WO2020258538A1

WO2020258538A1 - High-precision mounting hole structure

Info

Publication number: WO2020258538A1
Application number: PCT/CN2019/106531
Authority: WO
Inventors: 向本杰; 蒙小聪; 覃文; 王鹏程; 黎华文; 王志刚; 余晓强; 卢祥林; 罗威; 田战胜
Original assignee: 广西玉柴机器股份有限公司
Priority date: 2019-06-28
Filing date: 2019-09-18
Publication date: 2020-12-30
Also published as: CN110344962A; CN110344962B

Abstract

A high-precision mounting hole structure, comprising a mounting surface (3) which, in the form of an inner circumferential surface structure, fits an outer circumferential surface of a cylindrical component, and a sealing plane (4) located at one side of the inner end of the mounting surface (3); the sealing plane (4) is used to seal and fit a front end of the cylindrical component, a first chamfer (301) is provided at an inner edge of the mounting surface (3), a second chamfer (401) is provided at an edge of the sealing plane (4), the first chamfer (301) is connected to the second chamfer (401), and a shoulder structure is formed at a connection position between the first chamfer (301) and the second chamfer (401). The radial surface and the bottom surface of a hole are machined separately, the precision requirements of the radial surface and the bottom surface of the hole are both met, avoiding the influence, on assembling, of machining residual connecting marks of the two surfaces.

Description

A high-precision mounting hole structure

Technical field

The invention relates to the technical field of engine assembly and manufacturing, in particular to a high-precision mounting hole structure.

Background technique

In the field of engine assembly and manufacturing, the engine cylinder block or cylinder head needs to be assembled with other precision parts or parts that need to be matched and sealed with the mounting parts, such as cylinder block oil pump mounting holes or idler gear shaft mounting holes, etc., the aperture side is the oil pump The installation hole needs to be matched with the oil pump with high precision. The bottom surface of the hole is a sealing surface and needs to seal the high-pressure oil. Therefore, the empty bottom surface needs to be sealed with the oil pump. The radial and bottom surfaces of the hole have higher precision machining requirements. It is difficult to ensure the accuracy of the bottom surface of the hole and the surface of the aperture at the same time during processing, because the two surfaces are processed separately, and it is difficult to ensure the requirements of perpendicularity and roughness. For example, Chinese patent CN107780992A discloses an oil pump oil return structure of an engine. The structure mentions an integrated oil pump installation groove on the cylinder block, the oil pump is installed in the oil pump installation groove, and the oil pump is installed The bottom sealing surface of the groove and the mounting surface are in direct contact. It is difficult to ensure the accuracy of the bottom surface of the hole and the surface of the aperture during processing, and it is difficult to ensure the requirements of verticality and roughness.

In the prior art, in the oil pump installation hole structure, since the oil pump sealing surface needs to form a sealing belt with the oil pump to seal high-pressure oil up to 0.8MPa, the roughness and flatness of the oil pump sealing surface and the oil pump installation surface Relative tolerances, such as verticality, require higher requirements. Basically, the two faces are obtained by different processes. At present, there are equipment that can guarantee the processing of both faces at the same time. The traditional method is to make an R1 fillet where the two faces meet as shown in Figure 1. Or, as shown in Figure 2, make a bevel with a height of H and an angle of θ to connect the two surfaces, but no matter which structure is adopted, a joint mark of indefinite height will be formed on the two surfaces. If it is on the sealing tape, it will cause If the seal is not tight, the oil pump will be difficult to assemble or jam on the radial surface, so the height of the transfer mark needs to be controlled.

Summary of the invention

The invention provides a high-precision mounting hole structure. The radial surface and the bottom surface of the hole are spaced apart, which can not only meet the accuracy requirements of the radial surface and the bottom surface of the hole during processing, but also avoid the processing residual junction marks of the two surfaces from affecting assembly.

The technical solution of the present invention is as follows: a high-precision mounting hole structure, arranged on the cylinder block, for mounting cylindrical components, including a mounting surface that cooperates with the outer ring surface of the cylindrical component to form an inner ring surface structure, and is located at the mounting surface The sealing plane on the side of the inner end of the surface, the sealing plane is used to seal and fit the front end of the cylindrical component, the inner edge of the mounting surface is provided with a first chamfer, and the edge of the sealing plane is provided with a second chamfer , The first chamfer and the second chamfer are connected, and the joint of the first chamfer and the second chamfer is a shoulder structure.

