Gear oil pump with adjustable meshing clearance and installation method thereof

Abstract

A gear oil pump with adjustable meshing clearance and an installation method thereof, relating to the technical field of oil pumps, the gear oil pump with adjustable meshing clearance comprises a pump body, an oil pump transmission gear and a crankshaft transmission gear, the oil pump transmission gear is mounted on the oil pump driving shaft, the crankshaft transmission gear is mounted on the engine crankshaft, an oil pump installation positioning sleeve hole is provided on the mounting surface of the pump body, a mounting positioning sleeve is installed in the gap in the oil pump installation positioning sleeve hole; the oil pump installation positioning sleeve hole is a stepped hole with a smaller diameter from outside to inside, the stepped hole comprises a large hole and a small hole connected thereto, the diameter of the large hole is 8mm, the depth of the large hole is 4mm, the gap between the installation positioning sleeve and the large hole is 0.015mm, the length of the installation positioning sleeve is 7.5mm, and the oil pump transmission gear and the crankshaft transmission gear are both helical gears. The gear oil pump provided by the invention can well solve the problem that the gear meshing clearance is not well controlled when assembling a traditional oil pump with gears facing inward.

Description

Technical Field

[0001] The invention relates to the technical field of oil pumps, and in particular to a gear oil pump with adjustable meshing clearance and a mounting method thereof. Background Art

[0002] As we all know, the role of the oil pump in the automobile lubrication system is to increase the oil to a certain pressure and then force it to the moving surfaces of various engine parts. According to the structural form, the oil pump is mainly divided into a gear oil pump and a rotor oil pump. Among them, the gear oil pump is divided into two types according to the different engine layouts: the gear faces outward (the gear is located on the outside of the pump body) and the gear faces inward (the gear is located between the pump body and the cylinder body). At present, the installation method of the oil pump with the gear facing outward is relatively simple. Two locating pins are used to position the oil pump transmission gear and the crankshaft transmission gear. Since the gear faces outward and can be seen by the installer, the installer can rotate the two gears to align them, and then assemble the two gears together after confirming the gap. The installation method of the oil pump with the gear facing inward is different from the above. Although the two gears are positioned using locating pins, the gears are facing inward and cannot be seen. Therefore, the two gears have to be slowly moved closer together until they engage. In fact, this installation method makes it more difficult to control the accuracy of gear meshing, especially for the oil pump whose drive gear and crankshaft drive gear are not on the same horizontal plane. It is even more difficult to control the gap between the two gears to achieve an ideal state, which is basically impossible to achieve. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a gear oil pump with adjustable meshing clearance and a mounting method thereof.

[0004] In order to solve the above technical problems, the present invention provides a gear oil pump with adjustable meshing clearance, including a pump body, an oil pump transmission gear and a crankshaft transmission gear, the oil pump transmission gear is installed on the oil pump driving shaft, the crankshaft transmission gear is installed on the engine crankshaft, and an oil pump mounting positioning sleeve hole is opened on the mounting surface of the pump body, and a mounting positioning sleeve is installed in the gap in the oil pump mounting positioning sleeve hole.

[0005] Furthermore, the oil pump mounting sleeve hole is a stepped hole with a diameter decreasing from the outside to the inside, and the stepped hole includes a large hole and a small hole connected thereto. The diameter of the large hole is 7-9 mm, the depth of the large hole is 3-5 mm, the gap between the mounting sleeve and the large hole is 0.003-0.027 mm, and the length of the mounting sleeve is 7-8 mm.

[0006] Furthermore, the diameter of the large hole is 8 mm, the depth of the large hole is 4 mm, the gap between the installation positioning sleeve and the large hole is 0.015 mm, and the length of the installation positioning sleeve is 7.5 mm.

[0007] Furthermore, the oil pump transmission gear and the crankshaft transmission gear are both helical gears.

[0008] As another aspect of the present invention, a method for installing the gear oil pump is characterized by comprising the following steps:

[0009] Step 1: Insert the installation locating sleeve tightly into the cylinder body installation locating sleeve hole, the two are interference fit, and one end of the installation locating sleeve extends out of the cylinder body installation locating sleeve hole;

[0010] Step 2: Put the pump body onto the installation positioning sleeve through the pump body installation positioning sleeve hole, and the two are in good clearance;

[0011] Step 3: With the installation locating sleeve as the central axis, rotate the pump body counterclockwise or clockwise relative to the engine cylinder block, so that the pump body moves closer to the engine cylinder block from the far end until the oil pump drive gear and the crankshaft drive gear are fully meshed;

[0012] Step 4: First, place the limit auxiliary tooling close to one side of the pump body so that the pump body will be blocked by the limit auxiliary tooling when it rotates in the opposite direction, and then retreat the limit auxiliary tooling according to the preset distance;

[0013] Step 5: Rotate the pump body in the opposite direction until the pump body contacts the limit auxiliary tooling;

[0014] Step 6. Use screws to fix the pump body to the engine block. The entire installation process is completed.

