Wear-resistant heavy truck clutch pump

Abstract

The utility model belongs to the field of automobile accessories, and particularly relates to a wear-resistant heavy truck clutch pump which comprises a pump shell, a piston, a first leather cup and a second leather cup, the first leather cup and the second leather cup are sleeved at the front end and the rear end of the piston respectively, and the pump shell comprises a first section, a second section, a third section and a fourth section which are sequentially connected from front to back in the axial direction. The inner diameter of the first section is larger than the outer diameter of the first leather cup, the inner diameter of the second section is equal to the outer diameter of the first leather cup, the inner diameter of the third section is larger than the outer diameter of the second leather cup, and the inner diameter of the fourth section is equal to the outer diameter of the second leather cup. An oil inlet hole is formed in the end, close to the fourth subsection, of the third subsection, an oil outlet hole is formed in the rear end of the fourth subsection, and the oil inlet hole and the oil outlet hole are formed in two opposite faces respectively. The pump shell is of a multi-section type multi-diameter structure, so that the two leather cups cannot make contact with the pump shell when the piston moves, and the problem that the leather cups are prone to being damaged is solved.

Description

Technical Field

[0001] The utility model belongs to the field of automobile accessories, and in particular relates to a wear-resistant heavy-duty truck clutch pump. Background Art

[0002] The clutch master cylinder generally refers to the part connected to the clutch pedal and connected to the clutch booster through an oil pipe. Its function is to collect pedal stroke information and release the clutch through the booster. When the driver steps on the clutch pedal, the push rod pushes the master cylinder piston to increase the oil pressure, which enters the slave cylinder through a hose, forcing the slave cylinder pull rod to push the release fork and push the release bearing forward; when the driver releases the clutch pedal, the hydraulic pressure is released, and the release fork gradually returns to its original position under the action of the return spring, and the clutch is in the engaged state again.

[0003] When the clutch master pump is working, its piston will make linear reciprocating motion along the axial direction in the pump housing, and at the same time, the leather cup set on the piston will make contact friction motion with the inner surface of the pump housing. If the processing accuracy of the pump housing and piston is low or the inner surface of the pump housing is rough, the leather cup will be easily damaged during the operation of the clutch master pump, resulting in oil leakage, failure to build pressure and other undesirable phenomena, which will eventually cause the vehicle to be unable to drive on the road. Utility Model Content

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the problem that the leather cup in the existing clutch master cylinder is easily damaged by friction with the inner surface of the pump housing for a long time, causing the clutch master cylinder to leak oil and fail to build pressure.

[0005] In order to solve the above technical problems, the utility model provides a wear-resistant heavy-duty truck clutch pump, including a pump housing, a piston, a first leather cup and a second leather cup, the front and rear ends of the piston are respectively covered with the first leather cup and the second leather cup, the pump housing includes a first segment, a second segment, a third segment and a fourth segment connected in sequence from front to back along the axial direction, the inner diameter of the first segment is greater than the outer diameter of the first leather cup, the inner diameter of the second segment is equal to the outer diameter of the first leather cup, the inner diameter of the third segment is greater than the outer diameter of the second leather cup, the inner diameter of the fourth segment is equal to the outer diameter of the second leather cup, the third segment is provided with an oil inlet hole near one end of the fourth segment, the rear end of the fourth segment is provided with an oil outlet hole, and the oil inlet hole and the oil outlet hole are respectively arranged on two opposite sides.

[0006] Preferably, it also includes a guide assembly, which includes at least two sliders and two slide grooves, one end of the two sliders is fixed on the inner wall of the third segment, and the two sliders are arranged opposite to each other, and a slide groove is respectively provided at two opposite positions of the piston, and the other end of each slider is correspondingly located in one of the slide grooves.

[0007] Preferably, the outer shapes of the first segment, the second segment, the third segment and the fourth segment are all square structures with the same diameter.

[0008] Preferably, a rubber sheet is pasted in each of the slide grooves.

[0009] Preferably, the front end of the first segment is provided with an opening, and the opening is provided with a cover.

