A method and apparatus for controlling gear pump side clearance
By setting a stepped surface with a height difference on the tooling, the gears and intermediate plate of the gear pump are machined simultaneously, which solves the problem of consistent backlash in the gear pump and improves the machining accuracy of the gear pump.
Patent Information
- Application Number
- CN202311642910.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-01
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2043-12-01
AI Technical Summary
Existing technologies struggle to effectively control the consistency of the backlash in gear pumps, leading to unstable leakage and affecting the pump's accuracy and efficiency.
By setting a first step surface and a second step surface with a height difference on the tooling, and by placing the gear end face and the intermediate plate of the gear pump on different step surfaces and performing synchronous machining, the side clearance of the gear pump can be controlled.
Precise control of the gear pump's backlash was achieved, ensuring the gear pump's machining accuracy and consistency, reducing leakage, and improving the overall performance of the gear pump.
Smart Images
Figure CN120080198B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of gear pump processing technology, and in particular to a processing method and apparatus for controlling the backlash of a gear pump. Background Technology
[0002] There are four main sources of internal leakage in gear pumps:
[0003] I. End Face Clearance Leakage: Gear pump end face clearance leakage refers to leakage between the gear end face and the parallel plane of the bushing or side plate / cover plate. The main leakage path of gear pumps is that the leakage amount is directly proportional to the cube of the clearance size and pressure, generally accounting for about 80% of the total leakage.
[0004] 2. Leakage at the gear meshing line: Radial clearance leakage of gear pumps refers to the leakage of high-pressure oil into the low-pressure chamber through the gap between the tooth tip circle and the pump body bore. This part of the leakage is generally 10%-15% of the total leakage.
[0005] 3. Leakage at the gear meshing line: Poor contact at the meshing line, such as tooth profile error, causes the meshing line to be loose along the tooth width direction, resulting in high-pressure oil leaking into the low-pressure chamber through the meshing line.
[0006] 4. Leakage at the external seal: The gear pump has an external sealing ring between the front and rear covers and the pump body for end face sealing, ensuring that the hydraulic system does not leak oil to the outside of the pump during operation. If the flatness is poor, the sealing ring is not fully compressed, or the front and rear covers or pump body are deformed, the gap here will increase, leading to hydraulic oil leakage.
[0007] Currently, the main method for controlling the backlash of gear pumps relies on the tolerance of the gear thickness and the tolerance of the gear pump's intermediate plate. During the manufacturing process, the part is considered qualified if the machining dimensions are within the range specified in the drawing. However, in the actual assembly process, it is difficult to ensure that the backlash is consistent after assembly. If the gear thickness is close to the lower tolerance and the intermediate plate thickness is close to the upper tolerance, the backlash will increase, making it difficult to ensure consistent gear pump accuracy. Summary of the Invention
[0008] The purpose of this invention is to provide a processing method and apparatus for controlling the backlash of a gear pump, thereby solving the aforementioned technical problems.
[0009] The technical solution adopted in this invention is as follows:
[0010] A machining method for controlling the backlash of a gear pump, comprising:
[0011] S1. Set up a fixture, and set up two stepped surfaces with a height difference on the fixture. The height difference is the gear pump side clearance that needs to be controlled.
[0012] S2. Install the gear pump on the tooling, place the gear end face of the gear pump on the higher step surface, and place the side of the gear pump's intermediate plate on the lower step surface; and limit the gear in the X, Y, and Z directions.
[0013] S3. Place the fixed gear and intermediate plate on a grinding machine for synchronous processing. Grinding to the designated position can ensure the processing backlash of the gear pump.
[0014] Preferably, the two stepped surfaces include a first stepped surface and a second stepped surface, wherein the upper surface of the first stepped surface is higher than the upper surface of the second stepped surface.
[0015] A machining apparatus for controlling the backlash of a gear pump includes a tooling, the tooling including a positioning plate, a first step surface and a second step surface, the upper end of the positioning plate is provided with the second step surface, the upper end of the second step surface is provided with the first step surface, and the upper surface of the first step surface is higher than the upper surface of the second step surface.
[0016] As a further preferred embodiment, it also includes a gear fixing member, wherein at least one of the gear fixing members is provided on the upper surface of the first stepped surface.
