Axial positioning structure and engine

Abstract

An axial positioning structure and an engine, the axial positioning structure comprises a gear shaft with a polished shaft and a box body, the box body is provided with a gear shaft hole provided with a bearing, and the polished shaft of the gear shaft is inserted into the bearing and is in running fit with the box body. The gear shaft is characterized in that a first metal gasket, a nylon gasket and a second metal gasket are sequentially arranged on the optical axis of the gear shaft in the direction close to the box body. According to the utility model, the plurality of gaskets are adopted, and the nylon gasket is arranged between the two metal gaskets, so that the friction force between the two gaskets can be reduced due to the characteristics of the nylon gasket, and the speed transmitted to the metal gaskets at the box body end is reduced; the abrasion between the gasket and the end face of the box body is reduced, the increase of a gap between the shaft and the box body is avoided, abnormal sound is avoided, and meanwhile, the shaft clamping stagnation phenomenon is also avoided.

Description

Technical Field

[0001] The utility model relates to a rotating shaft gasket technology, in particular to an axial positioning structure and an engine. Background Art

[0002] In conventional designs, a single metal gasket structure is used at the shaft end to ensure the clearance adjustment between the shaft and the housing. Since the three mating parts, the shaft, gasket and housing are all metal parts, a gap is designed between the inner hole of the gasket and the shaft to ensure normal rotation of the shaft during the design process. Gaps are designed between the housing and the gasket, and between the gasket and the shaft end. However, during the rotation of the shaft, due to the radial and axial forces and the viscosity of the oil on the gasket surface, one end of the gasket will stick to the end face of the shaft and rotate at high speed with the shaft. At the same time, under the action of the axial force, it will continuously contact and wear the end face of the housing. Since the metal gasket and the end face of the housing will continuously wear each other, the fitting clearance increases, which leads to problems such as abnormal noise.

[0003] The current solution is to optimize the gasket size during design, reduce the design gap, add coating technology to the gasket surface, etc. to make limited optimization improvements. Aftermarket parts solve the problem by repeatedly disassembling and replacing gaskets, which leads to high product design, manufacturing, and maintenance costs, and does not meet the requirements of product design to reduce costs and increase efficiency. Summary of the invention

[0004] The purpose of the utility model is to provide an axial positioning structure, which can effectively improve the problem of abnormal noise caused by excessive gap due to axial wear, ensure the functionality of the components, extend the service life of the product and save product costs.

[0005] The present invention provides an axial positioning structure, comprising a gear shaft with an optical axis and a housing, wherein a bearing mounting hole for mounting the gear shaft is arranged on the housing, the optical axis of the gear shaft is inserted into the bearing and rotated with the housing, and a first metal gasket, a nylon gasket and a second metal gasket are arranged in sequence on the optical axis of the gear shaft along the direction close to the housing. The structure adopts a design scheme of arranging two metal gaskets and arranging a nylon gasket between the two metal gaskets, and a combination of gaskets of different materials, and utilizes different friction coefficients and hardnesses between different materials to form an effective functional combination to solve the design problem. In the case of high-speed rotation of the shaft, the small friction coefficient of the nylon material is utilized to effectively reduce or delay the common rotation between different gaskets, ensure that the gasket close to the housing end rotates at a low speed or is approximately non-rotating, and effectively reduce the wear of the gasket and the end face of the housing, and at the same time, the thermal expansion and self-lubricating characteristics of the nylon material are utilized, and in the case of continuous friction and temperature rise between the gaskets, the axial clearance is self-adjusted by the thermal expansion of the nylon material, thereby effectively avoiding the occurrence of abnormal noise and other faults, and also ensuring that the shaft jamming phenomenon will not occur.

[0006] Further: the mating end faces of the metal gasket and the nylon gasket are provided with a plurality of protrusions. By providing a plurality of protrusions on the metal gasket, the contact area between the end face of the metal gasket and the nylon gasket can be reduced, and the friction between the metal gasket and the nylon gasket can be reduced, thereby further reducing the rotation speed of the nylon gasket, thereby reducing the rotation with the box end, reducing the wear of the metal gasket and the box end, and thus extending the service life.

