Noise reduction gear with automatic adjustment of mesh side play

Abstract

The application discloses a noise reduction gear capable of automatically adjusting meshing side clearance, comprising a main gear, a first auxiliary gear coaxially connected to one side end surface of the main gear, the main gear and the first auxiliary gear having equal pitch diameter and modulus, a first torsion return element connected between the main gear and the first auxiliary gear, the first auxiliary gear being offset by a certain angle relative to the main gear in a clockwise direction, another side end surface of the main gear coaxially connected to a second auxiliary gear, the main gear and the second auxiliary gear having equal pitch diameter and modulus, a second torsion return element connected between the main gear and the second auxiliary gear, the second auxiliary gear being offset by a certain angle relative to the main gear in an anticlockwise direction; the first auxiliary gear and the second auxiliary gear are matched to reduce the tooth impact when the main gear rotates in the forward and reverse directions, thereby reducing the noise and adapting to the situation that the gear power transmission direction needs to be changed for multiple times.

Description

Technical Field

[0001] This invention relates to the field of gear transmission technology, specifically to a noise-reducing gear that automatically adjusts meshing backlash. Background Technology

[0002] In gear meshing transmission, in order to form a lubricating oil film between the meshing tooth profiles and prevent the gears from seizing due to friction, heat, and expansion, a gap must be left between the tooth profiles. This gap is called tooth flank clearance, or simply backlash.

[0003] In gear transmission, theoretically, there should be no backlash when gears mesh. However, in practice, to compensate for dimensional changes caused by machining and installation errors and temperature variations, and to prevent jamming, a certain amount of tooth flank clearance is left on the non-working surfaces of the gear teeth. Gear transmission mechanisms all have backlash. Backlash is used to prevent gear teeth from jamming due to errors and thermal deformation, and to provide space for the lubricating oil film between the tooth surfaces. The existence of backlash also introduces idle stroke into the transmission mechanism during reverse rotation. Due to the existence of idle stroke, the gear train generates knocking or vibration during operation, producing noise or whistling.

[0004] The existing solution involves adding a secondary gear to one side of the main gear, with a certain offset angle between the secondary gear and the main gear. When the main gear meshes with the drive gear, the teeth of the secondary gear are located between two teeth of the drive gear. At this time, the working surfaces of the teeth of the main gear and the drive gear are in contact, and one side of the tooth surface of the secondary gear is in close contact with the non-working surface of the drive gear. In this way, when the main gear rotates in the opposite direction, the impact between the teeth is reduced due to the buffering effect of the secondary gear, thereby reducing noise. However, the drawback of the above solution is that in actual working conditions, the main gear sometimes needs to change the direction of force transmission multiple times. After the main gear rotates in the opposite direction and then in the forward direction, there will still be impact between the teeth, resulting in greater noise. Summary of the Invention

[0005] The purpose of this invention is to address the problems existing in the prior art by providing a noise-reducing gear that automatically adjusts the meshing backlash. By setting the cooperation between the first and second auxiliary gears, the impact between the teeth can be reduced when the main gear rotates in both forward and reverse directions, thereby reducing noise and adapting to situations where the gear transmission direction needs to be changed multiple times.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A noise-reducing gear with automatic adjustment of meshing backlash includes a main gear, a first auxiliary gear coaxially connected to one end face of the main gear, the pitch circle diameter and module of the main gear and the first auxiliary gear being equal, a first torque reset component connecting the main gear and the first auxiliary gear, the first auxiliary gear being offset from the main gear in a clockwise direction at a certain angle, and a second auxiliary gear coaxially connected to the other end face of the main gear, the pitch circle diameter and module of the main gear and the second auxiliary gear being equal, a second torque reset component connecting the main gear and the second auxiliary gear, the second auxiliary gear being offset from the main gear in a counterclockwise direction at a certain angle.

[0008] Furthermore, a first cylindrical boss is coaxially connected to one end face of the main gear, and a second cylindrical boss is coaxially connected to the other end face; a first auxiliary gear is sleeved on the outside of the first cylindrical boss and is snapped and fixed to the first cylindrical boss, and a second auxiliary gear is sleeved on the outside of the second cylindrical boss and is snapped and fixed to the second cylindrical boss; the main gear, the first cylindrical boss, and the second cylindrical boss are all provided with through shaft holes in the middle.

[0009] Furthermore, a first annular groove is provided on the outer periphery of the first cylindrical boss, and a first retaining ring is engaged in the first annular groove. The first retaining ring is used to limit the overlap of the first auxiliary gear and the main gear.

[0010] Furthermore, a second annular groove is provided on the outer periphery of the second cylindrical boss, and a second retaining ring is engaged in the second annular groove. The second retaining ring is used to limit the overlap of the second auxiliary gear and the main gear.

