Lubricating structure for travel motor

Abstract

The utility model discloses a lubricating structure for a travel motor, which comprises a swash plate and a servo piston, and the lower end face of the swash plate is in contact with the end face of the servo piston. An oil channel is formed in the swash plate, the oil channel penetrates through the upper end face and the lower end face of the swash plate, and oil in the shell is conveyed to the matching face of the swash plate and the servo piston. An oil channel is additionally formed in the swash plate, oil is guided to enter a gap between the lower end face of the swash plate and the end face of the servo piston to form an oil film, the lubrication effect is provided for the matching face of the swash plate and the servo piston, abrasion of the matching face of the swash plate and the servo piston is reduced, the product performance of the swash plate and the servo piston is improved, and the service life of the swash plate and the servo piston is prolonged. And meanwhile, the problem that chippings generated in the abrasion process of the swash plate and the servo piston pollute hydraulic oil and damage other parts can be solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of traveling motors, and particularly relates to a lubrication structure for a traveling motor. Background Art

[0002] The statements herein only provide the background art related to the utility model, and do not necessarily constitute the prior art.

[0003] A traveling motor is a mechanical device specifically designed to be connected to a wheel or a crawler drive wheel, which can convert the hydraulic pressure energy provided by a hydraulic pump into the mechanical energy of its output shaft to drive the motor to rotate. By the flow of hydraulic oil and the angle change of the swash plate used in the traveling motor, the output speed and torque of the motor can be controlled, thereby realizing the movement of the traveling motor, low-speed driving, high-speed driving, release of overspeed and parking brake, as well as high-low speed switching and automatic switching.

[0004] In the prior art, by equipping the traveling motor with a high-pressure automatic variable device, the gear can be automatically changed according to the driving resistance. When the high-speed gear is engaged, the circuit is connected to the oil inlet of the manual transmission oil port, pushing the shift valve to move leftward, making the motor become a small displacement; if the driving resistance increases and the oil pressure rises to the set value, the oil pushes the shift valve to move rightward, and the motor automatically becomes a large displacement low-speed gear to increase the torque.

[0005] The inventor found that during the process of the angle change of the swash plate, due to the lack of a special lubrication structure to lubricate the mating surface of the swash plate and the servo piston, therefore, the friction force between the swash plate and the end face of the servo piston is relatively large, and wear marks are easily generated, affecting the performance and service life of the swash plate and the servo piston. Moreover, during the wear process, wear debris is easily generated between the lower end face of the swash plate and the end face of the servo piston. On the one hand, it will contaminate the hydraulic oil in the traveling motor, and on the other hand, the debris will flow into other components along with the hydraulic oil, affecting the performance and service life of other components. Summary of the Utility Model

[0006] The purpose of the utility model is to overcome the above-mentioned deficiencies existing in the prior art, and provide a lubrication structure for a traveling motor. By adding an oil passage on the swash plate, the hydraulic oil is guided into the gap between the swash plate and the servo piston to form an oil film, reducing the wear of the mating surface of the swash plate and the servo piston.

[0007] To achieve the above purpose, the utility model is realized by the following technical solutions:

[0008] The technical solution of the utility model provides a lubrication structure for a traveling motor, including: a swash plate and a servo piston, the lower end face of the swash plate is in contact with the end face of the servo piston; an oil passage is opened on the swash plate, and the oil passage penetrates through the upper end face and the lower end face of the swash plate to transport the internal oil of the housing to the mating surface of the swash plate and the servo piston.

[0009] In at least one embodiment, there are two oil passages, which are symmetrically distributed.

[0010] In at least one embodiment, the lower end face of the swash plate is a plane.

[0011] In at least one embodiment, the end face of the servo piston is a plane.

[0012] In at least one embodiment, a plunger is further included, and the head of the plunger is in close contact with the upper end face of the swash plate.

[0013] In at least one embodiment, the oil port at the upper end of the swash plate is within the moving range of the plunger of the travel motor.

[0014] In at least one embodiment, the oil port at the lower end of the swash plate is within the range of the servo piston.

[0015] In at least one embodiment, a return spring plate is provided between the plunger and the upper end face of the swash plate; the return spring plate is provided with a through hole; the head of the plunger passes through the through hole and is in close contact with the upper end face of the swash plate.

