Adjusting mechanism for bearing installation and plunger pump

Abstract

The utility model relates to the technical field of mechanical assembly, in particular to an adjusting mechanism for bearing installation and a plunger pump. An adjusting mechanism for bearing installation comprises a main shaft, a bearing and an installation seat, an inner ring of the bearing is in interference fit with the main shaft, an outer ring of the bearing is in transition fit with the installation seat, one end face of the bearing is provided with an outer flange abutting against a retaining shoulder of the main shaft, the other end face of the bearing is provided with an adjusting gasket, and one end face of the adjusting gasket is recessed inwards to form a lip. The lip wraps the bearing retainer protruding out of the bearing mounting face, an avoiding notch is formed in the edge of the other end face of the adjusting gasket, the adjusting gasket is provided with a center hole, and the inner diameter of the center hole is smaller than the caliber of the lip so that a blocking shoulder can be formed on the adjusting gasket. The lip of the adjusting gasket wraps the retainer part protruding out of the bearing installation face to play a role in protecting the bearing, the adjusting gasket can also be used as a bearing check ring, and a blocking shoulder formed on the adjusting gasket can also play a role in an oil seal check ring and can be used for fixing an oil seal.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical assembly, in particular to an adjusting mechanism for bearing installation and a plunger pump. Background Technique

[0002] In the traditional bearing installation method, as Figure 1 shown, the bearing 2 is directly installed between the main shaft 1 and the mounting seat 3. The mounting seat 3 and the main shaft 1 are fixed respectively. If the machining gap is large, the bearing 2 can move freely between the support point A (determined by the mounting seat 3 and the bearing 2) and the support point B (determined by the shoulder of the main shaft 1 and the bearing 2). With the in-depth study of the bearing operation, it is found that the installation clearance of the bearing 2 has a great influence on the bearing life. After the bearing is installed according to the traditional bearing installation method, the following deficiencies exist:

[0003] (1) The distance between the support point A and the support point B cannot be accurately controlled. Due to the accumulation of machining errors, the clearance of the installed bearing 2 will be too large or too small, affecting the bearing life;

[0004] (2) The mounting seat 3 is generally large in volume and made of casting material. The surface roughness and flatness at the support point A cannot be accurately controlled. After the bearing 2 is installed, the concentricity with the main shaft 1 is poor, affecting the bearing life:

[0005] (3) As Figure 2 shown, the protruding bearing cage 21 structure of the bearing 2 is prone to interference at the support point A. Machining the mating surface at the support point A according to the outer contour of the bearing 2 has a high processing cost and it is difficult to guarantee the processing accuracy. Summary of the Invention

[0006] The technical problem to be solved by the utility model is: to provide an adjusting structure for bearing installation and a plunger pump to solve the problems existing in the prior art in the above background technique.

[0007] The technical solution adopted by the utility model to solve its technical problems is: an adjusting mechanism for bearing installation, including a main shaft, a bearing and a mounting seat. The inner ring of the bearing is in interference fit with the main shaft, and its outer ring is in transitional fit with the mounting seat. One end face of the bearing has an outer flange that abuts against the shoulder of the main shaft, and an adjusting gasket is provided on the other end face. One end face of the adjusting gasket is recessed inward to form a lip, and the lip wraps the part of the bearing cage protruding from the bearing installation surface. The edge of the other end face of the adjusting gasket is provided with an avoidance notch. The adjusting gasket has a central hole, and the inner diameter of the central hole is smaller than the diameter of the lip to form a shoulder on the adjusting gasket.

[0008] Furthermore, the lip part is set as a fillet, a rectangle or an annular groove.

[0009] Further, the avoidance notch is configured as a fillet, a chamfer, or an annular groove structure.

[0010] Further, the outer diameter of the adjusting shim is less than or equal to the outer diameter of the bearing.

[0011] Further, the portion of the mounting seat in contact with the end face of the adjusting shim is provided as a flat surface.

[0012] Further, an oil seal is provided on the side of the adjusting shim away from the bearing. One end of the oil seal abuts tightly against the adjusting shim, and an annular retaining ring is provided at the other end thereof.

[0013] Furthermore, the outer edge of the oil seal is located on the shoulder of the adjusting shim.

[0014] There is also mentioned a plunger pump, which includes a housing with an open end, and further includes an adjusting mechanism for bearing installation as described in the above solution. One end of the main shaft is rotatably connected to the housing, the other end of the main shaft extends out of the housing, and the mounting seat is connected to and covers the opening of the housing.

