Gearbox and engineering machinery

By integrating the thermostat into the transmission, the external oil circuit of the transmission is simplified, the problems of poor lubrication effect and complex oil circuit during cold start are solved, more efficient temperature regulation and space utilization are achieved, and the transmission is extended service life.

CN119289074APending Publication Date: 2025-01-10GUANGXI LIUGONG MASCH CO LTD
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Patent Information

Application Number
CN202411664496.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-20
Publication Date
2025-01-10

AI Technical Summary

Technical Problem

The existing gearbox has low oil temperature and high viscosity during cold start, resulting in poor lubrication effect and easy to cause shifting lags. The external thermostat leads to complex oil circuits, many joints and large space occupancy.

Method used

Integrate the thermostat into the transmission, and by setting up the installation chamber and corresponding oil channels on the box, selective conduction of the thermostat is achieved, simplifying the external oil circuit, reducing the number of joints, and realizing it through the internal and external circulation oil channels. Temperature regulation.

Benefits of technology

It simplifies the external oil circuit of the transmission, reduces the number of joints, reduces assembly complexity and cost, improves space utilization, and extends the life of the transmission.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention belongs to the technical field of engineering machinery, and particularly relates to a gearbox and engineering machinery. The gearbox comprises a box body and a thermostat, the box body is provided with an outlet oil duct, a mounting cavity, an inner circulation oil duct and an outer circulation oil duct, the outlet oil duct is communicated with the mounting cavity, the mounting cavity is communicated with the inner circulation oil duct through a first communication port, and the mounting cavity is communicated with the outer circulation oil duct through a second communication port; the thermostat is arranged in the mounting cavity and selectively communicates with the first communicating opening or the second communicating opening. According to the gearbox, the mounting cavity is formed in the box body of the gearbox, and the oil outlet channel, the inner circulation oil channel and the outer circulation oil channel are correspondingly formed, so that the thermostat can be arranged in the box body of the gearbox, that is, the thermostat is integrated in the gearbox, the external oil way of the gearbox is simplified, the number of connectors is reduced, the assembling steps are simplified, and the cost is reduced; and the occupied space is reduced.
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Description

Technical Field

[0001] The present invention relates to the technical field of engineering machinery, and in particular to a gearbox and engineering machinery. Background Art

[0002] When the engine is cold started, the gearbox oil temperature is low, the oil viscosity is high, and the gearbox lubrication effect is very poor. The engine can only be warmed up by driving at a low speed. During this process, gear shifting is prone to jamming, and the loader operation efficiency is low. As the gearbox runs, a certain amount of power loss will be converted into heat energy, causing the gearbox oil temperature to rise. If the oil temperature reaches a certain level, it will cause changes in the performance of the lubricating oil, reduce viscosity, and accelerate aging and deterioration. If the lubricating oil film is damaged, it will lose its lubricating effect, causing damage to the gear meshing tooth surface or bearing surface, causing equipment failure and a great impact on the life of the gearbox. Therefore, controlling the temperature of the gearbox oil is an effective means to improve the mechanical efficiency of the gearbox, reduce vehicle fuel consumption, and extend the life of the gearbox.

[0003] In the related art, in order to adjust the temperature of the gearbox, a thermostat and a radiator are arranged outside the gearbox, the oil outlet of the gearbox is connected to the oil inlet of the thermostat through a first pipeline, the first oil outlet of the thermostat is connected to the first inlet of the three-way valve through a second pipeline, the second oil outlet of the thermostat is connected to the oil inlet of the radiator through a third pipeline, the oil outlet of the radiator is connected to the second inlet of the three-way valve through a fourth pipeline, and the outlet of the three-way valve is connected to the oil inlet of the gearbox through a fifth pipeline. When the oil temperature of the gearbox is lower than the critical temperature of the thermostat, the circulating oil route is gearbox→thermostat→gearbox; when the oil temperature of the gearbox is higher than the critical temperature of the thermostat, the circulating oil route is gearbox→radiator→thermostat→gearbox. The disadvantage of the related art is that the thermostat is located outside the gearbox, and the thermostat cuts the external pipeline into multiple sections, resulting in a complex oil circuit, a large number of joints, easy assembly errors, and takes up a large space. Summary of the invention

[0004] The object of the present invention is to provide a gearbox and engineering machinery, which can simplify the external oil circuit of the gearbox, reduce the number of joints, simplify the assembly steps, reduce costs, and reduce space occupancy.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] Gearbox, including:

[0007] The box body is provided with an outlet oil passage, a mounting cavity, an inner circulation oil passage and an outer circulation oil passage, wherein the outlet oil passage is connected with the mounting cavity, the mounting cavity is connected with the inner circulation oil passage via a first connecting port, and the mounting cavity is connected with the outer circulation oil passage via a second connecting port;

[0008] A thermostat is disposed in the installation cavity, and the thermostat selectively connects the first communication port or the second communication port.