[0016] The present utility model further provides a travel motor, which includes a swash plate, a servo piston, and the lubrication structure for the travel motor as described above.

[0017] In at least one embodiment, the travel motor further includes a housing, and the swash plate and the servo piston are installed in the housing; the lubrication structure introduces the oil inside the housing into the mating surface between the swash plate and the servo piston.

[0018] The beneficial effects of the technical solution of the present utility model are as follows:

[0019] A lubrication structure for a travel motor of the present utility model includes a swash plate and a servo piston, and the lower end face of the swash plate and the end face of the servo piston are in contact with each other to form a contact surface. By adding an oil passage on the swash plate, the oil is guided into the gap between the lower end face of the swash plate and the end face of the servo piston to form an oil film, which provides lubrication for the mating surface between the swash plate and the servo piston, reduces the wear of the mating surface between the swash plate and the servo piston, improves the product performance and service life of the swash plate and the servo piston; at the same time, it can avoid the problems that the debris generated during the wear of the swash plate and the servo piston contaminate the hydraulic oil and damage other components. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings forming a part of this specification are used to provide a further understanding of the present utility model, and the schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation to the present utility model.

[0021] Figure 1It is a schematic structural diagram of a lubrication structure for a traveling motor of the present utility model;

[0022] In the figure: 1. Housing; 2. Return disk; 3. Swash plate; 4. Servo piston; 5. Plunger; 6. First oil passage; 7. Second oil passage.

[0023] The distances or dimensions between each part are exaggerated for showing the positions of each part, and the schematic diagram is only for illustration. Specific embodiments

[0024] It should be noted that the following detailed description is exemplary and is intended to provide further illustration of the present utility model. Unless otherwise specified, all technical and scientific terms used in the present utility model have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present utility model belongs.

[0025] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present utility model. As used herein, unless the present utility model clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof;

[0026] For the convenience of description, if the words "upper", "lower", "left", and "right" appear in the present utility model, they only indicate the same directions as the upper, lower, left, and right of the attached drawings themselves, and do not limit the structure. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0027] Term explanation part: Terms such as "installation", "connection", "connection", and "fixation" in the present utility model should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral body; it can be a mechanical connection, an electrical connection, 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 those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0028] As introduced in the background art, the purpose of the present utility model is to overcome the deficiencies in the above-mentioned prior art, and provide a lubrication structure for a traveling motor. By adding an oil passage on the swash plate 3, guiding the oil to enter the gap between the swash plate 3 and the servo piston 4 to form an oil film, the wear of the mating surface between the swash plate 3 and the servo piston 4 is reduced.

[0029] Embodiment 1

[0030] As Figure 1 shown, this embodiment discloses a lubrication structure for a walking motor, including: a swash plate 3 and a servo piston 4, and the lower end surface of the swash plate 3 is in contact with the end surface of the servo piston 4 to form a mating surface. An oil passage is opened on the swash plate 3, and the oil passage penetrates through the upper end surface and the lower end surface of the swash plate 3, so that the upper end surface of the swash plate 3 is communicated with the end surface of the servo piston 4, and the oil inside the housing 1 flowing to the upper end surface of the swash plate 3 is conveyed to the mating surface of the swash plate 3 and the servo piston 4. The oil forms an oil film in the gap between the lower end surface of the swash plate 3 and the end surface of the servo piston 4, seeps out from the edge of the end surface of the servo piston 4, provides lubrication for the mating surface of the swash plate 3 and the servo piston 4, and reduces the wear of the mating surface.

[0031] Since the servo piston is symmetric, in order to ensure balanced force, in this embodiment, two oil passages are opened on the swash plate 3, namely a first oil passage 6 and a second oil passage 7, and the first oil passage 6 and the second oil passage 7 are symmetrically distributed.

[0032] In this embodiment, the lower end surface of the swash plate 3 and the end surface of the servo piston 4 are both flat structures. When the angle of the swash plate 3 changes, the two end surfaces are in contact with each other to form a mating surface.