[0015] Advantages of the present utility model:

[0016] The present utility model simplifies the machining of the mounting seat. Since the outer contour of the adjusting shim is almost a flat surface structure, only the portion of the mounting seat in contact with the adjusting shim needs to be machined into a flat surface;

[0017] The adjusting shim is provided with a lip and an avoidance notch according to the shape of a standard bearing, reducing the risk of interference;

[0018] The lip of the adjusting shim wraps around the cage portion protruding from the bearing mounting surface, playing a role in protecting the bearing. The adjusting shim can also be used as a bearing retaining ring, and the shoulder formed on the adjusting shim also serves as an oil seal retaining ring, which can be used to fix the oil seal;

[0019] The adjusting shim can select an appropriate thickness according to the measured distance to adjust the bearing clearance within the optimal range, improving the bearing service life and reducing noise. Description of the drawings

[0020] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0021] Figure 1 is a schematic structural diagram of bearing installation in the prior art.

[0022] Figure 2 is Figure 1 the schematic structural diagram of the bearing in

[0023] Figure 3 is the schematic structural diagram of the present utility model.

[0024] Figure 4It is a schematic structural diagram of the adjusting gasket in the present utility model.

[0025] Figure 5 It is a schematic structural diagram of the present utility model used on a plunger pump.

[0026] In the figure: 1, main shaft; 2, bearing; 21, bearing cage; 22, outer flange; 23, bearing mounting surface; 3, mounting seat; 4, adjusting gasket; 41, lip; 42, relief notch; 43, central hole; 44, shoulder; 5, oil seal; 6, annular retaining ring; 7, housing. Specific embodiments

[0027] Now, the present utility model will be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present utility model in a schematic manner, so they only show the components related to the present utility model.

[0028] As Figure 3 shown, an adjusting mechanism for bearing installation includes a main shaft 1, a bearing 2 and a mounting seat 3. The inner ring of the bearing 2 is in interference fit with the main shaft 1, and its outer ring is in transitional fit with the mounting seat 3. An outer flange 22 that abuts against the shoulder of the main shaft 1 is provided on one end face of the bearing 2, and an adjusting gasket 4 is provided on the other end face. As Figure 4 shown, a lip 41 is formed by inward depression on one end face of the adjusting gasket 4. The lip 41 encloses a part of the bearing cage 21 that protrudes from the bearing mounting surface 23. A relief notch 42 is provided at the edge of the other end face of the adjusting gasket 4. The adjusting gasket 4 has a central hole 43, and the inner diameter of the central hole 43 is smaller than the diameter of the lip 41 to form a shoulder 44 on the adjusting gasket 4.

[0029] As Figure 2 shown, since the bearing cage 21 protrudes from the bearing mounting surface 23, the mounting surface on the mounting seat 3 that cooperates with it cannot be made flat. Therefore, a lip 41 is provided on the adjusting gasket 4. The lip 41 is concave with respect to the end face of the adjusting gasket 4. After the adjusting gasket 4 is installed on one side of the bearing 2, the lip 41 encloses the bearing cage 21. The installation and selection of the bearing 2 can be more diversified. The shape of the lip 41 can be the rounded corner shown in the figure, or it can be a rectangle, an annular groove, etc. After using the adjusting gasket 4, the parts of the mounting seat 3 that contact the adjusting gasket 4 and the bearing 2 can all be machined into flat surfaces. As long as the flatness of these flat surfaces is ensured, it can be controlled by the adjusting gasket 4, and the adjusting gasket 4 can be processed in batches separately.

[0030] When the adjusting shim 4 is not provided, when the mounting seat 3 contacts the outer ring edge of the bearing 2, a fillet as small as possible needs to be machined at the contact position to avoid interference with the bearing 2; after the adjusting shim 4 is provided, a large fillet, a large chamfer or an annular groove can be machined at the contact between the bearing mounting surface 23 and the mounting seat 3, and the two are in direct contact, solving the problem of interference of the fillet of the outer ring of the bearing 2.

[0031] The outer diameter of the adjusting shim 4 is less than or equal to the outer diameter of the bearing 2. Used as a bearing retainer, it can prevent impact or contaminants from invading and damaging the bearing 2.

