Helical gear axial pressing device

Abstract

The utility model discloses a helical gear axial pressing device which comprises an intermediate transmission gear cover plate, a tapered roller bearing, a bearing baffle, a gear chamber cover and an axial pressing screw which are sequentially arranged outwards from the outer end face of an intermediate transmission gear, and coaxial design structures are arranged at the two ends of the intermediate transmission gear cover plate. The intermediate transmission gear cover plate is attached and fixed to the outer end face of the intermediate transmission gear through a cover plate bolt. The deep groove ball bearing solves the problems that an existing deep groove ball bearing is poor in axial force bearing capacity and not suitable for a bevel gear scheme with large axial force.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to an axial pressing device for helical gears. Background Art

[0002] Compared with spur gears, helical gears have advantages such as good gear meshing, large contact ratio, strong anti-wear ability, and the ability to meet large torque transmission. Therefore, in the traditional engine industry, the design of gears tends to use helical gear solutions more, and thus helical gear solutions are widely used in the engine industry.

[0003] Compared with spur gears, when a spur gear transmits torque, there is only a radial force, while a helical gear will generate a certain axial force during the torque transmission process. Therefore, an additional device needs to be arranged to ensure the axial movement of the helical gear during operation and prevent the helical gear from falling off.

[0004] According to the current axial pressing solutions for helical gears on the market, since most of the axial forces of helical gears are towards the engine block end, the pressing device at the end away from the engine block is a common cover plate plus bolt fixation method. However, when the axial force of the helical gear is away from the engine block, such as for the hydraulic pump gear, a deep groove ball bearing is mainly added at both ends of the gear to meet the installation requirements. However, the deep groove ball bearing has a poor bearing capacity for axial forces and is no longer applicable to helical gear solutions with large axial forces. Summary of the Utility Model

[0005] The purpose of the utility model is to provide an axial pressing device for helical gears, which solves the problem that the existing deep groove ball bearings have a poor bearing capacity for axial forces and are no longer applicable to helical gear solutions with large axial forces.

[0006] To solve the above technical problems, the utility model adopts the following technical solutions:

[0007] An axial pressing device for helical gears includes a middle transmission gear cover plate, a tapered roller bearing, a bearing baffle, a gear chamber cover, and an axial pressing screw, which are sequentially arranged outward from the outer end face of the middle transmission gear. The two ends of the middle transmission gear cover plate have a coaxial design structure, and the middle transmission gear cover plate is fixedly attached to the outer end face of the middle transmission gear through cover plate bolts.

[0008] In this solution, on the one hand, the bearing is changed to a tapered roller bearing. By the axial force bearing capacity of the tapered roller bearing itself, the axial force of the helical gear during operation is overcome, effectively avoiding the axial movement of the helical gear. Secondly, the axial pressing solution of the tapered roller bearing is changed. Through the bearing cover plate and the axial pressing screw, the outer shell, inner ring, and rollers of the tapered roller bearing are pressed tightly, ensuring the reliable operation of the bearing and thus ensuring the reliability of the bearing.

[0009] In this case, the axial pressing scheme of the tapered roller bearing is specifically to axially press the bearing baffle and the tapered roller bearing onto the intermediate transmission gear cover through an axial pressing screw, and utilize the fitting and fixation between the intermediate transmission gear cover and the intermediate transmission gear to overcome the axial force generated during the rotation of the intermediate transmission gear. The gear chamber cover is a cast iron machined part, which mainly provides support and positioning for the outer ring of the tapered roller bearing and the bearing baffle, ensuring that both can move axially stably after receiving the axial force of the axial pressing screw, and at the same time providing a fixed position for the axial pressing screw. There is a coaxial design structure at both ends of the intermediate transmission gear cover, which can ensure the coaxial rotation of the intermediate transmission gear and the tapered roller bearing.

[0010] As a further preference of the present utility model, the intermediate transmission gear is a left-handed helical gear, and the inner end face of the intermediate transmission gear is connected to the engine block through an intermediate transmission gear shaft.

[0011] The intermediate transmission gear is a left-handed helical gear, and when rotating clockwise, its axial force is in the direction away from the engine block.

[0012] As a further preference of the present utility model, the transmission gear shaft is fixed to the engine block through a transmission shaft bolt, and oil channels and oil grooves are reserved by machining.