[0009] As an optimal technical solution for the gearbox, the thermostat includes a thermostat housing and a thermostat body, the thermostat housing has an inner cavity, the thermostat body is arranged in the inner cavity of the thermostat housing, the thermostat housing is arranged in the installation cavity, and the inner cavity of the thermostat housing is connected to the installation cavity, and the thermostat housing is connected to the box body.

[0010] As a preferred technical solution of the gearbox, it also includes an end cover, which blocks the opening of the inner cavity of the thermostat housing.

[0011] As a preferred technical solution of the gearbox, it also includes a first sealing ring, which is arranged on the outer peripheral wall of the end cover and abuts against the inner wall of the inner cavity of the thermostat housing.

[0012] As a preferred technical solution of the gearbox, it also includes a second sealing ring, which is arranged on the outer peripheral wall of the thermostat housing and abuts against the inner wall of the installation cavity.

[0013] As a preferred technical solution of the gearbox, the thermostat housing and the box body are connected by bolts.

[0014] As a preferred technical solution of the gearbox, the thermostat includes a thermostat body, and the thermostat body is arranged in the installation cavity.

[0015] As a preferred technical solution of the gearbox, it also includes an end cover, which blocks the opening of the installation cavity.

[0016] As a preferred technical solution of the gearbox, it also includes a first sealing ring, which is arranged on the outer peripheral wall of the end cover and abuts against the inner wall of the installation cavity.

[0017] The engineering machinery comprises a radiator and a gearbox as described in any of the above schemes, wherein the outer circulation oil channel is connected to the inlet of the radiator through a first pipeline, and the outlet of the radiator is connected to the inlet of the box through a second pipeline.

[0018] Beneficial effects of the present invention:

[0019] The present invention provides a gearbox, including a housing and a thermostat. The housing is provided with an outlet oil passage, a mounting cavity, an inner circulation oil passage and an outer circulation oil passage. The outlet oil passage is connected to the mounting cavity. The mounting cavity is connected to the inner circulation oil passage through a first connecting port, and the mounting cavity is connected to the outer circulation oil passage through a second connecting port. The thermostat is arranged in the mounting cavity, and the thermostat selectively conducts the first connecting port or the second connecting port. By arranging the mounting cavity on the housing of the gearbox, and correspondingly opening the outlet oil passage, the inner circulation oil passage and the outer circulation oil passage, the thermostat can be built into the housing of the gearbox, that is, the gearbox of the present invention integrates the thermostat, simplifies the external oil circuit of the gearbox, reduces the number of joints, simplifies the assembly steps, reduces the cost, and reduces the space occupied.

[0020] The present invention also provides an engineering machine, comprising a radiator and a gearbox provided by the present invention, wherein the outer circulation oil passage of the gearbox is connected to the inlet of the radiator, and the outlet of the radiator is connected to the inlet of the box. By adopting the gearbox provided by the present invention, the oil circuit can be simplified, the number of joints can be reduced, the assembly steps can be simplified, the cost can be reduced, and the space utilization rate can be higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of a partially exploded structure of a gearbox provided in Embodiment 1 of the present invention;

[0022] Figure 2 It is a front view of the box involved in the first embodiment of the present invention;

[0023] Figure 3 is a half-section view of the box involved in the first embodiment of the present invention;

[0024] Figure 4 is a schematic diagram of the exploded structure of the gearbox involved in the first embodiment of the present invention;

[0025] Figure 5 is a cross-sectional view of the gearbox involved in the first embodiment of the present invention;

[0026] Figure 6 is a schematic diagram of the exploded structure of the gearbox involved in the second embodiment of the present invention;

[0027] Figure 7 It is a cross-sectional view of the gearbox involved in the second embodiment of the present invention.

