Mounting device and mounting method for shaft hole interference fit

Abstract

The invention discloses a shaft hole interference fit mounting device and method, and belongs to the technical field of gear boxes. The shaft hole interference fit mounting device is used for mounting a shaft piece and a hole piece, and the shaft piece is provided with a first shaft part and a second shaft part; the hole piece is provided with a mounting hole and a first oil injection hole which are communicated with each other, the first shaft part is sleeved with the hole piece through the mounting hole, the hole piece is in interference fit with the first shaft part, the shape of the mounting hole is matched with that of the first shaft part, and the first oil injection hole is used for injecting pressure oil into the mounting hole; the mounting device comprises an oil cylinder and a piston, the oil cylinder is arranged on the second shaft part, the oil cylinder is provided with an oil cavity and a connecting part and a second oil injection hole which are communicated with the oil cavity, and the second oil injection hole is used for injecting pressure oil into the oil cavity; one end of the piston is movably connected to the connecting part, pressure oil in the oil cavity can enable the piston to move and enable the other end of the piston to abut against the end face of the hole piece, correct installation of interference fit of the shaft hole is guaranteed, the shafting length does not need to be considered, the application range is wide, and installation is easy.

Description

Technical Field

[0001] The present invention relates to the technical field of gear boxes, and in particular to an installation device and an installation method for shaft hole interference fit. Background Art

[0002] like Figure 1 As shown, the existing shaft hole interference fit installation structure, such as the gear 100 and the rotating shaft 200 are interference fit, the end of the rotating shaft 200 is installed with a baffle 300, and the baffle 300 is provided with a jack 400. The jack 400 is extended when working, thereby pushing the end face of the gear 100 to make the gear 100 move in the X direction, that is, the preset direction, and then completing the interference fit of the rotating shaft 200 and the gear 100. In actual engineering applications, sometimes a relatively long rotating shaft 200 is encountered, and the distance between the interference fit gear 100 and the end face of the rotating shaft 200 is relatively far. However, due to the size limitation of the jack 400, when the distance between the end of the rotating shaft 200 and the end face of the gear 100 exceeds the total length of the jack 400, it is difficult to achieve assembly. Summary of the invention

[0003] The purpose of the present invention is to provide an installation device and an installation method for shaft hole interference fit, which ensures the correct installation of the shaft hole interference fit without considering the shaft system length, has a wide range of adaptability and is simple to install.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] An installation device for shaft-hole interference fit, used for installing a shaft member and a hole member, wherein the shaft member is provided with a first shaft portion and a second shaft portion;

[0006] The hole member is provided with a mounting hole and a first oil injection hole which are interconnected, the hole member is sleeved on the first shaft portion through the mounting hole, and the hole member and the first shaft portion are interference fit, the shape of the mounting hole is adapted to the shape of the first shaft portion, and the first oil injection hole is used to inject pressurized oil into the mounting hole;

[0007] The installation device includes:

[0008] An oil cylinder is provided on the second shaft portion, the oil cylinder is provided with an oil chamber and a connecting portion and a second oil injection hole respectively communicated with the oil chamber, the second oil injection hole is used to inject pressure oil into the oil chamber;

[0009] One end of the piston is movably connected to the connecting portion, and the pressure oil in the oil chamber can move the piston and make the other end of the piston push against the end surface of the orifice.

[0010] In some possible implementations, the piston is at least partially annular, and the annular structure is used to push against the end surface of the hole member, and the piston is sleeved on the shaft member.

[0011] In some possible implementations, the piston is annular, the oil chamber is annular, and the shape of the piston, the shape of the oil chamber, and the shape of the connecting portion are compatible.

[0012] In some possible implementations, the second oil filling hole is connected to a side of the oil chamber away from the piston, and a diameter of the second oil filling hole is smaller than a difference between an inner ring radius and an outer ring radius of the oil chamber.

[0013] In some possible implementations, the second shaft portion is provided with a plurality of installation positions along the axial direction, and the oil cylinder can be selectively installed at one of the installation positions.