In the present invention, a shoulder is used to separate the mounting surface and the sealing plane, that is, the first chamfer and the second chamfer are steps to form a shoulder, and the mounting surface and the sealing plane Separate settings, processing the first chamfer and the second chamfer on the respective processing bottom surface, respectively, can control the range of the respective processing transfer marks and control the depth of the transfer marks;

It is realized that the mounting surface and the sealing plane are separately processed to ensure relative accuracy while preventing the transfer marks from affecting the function of the oil pump. Since the transfer marks after the mounting surface and the sealing plane are separately processed are separately controlled, there will be no mutual influence of the transfer marks, and the processing of the mounting surface and the sealing plane does not affect each other, therefore, It can not only ensure the accuracy of the installation position of the outer ring surface of the cylindrical component, but also ensure the processing accuracy of the sealing surface, and avoid the problems that the bottom surface cannot be sealed or the radial surface cannot be assembled.

Preferably, the high-precision mounting hole structure further includes a third chamfer located between the first chamfer and the second chamfer, and the third chamfer is more than one, which may form one or more A shoulder makes the distance between the mounting surface and the sealing plane farther, and better control of the height of the joint mark between the mounting surface and the sealing plane.

Preferably, the first chamfer is one of a rounded corner or an oblique corner, and the second chamfer is one of a rounded corner or an oblique corner, and adopts a structure that is convenient for processing, simple processing, and low cost.

Preferably, the front end of the cylindrical component is provided with an introduction angle. The leading-in angle of the front end of the cylindrical component can avoid the shoulder formed by the first chamfering and the second chamfering structure, avoiding interference, and preventing the cylindrical component from supporting the The phenomenon of high-precision mounting hole structure and easy installation.

Preferably, the cylindrical component is an oil pump. After the oil pump is installed in the high-precision mounting hole structure, it is necessary to ensure the accuracy of the position of the oil pump and prevent the oil pump gear and its meshing gear from being too large. It produces a lot of noise. At the same time, the radial accuracy of the oil pump mounting hole, such as roughness, verticality, cylindricity, position, etc., has high requirements, otherwise it is difficult to ensure the assembly requirements of the oil pump, so the oil pump is very suitable for all The high-precision mounting hole structure has a better installation effect.

Preferably, the high-precision mounting hole structure is integrally formed and arranged on the cylinder block, the structure is simple, the structure is directly processed on the cylinder block, the installation steps are saved, the structure is strong, and the structure is compact.

The beneficial effects of the present invention are:

1. The present invention separates the use of shoulders between the mounting surface and the sealing plane, which can respectively control the range of the respective processing transfer marks and the depth of the transfer marks, which can ensure the installation position of the outer ring surface of the cylindrical component The degree of accuracy is accurate, and the processing accuracy of the sealing plane can be guaranteed. The relative accuracy of the two surfaces is also guaranteed, avoiding the problem that the bottom surface cannot be sealed or the radial surface cannot be assembled.

2. In the present invention, the mounting surface and the sealing plane are separated by a shoulder instead of being directly connected. After the mounting surface and the sealing plane are processed separately, there is no need to consider the height control of the joint marks between the two. Improve the processing efficiency.

3. The structure is simple. The first chamfer and the second chamfer are rounded or beveled, which can form a processing shoulder, with simple processing and low cost.

Description of the drawings

Fig. 1 and Fig. 2 are structural schematic diagrams of the connection between the radial surface of the mounting hole and the hole bottom surface of the oil pump in the prior art.

Fig. 3 is a schematic structural diagram of the joint between the mounting surface and the sealing plane of a high-precision mounting hole structure according to the present invention.

Fig. 4 is a structural schematic diagram of a high-precision mounting hole structure of the present invention when an oil pump is installed.

Fig. 5 is a schematic structural diagram of Embodiment 3 of the present invention.

Fig. 6 is a schematic structural diagram of Embodiment 4 of the present invention.

In the figure: 1-cylinder block, 2-oil pump, 3-mounting surface, 301-first chamfer, 4-seal plane, 401-second chamfer, 5-third chamfer.

Detailed ways

The specific embodiments of the present invention will be described in detail below in conjunction with the drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

Example 1:

A high-precision mounting hole structure, arranged on the cylinder block 1, for mounting cylindrical components, including a mounting surface 3 that matches the outer ring surface of the cylindrical component to form an inner ring surface structure, and is located at the inner end of the mounting surface 3 One side of the sealing plane 4, the sealing plane 4 is used to seal and fit the front end of the cylindrical component, the inner edge of the mounting surface 3 is provided with a first chamfer 301, and the edge of the sealing plane 4 is provided with a second inverted Angle 401, the first chamfer 301 and the second chamfer 401 are connected, and the joint of the first chamfer 301 and the second chamfer 401 is a shoulder structure.