[0007] Further: the end surface of the nylon gasket is provided with a plurality of nylon protrusions. By providing the nylon protrusions on the nylon gasket, the contact area with the end surface of the metal gasket is also achieved. Due to the characteristics of the nylon gasket, the rotation speed of the metal gasket can also be transmitted to the nylon gasket at a lower speed, which can further reduce the relative rotation between the gasket and the box end, and reduce the wear between the box and the gasket.

[0008] Further: a plurality of nylon protrusions are provided on both end surfaces of the nylon gasket. The protrusions are provided on both ends of the nylon, so that the friction between the metal gasket and the nylon gasket can be further reduced, so that the speed transmitted to the nylon gasket is lower, and the relative speed between the metal gasket and the end of the box is smaller or almost non-rotating, thereby reducing the wear of the gasket and the end surface of the box, and also reducing the occurrence of abnormal noise.

[0009] Further: a plurality of convex points are arranged on the end surface where the metal gasket contacts the nylon gasket, and a plurality of nylon convex points corresponding to the convex points arranged on the metal gasket are arranged on the nylon gasket. By arranging convex points on the contact end surfaces of the metal gasket and the nylon gasket and the convex points correspond to each other, the contact area between the two is smaller, thereby making the friction smaller, further reducing the speed transmission, and also reducing the wear of the gasket and the end surface of the box.

[0010] The utility model also provides an engine, on which the axial positioning structure as described above is installed. In the engine equipped with the structure, during high-speed rotation, when the metal gasket is transferred to the nylon gasket, due to the characteristics of the nylon gasket, which has a small friction coefficient and self-lubricating properties, the rotation speed of the nylon gasket will be greatly reduced, so that the rotation speed of the metal gasket transferred to the end of the box body is low or almost non-rotating, thereby reducing the wear between the gasket and the end face of the box body, ensuring the gap between the shaft and the box body, and effectively avoiding the problem of abnormal noise and the occurrence of shaft jamming.

[0011] Beneficial effects:

[0012] The utility model adopts multiple gaskets and arranges a nylon gasket between two metal gaskets. Due to the characteristics of the nylon gasket, the friction between the two gaskets can be reduced, thereby reducing the speed of the metal gasket transmitted to the end of the box body, reducing the wear between the gasket and the end face of the box body, avoiding the increase of the gap between the shaft and the box body, avoiding the occurrence of abnormal noise, and also avoiding the occurrence of shaft jamming. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of the utility model in which a gasket and a box body are arranged on the shaft;

[0014] Figure 2 This is a schematic diagram of the explosion structure of the gasket of the utility model; Implementation

[0015] The utility model provides an axial positioning structure, including a gear shaft 4 with an optical axis and a housing 1. The optical axis referred to here generally refers to the part of the shaft on which the gear is installed and matched with the housing, or the part on which a groove is opened on the shaft and matched with a bearing arranged on the housing; the gear shaft 4 can be a gear installed on the shaft in a separate structure from the shaft, or an integrated gear structure; gears 5 and 6 of different sizes are installed on the gear shaft, and the root circle diameter of the gear teeth is larger than the diameter of the optical axis. A bearing mounting hole for installing the gear shaft is provided on the housing, the optical axis of the gear shaft 4 is inserted into the bearing 2 and rotated with the housing 1, and a gasket 3 is provided between the shaft and the end face of the housing, and the gasket 3 includes a first metal gasket 31, a nylon gasket 32 ​​and a second metal gasket 33; the first metal gasket 31, a nylon gasket 32 ​​and a second metal gasket 33 are sequentially provided on the optical axis of the gear shaft along the direction close to the housing. This structure sets two metal gaskets and sets a nylon gasket between the two metal gaskets. The design scheme of the combination of gaskets of different materials uses the different friction coefficients and hardnesses between different materials to form an effective functional combination to solve the design problem. In the case of high-speed rotation of the shaft, the low friction coefficient of the nylon material is used to effectively reduce or delay the common rotation between different gaskets, ensuring that the gasket close to the end of the box rotates at a low speed or almost does not rotate, effectively reducing the wear of the gasket and the end face of the box. At the same time, the thermal expansion and self-lubricating characteristics of the nylon material are used. In the case of continuous friction and temperature rise between the gaskets, the axial clearance is self-adjusted through the thermal expansion of the nylon material, thereby effectively avoiding the occurrence of abnormal noise and other faults while ensuring that the shaft will not be stuck.

