A gearbox with separate layout of lubricating oil channel and pressure oil channel

Abstract

The invention discloses a gearbox with a lubricating oil passage and a pressure oil passage arranged separately, comprising a housing assembly, a control valve assembly and a clutch assembly, wherein the housing assembly comprises a main housing, a sub-housing and a torque converter housing, the control valve assembly is installed on the main housing, the clutch assembly is installed between the main housing and the sub-housing, the main housing is processed with a first pressure oil passage and a pressure oil hole, the control valve assembly is provided with a control valve for controlling the on-off between the first pressure oil passage and the pressure oil hole, the pressure oil enters the clutch assembly through the first pressure oil passage and the pressure oil hole in turn, and the first lubricating oil passage formed by the sub-housing and the torque converter housing is connected to the second lubricating oil passage of the clutch shaft of the clutch assembly. The invention has a compact structure, is convenient for spatial arrangement of the whole machine, simplifies the complex oil circuit on the housing, improves the manufacturability, processing efficiency and maintainability of the gearbox, reduces the failure rate, and can meet the oil supply demand of the multi-gear clutch of the gearbox.

Description

Technical Field

[0001] The invention relates to a gearbox, in particular to a gearbox with a lubricating oil passage and a pressure oil passage arranged separately, belonging to the technical field of transmission devices. Background Art

[0002] As one of the important transmission components of engineering machinery, the oil circuit layout of the gearbox greatly affects the appearance structure and reliability of the gearbox, thereby affecting the spatial layout and working performance of the whole machine. The oil circuit of the gearbox can be divided into lubrication oil circuit and pressure oil circuit according to its purpose, which respectively play the role of heat dissipation and lubrication, improving life and ensuring the normal engagement and shifting of the clutch. In the existing gearbox oil circuit layout technology that requires forced lubrication, the gearbox oil circuit layout is generally divided into two types. One is to open corresponding oil channel holes on the box body and the corresponding clutch shaft, and the other is to lay the oil pipeline through the connection of joints and pipes. Both of these oil supply methods can play the role of delivering lubricating oil and pressure oil to the corresponding working position, but both have certain disadvantages. The former is limited by the straight hole processing technology of the oil channel hole, and the oil circuit layout is relatively simple, which cannot meet the needs of the current multi-speed gearbox; the latter lays the oil pipe to increase the outer dimensions of the gearbox, while increasing the complexity of the oil circuit layout and the probability of failure.

[0003] At present, most gearbox oil circuit layouts are arranged in such a way that several lubricating oil channels and pressure oil channels are arranged on one side of the box, and the opening and closing of the pressure oil channels are controlled by solenoid valves separately inserted in the pressure oil channels of the box (the number of solenoid valves is the same as the number of pressure oil channels), such as the technical solution disclosed in the Chinese patent application number 202022003752.7. Although this arrangement can realize the functions of transporting lubricating oil and controlling the pressure oil of each gear, it has the following disadvantages:

[0004] 1. The oil circuits are closely arranged on the box, which increases the difficulty of machining and casting the box;

[0005] 2. If a single oil circuit has a problem, the entire box needs to be disassembled and replaced, which increases the difficulty and cost of maintenance;

[0006] 3. The solenoid valve is inserted into the cast iron part of the box, and its accuracy and reliability are difficult to guarantee, which shortens the normal working life of the solenoid valve. Summary of the invention

[0007] In view of the above-mentioned defects of the prior art, the present invention provides a gearbox with a lubricating oil channel and a pressure oil channel arranged separately, aiming to improve the manufacturability, processing efficiency and maintainability of the gearbox and reduce the failure rate.

[0008] The technical solution of the present invention is as follows: a gearbox with a lubricating oil passage and a pressure oil passage arranged separately, comprising a housing assembly, a control valve assembly and a clutch assembly, wherein the housing assembly comprises a main housing, a sub-housing and a torque converter housing, the control valve assembly is installed on the main housing, the clutch assembly is installed between the main housing and the sub-housing, the main housing is processed with a first pressure oil passage and a pressure oil hole, the control valve assembly is provided with a controlled valve for controlling the on-off between the first pressure oil passage and the pressure oil hole, the pressure oil enters the clutch assembly through the first pressure oil passage and the pressure oil hole in turn, and the first lubricating oil passage formed by the sub-housing and the torque converter housing is connected to the second lubricating oil passage of the clutch shaft of the clutch assembly.

[0009] Furthermore, the main housing is provided with a plurality of pressure measuring ports, which are connected to the first pressure oil channel. The pressure measuring ports are used to detect the system oil pressure and the oil pressure of each gear position, thereby improving the reliability of the gearbox operation, the convenience of troubleshooting and the pertinence of maintenance.

