed by the mating surfaces of the pump shaft seat 9 and the pump body 10, and it is connected to holes g and f. Hole p is the hydraulic oil outlet for the transmission pump. Hole d is a stepped hole that partially penetrates the pump shaft seat 9 from the side, with a larger outer hole and a smaller inner hole. Hole e is a side-through hole. Hole h is a stepped hole and a side blind hole. A torque converter inlet oil pressure valve 8 is built into hole h. The annular space AA is connected to annular hole i, and the annular space BB is connected to hole e.

[0036] like Figures 3 to 4 The diagram illustrates an integrated external pressure regulating valve and compensated lubrication transmission hydraulic system. The housing has holes n, j, m, k, q, and r. Hole n is the mounting hole for the transmission pump. Hole j connects to the pressure regulating valve and is connected to hole k. Hole k passes through hole n. Hole m passes through hole n and is externally connected to the radiator. Hole q connects to the transmission pump's oil outlet, i.e., hole q connects to the transmission pump's port p. Hole r is a stepped hole, and the pressure regulating valve is placed inside hole r. The two O-ring seals of the pressure regulating valve are located on either side of hole j. Hole r0 connects to hole r, and the other end of hole r0 penetrates the housing.

[0037] When the gearbox of this invention is working, hydraulic oil flows from the outlet p of the transmission pump to the oil hole q in the housing, gradually pushing the pressure regulating valve core to compress the spring. As the pressure regulating valve core moves to the valve body through hole a, which is fully open, the overflow oil is sealed by the two O-rings on the left and right sides of the pressure regulating valve and flows through the valve body through hole a to hole j, keeping the system pressure stable. At the same time, the gas inside the valve core is discharged into the housing through the hole b on the valve core 3, the valve body hole c, and the housing hole r0, preventing the internal air pressure of the valve core from hindering the movement of the valve core and keeping the system pressure high. The overflow oil flows from the housing hole j to the hole k and enters the transmission pump hole d. A portion of the oil enters the hole e through a small hole near the center of the hole d, and then enters the radiator after passing through the housing hole m. The remaining portion of the oil enters the hole g through the hole d, enters the hole f through the annular hole i of the transmission pump, and then enters the annular space AA after being regulated by the torque converter oil inlet pressure regulating valve in the hole h. At this point, the oil is divided into two parts. One part remains inside the torque converter for torque conversion, while the remaining oil enters the annular space BB, passes through the transmission pump hole e, and then through the housing hole m before entering the radiator. The oil in the radiator, after being cooled, enters the transmission for lubrication of critical internal components and overall transmission cooling.

[0038] The present invention discloses an integrated external pressure regulating valve and a compensated lubrication transmission hydraulic system. The integrated external cartridge system pressure regulating valve has a simple structure, is easy to maintain, and saves costs. At the same time, it adopts a lubrication oil compensation design method, which, in addition to the oil from the torque converter going to the radiator, adds a portion of hydraulic oil to the radiator, effectively meeting the lubrication and heat dissipation requirements inside the transmission.

[0039] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0040] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features found in other embodiments but not others, combinations of features from different embodiments are also within the scope of protection of this invention and form different embodiments. For example, in the embodiments described above, those skilled in the art can use them in combination based on known technical solutions and the technical problems to be solved by this application.