[0028] In the figure:

[0029] 10. Box body; 11. Outlet oil channel; 12. Installation cavity; 13. Internal circulation oil channel; 14. External circulation oil channel; 20. Thermostat; 21. Thermostat body; 22. Thermostat housing; 30. End cover; 40. Retaining ring; 51. First sealing ring; 52. Second sealing ring; 60. Bolt; 71. First pipeline; 72. Second pipeline. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0031] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0034] Embodiment 1

[0035] like Figures 1 to 5As shown, the present invention provides a gearbox, including a housing 10 and a thermostat 20. The housing 10 is provided with an outlet oil passage 11, a mounting cavity 12, an inner circulation oil passage 13 and an outer circulation oil passage 14. The outlet oil passage 11 is connected with the mounting cavity 12. The mounting cavity 12 is connected with the inner circulation oil passage 13 through a first connecting port. The mounting cavity 12 is connected with the outer circulation oil passage 14 through a second connecting port. The thermostat 20 is arranged in the mounting cavity 12. The thermostat 20 selectively conducts the first connecting port or the second connecting port.

[0036] When the oil temperature in the housing 10 is lower than the critical temperature of the thermostat 20, the thermostat 20 opens the first connecting port, and the oil in the housing 10 flows from the outlet oil passage 11 to the thermostat 20 in the mounting cavity 12, and flows to the inner circulation oil passage 13 through the thermostat 20 and the first connecting port. Figure 2 The middle route S1, and then flows from the internal circulation oil passage 13 to the inside of the housing 10 for forced lubrication of the bearing, thereby completing the internal circulation of the oil; when the oil temperature in the housing 10 is equal to or higher than the critical temperature of the thermostat 20, the thermostat 20 is connected to the second connecting port, and the oil in the housing 10 flows from the outlet oil passage 11 to the thermostat 20 in the installation cavity 12, and flows to the external circulation oil passage 14 through the thermostat 20 and the second connecting port, refer to Figure 2 The middle route S2 then flows to the radiator through the external circulation oil passage 14, and after the heat is dissipated by the radiator, flows back to the inside of the housing 10 for forced lubrication of the bearings, thereby completing the external circulation of the oil.

[0037] By providing a mounting cavity 12 on the case 10 of the gearbox, and correspondingly opening an oil outlet passage, an inner circulation oil passage 13, and an outer circulation oil passage 14, the thermostat 20 can be built into the case 10 of the gearbox, that is, the gearbox of the present invention integrates the thermostat 20 therein, thereby simplifying the external oil circuit of the gearbox, reducing the number of joints, simplifying the assembly steps, reducing costs, and reducing space occupancy.

[0038] Reference Figure 4 and Figure 5 In this embodiment, the thermostat 20 includes a thermostat housing 22 and a thermostat body 21. The thermostat housing 22 has an inner cavity. The thermostat body 21 is arranged in the inner cavity of the thermostat housing 22. The thermostat housing 22 is arranged in the installation cavity 12, and the inner cavity of the thermostat housing 22 is connected to the installation cavity 12. The thermostat housing 22 is connected to the housing 10. That is, in this embodiment, the thermostat 20 is an integral structure, which can be integrally installed on the housing 10 or disassembled from the housing 10, and the disassembly and maintenance of the thermostat 20 are more convenient. Optionally, the thermostat housing 22 and the housing 10 can be connected by bolts 60, and the connection method is simple and firm. Of course, the thermostat housing 22 and the housing 10 can also be connected by riveting or clamping, etc., which is not limited to this embodiment.

[0039] Further, the gearbox further includes an end cover 30, which blocks the opening of the inner cavity of the thermostat housing 22. Optionally, one end of the end cover 30 is limited by the step surface of the inner cavity of the thermostat housing 22, and the other end is limited by the retaining ring 40. Further, the gearbox further includes a first sealing ring 51, which is arranged on the outer peripheral wall of the end cover 30 and abuts against the inner wall of the inner cavity of the thermostat housing 22 to seal the gap between the retaining ring 40 and the inner cavity of the thermostat housing 22, thereby ensuring the sealing of the inner cavity of the thermostat housing 22.

[0040] Furthermore, the gearbox also includes a second sealing ring 52 , which is disposed on the outer peripheral wall of the thermostat housing 22 and abuts against the inner wall of the installation cavity 12 to seal the gap between the thermostat housing 22 and the installation cavity 12 to ensure the sealing of the installation cavity 12 .