[0010] The technical solution of the utility model has the following beneficial effects:

[0011] During the process of the piston moving backward, the first leather cup keeps moving in the first segment, and the second leather cup keeps moving in the third segment, until the first leather cup hits the second segment, and the second leather cup hits the fourth segment, and the piston stops moving due to reaching the limit of movement. Since the inner diameter of the first segment is larger than the outer diameter of the first leather cup, the first leather cup cannot rub against the inner wall of the pump housing during movement, and since the inner diameter of the third segment is larger than the outer diameter of the second leather cup, the second leather cup cannot rub against the inner wall of the pump housing during movement. In this way, the first leather cup and the second leather cup will basically not be subject to significant wear and tear during normal use, extending their service life, and preventing the clutch pump from leaking oil due to damage to the first leather cup and the second leather cup, and failing to generate hydraulic pressure, causing the car to be unable to drive halfway. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Explanation of the accompanying drawings: 1. Pump housing; 11. First section; 12. Second section; 13. Third section; 14. Fourth section; 2. Piston; 3. First leather cup; 4. Second leather cup; 5. Guide assembly; 51. Slider; 52. Slide groove; 6. Rubber sheet; 7. Cover; 8. Oil inlet hole; 9. Oil outlet hole; 10. Coil spring.

[0014] Figure 1 It is an overall cross-sectional view of the utility model. DETAILED DESCRIPTION

[0015] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0017] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0018] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0019] The utility model provides a wear-resistant heavy-duty truck clutch pump, comprising a pump housing 1, a piston 2, a first leather cup 3 and a second leather cup 4, the front and rear ends of the piston 2 are respectively covered with the first leather cup 3 and the second leather cup 4, the pump housing 1 comprises a first segment 11, a second segment 12, a third segment 13 and a fourth segment 14 which are sequentially connected from front to back along the axial direction, the inner diameter of the first segment 11 is greater than the outer diameter of the first leather cup 3, the inner diameter of the second segment 12 is equal to the outer diameter of the first leather cup 3, the inner diameter of the third segment 13 is greater than the outer diameter of the second leather cup 4, the inner diameter of the fourth segment 14 is equal to the outer diameter of the second leather cup 4, an oil inlet hole 8 is provided at one end of the third segment 13 close to the fourth segment 14, an oil outlet hole 9 is provided at the rear end of the fourth segment 14, and the oil inlet hole 8 and the oil outlet hole 9 are respectively arranged on two opposite surfaces.

[0020] In the utility model, in the initial state, the first leather cup 3 is located in the first segment 11, the second leather cup 4 is located in the third segment 13, and the oil inlet hole 8 is located at the rear side of the second leather cup 4. At this time, the oil inlet hole 8 continuously enters the oil, and the oil outlet hole 9 continuously discharges the oil. When the piston 2 is subjected to external force from the front side (i.e., the driver steps on the clutch pedal), the piston 2 moves to the rear side, and at the same time, the first leather cup 3 and the second leather cup 4 move to the rear side. When the second leather cup 4 moves to the rear side of the oil inlet hole 8, the second leather cup 4 just cuts off the oil inlet channel, and also makes the volume of the hydraulic chamber on the rear side of the clutch pump smaller, thereby increasing the hydraulic pressure. Since the rear end of the piston 2 is connected to the rear end of the fourth segment 14 by a coil spring 10, when the piston 2 moves to the rear side, the coil spring 10 is compressed. When the piston 2 is released by the external force, the coil spring 10 automatically recovers due to the elastic potential, thereby pushing the piston 2 to the original position. The oil inlet channel of the clutch pump is opened again.

[0021] During the process of the piston 2 moving backward, the first leather cup 3 keeps moving in the first segment 11, and the second leather cup 4 keeps moving in the third segment 13, until the first leather cup 3 hits the second segment 12, and the second leather cup 4 hits the fourth segment 14, and the piston 2 stops moving due to reaching the limit of movement. Since the inner diameter of the first segment 11 is larger than the outer diameter of the first leather cup 3, the first leather cup 3 cannot rub against the inner wall of the pump housing 1 during movement, and since the inner diameter of the third segment 13 is larger than the outer diameter of the second leather cup 4, the second leather cup 4 cannot rub against the inner wall of the pump housing 1 during movement. In this way, the first leather cup 3 and the second leather cup 4 will basically not be subject to significant wear and tear during normal use, extending the service life of both, and preventing the clutch pump from leaking oil due to damage to the first leather cup 3 and the second leather cup 4, and the phenomenon of being unable to generate hydraulic pressure, causing the problem that the car cannot be driven halfway.