[0016] In this embodiment: the mating end faces of the metal gasket and the nylon gasket are provided with a plurality of protrusions 7. By providing a plurality of protrusions on the metal gasket, the contact area between the end face of the metal gasket and the nylon gasket can be reduced, and the friction between the metal gasket and the nylon gasket can be reduced, thereby further reducing the rotation speed of the nylon gasket, thereby reducing the rotation with the box end, reducing the wear of the metal gasket and the box end, and thus extending the service life.

[0017] In this embodiment, the end surface of the nylon gasket is provided with a plurality of nylon protrusions 8. By providing the nylon protrusions on the nylon gasket, the contact area with the end surface of the metal gasket is also achieved. Due to the characteristics of the nylon gasket, the rotation speed of the metal gasket can be transmitted to the nylon gasket at a lower speed, which can further reduce the relative rotation between the gasket and the box end, and reduce the wear between the box and the gasket.

[0018] In this embodiment: both end surfaces of the nylon gasket are provided with a plurality of nylon protrusions 8. By providing protrusions at both ends of the nylon, the friction between the metal gasket and the nylon gasket can be further reduced, so that the speed transmitted to the nylon gasket is lower, and the relative speed between the metal gasket and the box end is smaller or almost non-rotating, thereby reducing the wear between the gasket and the box end surface, and also reducing the occurrence of abnormal noise.

[0019] In this embodiment: a plurality of protrusions 7 are arranged on the end surface of the metal gasket in contact with the nylon gasket, and a plurality of nylon protrusions 8 corresponding to the protrusions arranged on the metal gasket are arranged on the nylon gasket. By arranging protrusions on the contact end surfaces of the metal gasket and the nylon gasket and the protrusions corresponding to each other, the contact area between the two is smaller, thereby making the friction smaller, further reducing the speed transmission, and thus reducing the wear of the gasket and the end surface of the box.

[0020] The utility model also provides an engine, on which the axial positioning structure as described above is installed. In the engine equipped with the structure, during high-speed rotation, when the metal gasket is transferred to the nylon gasket, due to the characteristics of the nylon gasket, which has a small friction coefficient and self-lubricating properties, the rotation speed of the nylon gasket will be greatly reduced, so that the rotation speed of the metal gasket transferred to the end of the box body is low or almost non-rotating, thereby reducing the wear between the gasket and the end face of the box body, ensuring the gap between the shaft and the box body, and effectively avoiding the problem of abnormal noise and the occurrence of shaft jamming.

[0021] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. An axial positioning structure, comprising a gear shaft with an optical axis and a housing, wherein a bearing mounting hole for mounting the gear shaft is provided on the housing, and the optical axis of the gear shaft is inserted into the bearing and rotatably matched with the housing, characterized in that: A first metal gasket, a nylon gasket and a second metal gasket are sequentially arranged on the optical axis of the gear shaft in a direction close to the box body.

2. The axial positioning structure according to claim 1, characterized in that: The matching end surfaces of the metal gasket and the nylon gasket are provided with a plurality of convex points.

3. The axial positioning structure according to claim 1, characterized in that: The end surface of the nylon gasket is provided with a plurality of nylon protrusions.

4. The axial positioning structure according to claim 1, characterized in that: Both end surfaces of the nylon gasket are provided with a plurality of nylon protrusions.

5. The axial positioning structure according to claim 1, characterized in that: A plurality of convex points are arranged on the end surface of the metal gasket contacting the nylon gasket, and a plurality of nylon convex points corresponding to the plurality of convex points arranged on the metal gasket are arranged on the nylon gasket.

6. An engine, characterized in that: The engine is mounted with an axial positioning structure as described in any one of claims 1-5.

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