[0011] Furthermore, the first auxiliary gear has a first groove surface on the side adjacent to the main gear, and the two first groove surfaces enclose a first installation space; the second auxiliary gear has a second groove surface on the side adjacent to the main gear, and the two second groove surfaces enclose a second installation space.

[0012] Furthermore, a first limiting post is provided on the end face of the first auxiliary gear near the main gear, and a second limiting post is provided on the end face of the main gear near the first auxiliary gear. A first C-shaped elastic retaining ring is provided between the first auxiliary gear and the main gear. Both ends of the first C-shaped elastic retaining ring are provided with grooves. The first C-shaped elastic retaining ring abuts against the first limiting post and the second limiting post through the grooves at both ends of its ends, respectively.

[0013] Furthermore, a third limiting post is provided on the end face of the second auxiliary gear near the main gear, and a fourth limiting post is provided on the end face of the main gear near the second auxiliary gear. A second C-shaped elastic retaining ring is provided between the second auxiliary gear and the main gear. Both ends of the second C-shaped elastic retaining ring are provided with grooves. The second C-shaped elastic retaining ring abuts against the third limiting post and the fourth limiting post through the grooves at both ends of its ends.

[0014] Furthermore, the main gear, the first auxiliary gear, and the second auxiliary gear are all provided with aligned limiting screw holes, and a limiting bolt is inserted through the limiting screw hole. The diameter of the limiting screw hole is larger than the outer diameter of the limiting bolt.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] By setting a second auxiliary gear on the other side of the main gear, when the main gear meshes with the drive gear and rotates in opposite directions, the teeth of the second auxiliary gear are pressed tightly against the non-working surface of the drive gear under the torque of the second torque reset component. Thus, when the drive gear changes direction and rotates forward, it needs to overcome the torque of the second torque reset component, thereby reducing the tooth impact with the main gear and reducing noise. By setting the cooperation between the first and second auxiliary gears, the tooth impact of the main gear can be reduced when rotating in both directions, thereby reducing noise and adapting to situations where the gear transmission direction needs to be changed multiple times. Attached Figure Description

[0017] Figure 1 This is an overall assembly drawing of the noise-reducing gear of the present invention;

[0018] Figure 2 This is an exploded view of the noise reduction gear of the present invention;

[0019] Figure 3 This is an exploded view of the noise reduction gear of the present invention;

[0020] Figure 4 This is a partial schematic diagram of the gear teeth of the noise-reducing gear of the present invention;

[0021] In the diagram: 1. Main gear; 2. First auxiliary gear; 3. Second auxiliary gear; 4. First cylindrical boss; 5. Second cylindrical boss; 6. Shaft hole; 7. First annular groove; 8. First retaining ring; 9. Second annular groove; 10. Second retaining ring; 11. First limiting post; 12. Second limiting post; 13. First C-type elastic retaining ring; 14. Third limiting post; 15. Fourth limiting post; 16. Second C-type elastic retaining ring; 17. Limiting screw hole; 18. Limiting bolt. Detailed Implementation

[0022] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In the description of this invention, it should be noted that the terms "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", "horizontal", "vertical", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0024] When the main gear 1 meshes with the drive gear as the driven gear, there is a certain backlash between the non-working surfaces of the main gear 1 and the drive gear. This backlash is used to form a lubricating oil film to prevent jamming due to tooth friction, heat, and expansion. However, the presence of tooth backlash will cause inter-tooth impact, affecting the smoothness of gear transmission. The existing solution is to add a secondary gear on one side of the main gear 1. The secondary gear and the main gear 1 are offset by a certain angle. When the main gear 1 meshes with the drive gear, the teeth of the secondary gear are located between two teeth of the drive gear. At this time, the working surfaces of the teeth of the main gear 1 and the drive gear are in contact, and one side of the tooth surface of the secondary gear is in close contact with the non-working surface of the drive gear. In this way, when the main gear rotates in the reverse direction, the inter-tooth impact is reduced due to the buffering effect of the secondary gear, thereby reducing noise. However, the drawback is that in actual working conditions, after the main gear rotates in the reverse direction, it sometimes needs to rotate in different directions multiple times. After the main gear rotates in the reverse direction and then rotates in the forward direction, there will still be inter-tooth impact, resulting in greater noise. Therefore, the following technical solution is proposed to address the above defects.