[0041] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A unitized external pressure compensating valve, lubricated gearbox hydraulic system, characterized by: The shell (13) is connected with a constant pressure valve outside, and a variable speed pump (11) is connected inside, the variable speed pump (11) comprises a pump shaft seat (9) and a pump body (10), and an annular space BB is formed between the pump shaft seat (9) and an input shaft (14); the variable speed pump (11) is connected with a torque converter (12) through the input shaft (14), the spline of the torque converter (12) is inserted in the variable speed pump (11), and the pump shaft seat (9) is connected with the torque converter (12) to form an annular space AA outside; End faces of the shell (13) and the pump shaft seat (9) are provided with a plurality of oil channels, the oil channels are communicated with the constant pressure valve body (1), the torque converter (12) and a radiator, and the oil channels provide heat dissipation hydraulic oil and power hydraulic oil for a system; The oil channel for providing the heat dissipation hydraulic oil is connected with the variable speed pump (11) outlet, an oil inlet end of the constant pressure valve on the shell (13), the constant pressure valve, an oil outlet end of the constant pressure valve on the shell (13), the pump shaft seat (9), the shell (13) and the radiator in sequence; The oil channel for providing the power hydraulic oil is connected with the variable speed pump (11) outlet, the shell (13), the constant pressure valve, the annular space BB and the torque converter (12) in sequence; The annular space AA is communicated with the annular space BB and the oil channel communicated with the radiator, and the power hydraulic oil flows into the radiator after passing through the torque converter (12); The shell is provided with holes n, j, m, k, q and r, the hole n is a variable speed pump mounting hole, the hole j is communicated with the constant pressure valve, the hole j is communicated with the hole k, the hole k is penetrated through the hole n, the hole m is penetrated through the hole n, the hole m is connected with the radiator outside, and the hole q is communicated with the variable speed pump outlet; The hole r is a stepped hole, and the constant pressure valve is arranged in the hole r.

2. A unitized external pressure maintaining valve, compensated lubrication type transmission hydraulic system according to claim 1, characterized in that: The constant pressure valve comprises a valve body (1), a valve core (3), a spring (4) and a check ring (6), the valve body (1) and the valve core (3) are internally provided with a half-empty center hole, the valve core (3) is arranged in the valve body (1), the check ring (6) is arranged at the lower end of the valve body (1) inside, and the spring (4) is arranged in the space formed by the valve body (1) and the valve core (3); the constant pressure valve is connected with the shell (13) through threads, and an ED sealing ring (2) is arranged between the valve body (1) and the shell (13).

3. A unitized external pressure maintaining valve, compensated lubrication gearbox hydraulic system as claimed in claim 2, characterized in that: The lower part of the valve body (1) is provided with a groove, both ends of the groove are provided with O-rings I (5) and II (7), a plurality of through holes are arranged on the groove, and the lower part of the valve core (3) is also provided with a plurality of through holes; the threads on the valve body (1) are located above the groove, the O-ring I (5) is located on the upper part of the groove, a side through hole c is arranged on the valve body (1) between the threads and the O-ring I (5), and a side through hole b is arranged on the valve core of the constant pressure valve and matched with the side through hole c.

4. A unitized external pressure maintaining valve, compensated lubrication type transmission hydraulic system according to claim 2, characterized in that: A gasket for adjusting the compression length of the spring is arranged in the half-empty center hole of the valve core (3) of the constant pressure valve.

5. A unitized external pressure maintaining valve, compensated lubrication gearbox hydraulic system as claimed in claim 1, characterized in that: The end surface of the pump shaft seat (9) is provided with holes d, e, f, g, h and p, the holes d and e are communicated through the pump shaft seat center hole, the hole g vertically penetrates the hole d, the hole f vertically penetrates the hole h, the annular hole i is an annular hole formed by the joint surface of the pump shaft seat (9) and the pump body (10), the annular hole i is communicated with the holes g and f, and the hole p is a hydraulic oil outlet of the variable speed pump.

6. A unitized external pressure maintaining valve, compensated lubrication gearbox hydraulic system as claimed in claim 5, characterized in that: The hole d is a stepped hole, which is half-penetrated from the side of the pump shaft seat (9), the outer side is a large hole, and the inner side is a small hole; the hole e is a half-through hole; and the hole h is a stepped hole, which is a side blind hole.

7. A unitized external pressure maintaining valve, compensated lubrication gearbox hydraulic system as claimed in claim 5, characterized in that: The hole h is internally provided with a torque converter inlet oil pressure valve (8).

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