Gear assembly structure and gear assembly adjustment mechanism

Abstract

The present application discloses a gear assembly structure and a gear assembly adjustment mechanism, and relates to the technical field of gear assembly. The gear assembly adjustment mechanism of the present application includes a press-fit block, a support foot, and an adjustment ball shaft. The press-fit block has a mounting hole that passes through the press-fit block, and the mounting hole includes a positioning ball hole and a connecting hole that are arranged in a communication manner; the support foot is connected to the press-fit block, and is used to abut against the gear; the adjustment ball shaft includes a sphere and a connecting shaft that are connected in sequence, the connecting shaft is used to be connected to the gear shaft, and the sphere is used to match the positioning ball hole; wherein the connecting shaft is passed through the connecting hole, and the sphere stays in the positioning ball hole. Therefore, the present application can eliminate the precision error through the mutual cooperation of the gear assembly structure and the gear assembly adjustment mechanism, as well as the self-aligning function of the adjustment ball shaft, improve the initial assembly accuracy of the gear and the gear shaft, realize the one-time assembly of the gear and the gear shaft, avoid the subsequent disassembly and reassembly of the gear and the gear shaft that do not meet the assembly accuracy, and reduce the processing cost.

Description

Technical Field

[0001] The present application relates to the technical field of gear assembly, and in particular to a gear assembly structure and a gear assembly adjustment mechanism. Background Art

[0002] In the gear assembly, the large gear and the gear shaft are usually assembled by interference fit through the method of baking sleeve. Especially in the rail transit subway gearbox, the intermediate shaft system generally adopts the method of baking sleeve to assemble the gear in order to better transmit the torque.

[0003] During the sleeve drying process, when the required interference fit is large, the gear shaft needs to be frozen while the large gear is heated, so as to achieve the interference fit between the large gear and the gear shaft through thermal expansion and contraction.

[0004] In the prior art, after the large gear is heated and the frozen gear shaft is assembled, the large gear and the gear shaft need to be placed in a room temperature environment for a period of time. At this time, due to the principle of thermal expansion and contraction, the large gear will shrink, and the axial shrinkage direction is unknown. There may be a gap between the mating surfaces of the large gear and the gear shaft. At the same time, the mating surface of the large gear and the gear shaft may be tilted, resulting in the large gear and the gear shaft failing to achieve assembly accuracy and needing to be disassembled and reassembled, which has high processing costs. Summary of the invention

[0005] The purpose of the present application is to provide a gear assembly structure and a gear assembly adjustment mechanism, which can improve the initial assembly accuracy of gears and gear shafts.

[0006] The embodiment of the present application is implemented as follows:

[0007] A gear assembly structure comprises a gear shaft and a gear. The outer surface of the gear shaft is provided with a protrusion, and the protrusion and the outer surface of the gear shaft form a step surface. The gear sleeve is arranged outside the gear shaft and abuts against the step surface.

[0008] In one embodiment, a positioning hole is formed on the end surface of the gear shaft.

[0009] In one embodiment, an internal thread is provided on the inner wall of the positioning hole, and a positioning groove is provided at the top of the positioning hole.

[0010] In one embodiment, two positioning holes are provided, which are respectively opened at two ends of the gear shaft.

[0011] A gear assembly adjustment mechanism is used in conjunction with the above-mentioned gear assembly structure, and the gear assembly adjustment mechanism includes a press-fit block, a support foot, and an adjustment ball shaft. The press-fit block has a mounting hole that passes through the press-fit block, and the mounting hole includes a positioning ball hole and a connecting hole that are arranged in communication; the support foot is connected to the press-fit block, and the support foot is used to abut against the gear; the adjustment ball shaft includes a ball and a connecting shaft that are connected in sequence, and the connecting shaft is used to connect to the gear shaft, and the ball is used to match the positioning ball hole; wherein the connecting shaft is inserted into the connecting hole, and the ball stays in the positioning ball hole.

[0012] In one embodiment, the support foot is a cylindrical structure, the support foot has an inner hole, and the maximum diameter of the inner hole is smaller than the outer diameter of the step surface.