[0025] like Figures 1 to 4As shown, a noise-reducing gear with automatic adjustment of meshing backlash includes a main gear 1. A first auxiliary gear 2 is coaxially connected to one end face of the main gear 1. A first torque reset component is connected between the main gear 1 and the first auxiliary gear 2. The first auxiliary gear 2 is offset from the main gear 1 in a clockwise direction at a certain angle. By setting the first auxiliary gear 2 on one side of the main gear 1, when the main gear 1 meshes with the drive gear and rotates in the forward direction, the teeth of the first auxiliary gear 2 are in close contact with the non-working surface of the drive gear under the torque of the first torque reset component. Therefore, when the drive gear changes direction and rotates in the reverse direction, it needs to overcome the torque of the first torque reset component, thereby reducing the tooth impact with the main gear 1 and reducing noise. A second auxiliary gear 3 is coaxially connected to the other end face of the main gear 1. A connection is made between the main gear 1 and the second auxiliary gear 3. A second torque reset component is provided. The second auxiliary gear 3 is offset from the main gear 1 by a certain angle in the counterclockwise direction. The pitch circle diameter and module of the main gear 1, the first auxiliary gear 2, and the second auxiliary gear 3 are all equal. By setting the second auxiliary gear 3 on the other side of the main gear 1, when the main gear 1 meshes with the drive gear and rotates in the opposite direction, the teeth of the second auxiliary gear 3 are in close contact with the non-working surface of the drive gear under the torque of the second torque reset component. Thus, when the drive gear changes direction and rotates forward, it needs to overcome the torque of the second torque reset component, thereby reducing the tooth impact with the main gear 1 and reducing noise. By setting the cooperation between the first auxiliary gear 2 and the second auxiliary gear 3, the tooth impact of the main gear can be reduced when rotating in both directions, thereby reducing noise and adapting to situations where the force transmission direction needs to be changed multiple times.

[0026] One end face of the main gear 1 is coaxially connected to a first cylindrical boss 4, and the other end face is coaxially connected to a second cylindrical boss 5; the first auxiliary gear 2 is sleeved on the outside of the first cylindrical boss 4 and is snapped and fixed to the first cylindrical boss 4; the second auxiliary gear 3 is sleeved on the outside of the second cylindrical boss 5 and is snapped and fixed to the second cylindrical boss 5; the main gear 1, the first cylindrical boss 4 and the second cylindrical boss 5 are all provided with through shaft holes 6 in the middle.

[0027] The outer periphery of the first cylindrical boss 4 is provided with a first annular groove 7, and a first retaining ring 8 is engaged within the first annular groove 7. The first retaining ring 8 is used to limit the overlap of the first auxiliary gear 2 and the main gear 1. The outer periphery of the second cylindrical boss 5 is provided with a second annular groove 9, and a second retaining ring 10 is engaged within the second annular groove 9. The second retaining ring 10 is used to limit the overlap of the second auxiliary gear 3 and the main gear 1. By setting the engagement method of the annular groove and the retaining ring, the first auxiliary gear 2 or the second auxiliary gear 3 can be overlapped with the main gear 1 without restricting the rotation of the first auxiliary gear 2 and the second auxiliary gear 3 relative to the main gear 1, while facilitating the disassembly of the first auxiliary gear 2 and the second auxiliary gear 3.

[0028] The first auxiliary gear 2 has a first groove on the side adjacent to the main gear 1, and the two first grooves enclose a first mounting space. The second auxiliary gear 3 has a second groove on the side adjacent to the main gear 1, and the two second grooves enclose a second mounting space. By providing the first mounting space, the installation of the first torque reset component is facilitated, thereby allowing the first auxiliary gear 2 and the main gear 1 to fit seamlessly together, reducing the space occupied. Similarly, by providing the second mounting space, the installation of the second torque reset component is facilitated, thereby allowing the second auxiliary gear 3 and the main gear 1 to fit seamlessly together, reducing the space occupied.

[0029] The first auxiliary gear 2 has a first limiting post 11 on its end face near the main gear 1, and the main gear 1 has a second limiting post 12 on its end face near the first auxiliary gear 2. A first C-shaped elastic retaining ring 13 is provided between the first auxiliary gear 2 and the main gear 1. Both ends of the first C-shaped elastic retaining ring 13 have grooves, and the first C-shaped elastic retaining ring 13 abuts against the first limiting post 11 and the second limiting post 12 through the grooves at both ends. When the main gear 1 meshes with the drive gear, the first C-shaped elastic retaining ring 13 is always in a stored state, that is, an outwardly expanding state. The first C-shaped elastic retaining ring 13 squeezes the first limiting post 11 and the second limiting post 12 through the grooves at both ends. Since the first limiting post 11 is fixed to the main gear 1, the first C-shaped elastic retaining ring 13 pushes the second limiting post 12. The second limiting post 12 causes the first auxiliary gear 2 to be misaligned with the main gear 1, so that the teeth of the first auxiliary gear 2 are in close contact with the non-working surface of the teeth of the main gear 1.