[0015] Compared with the traditional gear oil pump, the gear oil pump provided by the present invention has an oil pump installation positioning sleeve hole on the pump body and is equipped with an installation positioning sleeve, the installation positioning sleeve is fixed on the engine cylinder body, and the pump body can be rotatably mounted on the installation positioning sleeve through the oil pump installation positioning sleeve hole. Under this structure, the pump body can rotate relative to the engine cylinder body so that the oil pump transmission gear and the crankshaft transmission gear are meshed. In addition, the gear oil pump provided by the present invention can be adjusted according to design requirements by adjusting the distance of the limit auxiliary tooling retreat and rotating the pump body in the opposite direction to obtain different meshing clearances of the two gears. It can be seen from the summary that the gear meshing clearance of the gear oil pump involved in the present invention is adjustable, and the adjustment method is simple, ingenious, and easy to operate. In other words, this gear oil pump can solve the problem of poor control of gear meshing clearance with a better installation method. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the gear oil pump involved in the present invention;

[0017] Figure 2 for Figure 1 Cross-sectional view along the AA direction.

[0018] The accompanying drawings are marked as follows:

[0019] B——engine cylinder blockC——limit auxiliary toolingD——cylinder block installation positioning sleeve hole

[0020] 1——Pump body 2——Oil pump transmission gear 3——Crankshaft transmission gear

[0021] 4 - Oil pump installation positioning sleeve hole 5 - Installation positioning sleeve 6 - Installation surface

[0022] 4a——large hole 4b——small hole. DETAILED DESCRIPTION

[0023] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments and drawings. The contents mentioned in the implementation modes are not intended to limit the present invention.

[0024] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying 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 element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0025] In the description of the present invention, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection of two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meaning of the terms can be understood according to the specific circumstances.

[0026] like Figure 1 and Figure 2As shown, the gear oil pump with adjustable meshing clearance provided in this embodiment includes a pump body 1, an oil pump transmission gear 2 and a crankshaft transmission gear 3. It is worth mentioning that the gear oil pump involved in the present invention can be an oil pump with gears facing outward or an oil pump with gears facing inward. In order to better understand the present invention, this embodiment exemplifies an oil pump with gears facing inward. Specifically, the oil pump transmission gear 2 of the oil pump is installed on the oil pump driving shaft and extends from one side of the mounting surface 6 of the pump body 1, while the crankshaft transmission gear 3 is installed on the engine crankshaft. One side of the engine cylinder B is provided with a notch for the oil pump transmission gear 2 to rotate into the engine cylinder B during the later installation. Here, it should be noted that the distance that the oil pump transmission gear 2 extends from the mounting surface 6 is closely related to the height of the crankshaft transmission gear 3 in the engine cylinder B. After the oil pump is installed, the oil pump transmission gear 2 and the crankshaft transmission gear 3 may be located on the same horizontal plane or not. In any case, both should be in a state of meshing with each other. Next, it is necessary to explain the core point of the present invention: an oil pump mounting positioning sleeve hole 4 is provided on the mounting surface 6 of the pump body 1, and correspondingly, Figure 2 As shown, a cylinder block mounting locating sleeve hole D is provided on the engine block B, and the gear oil pump also includes a mounting locating sleeve 5. The structure of the mounting locating sleeve 5 is designed in the present invention to have a positioning function when the oil pump is installed on the engine block B.

[0027] As mentioned in the previous background technology, the traditional installation method of the oil pump with the gear facing inward is not effective. It is difficult to control the accuracy of the gear meshing by slowly moving the two gears closer together until they mesh. The gear oil pump provided by the above embodiment can solve this problem well. Specifically, the installation method of the gear oil pump provided by this embodiment is as follows:

[0028] First, insert the installation locating sleeve 5 tightly into the cylinder installation locating sleeve hole D, the two are interference fit, and one end of the installation locating sleeve 5 extends out of the cylinder installation locating sleeve hole D;

[0029] Second, put the pump body onto the installation positioning sleeve 5 through the pump body installation positioning sleeve hole 4, and the two are in clearance fit;

[0030] Third, with the installation locating sleeve 5 as the central axis, rotate the pump body 1 counterclockwise (or clockwise) relative to the engine cylinder B, so that the pump body 1 gradually approaches the engine cylinder B from the far end until the oil pump drive gear 2 and the crankshaft drive gear 3 are fully meshed (the meshing clearance is 0);

[0031] Fourth, first place the limit auxiliary tooling C close to one side of the pump body 1 (the reverse rotation of the pump body 1 will be blocked by the limit auxiliary tooling C), and then retreat the limit auxiliary tooling C according to the preset distance;

[0032] Fifth, the pump body 1 is rotated in the reverse direction until the pump body 1 contacts the limit auxiliary tooling C. At this time, the oil pump drive gear 2 and the crankshaft drive gear 3 are meshed together with an ideal clearance;

[0033] Sixth, use screws to fix the pump body 1 on the engine cylinder block B, and the entire installation process is completed.