[0013] In one embodiment, the gear assembly adjustment mechanism includes an adjustment rod, which is connected to the ball and is used to adjust the adjustment ball axis.

[0014] In one embodiment, an external thread is provided on the outer surface of the connecting shaft; the adjusting rod is detachably connected to the ball body to rotate the adjusting ball shaft.

[0015] In one embodiment, a fixing hole is provided on the sphere, and a fixing protrusion matching the fixing hole is provided at the end of the adjusting rod, and the adjusting rod is connected to the sphere via the fixing protrusion and the fixing hole.

[0016] In one embodiment, a fixing protrusion is provided on the sphere, and a fixing hole matching with the fixing protrusion is provided at the end of the adjusting rod, and the adjusting rod is connected to the sphere via the fixing protrusion and the fixing hole.

[0017] In one embodiment, at least one observation hole is provided on the press-fitting block, and the observation hole passes through the press-fitting block and is located outside the mounting hole.

[0018] In one embodiment, the observation holes are provided in plurality and are distributed in a circular array around the axis of the mounting hole.

[0019] In one embodiment, a magnifying glass is provided in the observation hole.

[0020] In one embodiment, the gear assembly adjustment mechanism includes a spring, which is sleeved outside the connecting shaft, one end of the spring is against or connected to the press-fit block, and the other end is against the gear shaft.

[0021] The beneficial effects of the present application compared with the prior art are as follows: the present application can cooperate with the gear assembly structure and the gear assembly adjustment mechanism, and apply continuous axial force to the gear through the support feet to make the inner hole surface of the gear and the outer surface of the gear shaft always close during the contraction process, and automatically align the center through the ball and the positioning ball hole, and can eliminate precision errors, and make the inner hole surface of the gear and the outer surface of the gear shaft always close, thereby improving the initial assembly accuracy of the gear and the gear shaft, achieving the one-time assembly of the gear and the gear shaft, avoiding the subsequent disassembly and reassembly of the gear and the gear shaft that do not meet the assembly accuracy, and reducing the processing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 An exploded schematic diagram of a gear assembly structure shown in one embodiment of the present application;

[0024] Figure 2 An exploded schematic diagram of a gear assembly adjustment mechanism according to an embodiment of the present application;

[0025] Figure 3 A partial structural schematic diagram of a gear assembly adjustment mechanism according to an embodiment of the present application;

[0026] Figure 4 A schematic diagram of the structure of a gear assembly structure and a gear assembly adjustment mechanism shown in an embodiment of the present application;

[0027] Figure 5 An embodiment of the present application is shown Figure 4 A-A direction cross-sectional view;

[0028] Figure 6 An embodiment of the present application is shown Figure 4 A-A cross-sectional view.

[0029] Icons: 100 - gear assembly structure; 110 - gear shaft; 110a - shaft surface; 111 - protrusion; 111a - step surface; 112 - positioning hole; 112a - internal thread; 113 - positioning groove; 120 - gear; 120a - internal hole surface; 120b - first end surface; 120c - second end surface; 121 - boss; 200 - gear assembly adjustment mechanism; 210 - press-fit block; 211 - mounting hole; 211a - positioning ball hole; 211b - connecting hole; 212 - observation hole; 213 - magnifying glass; 220 - support foot; 221 - internal hole; 230 - adjustment ball shaft; 231 - ball; 232 - connecting shaft; 232a - external thread; 233 - fixing hole; 240 - adjustment rod; 241 - fixing convex block; 242 - outer sleeve; 250 - spring. DETAILED DESCRIPTION

[0030] The terms “first”, “second”, “third”, etc. are only used for distinguishing descriptions and do not indicate the order of arrangement, nor can they be understood as indicating or implying relative importance.

[0031] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0032] In the description of the present application, it should be noted that the terms "inside", "outside", "left", "right", "up", "down", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the products of the present application are usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0033] In the description of this application, unless otherwise clearly specified and limited, the terms "set", "installed", "connected" and "connected" 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, and it can be the internal connection of two elements.

[0034] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings.