[0033] In this embodiment, the lubrication structure for the walking motor further includes a plunger 5. The head of the plunger 5 is in close contact with the upper end surface of the swash plate 3. Driven by the swash plate 3, the plunger 5 makes a cyclic movement in the housing 1. During the movement, the high-pressure oil inside the housing 1 flows out to the upper end surface of the swash plate 3, and the high-pressure oil on the upper end surface of the swash plate 3 enters the gap between the swash plate 3 and the servo piston 4 through the oil passage.

[0034] In order to make the high-pressure oil flowing out of the plunger 5 more easily enter the oil passage and flow to the end surface of the servo piston 4, in this embodiment, the opening range of the oil port at the upper end of the swash plate 3 is controlled within the movement range of the plunger 5 of the walking motor, and the opening range of the oil port at the lower end of the swash plate 3 is controlled within the range of the servo piston 4.

[0035] In this embodiment, a return spring plate 2 is arranged between the plunger 5 and the upper end surface of the swash plate 3. The return spring plate 2 is provided with through holes, and the number of the through holes matches the number of the plungers 5. The head of each plunger 5 passes through the corresponding through hole and is in close contact with the upper end surface of the swash plate 3. The movement of the plunger 5 is controlled by the return spring plate 2, and the oil suction process is realized during the cyclic movement of the plunger 5.

[0036] In order to ensure that the oil flows smoothly to the mating surface of the swash plate 3 and the servo piston 4 and does not affect the performance of the swash plate 3, in this embodiment, the aperture of the oil passage is set to 2-3 mm.

[0037] Based on the above lubrication structure, this embodiment further provides a travel motor, which is composed of a swash plate 3, a servo piston 4, and a lubrication structure. Through the lubrication structure, the oil discharged during the cyclic movement of the plunger 5 can enter the gap between the lower end face of the swash plate 3 and the end face of the servo piston 4 to form an oil film, providing lubrication for the mating surface of the swash plate 3 and the servo piston 4, reducing the wear of the mating surface of the swash plate 3 and the servo piston 4, and improving the product performance and service life of the travel motor. At the same time, it can avoid the problems of contamination of the hydraulic oil by the debris generated during the wear of the swash plate and the servo piston and damage to other components, ensuring the stability and reliability of the travel motor.

[0038] The travel motor further includes a housing 1. The swash plate 3 and the servo piston 4 are installed in the housing 1. The lubrication structure introduces the internal oil of the housing 1 to the mating surface of the swash plate 3 and the servo piston 4 to ensure stable lubrication conditions during the operation of the motor.

[0039] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A lubrication structure for a traveling motor, characterized in that, Comprising: A swash plate and a servo piston, the lower end face of the swash plate being in contact with the end face of the servo piston; an oil passage is formed in the swash plate, and the oil passage penetrates through the upper end face and the lower end face of the swash plate to convey the internal oil of the housing to the mating surface between the swash plate and the servo piston.

2. The lubricating structure for a walking motor according to claim 1, characterized in that, There are two oil passages, which are symmetrically distributed.

3. The lubrication structure for a walking motor according to claim 1, characterized in that The lower end face of the swash plate is a plane.

4. A lubrication structure for a walking motor according to claim 1, characterized in that, The end face of the servo piston is a plane.

5. A lubrication structure for a walking motor according to claim 1, characterized in that, It further comprises a plunger, and the head of the plunger is in close contact with the upper end face of the swash plate.

6. The lubrication structure for a traveling motor according to claim 3, characterized in that, The oil port at the upper end of the swash plate is within the moving range of the plunger of the travel motor.

7. A lubrication structure for a walking motor according to claim 1, characterized in that, The oil port at the lower end of the swash plate is within the range of the servo piston.

8. The lubrication structure for a walking motor according to claim 3, wherein, A return spring plate is arranged between the plunger and the upper end face of the swash plate; the return spring plate is provided with a through hole; the head of the plunger passes through the through hole and is in close contact with the upper end face of the swash plate.

9. A traveling motor, characterized in that, Comprising a swash plate, a servo piston and a lubricating structure for a travel motor according to any one of claims 1-8.

10. A walking motor according to claim 9, characterized in that, It further comprises a housing, and the swash plate and the servo piston are installed in the housing; the lubricating structure introduces the internal oil of the housing into the mating surface between the swash plate and the servo piston.

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