[0010] Furthermore, the control valve assembly is an integrated valve block structure, a second pressure oil passage is cast on the valve body of the integrated valve block, the second pressure oil passage is used to connect the first pressure oil passage and the pressure oil hole, and the control valve is used to control the on and off of the second pressure oil passage. The oil circuit on the gearbox housing assembly is further simplified, and the multi-gear control of the gearbox is more convenient.

[0011] Furthermore, lubricating oil grooves are respectively provided on the surface of the auxiliary housing and the surface of the torque converter housing, and the lubricating oil grooves are combined to form the first lubricating oil channel, and the lubricating oil hole for connecting to the second lubricating oil channel is arranged in the lubricating oil groove of the auxiliary housing.

[0012] Furthermore, the inlet of the second lubricating oil passage is arranged at the shaft end of the clutch shaft, and the shaft end of the clutch shaft is connected to the lubricating oil hole.

[0013] Compared with the prior art, the advantages of the technical solution provided by the present invention are:

[0014] 1. The pressure oil channel and lubrication oil channel are arranged separately, which simplifies the complex oil circuit of the box, reduces the processing cost of the box, increases reliability, and reduces the probability of failure;

[0015] 2. The space structure of the gearbox is effectively utilized, which reduces the space occupied by the oil pipeline and facilitates the spatial layout of the whole machine;

[0016] 3. Separating the pressure oil and lubricating oil avoids the mutual interference between the pressure oil circuit and the lubricating oil circuit, which is beneficial to ensure the stability of the clutch pack pressure and improve the shifting quality;

[0017] 4. Combined with the control valve oil circuit, it can meet the clutch oil supply needs of multi-speed transmissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of a gearbox with separate layouts of lubricating oil channels and pressure oil channels.

[0019] Figure 2 It is a structural diagram of the main shell.

[0020] Figure 3 It is a schematic diagram of the structure of the control valve assembly.

[0021] Figure 4 It is a schematic diagram of the structure of the auxiliary shell.

[0022] Figure 5 It is a schematic diagram of the structure of the torque converter housing.

[0023] Figure 6 It is a schematic cross-sectional view of a clutch shaft in a clutch assembly.

[0024] Figure 7 It is a schematic diagram of another clutch shaft cross section in the clutch assembly. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with examples. It should be understood that these examples are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading this description, various equivalent modifications to this description by those skilled in the art fall within the scope defined by the claims attached to this application.

[0026] Please combine Figures 1 to 5 As shown, the gearbox with separate layout of lubricating oil passage and pressure oil passage in this embodiment includes a housing assembly 1, a control valve assembly 2 and a clutch assembly 3. The housing assembly 1 includes a main housing 11, a sub-housing 12 and a torque converter housing 13. The main housing 11 and the sub-housing 12 are connected to each other, the clutch assembly 3 is installed in the main housing 11 and the sub-housing 12, and multiple clutches of the clutch assembly 3 are pressed on the bearing mounting holes of the housing assembly 1. The torque converter housing 13 is connected to the other side of the sub-housing 12.

[0027] A control valve installation plane 1101 is processed on the outside of the main housing 11, and the control valve assembly 2 is fixedly installed on the control valve installation plane 1101 of the main housing 11 by bolt connection. The control valve assembly 2 is an integrated valve block structure, and a plurality of second pressure oil passages 2101 are cast on the surface of the valve body 21 of the integrated valve block. The valve body 21 is connected to the control valve installation plane 1101 through a sealing gasket to seal the oil circuit.

[0028] The specific oil circuit structure is as follows: the main housing 11 is provided with a first pressure oil passage 1102 parallel to the control valve installation plane 1101 on the inner side of the control valve installation plane 1101. The second pressure oil passage 2101 cast on the surface of the valve body 21 is connected to the first pressure oil passage 1102 and is controlled by the control valve 22 of the control valve assembly 2. The specific number of the second pressure oil passages 2101 depends on the gear requirements and the number of control valves. A pressure oil hole 1103 is also provided on the control valve installation plane 1101 of the main housing 11. The pressure oil hole 1103 is connected to the second pressure oil passage 2101 on the one hand, and is connected to the third pressure oil passages 3101, 3201 provided on the clutch shafts 31, 32 of the clutch assembly 3 on the other hand. The first pressure oil passage 1102, the second pressure oil passage 2101, and the third pressure oil passages 3101 and 3201 together constitute a passage for pressure oil, which is used to deliver the pressure oil pumped from the gearbox to the clutch assembly 3, thereby meeting the pressure oil demand of the clutch assembly 3. In addition, on the main housing 11, the first pressure oil passage 1102 also divides into a plurality of pressure measuring oil passages, which are sealed by the pressure measuring plug 4. These pressure measuring oil passages are used to connect an external pressure measuring device to monitor the main oil pressure. A first lubricating oil passage groove 1201 is provided at the end side of the auxiliary housing 12, and a second lubricating oil passage groove 1301 is provided at the end side of the torque converter housing 13. The auxiliary housing 12 and the torque converter housing 13 are fixed by threaded connection. The first lubricating oil passage groove 1201 and the second lubricating oil passage groove 1301 are combined to form the first lubricating oil passage. Since it is only necessary to ensure that the first lubricating oil passage is sealed, the first lubricating oil passage groove 1201 and the second lubricating oil passage groove 1301 do not need to be processed to fit perfectly, and the two can be connected by sealing. Four round holes are provided on the first lubricating oil channel groove 1201 of the auxiliary housing 12, which are lubricating oil holes 1202 and clutch shaft mounting holes. The position arrangement of the lubricating oil holes 1202 is the same as that of the clutch shaft. Figure 6 and Figure 7 As shown, the clutch shafts 31 and 32 of the clutch assembly 3 are provided with second lubricating oil passages 3102 and 3202, and the second lubricating oil passages 3102 and 3202 form inlets at the shaft ends of the clutch shafts 31 and 32. The first lubricating oil passage, the lubricating oil hole 1202 and the second lubricating oil passages 3102 and 3202 constitute lubricating oil passages for conveying lubricating oil from the gearbox 1 to the clutch assembly 3, thereby meeting the lubricating oil demand of the clutch assembly 3.