In the processing of the high-precision mounting hole structure of the present invention, the first chamfer 301 and the second chamfer 401 are respectively processed on the processing bottom surfaces of the mounting surface 3 and the sealing plane 4, respectively. Then, the processing bottom surfaces of the mounting surface 3 and the sealing surface 4 are respectively processed to control the range of the respective handover marks and the depth of the handover marks respectively, so as to realize the separate processing of the sealing plane 4 and the mounting surface 3 while ensuring relative accuracy. It will not make the transfer marks affect the function of the cylindrical part.

Example 2:

As shown in Figures 3 and 4, a high-precision mounting hole structure is integrally formed and arranged on the cylinder block 1. The cylindrical part is the oil pump 2. The high-precision mounting hole structure is used to install the oil pump 2. It includes a mounting surface 3 that matches the outer ring surface of the oil pump 2 to form an inner ring surface structure, and a sealing plane 4 located on the inner end side of the mounting surface 3, and the sealing surface 4 is used for sealingly matching the front end of the oil pump 2, The inner edge of the mounting surface 3 is provided with a first chamfer 301, the edge of the sealing plane 4 is provided with a second chamfer 401, the first chamfer 301 and the second chamfer 401 are connected, the first The joint of the chamfer 301 and the second chamfer 401 is a shoulder structure, that is, the first chamfer 301 and the second chamfer 401 are steps, forming a shoulder, which avoids the mounting surface 3 and The sealing plane 4 is directly connected, that is, there is a certain distance between the inner end of the mounting surface 3 and the sealing plane 4.

Both the first chamfer 301 and the second chamfer 401 are rounded corners;

The front end of the oil pump 2 is provided with an introduction angle. The front end of the oil pump 2 is provided with an lead-in angle, which can avoid the shoulder formed by the first chamfer 301 and the second chamfer 401 structure.

As shown in Figure 4, in the processing of the high-precision mounting hole structure of the present invention, two fillets are first processed on the processing bottom surface of the mounting surface 3 and the sealing plane 4 respectively, and then two fillets are processed separately The processing bottom surface of the mounting surface 3 and the sealing surface 4 respectively control the range of the respective handover marks and the depth of the handover marks, so as to realize the separate processing of the sealing plane 4 and the mounting surface 3 to ensure relative accuracy while not making the handover The mark affects the function of the oil pump 2.

Example 3:

As shown in FIG. 5, the difference between this embodiment and the foregoing embodiment 2 is that the cylindrical part is an idler gear shaft, the first chamfer 301 and the second chamfer 401 are both oblique angles, and the oblique angle The angle with the horizontal plane is 45°.

Example 4:

As shown in FIG. 6, the difference between this embodiment and the foregoing embodiment 2 is that a third chamfer 5 is also provided between the first chamfer 301 and the second chamfer 401, and the number of shoulders is two. One, the first chamfer 301, the second chamfer 401 and the third chamfer 5 are all rounded corners.

Claims

A high-precision mounting hole structure is arranged on a cylinder block (1) for mounting a cylindrical component, and includes a mounting surface (3) that cooperates with the outer ring surface of the cylindrical component to form an inner ring surface structure, and is located on the mounting surface The sealing plane (4) on the inner end side of (3), the sealing plane (4) is used to seal and fit the front end of the cylindrical component, characterized in that: the inner edge of the mounting surface (3) is provided with a A chamfer (301), a second chamfer (401) is provided on the edge of the sealing plane (4), the first chamfer (301) and the second chamfer (401) are connected, the first The joint of the chamfer (301) and the second chamfer (401) is a shoulder structure.
The high-precision mounting hole structure according to claim 1, characterized in that it further comprises a third chamfer (5) located between the first chamfer (301) and the second chamfer (401). ), the third chamfer (5) is more than one.
The high-precision mounting hole structure according to claim 1, characterized in that: the first chamfer (301) is one of a rounded corner or a beveled corner, and the second chamfered corner (401) is a rounded corner. One of angle or bevel.
The high-precision mounting hole structure according to claim 1, wherein the front end of the cylindrical component is provided with an introduction angle.
The high-precision mounting hole structure according to claim 1, wherein the cylindrical part is an oil pump (2).
The high-precision mounting hole structure according to claim 1, wherein the high-precision mounting hole structure is integrally formed and arranged on the cylinder block (1).