[0034] Regarding the above-mentioned installation method, it is worth mentioning that the relationship between the retreat distance of the limit auxiliary tooling C and the size of the meshing clearance between the two gears needs to be verified in advance. After verification, different gear meshing clearances can be adjusted according to design requirements by adjusting the retreat distance of the limit auxiliary tooling C and rotating the pump body 1 in reverse. It can be seen that the installation method in this embodiment can well solve the problem of poor control of the gear meshing clearance.

[0035] As we know, in the present invention, when the pump body 1 is assembled on the engine cylinder block B, the pump body 1 needs to be rotated around the installation positioning sleeve 5. In order to make the rotation angle sufficient to facilitate the adjustment of the size of the gear meshing clearance, the installation positioning sleeve 5 needs to deviate from the center of the oil pump transmission gear 2. Here, preferably, as Figure 1 As shown, the oil pump mounting locating sleeve hole 4 for assembling the mounting locating sleeve 5 is opened at a position close to the edge of the mounting surface 6 of the pump body 1 .

[0036] In this embodiment, the oil pump mounting positioning sleeve hole 4 is a stepped hole whose diameter decreases from the outside to the inside. The stepped hole includes a large hole 4a and a small hole 4b connected thereto. The diameter of the large hole 4a is 8 mm, and the depth of the large hole 4a is 4 mm. The gap between the mounting positioning sleeve 5 and the large hole 4a is 0.015 mm, and the length of the mounting positioning sleeve 5 is 7.5 mm.

[0037] It is worth emphasizing that the gear oil pump involved in the present invention has an oil pump transmission gear 2 and a crankshaft transmission gear 3 which can be spur gears or helical gears. Regardless of which type of gear, the aforementioned installation method is applicable.

[0038] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention may also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the protection scope of the present invention.

[0039] In order to make it easier for ordinary technicians in the field to understand the improvements of the present invention over the prior art, some drawings and descriptions of the present invention have been simplified, and for the sake of clarity, some other elements are omitted in this application document. Ordinary technicians in the field should realize that these omitted elements may also constitute the content of the present invention.

Claims

1. A gear oil pump with adjustable meshing clearance, comprising a pump body (1), an oil pump transmission gear (2) and a crankshaft transmission gear (3), wherein the oil pump transmission gear (2) is mounted on an oil pump driving shaft, and the crankshaft transmission gear (3) is mounted on an engine crankshaft, characterized in that: An oil pump mounting positioning sleeve hole (4) is provided on the mounting surface (6) of the pump body (1), and a mounting positioning sleeve (5) is installed in the gap in the oil pump mounting positioning sleeve hole (4); The method for installing the gear oil pump comprises the following steps: Step 1: Insert the installation locating sleeve (5) tightly into the cylinder body installation locating sleeve hole (D), the two are interference fit, and one end of the installation locating sleeve (5) extends out of the cylinder body installation locating sleeve hole (D); Step 2: Put the pump body (1) onto the installation positioning sleeve (5) through the oil pump installation positioning sleeve hole (4), and the two are clearance-matched; Step 3: With the installation positioning sleeve (5) as the central axis, rotate the pump body (1) counterclockwise or clockwise relative to the engine cylinder body (B) so that the pump body (1) approaches the engine cylinder body (B) from the far end until the oil pump drive gear (2) and the crankshaft drive gear (3) are fully meshed; Step 4: First, place the limit auxiliary tooling (C) tightly against one side of the pump body (1) so that when the pump body (1) rotates in the opposite direction, it will be blocked by the limit auxiliary tooling (C), and then withdraw the limit auxiliary tooling (C) according to the preset distance; Step 5: Rotate the pump body (1) in the reverse direction until the pump body (1) contacts the limit auxiliary tooling (C); Step 6. Use screws to fix the pump body (1) to the engine block (B). The entire installation process is completed.

2. The gear oil pump with adjustable meshing clearance according to claim 1, characterized in that: The oil pump mounting sleeve hole (4) is a stepped hole with a diameter decreasing from the outside to the inside, the stepped hole comprising a large hole (4a) and a small hole (4b) connected thereto, the large hole (4a) having a diameter of 7-9 mm, a depth of 3-5 mm, a clearance between the mounting sleeve (5) and the large hole (4a) of 0.003-0.027 mm, and a length of the mounting sleeve (5) of 7-8 mm.

3. The gear oil pump with adjustable meshing clearance according to claim 2, characterized in that: The diameter of the large hole (4a) is 8 mm, the depth of the large hole (4a) is 4 mm, the gap between the installation positioning sleeve (5) and the large hole (4a) is 0.015 mm, and the length of the installation positioning sleeve (5) is 7.5 mm.

4. The gear oil pump with adjustable meshing clearance according to claim 3, characterized in that: The oil pump transmission gear (2) and the crankshaft transmission gear (3) are both helical gears.

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