[0029] The pressure oil circuit and lubricating oil circuit of the clutch are described in detail below. Taking the operation of the K2 clutch in the clutch assembly 3 as an example, the pressure oil enters from the first pressure oil passage 1102 on the main housing 11, enters the control valve assembly 2 through the K2 oil port a 1104, and enters the K2 oil port b (pressure oil hole) 1103a corresponding to the valve and the main housing 11 through the second pressure oil passage 2101 of the control valve assembly 2. A groove is provided on the K2 clutch shaft 31, and both ends are sealed with sealing rings. The groove is connected to the third pressure oil passage 3101 through the K2 oil port b 1103a. The pressure oil only needs to flow into the groove and flow into the third pressure oil passage 3101 of the clutch shaft 31 through the oil passage where the K2 oil port b 1103a is located. Taking the operation of the K3 clutch in the clutch assembly 7 as an example, the pressure oil enters from the first pressure oil passage 1102 on the main housing 11, enters the control valve assembly 2 through the K2 oil port a 1104, enters the K3 oil port a (pressure oil hole) 1103b corresponding to the valve and the main housing through the second pressure oil passage 2101 of the control valve assembly 2, and flows into the third pressure oil passage 3201 of the clutch shaft 32 through the oil passage where the K3 oil port a 1103b is located.

[0030] The lubricating oil flows through the first lubricating oil passage between the auxiliary housing 12 and the torque converter housing 13, enters the second lubricating oil passage 3102 opened on the clutch shaft 31 through the K2 oil port c (lubricating oil hole) 1202a, and enters the second lubricating oil passage 3202 opened on the clutch shaft 32 through the K3 oil port b (lubricating oil hole) 1202b. Through the above process, the pressure oil and lubricating oil are delivered to the clutch pack, thereby meeting the working requirements of the clutch.

[0031] The box body of the present invention has a simple oil circuit, a compact structure and good reliability, and is particularly suitable for fixed-axis gearboxes and related structural engineering machinery.

Claims

1. A gearbox with separate layout of lubricating oil channel and pressure oil channel, It is characterized in that The invention comprises a housing assembly, a control valve assembly and a clutch assembly, wherein the housing assembly comprises a main housing, a sub-housing and a torque converter housing, the control valve assembly is installed on the main housing, the clutch assembly is installed between the main housing and the sub-housing, the main housing is processed with a first pressure oil passage and a pressure oil hole, the control valve assembly is provided with a control valve for controlling the on-off between the first pressure oil passage and the pressure oil hole, the control valve assembly is an integrated valve block structure, a second pressure oil passage is cast on the valve body of the integrated valve block, the second pressure oil passage is used to connect the first pressure oil passage and the pressure oil hole, the control valve is used to control the second pressure oil passage The pressure oil passage is opened and closed, and the pressure oil enters the clutch assembly through the first pressure oil passage and the pressure oil hole in sequence. The first lubricating oil passage formed by the sub-housing and the torque converter housing is connected to the second lubricating oil passage of the clutch shaft of the clutch assembly. The surface of the sub-housing and the surface of the torque converter housing are respectively provided with lubricating oil passage grooves, and the lubricating oil passage grooves are combined to form the first lubricating oil passage. The lubricating oil hole for connecting to the second lubricating oil passage is arranged in the lubricating oil passage groove of the sub-housing, and the inlet of the second lubricating oil passage is arranged at the shaft end of the clutch shaft, and the shaft end of the clutch shaft is connected to the lubricating oil hole.

2. The gearbox with separate layout of lubricating oil passage and pressure oil passage according to claim 1, It is characterized in that The main housing is provided with a plurality of pressure measuring ports, and the pressure measuring ports are communicated with the first pressure oil passage.

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