[0014] In some possible implementations, the oil cylinder is provided with a threaded hole, the second shaft portion is provided with an external thread matched with the threaded hole, and the oil cylinder and the second shaft portion are threadedly connected via the threaded hole and the external thread.

[0015] In some possible embodiments, the second oil filling hole includes a first hole portion and a second hole portion which are arranged at an angle, the second hole portion is connected to the oil chamber, the aperture of the second hole portion is smaller than the aperture of the first hole portion, and the orifice of the first hole portion is arranged on the peripheral side of the oil cylinder.

[0016] In some possible implementations, a mounting groove is formed on the end surface of the orifice member, and the opening of the first oil filling hole is disposed on a groove wall of the mounting groove.

[0017] In some possible implementations, the first shaft portion has a taper, and the second shaft portion is close to a small-diameter end of the first shaft portion.

[0018] A method for installing a shaft hole interference fit, using the above-mentioned shaft hole interference fit installation device for installation, comprising:

[0019] The orifice is installed at the initial position of the first shaft portion, the piston is installed on the oil cylinder, and the oil cylinder is installed on the second shaft portion;

[0020] At the same time, pressurized oil is injected into the first oil injection hole and the second oil injection hole, so that a radial gap is generated between the hole wall of the mounting hole and the first shaft portion under the action of the pressurized oil; the piston moves toward the hole member under the action of the pressurized oil and pushes the hole member to move from an initial position to a preset position.

[0021] Beneficial effects of the present invention:

[0022] The present invention provides an installation device and installation method for interference fit of a shaft hole. By injecting pressurized oil into the first oil filling hole, a radial gap is generated between the hole wall of the installation hole and the first shaft portion, so as to facilitate forward and backward movement. By injecting pressurized oil into the second oil filling hole to make it enter the oil chamber, the pressurized oil in the oil chamber can move the piston toward the hole member, and push against the end face of the hole member to move it to a preset position, thereby completing the installation of the interference fit. The connection between the piston and the hole member is achieved by arranging a second shaft portion connected to the oil cylinder on the shaft member. Specifically, the position of the second shaft portion can be set according to actual conditions, the spacing distance between the first shaft portion and the second shaft portion can be reduced, and the distance between the piston and the hole member can be reduced, so that the installation of the interference fit can be completed within a shorter distance. Alternatively, the length of the piston can be appropriately increased. The overall axial dimension of the structure is small, and even if the installation distance is long, the interference connection can be correctly installed, without considering the length of the shaft system, with a wide range of adaptability and simple installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a partial schematic diagram of a mounting device for interference fit of a shaft hole in the prior art;

[0024] Figure 2 It is a partial schematic diagram of a mounting device for interference fit of a shaft hole provided in a specific embodiment of the present invention;

[0025] Figure 3 It is a flow chart of a method for installing a shaft hole interference fit provided by a specific embodiment of the present invention.

[0026] In the figure:

[0027] 100, gear; 200, shaft; 300, baffle; 400, jack;

[0028] 1. shaft member; 11. first shaft portion; 12. second shaft portion;

[0029] 2. hole piece; 21. mounting hole; 22. first oil filling hole; 23. mounting groove;

[0030] 3. Oil cylinder; 31. Oil chamber; 32. Second oil injection hole; 321. First hole portion; 322. Second hole portion;

[0031] 4. Piston; 5. Seal; 6. First oiling nozzle; 7. Second oiling nozzle. DETAILED DESCRIPTION