[0035] Please refer to Figure 1, which is an exploded schematic diagram of a gear assembly structure 100 shown in an embodiment of the present application. The gear assembly structure 100 includes a gear shaft 110 and a gear 120. The outer surface of the gear shaft 110 is called the shaft surface 110a. The shaft surface 110a is provided with a protrusion 111. The protrusion 111 can be a shoulder or a gear 120 integrally formed with the gear shaft 110. The two ends of the protrusion 111 respectively form a step surface 111a with the shaft surface 110a. The gear 120 is sleeved outside the gear shaft 110 and abuts against one of the step surfaces 111a.

[0036] A positioning hole 112 is provided on the end surface of the gear shaft 110. The positioning hole 112 is used to assemble the gear adjustment mechanism 200 (see Figure 2 In this embodiment, the inner wall of the positioning hole 112 is provided with an internal thread 112a, and a positioning groove 113 is provided at the top of the positioning hole 112. The positioning groove 113 is a tapered groove, which is convenient for the gear assembly adjustment mechanism 200's connecting shaft 232 (please refer to Figure 5 ) extends into the positioning hole 112.

[0037] There are two positioning holes 112 , which are respectively located at two ends of the gear shaft 110 .

[0038] The inner surface of the through hole in the gear 120 is called the inner hole surface 120a, and the two end surfaces of the gear 120 are respectively the first end surface 120b and the second end surface 120c. In this embodiment, the first end surface 120b is a non-finished end surface. The second end surface 120c is a finished end surface, which is used to abut against the step surface 111a. In this embodiment, a boss 121 is provided on the gear 120, and the first end surface 120b includes the outer surface of the boss 121.

[0039] Please refer to Figure 2 , which is an exploded schematic diagram of a gear assembly adjustment mechanism 200 shown in an embodiment of the present application. The gear assembly adjustment mechanism 200 is used in conjunction with the gear assembly structure 100 of the above embodiment. The gear assembly adjustment mechanism 200 includes a press-fit block 210, a support foot 220 and an adjustment ball shaft 230. The press-fit block 210 has a mounting hole 211 that passes through the press-fit block 210. The mounting hole 211 includes a positioning ball hole 211a and a connecting hole 211b that are arranged in communication with each other. The inner surface of the positioning ball hole 211a is an arc-shaped curved surface, and the connecting hole 211b is opened on the inner surface of the positioning ball hole 211a. The connecting hole 211b can be a truncated cone hole or a cylindrical hole. In this embodiment, the connecting hole 211b is a cylindrical hole, and the maximum aperture of the positioning ball hole 211a is larger than the aperture of the connecting hole 211b. The positioning ball hole 211a and the connecting hole 211b are coaxially arranged.

[0040] The support leg 220 is connected to the press block 210, and the support leg 220 is used to abut against the gear 120; the adjustment ball shaft 230 includes a ball body 231 and a connecting shaft 232 connected in sequence, and the outer surface of the connecting shaft 232 is provided with a thread that is connected to the inner thread 112a (please refer to Figure 1 ) is used to connect with the gear shaft 110, and the outer surface of the ball 231 is an arc-shaped spherical surface, which is used to match the positioning ball hole 211a; wherein, the connecting shaft 232 is inserted into the connecting hole 211b, and the ball 231 stays in the positioning ball hole 211a. The connecting shaft 232 can be a cylindrical or rectangular parallelepiped structure. In this embodiment, the connecting shaft 232 is a cylindrical structure, and the aperture of the connecting hole 211b is larger than the outer diameter of the connecting shaft 232, so that the self-aligning function can be achieved.

[0041] The support leg 220 has an inner hole 221, and the support leg 220 is a cylindrical structure. When the support leg 220 with a cylindrical structure abuts against the gear 120, the first end surface 120b can be evenly stressed to avoid damage to the gear 120. In another embodiment, the support leg 220 is a plurality of support rods, and the plurality of support rods are hinged or fixedly connected to the press-fit block 210 and are distributed in a circumferential array around the axis of the mounting hole 211.

