Gear backlash eliminating mechanism, transmission device and automobile headlight adjustment device

Abstract

The present invention belongs to the technical field of gear transmission, and particularly relates to a gear clearance eliminating mechanism, a transmission device and an automobile headlight adjustment device. The gear clearance eliminating mechanism includes a clearance eliminating gear and a clearance eliminating assembly. The clearance eliminating gear is used to mesh with an external gear. The clearance eliminating gear is provided with a mounting cavity. The clearance eliminating assembly is installed in the mounting cavity. The clearance eliminating assembly is used to provide elastic force in the radial direction of the clearance eliminating gear, so that the clearance eliminating gear can move in the radial direction of the clearance eliminating gear relative to the clearance eliminating assembly. The clearance eliminating assembly is used to connect with an external output shaft. Since the clearance eliminating assembly provides elastic force in the radial direction of the clearance eliminating gear, the clearance eliminating gear can always maintain a relatively tight meshing with the external gear under the action of the elastic force, and is always in a contact state to eliminate the matching clearance between the gears. Then, in the process of switching from forward rotation to reverse rotation, the phenomenon of a certain amount of idle travel of the gear rotation is effectively reduced, the gear transmission accuracy is improved, and the impact generated by the gear tooth surface is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of gear transmission, and in particular relates to a gear backlash eliminating mechanism, a transmission device and an automobile headlight adjusting device. Background Art

[0002] In the field of mechanical transmission, involute gear transmission is the most widely used transmission form. It has the advantages of high transmission efficiency, stable operation and long service life, and is widely used, such as in automobile headlight adjustment devices. However, there are certain errors in the manufacturing and assembly of gears, that is, the actual manufactured gears have tooth profile errors, tooth direction errors, etc. At the same time, the tooth surface of the gear has ups and downs at the microscopic level, that is, the tooth surface of the gear cannot perfectly coincide with the theoretical involute.

[0003] In addition, there is a fit clearance between the gear shaft used to set the gear and its corresponding mounting hole, as well as manufacturing errors in the center distance between the gear and the mounting hole, which leads to a tiny side clearance in the meshing process of the involute gear. That is, when a pair of gears are meshed, the tooth surfaces on the left and right sides are not in contact at the same time. When the tooth surfaces on one side of a pair of gears are in contact, the tooth surfaces on the other side will be separated by a certain distance.

[0004] From the above analysis, we can know that when the gear switches from forward rotation to reverse rotation, the gear will rotate a certain amount of idle travel, that is, the distance of the side clearance. This brings many adverse effects to the transmission device that requires positioning accuracy for both forward and reverse rotations. The gear tooth surface will produce impact, and the reciprocating positioning accuracy of the gear transmission will also be reduced. Summary of the invention

[0005] The purpose of the present invention is to provide a gear backlash eliminating mechanism, a transmission device and a car headlight adjustment device, aiming to solve the technical problem in the prior art that when the gear switches from forward rotation to reverse rotation, the gear will rotate a certain amount of idle travel.

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

[0007] A gear clearance eliminating mechanism comprises a clearance eliminating gear and a clearance eliminating assembly, wherein the clearance eliminating gear is used to mesh with an external gear, the clearance eliminating gear is provided with a mounting cavity, the clearance eliminating assembly is installed in the mounting cavity, the clearance eliminating assembly is used to provide elastic force in the radial direction of the clearance eliminating gear so that the clearance eliminating gear can move in the radial direction of the clearance eliminating gear relative to the clearance eliminating assembly, and the clearance eliminating assembly is used to be connected to an external output shaft.

[0008] Optionally, the anti-backlash assembly includes an anti-backlash guide rail and an elastic member, the anti-backlash guide rail is installed in the mounting cavity and is located in the radial direction of the anti-backlash gear, a radial gap is left between at least one end of the anti-backlash guide rail and the radial cavity wall of the mounting cavity, the elastic member abuts between the anti-backlash guide rail and the anti-backlash gear and is used to provide elastic force in the radial direction of the anti-backlash gear, and the anti-backlash guide rail is used to connect to an external output shaft.