[0032] An oil seal 5 is provided on the side of the adjusting shim 4 away from the bearing 2. One end of the oil seal 5 abuts tightly against the adjusting shim 4, and the other end is provided with an annular retaining ring 6. Specifically: the outer edge of the oil seal 5 is located on the shoulder 44 of the adjusting shim 4. Because when a dirt-proof or sealing structure is required at the position of the bearing 2, components such as the oil seal 5 need to be installed. Such components need to be fixed on the main shaft 1 or the mounting seat 3. Generally, the fixing method is to use the annular retaining ring 6 to fix on both sides of components such as the oil seal 5 to prevent axial movement. And the adjusting shim 4 of this embodiment is provided with a shoulder 44, so it can play the role of fixing components such as the oil seal 2.

[0033] Before installing the bearing 2, according to the actual situation, first measure the distance between the support point A and the support point B, and select adjusting shims 4 with different thicknesses according to different distances. Specifically: according to the tolerances of existing parts such as the main shaft 1 and the mounting seat 3, calculate the dimensional tolerance to obtain that the thickness distance of the adjusting shim 4 is between 4.90 and 5.10. Divide the bearing clearance into one grade every 0.05 mm, and a total of five thickness specifications of adjusting shims 4 are required. The outer diameter and inner diameter of the adjusting shim 4 respectively correspond to the outer diameter and inner diameter of the bearing 2. For example: the bearing 2 has an outer diameter of 50 mm and an inner diameter of 20 mm. Therefore, the outer diameter of the adjusting shim 4 can be set to 49 mm and the inner diameter to 28 mm. The depth of the interference avoidance part of the adjusting shim 4 should correspond to the protruding distance of the bearing cage 21. If the protruding distance of the bearing cage 21 is 0.3 mm, the depth of the lip 21 of the adjusting shim 4 can be 2 mm. After the adjusting shim 4 is provided, a support point C is formed between the mounting seat 3 and one end face of the adjusting shim 4, and a support point D is formed between the other end face of the adjusting shim 4 and the bearing mounting surface 23.

[0034] As Figure 5 shown, a plunger pump includes a housing 7 with one end open and an adjusting mechanism for bearing installation in the above solution. One end of the main shaft 1 is rotatably connected to the housing 7, and the other end of the main shaft 1 extends out of the housing 7. The mounting seat 3 is connected and covers the opening of the housing 7.

[0035] Based on the above-mentioned ideal embodiments of the present utility model as inspiration, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this utility model. The technical scope of this utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An adjustment mechanism for bearing installation, comprising a main shaft (1), a bearing (2) and a mounting seat (3), characterized in that: The inner ring of the bearing (2) is in interference fit with the main shaft (1), and its outer ring is in transitional fit with the mounting seat (3). An outer flange (22) that abuts against the shoulder of the main shaft (1) is provided on one end face of the bearing (2), and an adjusting shim (4) is provided on the other end face. One end face of the adjusting shim (4) is recessed inward to form a lip (41). The lip (41) encloses a part of the bearing cage (21) that protrudes from the bearing mounting surface (23). A relief notch (42) is provided at the edge of the other end face of the adjusting shim (4). The adjusting shim (4) has a central hole (43), and the inner diameter of the central hole (43) is smaller than the diameter of the lip (41) to form a shoulder (44) on the adjusting shim (4).

2. The adjustment mechanism for bearing installation according to claim 1, characterized in that: The lip (41) is provided as a rounded corner, a rectangle or an annular groove.

3. The adjusting mechanism for bearing installation according to claim 1, characterized in that: The relief notch (42) is provided as a rounded corner, a chamfer or an annular groove structure.

4. The adjustment mechanism for bearing installation according to claim 1, characterized in that: The outer diameter of the adjusting shim (4) is smaller than or equal to the outer diameter of the bearing (2).

5. The adjustment mechanism for bearing installation according to claim 1, characterized in that: The part of the mounting seat (3) that contacts the end face of the adjusting shim (4) is provided as a flat surface.

6. The adjustment mechanism for bearing installation according to claim 1, characterized in that: An oil seal (5) is provided on the side of the adjusting shim (4) away from the bearing (2). One end of the oil seal (5) abuts tightly against the adjusting shim (4), and an annular retaining ring (6) is provided at the other end.

7. The adjusting mechanism for bearing installation according to claim 6, wherein: The outer edge of the oil seal (5) is located on the shoulder (44) of the adjusting shim (4).

8. A plunger pump, comprising a housing (7) with an opening at one end, characterized in that: It further includes an adjusting mechanism for bearing installation as described in any one of claims 1 to 7. One end of the main shaft (1) is rotatably connected to the housing (7), and the other end of the main shaft (1) extends out of the housing (7). The mounting seat (3) is connected to and covers the opening of the housing (7).

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