[0017] As a further preferred embodiment, two connecting holes are provided on the second step surface, and the two connecting holes are located on both sides of the first step surface.
[0018] As a further preferred embodiment, the second step surface is magnetic.
[0019] As a further preferred embodiment, the gear fixing component includes, but is not limited to, a gear fixing pin, a gear fixing rod, and a gear fixing block.
[0020] The above technical solution has the following advantages or beneficial effects:
[0021] In this invention, by setting a first step surface and a second step surface with a height difference on the tooling, and the height difference between the first step surface and the second step surface can be adjusted as needed, the backlash of the gear pump can be effectively controlled, ensuring the machining accuracy of the gear pump. Attached Figure Description
[0022] Figure 1 This is a schematic diagram of the processing device used to control the backlash of the gear pump in this invention;
[0023] Figure 2 This is a diagram showing the usage state of the processing device used to control the backlash of the gear pump in this invention;
[0024] Figure 3 This is a cross-sectional view of the gear pump in this invention;
[0025] Figure 4This is an exploded schematic diagram of the gear pump in this invention.
[0026] In the diagram: 1. Tooling; 2. Positioning plate; 3. First step surface; 4. Second step surface; 5. Gear fixing component; 6. Connecting hole; 7. Gear pump; 8. Intermediate plate; 9. Gear; 10. First side plate; 11. Second side plate; 12. Auxiliary rotating shaft; 13. Through pin; 14. Bolt; 15. Oil seal unit; 16. Drive shaft; 17. Gear pump side clearance. Detailed Implementation
[0027] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0028] In the description of this invention, it should be noted that terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for 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 limitations on this invention. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0029] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0030] Figure 1 This is a schematic diagram of the processing device used to control the backlash of the gear pump in this invention; Figure 2 This is a diagram showing the usage state of the processing device used to control the backlash of the gear pump in this invention; Figure 3 This is a cross-sectional view of the gear pump in this invention; Figure 4 This is an exploded view of the gear pump in this invention. Please refer to [link / reference]. Figures 1 to 4 The diagram illustrates a preferred embodiment of a machining method for controlling the backlash of a gear pump 7, comprising:
[0031] S1. Set up a fixture 1, and set up two stepped surfaces with a height difference on the fixture 1. The height difference is the side clearance of the gear pump 7 that needs to be controlled.
[0032] S2. Install the gear pump 7 on the fixture 1, place the gear end face of the gear pump 7 on the higher step surface, and place the side of the intermediate plate 8 of the gear pump 7 on the lower step surface; and limit the gear 9 in the X, Y, and Z directions.
[0033] S3. Place the fixed gear 9 and intermediate plate 8 on a grinding machine for synchronous processing. Grinding to the designated position ensures the machining backlash of the gear pump 7. In this embodiment, the two stepped surfaces include a first stepped surface 3 and a second stepped surface 4. The upper surface of the first stepped surface 3 is higher than the upper surface of the second stepped surface 4. The gear end face of the gear pump 7 abuts against the first stepped surface 3, and the side of the intermediate plate 8 of the gear pump 7 abuts against the second stepped surface 4. By controlling the height difference between the first stepped surface 3 and the second stepped surface 4, the machining backlash of the gear pump 7 can be satisfied, thus effectively controlling the backlash of the gear pump 7 and ensuring the machining accuracy of the gear pump 7.
[0034] The clearance between the gear 9 and the side plate of the gear pump 7 is mainly determined by the dimensional tolerance of the gear 9 and the intermediate plate 8. This processing method necessarily requires processing the two parts separately and then assembling them together. In the implementation of this invention, the end face of the gear 9 and the side of the intermediate plate 8 are placed together for end face grinding in the last step. The difference between the thickness of the gear 9 and the thickness of the intermediate plate 8 is equal to the side clearance between the end face of the gear and the side plate.
[0035] The structure of the device involved in this invention will be described below:
[0036] This invention provides a machining device 1 for controlling the backlash of a gear pump 7, comprising a tooling 1. The tooling 1 includes a positioning plate 2, a first stepped surface 3, and a second stepped surface 4. The upper end of the positioning plate 2 is provided with the second stepped surface 4, and the upper end of the second stepped surface 4 is provided with the first stepped surface 3. The upper surface of the first stepped surface 3 is higher than the upper surface of the second stepped surface 4. See also... Figure 1 As shown, by setting a second step surface 4 on the upper surface of the positioning plate 2 and setting a first step surface 3 on the second step surface 4, it can cooperate with the side of the intermediate plate 8 in the gear pump 7 and the end face of the gear in the gear pump 7, so that the intermediate plate 8 of the gear pump 7 can be processed synchronously, ensuring the processing backlash of the gear pump 7 and ensuring the processing accuracy.