[0009] Optionally, the anti-backlash guide rail includes a first block, which is arranged in the installation cavity; located in the circumferential direction of the anti-backlash gear, and two sides of the first block are in contact with the circumferential cavity wall of the installation cavity; located in the radial direction of the anti-backlash gear, and the radial gap is left between at least one end of the first block and the radial cavity wall of the installation cavity.

[0010] Optionally, a blind hole extending radially along the anti-backlash gear is provided on the first block, and the elastic member is arranged in the blind hole and abuts against a cavity wall of the installation cavity.

[0011] Optionally, the anti-backlash guide rail further includes a second block, the second block is connected to the first block, the second block is located outside the installation cavity and fits with the outer surface of the anti-backlash gear.

[0012] Optionally, the mounting cavity is arranged on the axial end face of the anti-backlash gear.

[0013] The beneficial effects of the gear backlash eliminating mechanism provided by the embodiment of the present invention, compared with the prior art, are as follows:

[0014] The gear clearance eliminating mechanism of the present invention provides a clearance eliminating component on the clearance eliminating gear. In the process of meshing the clearance eliminating gear with the external gear, the clearance eliminating component provides elastic force in the radial direction of the clearance eliminating gear. In this way, the clearance eliminating gear can always maintain a relatively tight meshing with the external gear under the action of the elastic force and is always in a contact state to eliminate the matching clearance between the gears. Therefore, in the process of switching the gear from forward rotation to reverse rotation, the phenomenon of a certain amount of idle travel of the gear is effectively reduced, the gear transmission accuracy is improved, the impact on the tooth surface of the gear is reduced, and the use effect is good.

[0015] Another technical solution provided by an embodiment of the present invention is:

[0016] A transmission device comprises at least one transmission gear and the above-mentioned gear backlash eliminating mechanism, wherein the backlash eliminating gear is meshed with the transmission gear.

[0017] The transmission device provided by the embodiment of the present invention uses the above-mentioned gear clearance eliminating mechanism, so that when the clearance eliminating gear is meshed with the transmission gear, it is always in a contact state, so as to eliminate the matching clearance between the gears, improve the gear transmission accuracy, reduce the impact generated by the gear tooth surface, and have a good use effect.

[0018] Optionally, the transmission device further comprises a driving member, a driving end of which is connected to the transmission gear and drives the transmission gear to rotate;

[0019] Alternatively, the transmission device further comprises a driving member and a transmission mechanism, wherein the driving end of the driving member is connected to the input end of the transmission mechanism and drives the transmission mechanism to rotate, and the output end of the transmission mechanism is connected to the transmission gear and drives the transmission gear to rotate.

[0020] Optionally, the transmission device further includes an output shaft, and the anti-backlash guide rail is fixedly connected to the output shaft and is used to drive the output shaft to rotate.

[0021] Another technical solution provided by the embodiment of the present invention is:

[0022] An automobile headlight adjustment device comprises the above-mentioned transmission device.

[0023] The automobile headlight adjustment device provided in the embodiment of the present invention effectively improves the accuracy of automobile headlight angle adjustment and improves the safety of automobile night driving due to the use of the above-mentioned transmission device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0025] Figure 1 A schematic diagram of the structure of a gear backlash eliminating mechanism provided by an embodiment of the present invention;

[0026] Figure 2 for Figure 1 Schematic diagram of the exploded structure of the gear backlash elimination mechanism;

[0027] Figure 3 A schematic diagram of a portion of the structure of a transmission device provided by an embodiment of the present invention;

[0028] Figure 4 for Figure 3 A schematic cross-sectional structure diagram of a transmission device;

[0029] Figure 5A schematic diagram of the structure of a transmission device provided by an embodiment of the present invention;

[0030] Figure 6 A schematic diagram of the internal structure of a transmission device provided in an embodiment of the present invention.