[0032] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] like Figure 2 As shown, this embodiment provides a shaft hole interference fit installation device, the shaft hole interference fit structure includes a shaft member 1 and a hole member 2, and the installation device is used to install the shaft member 1 and the hole member 2. Exemplarily, the hole member 2 is a gear, the shaft member 1 is a rotating shaft, and the gear is installed on the rotating shaft. The installation device includes an oil cylinder 3 and a piston 4. The shaft member 1 is provided with a first shaft portion 11 and a second shaft portion 12. The hole member 2 is provided with a mounting hole 21 and a first oil injection hole 22 that are connected to each other. The hole member 2 is sleeved on the first shaft portion 11 through the mounting hole 21, and the hole member 2 and the first shaft portion 11 are interference fit. The shape of the mounting hole 21 is adapted to the shape of the first shaft portion 11, and the first oil injection hole 22 is used to inject pressure oil into the mounting hole 21. The oil cylinder 3 is provided on the second shaft portion 12, and the oil cylinder 3 is provided with an oil chamber 31 and a connecting portion and a second oil injection hole 32 that are respectively connected to the oil chamber 31, and the second oil injection hole 32 is used to inject pressure oil into the oil chamber 31. One end of the piston 4 is movably connected to the connecting portion, and the pressure oil in the oil chamber 31 can move the piston 4 and make the other end of the piston 4 push against the end surface of the orifice 2 .

[0036] By injecting pressure oil into the first oil injection hole 22, a radial gap is generated between the hole wall of the mounting hole 21 and the first shaft portion 11, so as to facilitate forward and backward movement. By injecting pressure oil into the second oil injection hole 32 to make it enter the oil chamber 31, the pressure oil in the oil chamber 31 can make the piston 4 move toward the hole member 2, and push against the end surface of the hole member 2 to move it to a preset position, thereby completing the installation of interference fit. By setting the second shaft portion 12 connected to the oil cylinder 3 on the shaft member 1, the connection between the piston 4 and the hole member 2 is realized. Specifically, the position of the second shaft portion 12 can be set according to actual conditions to reduce the spacing distance between the first shaft portion 11 and the second shaft portion 12. For example, there is no spacing between the first shaft portion 11 and the second shaft portion 12, reducing the distance between the piston 4 and the hole member 2, so that the installation of interference fit can be completed within a shorter distance. Alternatively, the length of the piston 4 can be appropriately increased. The overall axial size of the structure is small. Even if the installation distance is long, the correct installation of the shaft hole interference fit can be guaranteed, without considering the length of the shaft system, with a wide range of adaptability and simple installation.

[0037] The first shaft portion 11 has a taper, the second shaft portion 12 is close to the small diameter end of the first shaft portion 11, the cylinder 3 faces the small diameter end of the first shaft portion 11, and the piston 4 pushes the end surface of the hole member 2 along the X direction. The X direction is along the axial direction of the shaft member 1, pointing from the small diameter end to the large diameter end. The above-mentioned installation device improves the efficiency of the tapered interference installation.

[0038] The piston 4 is at least partially annular, and the annular structure is used to push the end surface of the hole member 2. The piston 4 is sleeved on the shaft member 1, and the annular surface of the annular structure contacts the hole member 2, ensuring that the piston 4 applies a uniform pressing force to the hole member 2. Compared with the prior art, it is difficult to ensure that a uniform pressing force can be applied to the gear even if multiple jacks are used. Especially when the interference between the hole member 2 and the shaft member 1 is relatively large, a uniform pressing force is more required to ensure the effectiveness of the assembly.

[0039] The piston 4 is annular, and the oil chamber 31 is annular. The shapes of the piston 4, the oil chamber 31 and the connecting portion are matched, so that the pressure oil contacts the piston 4 evenly, so that the piston 4 receives a uniform force, further ensuring that the piston 4 applies a uniform pressing force to the orifice 2.

[0040] The second oil filling hole 32 is connected to the side of the oil chamber 31 away from the piston 4, and the aperture of the second oil filling hole 32 is smaller than the difference between the inner ring radius and the outer ring radius of the oil chamber 31, so that the pressurized oil can be smoothly injected into the oil chamber 31 through the second oil filling hole 32, thereby avoiding the pressurized oil acting on the piston 4 instantly when the second oil filling hole 32 is initially injected with the pressurized oil, causing the piston 4 to be unevenly stressed or impacted, thereby affecting the use effect and service life.