[0022] Since the inner diameters of the first section 11 and the third section 13 of the pump housing 1 are larger than the outer diameter of the leather cup, there are fewer places on the inner wall of the pump housing 1 that can support the piston 2, which will cause the piston 2 to have no support force when moving. The piston 2 cannot move straight forward when subjected to external force. Later, the first leather cup 3 and the second leather cup 4 become skewed, and cannot play the role of sealing the oil circuit. Therefore, the utility model sets a guide assembly 5, and the guide assembly 5 includes at least two sliders 51 and two slide grooves 52. One end of the two sliders 51 is fixed on the inner wall of the third section 13, and the two sliders 51 are arranged opposite to each other. A slide groove 52 is respectively provided at two opposite positions of the piston 2, and the other end of each slider 51 is correspondingly located in a slide groove 52. When the piston 2 moves, the slider 51 is always in the slide groove 52, and the slider 51 is fixed. The movement of the slider 51 provides guidance for the movement of the piston 2.

[0023] In order to facilitate the transportation, storage and installation of the pump body, the outer shapes of the first segment 11, the second segment 12, the third segment 13 and the fourth segment 14 are all square structures with the same diameter.

[0024] In order to prevent the inner wall of the slide groove 52 from being worn by the slide groove 51 after the slide groove 51 slides in the slide groove 52 for a long time, a rubber sheet 6 is pasted in each slide groove 52, and the slide groove 51 slides on the upper surface of the rubber sheet 6. In this way, even if it is worn, it is the rubber sheet 6 that is worn.

[0025] The front end of the first section 11 is provided with an opening, and the opening is provided with a cover 7. When the cover 7 is opened, the piston 2 can be loaded or replaced through the opening. In addition, since the rubber sheet 6 is often worn, it is convenient to replace the rubber sheet 6 on the slide groove 52 after the piston 2 is taken out.

[0026] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A wear-resistant heavy-duty truck clutch pump, comprising a pump housing (1), a piston (2), a first leather cup (3) and a second leather cup (4), wherein the front and rear ends of the piston (2) are respectively covered with the first leather cup (3) and the second leather cup (4), characterized in that: The pump housing (1) comprises a first segment (11), a second segment (12), a third segment (13) and a fourth segment (14) which are connected in sequence from front to back along the axial direction, the inner diameter of the first segment (11) is greater than the outer diameter of the first leather cup (3), the inner diameter of the second segment (12) is equal to the outer diameter of the first leather cup (3), the inner diameter of the third segment (13) is greater than the outer diameter of the second leather cup (4), the inner diameter of the fourth segment (14) is equal to the outer diameter of the second leather cup (4), the third segment (13) is provided with an oil inlet hole (8) at one end close to the fourth segment (14), the rear end of the fourth segment (14) is provided with an oil outlet hole (9), and the oil inlet hole (8) and the oil outlet hole (9) are respectively provided on two opposite surfaces.

2. A wear-resistant heavy truck clutch pump according to claim 1, characterized in that: The invention also comprises a guide assembly (5), wherein the guide assembly (5) comprises at least two sliders (51) and two slide grooves (52), one end of each of the two sliders (51) is fixed on the inner wall of the third section (13), and the two sliders (51) are arranged opposite to each other, and a slide groove (52) is respectively provided at two opposite positions of the piston (2), and the other end of each slider (51) is correspondingly located in one of the slide grooves (52).

3. The wear-resistant heavy truck clutch pump according to claim 2, characterized in that: The outer shapes of the first segment (11), the second segment (12), the third segment (13) and the fourth segment (14) are all square structures with the same diameter.

4. The wear-resistant heavy-duty truck clutch pump according to claim 2, characterized in that: A rubber sheet (6) is pasted in each of the slide grooves (52).

5. The wear-resistant heavy truck clutch pump according to claim 4, characterized in that: The first segment (11) has an opening at the front end, and the opening is provided with a cover (7).

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