[0031] Among them, the reference numerals in the figure are:

[0032] 10—anti-backlash gear;

[0033] 11—installation cavity; 111—radial cavity wall; 112—circumferential cavity wall;

[0034] 20—anti-backlash assembly;

[0035] 21—anti-backlash guide rail; 22—elastic member; 211—first block; 212—second block; 213—blind hole;

[0036] 30—Radial clearance;

[0037] 40—transmission gear;

[0038] 50—driving member;

[0039] 60—transmission mechanism;

[0040] 70—output shaft;

[0041] 80—Shell. DETAILED DESCRIPTION

[0042] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. Figures 1 to 6 The described embodiments are exemplary and intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0043] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0045] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] like Figure 1 , Figure 2 and Figure 3 As shown, the gear backlash eliminating mechanism provided by the embodiment of the present invention is now described. The gear backlash eliminating mechanism includes a backlash eliminating gear 10 and a backlash eliminating assembly 20. The backlash eliminating gear 10 is used to mesh with an external gear. The backlash eliminating gear 10 is provided with a mounting cavity 11. The backlash eliminating assembly 20 is installed in the mounting cavity 11. The backlash eliminating assembly 20 is used to provide elastic force in the radial direction of the backlash eliminating gear 10 so that the backlash eliminating gear 10 can move in the radial direction of the backlash eliminating gear 10 relative to the backlash eliminating assembly 20. The backlash eliminating assembly 20 is used to be connected to an external output shaft 70.

[0047] Compared with the prior art, the gear anti-backlash mechanism provided in the embodiment of the present invention provides an anti-backlash component 20 on the anti-backlash gear 10. In the process of the anti-backlash gear 10 meshing with the external gear, the anti-backlash component 20 provides elastic force in the radial direction of the anti-backlash gear 10. In this way, the anti-backlash gear 10 always maintains a relatively tight meshing with the external gear under the action of the elastic force and is always in a contact state to eliminate the matching clearance between the gears. Therefore, in the process of the gear switching from forward rotation to reverse rotation, the phenomenon of a certain amount of idle travel of the gear is effectively reduced, the gear transmission accuracy is improved, the impact on the tooth surface of the gear is reduced, and the use effect is good.

[0048] Among them, the anti-backlash gear 10 is preferably a sector gear box, and can also be other types of non-eccentric gears; the external gear can be various gears combined with the anti-backlash gear 10, which can be set as needed.

[0049] In one embodiment, Figure 1 , Figure 2 and Figure 4As shown, the anti-backlash assembly 20 includes an anti-backlash guide rail 21 and an elastic member 22. The anti-backlash guide rail 21 is installed in the mounting cavity 11 and is located in the radial direction of the anti-backlash gear 10. A radial gap 30 is left between at least one end of the anti-backlash guide rail 21 and the radial cavity wall 111 of the mounting cavity 11. The elastic member 22 abuts between the anti-backlash guide rail 21 and the anti-backlash gear 10 and is used to provide elastic force in the radial direction of the anti-backlash gear 10. The anti-backlash guide rail 21 is used to connect to an external output shaft 70.

[0050] Specifically, when in use, the anti-backlash guide 21 is in a fixed state, and the anti-backlash guide 21 is used to guide the anti-backlash gear 10 to move radially; the radial gap 30 left between the anti-backlash guide 21 and the radial cavity wall 111 of the mounting cavity 11 in the radial direction of the anti-backlash gear 10 serves as the radial activity space of the anti-backlash gear 10, so that the anti-backlash gear 10 can move back and forth in the radial direction along the anti-backlash guide 21.

[0051] It can be seen from the above that since the anti-backlash guide 21 is in a fixed state, the elastic member 22 is held between the anti-backlash guide 21 and the anti-backlash gear 10 in a certain compressed state. When the anti-backlash gear 10 and the external gear are not tightly engaged, the elastic member 22 moves the anti-backlash gear 10 toward the external gear through the action of its elastic force, so that the two are tightly engaged, eliminating the matching clearance between the gears, and meeting the requirements of accurate small transmission of the product; when the anti-backlash gear 10 and the external gear are too tightly engaged, that is, the meshing clearance between the two is too small, the elastic member 22 can be compressed to ensure that the anti-backlash gear 10 and the external gear are engaged normally, and the elastic member 22 plays a good regulating role.