[0041] The second oil injection hole 32 includes a first hole portion 321 and a second hole portion 322 arranged at an angle, the second hole portion 322 is connected to the oil chamber 31, the aperture of the second hole portion 322 is smaller than the aperture of the first hole portion 321, and the orifice of the first hole portion 321 is arranged on the peripheral side of the oil cylinder 3, so as to facilitate the injection of external pressure oil into the second oil injection hole 32 and avoid leakage during the injection process, and the orifice is arranged on the peripheral side for easy operation. The first hole portion 321 and the second hole portion 322 can be arranged at a right angle to further slow down the speed of pressure oil injection into the oil chamber 31.

[0042] The end surface of the orifice member 2 is provided with a mounting groove 23, and the opening of the first oil injection hole 22 is provided on the groove wall of the mounting groove 23, which reduces the length of the first oil injection hole 22, can accelerate the pressure oil to enter the mounting hole 21 through the first oil injection hole 22, shorten the distance of the pressure oil, and facilitate processing. The first oil injection hole 22 is a straight hole, and the center line of the first oil injection hole 22 is set at an angle with the center line of the mounting hole 21, which reduces the length of the first oil injection hole 22.

[0043] The second shaft portion 12 is provided with a plurality of mounting positions along the axial direction, and the oil cylinder 3 can be selectively installed in one of the mounting positions. The mounting position is selected specifically according to the length of the piston 4 and the distance between the mounting position and the end face of the hole member 2, so as to ensure that the piston 4 can push the hole member 2 after the oil cylinder 3 is installed. The oil cylinder 3 and the second shaft portion 12 are threadedly connected, which is convenient for disassembly and assembly. The oil cylinder 3 is provided with a threaded hole, and the second shaft portion 12 is provided with an external thread matched with the threaded hole. The oil cylinder 3 and the second shaft portion 12 are threadedly connected through the threaded hole and the external thread, which is convenient for disassembly and suitable for batch installation. Moreover, the oil cylinder 3 can be screwed to a suitable position according to the needs, and multiple continuous mounting positions are realized on the second shaft portion 12 through the external thread, which has strong applicability.

[0044] Specifically, the connecting portion is an annular hole, and the piston 4 is connected to the annular hole through a sliding sleeve, so as to realize the movable connection between the piston 4 and the oil cylinder 3. A sealing member 5 such as a sealing ring is provided between the piston 4 and the connecting portion, so as to realize the sealed connection and prevent the leakage of the pressure oil. The connection method between the piston 4 and the oil cylinder 3 in the prior art can be specifically referred to, and no further description is given.

[0045] The first oil injection hole 22 is provided with a first oil injection nozzle 6, and the second oil injection hole 32 is provided with a second oil injection nozzle 7 for oil injection. The opening size of the first oil injection hole 22 is adaptively set according to the outer dimensions of the first oil injection nozzle 6, and the opening size of the second oil injection hole 32 is adaptively set according to the outer dimensions of the second oil injection nozzle 7, without limitation.

[0046] like Figure 3 As shown, a method for installing a shaft hole interference fit is provided, which uses the above-mentioned shaft hole interference fit installation device for installation, and includes the following steps:

[0047] S1, installing the hole member 2 at the initial position of the first shaft portion 11, installing the piston 4 on the cylinder 3, and the cylinder 3 on the second shaft portion 12;

[0048] S2. Pressurized oil is injected into the first oil injection hole 22 and the second oil injection hole 32 at the same time, so that a radial gap is generated between the hole wall of the mounting hole 21 and the first shaft portion 11 under the action of the pressurized oil; the piston 4 moves toward the hole member 2 under the action of the pressurized oil, and pushes the hole member 2 to move from the initial position to the preset position.

[0049] Through the above installation method, the installation of shaft hole interference fit is achieved.

[0050] Furthermore, when the second shaft portion 12 is provided with a plurality of installation positions, step S1 further includes: selecting one of the installation positions to install the oil cylinder 3 according to the size of the piston 4 to ensure that the piston 4 can be pushed against the hole member 2 .