[0042] The gear assembly adjustment mechanism 200 includes an adjustment rod 240, which is detachably connected to the ball 231 and is used to rotate the adjustment ball shaft 230. The ball 231 is provided with a fixing hole 233, and the end of the adjustment rod 240 is provided with a fixing protrusion 241 that matches the fixing hole 233. The adjustment rod 240 is connected to the ball 231 through the fixing protrusion 241 and the fixing hole 233. In this embodiment, the fixing hole 233 is a hexagonal hole, and the fixing protrusion 241 is a hexagonal protrusion, that is, the adjustment rod 240 can be a manual wrench, an electric wrench, or a pneumatic wrench. In another embodiment, the ball 231 is provided with a fixing protrusion 241, and the end of the adjustment rod 240 is provided with a fixing hole 233 that matches the fixing protrusion 241, and the adjustment rod 240 is connected to the ball 231 through the fixing protrusion 241 and the fixing hole 233. In another embodiment, the adjusting rod 240 and the adjusting ball shaft 230 are integrally formed, or fixed together by welding or other methods.

[0043] Please refer to Figure 3 , which is a partial structural diagram of a gear assembly adjustment mechanism 200 shown in an embodiment of the present application. The press block 210 is provided with at least one observation hole 212, which passes through the press block 210 and is located outside the mounting hole 211. The observation hole 212 can be used to reduce the weight of the press block 210 and can also be used to observe and adjust the ball shaft 230 and the gear shaft 110 (please refer to Figure 4 ) to determine whether the connecting shaft 232 is aligned with the positioning hole 112.

[0044] There are a plurality of observation holes 212, which are respectively distributed in a circular array around the axis of the mounting hole 211. In this embodiment, there are three observation holes 212.

[0045] In the embodiment, the support leg 220 may be truncated cone-shaped or cylindrical. In the present embodiment, the support leg 220 is a cylindrical structure, and the outer diameter of the boss 121 is equal to the outer diameter of the support leg 220. In the embodiment, the press block 210 and the support leg 220 may be integrated, or may be fixed together by welding, bolt connection, threaded connection, etc.

[0046] Please refer to Figure 4 , which is a schematic diagram of the structure of a gear assembly structure 100 and a gear assembly adjustment mechanism 200 according to an embodiment of the present application. Figure 5 , which is shown in an embodiment of the present application Figure 4 A-A cross-sectional view.

[0047] In an operation process, the gear 120 is first heated, and whether to freeze the gear shaft is selected according to the interference. The heated gear 120 is inserted into the gear shaft 110, and the inner hole surface 120a is in close contact with the shaft surface 110a, and the second end surface 120c is in close contact with the step surface 111a. Then the gear assembly adjustment mechanism 200 is installed, and the gear 120 and the gear shaft 110 are auxiliary pressed by the gear assembly adjustment mechanism 200.

[0048] During the auxiliary press-fitting process, the support foot 220 is brought into contact with the first end face 120b, and the connecting shaft 232 of the ball shaft 230 is adjusted to pass through the mounting hole 211 and extend into the positioning hole 112. Then, the adjusting rod 240 is connected to the ball 231, and the adjusting rod 240 is rotated so that the connecting shaft 232 is screwed into the positioning hole 112 until the outer surface of the ball 231 contacts the inner surface of the positioning ball hole 211a. At this time, the connecting shaft 232 is continued to be screwed into the positioning hole 112, and the support foot 220 can apply a continuous axial force to the first end face 120b of the gear 120, so that the second end face 120c is always in close contact with the step surface 111a. At the same time, the spherical contact between the outer surface of the ball 231 and the inner surface of the positioning ball hole 211a can achieve automatic centering, thereby eliminating the precision error of the gear assembly adjustment mechanism 200 itself and the size error of the first end face 120b of the gear 120. Finally, when the gear 120 and the gear shaft 110 return to room temperature and achieve interference fit, the gear assembly adjustment mechanism 200 can be removed.

[0049] In the present embodiment, during the thermal expansion and contraction of the gear 120 and the gear shaft 110, the support foot 220 applies a continuous axial force to the gear 120, so that the inner hole surface 120a of the gear 120 and the axial surface 110a of the gear shaft 110 are always in close contact during the contraction process of the gear 120, and the ball 231 and the positioning ball hole 211a are automatically aligned, and the precision error can be eliminated, and the inner hole surface 120a of the gear 120 and the axial surface 110a of the gear shaft 110 are always in close contact, so that the initial assembly accuracy of the gear 120 and the gear shaft 110 can be improved, and the gear 120 and the gear shaft 110 can be assembled in place at one time, avoiding the subsequent disassembly and reassembly of the gear and gear shaft that do not meet the assembly accuracy, thereby reducing the processing cost.