[0052] The elastic member 22 is preferably a long strip-shaped spring, and may also be other types of elastic devices that can provide reciprocating elastic force.

[0053] In one embodiment, as shown in FIG. Figure 2 and Figure 4 As shown, the anti-backlash guide rail 21 includes a first block 211, which is arranged in the installation cavity 11; located in the circumferential direction of the anti-backlash gear 10, both sides of the first block 211 are in contact with the circumferential cavity wall 112 of the installation cavity 11; located in the radial direction of the anti-backlash gear 10, a radial gap 30 is left between at least one end of the first block 211 and the radial cavity wall 111 of the installation cavity 11.

[0054] Specifically, by making the two sides of the first block 211 fit with the circumferential cavity wall 112 of the installation cavity 11, the first block 211 and the anti-backlash gear 10 can be accurately transmitted in the circumferential direction, that is, the anti-backlash gear 10 can drive the first block 211 to rotate synchronously in the circumferential direction, so that when the first block 211 is connected to the external output shaft 70, the external output shaft 70 is driven to rotate to achieve transmission. The radial gap 30 left between the first block 211 and the radial cavity wall 111 of the installation cavity 11 is the radial activity space of the anti-backlash gear 10.

[0055] The shape of the first block 211 is preferably a long columnar body, such as a cylinder, a cuboid, a cube or other columns with a polygonal cross section.

[0056] In one embodiment, Figure 2 As shown, the first block 211 is provided with a blind hole 213 extending along the radial direction of the backlash-eliminating gear 10 , and the elastic member 22 is arranged in the blind hole 213 and abuts against the cavity wall of the installation cavity 11 .

[0057] Specifically, by providing a blind hole 213 adapted to the elastic member 22, after the elastic member 22 is arranged in the blind hole 213, the blind hole 213 restricts the elastic member 22, ensuring that the elastic member 22 generates elastic force in the radial direction of the anti-backlash gear 10 to drive the anti-backlash gear 10 to move in the radial direction.

[0058] In one embodiment, Figure 2 As shown, the anti-backlash guide rail 21 further includes a second block 212 , which is connected to the first block 211 . The second block 212 is located outside the installation cavity 11 and fits against the outer surface of the anti-backlash gear 10 .

[0059] Specifically, the second block 212 is arranged outside the installation cavity 11 and fits with the outer surface of the anti-backlash gear 10. First, it plays a limiting role to limit the first block 211 from leaving the installation cavity 11, and then it also plays an auxiliary guiding role, so that the anti-backlash gear 10 can move more smoothly in the radial direction relative to the first block 211, thereby ensuring the transmission accuracy.

[0060] In one embodiment, Figure 1 As shown, the mounting cavity 11 is arranged on the axial end surface of the anti-backlash gear 10 .

[0061] Specifically, by arranging the mounting cavity 11 on the axial end face of the anti-backlash gear 10, the anti-backlash assembly 20 can drive the anti-backlash gear 10 to mesh closely with the external gear without affecting the meshing of the gears.

[0062] like Figure 3 , Figure 4 and Figure 5As shown, an embodiment of the present invention further provides a transmission device, comprising at least one transmission gear 40 and the above-mentioned gear backlash eliminating mechanism, wherein the backlash eliminating gear 10 is meshed with the transmission gear 40 .

[0063] The transmission device provided by the embodiment of the present invention uses the above-mentioned gear clearance eliminating mechanism, so that when the clearance eliminating gear 10 is meshed with the transmission gear 40, it is always in a contact state, so as to eliminate the matching clearance between the gears, improve the gear transmission accuracy, reduce the impact generated by the gear tooth surface, and have a good use effect.