[0051] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. 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 embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A shaft-hole interference fit installation device, used for installing a shaft member (1) and a hole member (2), characterized in that: The shaft member (1) is provided with a first shaft portion (11) and a second shaft portion (12); the hole member (2) is provided with a mounting hole (21) and a first oil injection hole (22) which are interconnected; the hole member (2) is sleeved on the first shaft portion (11) through the mounting hole (21); the hole member (2) and the first shaft portion (11) are interference fit; the shape of the mounting hole (21) is adapted to the shape of the first shaft portion (11); and the first oil injection hole (22) is used to inject pressurized oil into the mounting hole (21); The installation device includes: An oil cylinder (3) is arranged on the second shaft portion (12), the oil cylinder (3) being provided with an oil chamber (31) and a connecting portion and a second oil injection hole (32) respectively connected to the oil chamber (31), the second oil injection hole (32) being used to inject pressurized oil into the oil chamber (31); One end of the piston (4) is movably connected to the connecting portion, and the pressure oil in the oil chamber (31) can move the piston (4) and cause the other end of the piston (4) to push against the end surface of the orifice (2).

2. The installation device for shaft hole interference fit according to claim 1, characterized in that: The piston (4) is at least partially annular, and the annular structure is used to push against the end surface of the hole member (2). The piston (4) is sleeved on the shaft member (1).

3. The installation device for shaft hole interference fit according to claim 2, characterized in that: The piston (4) is annular, the oil chamber (31) is annular, and the shapes of the piston (4), the oil chamber (31) and the connecting portion are matched.

4. The installation device for shaft hole interference fit according to claim 3, characterized in that: The second oil injection hole (32) is connected to a side of the oil chamber (31) away from the piston (4), and the diameter of the second oil injection hole (32) is smaller than the difference between the inner ring radius and the outer ring radius of the oil chamber (31).

5. The installation device for shaft hole interference fit according to claim 1, characterized in that: The second shaft portion (12) is provided with a plurality of installation positions along the axial direction, and the oil cylinder (3) can be selectively installed at one of the installation positions.

6. The installation device for shaft hole interference fit according to claim 1, characterized in that: The oil cylinder (3) is provided with a threaded hole, the second shaft portion (12) is provided with an external thread matching the threaded hole, and the oil cylinder (3) and the second shaft portion (12) are threadedly connected via the threaded hole and the external thread.

7. The installation device for shaft hole interference fit according to claim 1, characterized in that: The second oil injection hole (32) comprises a first hole portion (321) and a second hole portion (322) which are arranged at an angle, the second hole portion (322) is connected to the oil chamber (31), the hole diameter of the second hole portion (322) is smaller than the hole diameter of the first hole portion (321), and the orifice of the first hole portion (321) is arranged on the peripheral side of the oil cylinder (3).

8. The installation device for shaft hole interference fit according to claim 1, characterized in that: The end surface of the orifice member (2) is provided with a mounting groove (23), and the opening of the first oil injection hole (22) is arranged on the groove wall of the mounting groove (23).

9. The installation device for shaft hole interference fit according to any one of claims 1 to 8, characterized in that: The first shaft portion (11) has a taper, and the second shaft portion (12) is close to the small-diameter end of the first shaft portion (11).

10. A method for installing a shaft hole with interference fit, characterized in that: The installation is performed using the installation device for shaft hole interference fit as described in any one of claims 1 to 9, comprising: The orifice member (2) is installed at the initial position of the first shaft portion (11), the piston (4) is installed on the oil cylinder (3), and the oil cylinder (3) is installed on the second shaft portion (12); Pressurized oil is injected into the first oil injection hole (22) and the second oil injection hole (32) at the same time, so that a radial gap is generated between the hole wall of the mounting hole (21) and the first shaft portion (11) under the action of the pressurized oil; the piston (4) moves toward the hole member (2) under the action of the pressurized oil, and pushes the hole member (2) to move from an initial position to a preset position.

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