[0050] In the embodiment, the inner hole 221 of the support leg 220 can be a truncated cone hole or a cylindrical hole. When the inner hole 221 of the support leg 220 is a truncated cone hole, its hole diameter increases from top to bottom. When the inner hole 221 of the support leg 220 is a cylindrical hole, the hole diameter of the inner hole 221 of the support leg 220 is equal everywhere, and the maximum hole diameter of the inner hole 221 of the support leg 220 is equal to the hole diameter of the inner hole 221 of the support leg 220.

[0051] Among them, the maximum aperture of the inner hole 221 of the support leg 220 is smaller than the outer diameter of the step surface 111a, so that the second end face 120c is always in close contact with the step surface 111a; the minimum aperture of the inner hole 221 of the support leg 220 is smaller than the maximum outer diameter of the protrusion 111, so that the gear assembly adjustment mechanism 200 can be installed in reverse and the inner hole 221 can accommodate the protrusion 111.

[0052] Please refer to Figure 6 , which is shown in an embodiment of the present application Figure 4 A magnifying glass 213 is provided in the observation hole 212. The setting of the magnifying glass 213 is more conducive to observing and adjusting the ball shaft 230 and the gear shaft 110 (please refer to Figure 4 The adjusting rod 240 is provided with a jacket 242 for holding.

[0053] The gear assembly adjustment mechanism 200 includes a spring 250, which is sleeved outside the connecting shaft 232, one end of the spring 250 abuts against or is connected to the press block 210, and the other end abuts against the gear shaft 110. The spring 250 can be an independent accessory, or a accessory fixed to the press block 210. The setting of the spring 250 can play a buffering role, so that the force of the support leg 220 on the gear 120 is evenly pressed, avoiding damage to the end face of the gear 120 caused by sudden compression.

[0054] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A gear assembly adjustment mechanism, characterized in that: Used in conjunction with a gear assembly structure, the gear assembly structure includes a gear shaft and a gear, a protrusion is provided on the outer surface of the gear shaft, the protrusion and the outer surface of the gear shaft form a step surface, the gear is sleeved outside the gear shaft and abuts against the step surface, and the gear assembly adjustment mechanism includes: A press-fit block having a mounting hole penetrating the press-fit block, wherein the mounting hole comprises a positioning ball hole and a connecting hole which are arranged in communication with each other, and the press-fit block is provided with at least one observation hole which penetrates the press-fit block and is located outside the mounting hole; A support foot connected to the press-fit block, the support foot is used to abut against the gear, and the support foot is a cylindrical structure, the support foot has an inner hole, and the maximum hole diameter of the inner hole is smaller than the outer diameter of the step surface; and An adjusting ball shaft comprises a sphere and a connecting shaft connected in sequence, wherein the connecting shaft is used to be connected to the gear shaft, and the sphere is used to match the positioning ball hole; An adjusting rod, connected to the spherical body, and used for adjusting the adjusting spherical axis; The outer surface of the connecting shaft is provided with an external thread, and the adjusting rod is detachably connected to the ball body for rotating the adjusting ball shaft; Wherein, the connecting shaft is inserted into the connecting hole, and the ball stays in the positioning ball hole.

2. The gear assembly adjustment mechanism according to claim 1, characterized in that: A magnifying glass is arranged in the observation hole.

3. The gear assembly adjustment mechanism according to any one of claims 1 to 2, characterized in that: include: A spring is sleeved outside the connecting shaft, one end of the spring is against or connected to the press-fit block, and the other end is against the gear shaft.

4. The gear assembly adjustment mechanism according to claim 1, characterized in that: A positioning hole is provided on the end surface of the gear shaft.

5. The gear assembly adjustment mechanism according to claim 4, characterized in that: An internal thread is provided on the inner wall of the positioning hole, and a positioning groove is provided at the top of the positioning hole; There are two positioning holes, which are respectively opened at two ends of the gear shaft.

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