[0037] Furthermore, as a preferred embodiment, it also includes a gear fixing member 5, with at least one gear fixing member 5 provided on the upper surface of the first stepped surface 3. The gear fixing member 5 includes, but is not limited to, a gear fixing pin, a gear fixing rod, and a gear fixing block. See also Figure 1As shown, two gear fixing parts 5 are provided on the upper surface of the first step surface 3. The gear fixing parts 5 are selected as gear fixing pins, which can be inserted into the gear pump 7 to limit the gear pump 7 in the X and Y directions and avoid the X and Y direction offset during processing.
[0038] Furthermore, as a preferred embodiment, two connecting holes 6 are provided on the second step surface 4, and the two connecting holes 6 are located on both sides of the first step surface 3. The connecting holes 6 are bolt holes, which are used to cooperate with bolts to lock and fix the gear pump 7 onto the positioning plate 2.
[0039] Furthermore, as a preferred embodiment, the second step surface 4 is magnetic, used to attract the gear pump 7, thereby limiting the gear pump 7 in the Z direction, and locking it with bolts. The surface of the second step surface 4 may be provided with a magnet, making the second step surface 4 magnetic, or the entire second step surface 4 may be made of magnet.
[0040] The specific structure of the gear pump 7 in this embodiment can be found in [reference needed]. Figure 1 and Figure 2 As shown, the gear pump 7 includes an intermediate plate 8, two gears 9 disposed within the intermediate plate 8, and a first side plate 10 and a second side plate 11 disposed on both sides of the intermediate plate 8. The first side plate 10 is mounted on the intermediate plate 8 via an auxiliary rotating shaft 12, and the gears 9 are mounted on the intermediate plate 8 via through pins 13. The second side plate 11 is connected to the intermediate plate 8 and the first side plate 10 via bolts 14. An oil seal unit 15 is provided on the second side plate 11, and the drive shaft 16 passes through the oil seal unit 15 and the second side plate 11 and is connected to one of the gears 9.
[0041] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.
Claims
1. A machining method for controlling the backlash of a gear pump, characterized in that, include: S1. Set up a fixture, and set up two stepped surfaces with a height difference on the fixture. The height difference is the gear pump side clearance that needs to be controlled. S2. Install the gear pump on the tooling, place the gear end face of the gear pump on the higher step surface, and place the side of the gear pump's intermediate plate on the lower step surface; and limit the gear in the X, Y, and Z directions. S3. Place the fixed gear and intermediate plate on a grinding machine for synchronous processing. Grinding to the designated position will ensure the processing backlash of the gear pump.
2. The machining method for controlling the backlash of a gear pump as described in claim 1, characterized in that, The two stepped surfaces include a first stepped surface and a second stepped surface, wherein the upper surface of the first stepped surface is higher than the upper surface of the second stepped surface.
3. A machining apparatus for implementing the machining method for controlling the backlash of a gear pump as described in claim 1, characterized in that, The tooling includes a positioning plate, a first step surface, and a second step surface. The upper end of the positioning plate is provided with the second step surface, and the upper end of the second step surface is provided with the first step surface. The upper surface of the first step surface is higher than the upper surface of the second step surface.
4. The processing apparatus as described in claim 3, characterized in that, It also includes a gear fixing component, and at least one of the gear fixing components is provided on the upper surface of the first stepped surface.
5. The processing apparatus as described in claim 3, characterized in that, Two connecting holes are provided on the second step surface, and the two connecting holes are located on both sides of the first step surface.
6. The processing apparatus as described in claim 3, characterized in that, The second step surface is magnetic.
7. The processing apparatus as described in claim 4, characterized in that, The gear fixing component includes a gear fixing pin, a gear fixing rod, or a gear fixing block.
Citation Information
Patent Citations
Machining device for controlling backlash of gear pump
CN221517112U