[0041] The specific structure and working principle of the thermostat 20 are all prior art and will not be described in detail here.

[0042] Embodiment 2

[0043] like Figure 6 and Figure 7 As shown, the thermostat 20 provided in this embodiment is basically the same as that in the first embodiment. For the sake of simplicity, this embodiment only describes the differences from the first embodiment. In this embodiment, the thermostat 20 includes a thermostat body 21, and the thermostat body 21 is disposed in the mounting cavity 12. That is, in this embodiment, the thermostat 20 and the housing 10 are an integrated structure, and the thermostat housing 22 is omitted, which is lower in cost.

[0044] Further, the gearbox further includes an end cover 30, which blocks the opening of the installation cavity 12. Optionally, one end of the end cover 30 is limited by a step surface in the installation cavity 12, and the other end is limited by a retaining ring 40. Further, the gearbox further includes a first sealing ring 51, which is arranged on the outer peripheral wall of the end cover 30 and abuts against the inner wall of the installation cavity 12 to seal the gap between the retaining ring 40 and the installation cavity 12, thereby ensuring the sealing of the installation cavity 12.

[0045] The specific structure and working principle of the thermostat 20 are all prior art and will not be described in detail here.

[0046] The present invention also provides an engineering machine, comprising a radiator and a gearbox as in the first or second embodiment, wherein the outer circulation oil passage 14 of the gearbox is connected to the inlet of the radiator through a first pipeline 71, and the outlet of the radiator is connected to the inlet of the box 10 through a second pipeline 72. Figure 1 By adopting the above gearbox, the oil circuit can be simplified (the number of pipelines is reduced from 5 to 2), the number of joints can be reduced, the assembly steps can be simplified, the cost can be reduced, and the space utilization rate can be higher.

[0047] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A gearbox, characterized in that: include: The housing (10) is provided with an outlet oil passage (11), a mounting chamber (12), an inner circulation oil passage (13) and an outer circulation oil passage (14); the outlet oil passage (11) is connected to the mounting chamber (12); the mounting chamber (12) and the inner circulation oil passage (13) are connected via a first communication port; and the mounting chamber (12) and the outer circulation oil passage (14) are connected via a second communication port; A thermostat (20) is disposed in the installation cavity (12), and the thermostat (20) selectively connects the first communication port or the second communication port.

2. The gearbox according to claim 1, characterized in that: The thermostat (20) comprises a thermostat housing (22) and a thermostat body (21); the thermostat housing (22) has an inner cavity; the thermostat body (21) is arranged in the inner cavity of the thermostat housing (22); the thermostat housing (22) is arranged in the installation cavity (12); the inner cavity of the thermostat housing (22) is connected to the installation cavity (12); and the thermostat housing (22) is connected to the housing (10).

3. The gearbox according to claim 2, characterized in that: It also includes an end cover (30), wherein the end cover (30) blocks the opening of the inner cavity of the thermostat housing (22).

4. The gearbox according to claim 3, characterized in that: It also includes a first sealing ring (51), which is arranged on the outer peripheral wall of the end cover (30) and abuts against the inner wall of the inner cavity of the thermostat housing (22).

5. The gearbox according to claim 2, characterized in that: It also includes a second sealing ring (52), which is arranged on the outer peripheral wall of the thermostat housing (22) and abuts against the inner wall of the installation cavity (12).

6. The gearbox according to claim 2, characterized in that: The thermostat housing (22) and the box body (10) are connected via bolts (60).

7. The gearbox according to claim 1, characterized in that: The thermostat (20) comprises a thermostat body (21), and the thermostat body (21) is arranged in the installation cavity (12).

8. The gearbox according to claim 7, characterized in that: It also includes an end cover (30), wherein the end cover (30) blocks the opening of the installation cavity (12).

9. The gearbox according to claim 8, characterized in that: It also includes a first sealing ring (51), which is arranged on the outer peripheral wall of the end cover (30) and abuts against the inner wall of the installation cavity (12).

10. Construction machinery, characterized in that: It comprises a radiator and a gearbox as claimed in any one of claims 1 to 9, wherein the outer circulation oil channel (14) is connected to the inlet of the radiator through a first pipeline (71), and the outlet of the radiator is connected to the inlet of the housing (10) through a second pipeline (72).