[0013] The reserved oil channels and oil grooves can lead out the engine oil in the main oil channel of the engine block to cool and lubricate the rotating friction surfaces of the intermediate transmission gear shaft and the intermediate transmission gear, avoiding the burning and jamming of the intermediate transmission gear caused by overheating due to friction. The intermediate transmission gear rotates around the intermediate transmission gear shaft to transmit relevant torques.

[0014] As a further preference of the present utility model, the coaxial design structure at both ends of the intermediate transmission gear cover is specifically that the intermediate transmission gear and the intermediate transmission gear cover are positioned by the way of locating with the stop diameter.

[0015] As a further preference of the present utility model, the inner ring of the tapered roller bearing is pressed onto the bearing installation position of the intermediate transmission gear cover by an interference fit method, and the outer ring of the tapered roller bearing is placed in the corresponding bearing hole of the gear chamber cover by a small clearance fit method.

[0016] The inner ring of the tapered roller bearing being pressed onto the bearing installation position of the intermediate transmission gear cover by an interference fit method can ensure that there is no relative sliding during the rotation process, avoiding overheating and burning of the inner ring of the bearing. The outer ring of the tapered roller bearing being placed in the corresponding bearing hole of the gear chamber cover by a small clearance fit method can ensure that both can move axially smoothly.

[0017] As a further preference of the present utility model, the diameter of the bearing baffle is equivalent to that of the outer ring of the tapered roller bearing.

[0018] It can effectively form a pressing surface.

[0019] As a further preference of the present utility model, the inner end of the axial pressing screw passes through the corresponding threaded hole of the gear chamber cover, and the axial pressing screw is tightened on the gear chamber cover with thread locking glue.

[0020] During installation, the axial pressing screw advances axially through the corresponding threaded hole of the gear chamber cover. After the screw contacts the bearing baffle, the bearing baffle is pushed towards the outer ring of the tapered roller bearing. After the bearing baffle contacts the outer ring of the tapered roller bearing, both are pushed towards the bearing rollers and the inner ring together, ensuring that the housing of the tapered roller bearing is tightly pressed against the inner ring and the rollers, guaranteeing the reliable use of the bearing. By applying thread locking glue on the threads of the threaded hole, it is ensured that the axial pressing screw will not be affected by the reverse acting force, avoiding the loosening of the tapered roller bearing. At the same time, the axial play of the intermediate transmission gear is ensured, avoiding problems such as misaligned meshing and running-in of the gears.

[0021] Compared with the prior art, the present utility model can achieve at least one of the following beneficial effects:

[0022] 1. In this solution, on the one hand, the bearing is changed to a tapered roller bearing. By the axial force bearing capacity of the tapered roller bearing itself, the axial force during the operation of the helical gear is overcome, effectively avoiding the axial play of the helical gear. Second, the axial pressing scheme of the tapered roller bearing is changed. Through the bearing cover plate and the axial pressing screw, the housing of the tapered roller bearing is tightly pressed against the inner ring and the rollers, ensuring the reliable operation of the bearing, and thus ensuring the reliability of the bearing.

[0023] 2. Currently, combined with the 1000h durability test results of the test bench, this solution can completely overcome the axial force of the intermediate transmission gear and ensure the axial play of the intermediate transmission gear.

[0024] 3. The reserved oil passage and oil groove can lead out the engine oil in the main oil passage of the engine block to cool and lubricate the rotating friction surface between the intermediate transmission gear shaft and the intermediate transmission gear, avoiding the burning and jamming of the intermediate transmission gear caused by overheating due to friction. The intermediate transmission gear rotates around the intermediate transmission gear shaft to transmit relevant torques.

[0025] 4. The inner ring of the tapered roller bearing is tightly pressed at the bearing installation position of the intermediate transmission gear cover through an interference fit, which can ensure that there is no relative sliding during rotation, avoiding overheating and burning of the inner ring of the bearing. The outer ring of the tapered roller bearing is placed in the corresponding bearing hole of the gear chamber cover through a small clearance fit, which can ensure that the two can move axially smoothly.

[0026] 5. During installation, the axial compression screw advances axially through the corresponding threaded hole in the gear chamber cover. After the screw contacts the bearing baffle, it pushes the bearing baffle towards the outer ring of the tapered roller bearing. After the bearing baffle contacts the outer ring of the tapered roller bearing, both are pushed towards the bearing rollers and inner ring together, ensuring that the housing of the tapered roller bearing is tightly pressed against the inner ring and rollers, guaranteeing the reliable use of the bearing. By applying thread locking adhesive to the threads of the threaded hole, it is ensured that the axial compression screw will not be affected by reverse acting forces and the loosening of the tapered roller bearing is avoided. At the same time, the axial play of the intermediate transmission gear is ensured to avoid problems such as gear misalignment, meshing, and running-in. Brief Description of the Drawings

[0027] Figure 1 is a schematic structural diagram of the present utility model.