[0030] The second auxiliary gear 3 has a third limiting post 14 on its end face near the main gear 1, and the main gear 1 has a fourth limiting post 15 on its end face near the second auxiliary gear 3. A second C-shaped elastic retaining ring 16 is provided between the second auxiliary gear 3 and the main gear 1. Both ends of the second C-shaped elastic retaining ring 16 have grooves, and the second C-shaped elastic retaining ring 16 abuts against the third limiting post 14 and the fourth limiting post 15 through the grooves at both ends. The principle of the second C-shaped elastic retaining ring 16 is the same as that of the first C-shaped elastic retaining ring 13, and will not be described in detail here.

[0031] The main gear 1, the first auxiliary gear 2, and the second auxiliary gear 3 are all provided with aligned limiting screw holes 17, and limiting bolts 18 are inserted through the limiting screw holes 17. The diameter of the limiting screw holes 17 is larger than the outer diameter of the limiting bolts 18. By setting the limiting bolts 18 to pass through the limiting screw holes 17, and making the diameter of the limiting screw holes 17 larger than the outer diameter of the limiting bolts 18, the maximum misalignment angle of the first auxiliary gear 2 or the second auxiliary gear 3 relative to the main gear 1 is limited.

[0032] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A noise-reducing gear with automatic adjustment of meshing backlash, comprising a main gear (1), wherein a first auxiliary gear (2) is coaxially connected to one end face of the main gear (1), the pitch circle diameter and module of the main gear (1) and the first auxiliary gear (2) are equal, a first torque reset member is provided between the main gear (1) and the first auxiliary gear (2), and the first auxiliary gear (2) is offset from the main gear (1) in a clockwise direction at a certain angle, characterized in that, The other end face of the main gear (1) is coaxially connected to the second auxiliary gear (3). The pitch circle diameter and module of the main gear (1) and the second auxiliary gear (3) are equal. A second torque reset component is provided between the main gear (1) and the second auxiliary gear (3). The second auxiliary gear (3) is offset from the main gear (1) in a counterclockwise direction by a certain angle. The first auxiliary gear (2) has a first limiting post (11) on one side end face near the main gear (1), and the main gear (1) has a second limiting post (12) on one side end face near the first auxiliary gear (2). The first torque reset component is a first C-shaped elastic retaining ring (13). Both ends of the first C-shaped elastic retaining ring (13) are provided with grooves. The first C-shaped elastic retaining ring (13) abuts against the first limiting post (11) and the second limiting post (12) respectively through the grooves at both ends. The second auxiliary gear (3) has a third limiting post (14) on one side of the main gear (1) and a fourth limiting post (15) on one side of the main gear (1) near the second auxiliary gear (3). The second torque reset component is a second C-shaped elastic retaining ring (16). Both ends of the second C-shaped elastic retaining ring (16) are provided with grooves. The second C-shaped elastic retaining ring (16) abuts against the third limiting post (14) and the fourth limiting post (15) respectively through the grooves at both ends. The main gear (1), the first auxiliary gear (2) and the second auxiliary gear (3) are all provided with aligned limiting screw holes (17), and a limiting bolt (18) is provided through the limiting screw hole (17). The diameter of the limiting screw hole (17) is larger than the outer diameter of the limiting bolt (18).

2. The noise-reducing gear with automatic adjustment of meshing backlash according to claim 1, characterized in that, The main gear (1) is coaxially connected to a first cylindrical boss (4) on one side end face and coaxially connected to a second cylindrical boss (5) on the other side end face; the first auxiliary gear (2) is sleeved on the outside of the first cylindrical boss (4) and is snapped and fixed to the first cylindrical boss (4); the second auxiliary gear (3) is sleeved on the outside of the second cylindrical boss (5) and is snapped and fixed to the second cylindrical boss (5); the main gear (1), the first cylindrical boss (4) and the second cylindrical boss (5) are all provided with a shaft hole (6) through the middle.

3. A noise-reducing gear with automatic adjustment of meshing backlash according to claim 2, characterized in that, The outer periphery of the first cylindrical boss (4) is provided with a first annular groove (7), and a first retaining ring (8) is provided in the first annular groove (7). The first retaining ring (8) is used to overlap and limit the first auxiliary gear (2) and the main gear (1).

4. A noise-reducing gear with automatic adjustment of meshing backlash according to claim 2, characterized in that, The second cylindrical boss (5) has a second annular groove (9) on its outer periphery, and a second retaining ring (10) is fitted inside the second annular groove (9). The second retaining ring (10) is used to overlap and limit the second auxiliary gear (3) with the main gear (1).

5. A noise-reducing gear with automatic adjustment of meshing backlash according to claim 1, characterized in that, The first auxiliary gear (2) has a first groove surface on the side close to the main gear (1), and the two first groove surfaces form a first installation space; the second auxiliary gear (3) has a second groove surface on the side close to the main gear (1), and the two second groove surfaces form a second installation space.

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