[0028] Figure 2 is a sectional view of the present utility model.

[0029] Figure 3 is a schematic assembly diagram of the transmission gear shaft of the present utility model.

[0030] Figure 4 is a schematic assembly diagram of the intermediate transmission gear shaft and the intermediate transmission gear of the present utility model.

[0031] Figure 5 is a schematic assembly diagram of the transmission gear and the intermediate transmission gear cover plate of the present utility model.

[0032] Figure 6 is a schematic assembly diagram of the transmission gear cover plate and the tapered roller bearing of the present utility model.

[0033] Figure 7 is an exploded view of the tapered roller bearing, the bearing baffle, and the axial compression screw of the present utility model.

[0034] Figure 8 is a schematic assembly diagram of the gear chamber cover and the axial compression screw of the present utility model. Detailed Embodiment

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated herein can be arranged and designed in various different configurations.

[0036] Accordingly, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts fall within the scope of protection of the present invention.

[0037] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other.

[0038] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0039] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0040] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "install", "connect", "couple" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Specific Embodiment 1:

[0042] Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8A helical gear axial pressing device is shown, which includes an intermediate transmission gear cover plate 4, a tapered roller bearing 6, a bearing baffle 7, a gear chamber cover 8, and an axial pressing screw 9 arranged successively outward from the outer end face of the intermediate transmission gear 3. The two ends of the intermediate transmission gear cover plate 4 have a coaxial design structure, and the intermediate transmission gear cover plate 4 is fixedly attached to the outer end face of the intermediate transmission gear 3 through cover plate bolts 5.

[0043] In this solution, on the one hand, the bearing is changed to a tapered roller bearing. By the axial force bearing capacity of the tapered roller bearing itself, the axial force during the operation of the helical gear is overcome, effectively avoiding the axial displacement of the helical gear. Second, the axial pressing scheme of the tapered roller bearing is changed. Through the bearing cover plate and the axial pressing screw, the outer shell, inner ring, and rollers of the tapered roller bearing are pressed tightly, ensuring the reliable operation of the bearing, and thus ensuring the reliability of the bearing.

[0044] Specifically, the axial pressing scheme of the tapered roller bearing in this case is to axially press the bearing baffle and the tapered roller bearing onto the intermediate transmission gear cover plate through the axial pressing screw. By using the fitting and fixation of the intermediate transmission gear cover plate and the intermediate transmission gear, the axial force generated during the rotation of the intermediate transmission gear is overcome. The gear chamber cover is a cast iron machined part, which mainly provides support and positioning for the outer ring of the tapered roller bearing and the bearing baffle, ensuring that both can move axially stably after receiving the axial force of the axial pressing screw, and at the same time providing a fixed position for the axial pressing screw. The two ends of the intermediate transmission gear cover plate have a coaxial design structure, which can ensure the coaxial rotation of the intermediate transmission gear and the tapered roller bearing. Specific Embodiment 2:

[0046] This embodiment further describes the intermediate transmission gear 3 on the basis of Specific Embodiment 1. The intermediate transmission gear 3 is a left-handed helical gear, and the inner end face of the intermediate transmission gear 3 is connected to the engine cylinder block 1 through the intermediate transmission gear shaft 2.

[0047] The intermediate transmission gear is a left-handed helical gear, and when it rotates clockwise, its axial force is in the direction away from the engine cylinder block. Specific Embodiment 3:

[0049] This embodiment further describes the transmission gear shaft 2 on the basis of Specific Embodiment 2. The transmission gear shaft 2 is fixed to the engine cylinder block 1 through transmission shaft bolts and oil channels and oil grooves are reserved by machining.

[0050] The reserved oil channels and oil grooves can lead out the engine oil in the main oil channel of the engine cylinder block to cool and lubricate the rotating friction surfaces of the intermediate transmission gear shaft and the intermediate transmission gear, avoiding the burning and jamming of the intermediate transmission gear caused by overheating due to friction. The intermediate transmission gear rotates around the intermediate transmission gear shaft to transmit relevant torques. Specific Embodiment 4:

[0052] This embodiment further explains the intermediate drive gear cover 4 on the basis of Specific Embodiment 1. The coaxial design structure at both ends of the intermediate drive gear cover 4 is specifically that the intermediate drive gear 3 and the intermediate drive gear cover 4 are positioned by the positioning method of the stop diameter. Specific Embodiment 5:

[0054] This embodiment further explains the tapered roller bearing 6 on the basis of Specific Embodiment 1. The inner ring of the tapered roller bearing 6 is pressed tightly at the bearing installation position of the intermediate drive gear cover 4 by an interference fit method, and the outer ring of the tapered roller bearing 6 is placed in the corresponding bearing hole of the gear chamber cover 8 by a small clearance fit method.

[0055] The inner ring of the tapered roller bearing being pressed tightly at the bearing installation position of the intermediate drive gear cover by an interference fit method can ensure that there is no relative sliding during rotation, avoiding overheating and burning of the inner ring of the bearing due to friction. The outer ring of the tapered roller bearing being placed in the corresponding bearing hole of the gear chamber cover by a small clearance fit method can ensure that the two can move axially smoothly. Specific Embodiment 6:

[0057] This embodiment further explains the bearing baffle 7 on the basis of Specific Embodiment 1. The diameter of the bearing baffle 7 is equivalent to the outer ring of the tapered roller bearing 6.

[0058] It can effectively form a pressing surface. Specific Embodiment 7:

[0060] This embodiment further explains the axial pressing screw 9 on the basis of Specific Embodiment 1. The inner end of the axial pressing screw 9 passes through the corresponding threaded hole of the gear chamber cover 8, and the axial pressing screw 9 is tightened on the gear chamber cover 8 with thread locking glue.

[0061] During installation, the axial pressing screw advances axially through the corresponding threaded hole of the gear chamber cover. After the screw contacts the bearing baffle, the bearing baffle is pushed towards the outer ring of the tapered roller bearing, and after the bearing baffle contacts the outer ring of the tapered roller bearing, the two are pushed together towards the bearing rollers and the inner ring, ensuring that the outer shell of the tapered roller bearing is pressed tightly against the inner ring and the rollers, guaranteeing the reliable use of the bearing. By applying thread locking glue on the threads of the threaded hole, it is ensured that the axial pressing screw will not be affected by the reverse acting force and the tapered roller bearing will not become loose. At the same time, the axial end play of the intermediate drive gear is ensured, avoiding problems such as gear misalignment and meshing and running-in.

[0062] Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A helical gear axial clamping device, characterized in that: The invention comprises an intermediate transmission gear cover plate (4), a tapered roller bearing (6), a bearing baffle plate (7), a gear chamber cover (8) and an axial clamping screw (9) which are arranged outward in sequence from the outer end surface of the intermediate transmission gear (3), wherein both ends of the intermediate transmission gear cover plate (4) have a coaxial design structure, and the intermediate transmission gear cover plate (4) is fixed to the outer end surface of the intermediate transmission gear (3) by means of a cover plate bolt (5).

2. The helical gear axial pressing device according to claim 1, characterized in that: The intermediate transmission gear (3) is a left-handed helical gear, and the inner end surface of the intermediate transmission gear (3) is connected to the engine cylinder body (1) via the intermediate transmission gear shaft (2).

3. The helical gear axial pressing device according to claim 2 is characterized in that: The transmission gear shaft (2) is fixed to the engine cylinder block (1) by means of transmission shaft bolts, and an oil passage and an oil groove are reserved by machining.

4. The helical gear axial pressing device according to claim 1, characterized in that: The coaxial design structure at both ends of the intermediate transmission gear cover plate (4) is specifically that the intermediate transmission gear (3) and the intermediate transmission gear cover plate (4) are positioned by means of stopper diameter positioning.

5. The helical gear axial pressing device according to claim 1, characterized in that: The inner ring of the tapered roller bearing (6) is pressed against the bearing installation position of the intermediate transmission gear cover plate (4) by means of an interference fit, and the outer ring of the tapered roller bearing (6) is placed in the corresponding bearing hole of the gear chamber cover (8) by means of a small clearance fit.

6. The helical gear axial pressing device according to claim 1, characterized in that: The diameter of the bearing baffle (7) is equivalent to the outer ring of the tapered roller bearing (6).

7. The helical gear axial pressing device according to claim 1, characterized in that: The inner end of the axial clamping screw (9) passes through a corresponding threaded hole of the gear chamber cover (8), and the axial clamping screw (9) is fastened to the gear chamber cover (8) by means of a thread locking adhesive.

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