[0064] In one embodiment, Figure 6 As shown, the transmission device further includes a driving member 50, a driving end of the driving member 50 is connected to the transmission gear 40 and drives the transmission gear 40 to rotate.

[0065] Specifically, when in use, the transmission gear 40 is meshed with the anti-backlash gear 10, and the driving member 50 serves as the power input end of the transmission gear 40. The driving member 50 drives the transmission gear 40 to rotate, and the anti-backlash gear 10 is driven to rotate through the transmission of the transmission gear 40. The anti-backlash gear 10 drives the external output shaft 70 connected to the anti-backlash assembly 20 to rotate, thereby realizing the rotation function.

[0066] The driving member 50 may be a motor, but is not limited to a motor, and may be connected to an external connection port through a terminal wire / FPC to provide power.

[0067] In one embodiment, Figure 6 As shown, the transmission device also includes a driving member 50 and a transmission mechanism 60. The driving end of the driving member 50 is connected to the input end of the transmission mechanism 60 and drives the transmission mechanism 60 to rotate. The output end of the transmission mechanism 60 is connected to the transmission gear 40 and drives the transmission gear 40 to rotate.

[0068] Specifically, a transmission mechanism 60 can be set between the driving member 50 and the transmission gear 40 so that the transmission mechanism 60 can play a deceleration or acceleration role between the driving member 50 and the transmission gear 40. The specific role can be achieved by adjusting the transmission ratio of the gears inside the transmission mechanism 60 and can be set as needed.

[0069] Furthermore, the transmission device also includes a housing 80, and the driving member 50, the transmission mechanism 60, the transmission gear 40 and the gear backlash eliminating mechanism are all installed in the housing 80. The housing 80 is provided with an output hole for inserting the external output shaft 70.

[0070] The transmission mechanism 60 may be a gear transmission assembly, a parallel axis gear transmission assembly, a planetary gear transmission assembly, or the like.

[0071] The transmission mechanism 60 can be in a single-stage transmission or a multi-stage transmission mode.

[0072] The transmission type of the transmission mechanism 60 can be a worm gear transmission, a spur gear transmission, a face gear transmission or a helical gear transmission.

[0073] In one embodiment, Figure 6 As shown, the transmission device also includes an output shaft 70, and the anti-backlash guide rail 21 is fixedly connected to the output shaft 70 and is used to drive the output shaft 70 to rotate.

[0074] Specifically, one end of the output shaft 70 is fixedly connected to the anti-backlash guide rail 21, and the other end of the output shaft 70 extends out of the output hole of the shell 80 to be connected to the external device. The output shaft 70 defines the working center of the anti-backlash assembly 20 to drive the external device to rotate and achieve accurate transmission.

[0075] With the continuous development of automotive electronic technology, safe driving and intelligent driving have put forward higher and higher requirements on automotive electronics and automotive structural design. As an important part of safe driving at night, the headlight adjustment device needs to have a certain degree of accuracy.

[0076] An embodiment of the present invention further provides a vehicle headlight adjustment device, comprising the above-mentioned transmission device.

[0077] The automobile headlight adjustment device provided in the embodiment of the present invention effectively improves the accuracy of automobile headlight angle adjustment and improves the safety of automobile night driving due to the use of the above-mentioned transmission device.

[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A gear backlash eliminating mechanism, characterized in that: It comprises an anti-backlash gear and an anti-backlash assembly, wherein the anti-backlash gear is used to mesh with an external gear, the anti-backlash gear is provided with a mounting cavity, the anti-backlash assembly is mounted in the mounting cavity, the anti-backlash assembly is used to provide elastic force in the radial direction of the anti-backlash gear, so that the anti-backlash gear can move relative to the anti-backlash assembly in the radial direction of the anti-backlash gear, and the anti-backlash assembly is used to connect with an external output shaft; wherein the anti-backlash gear is a non-eccentric gear; The anti-backlash assembly comprises an anti-backlash guide rail and an elastic member, wherein the anti-backlash guide rail is installed in the installation cavity and is located in the radial direction of the anti-backlash gear, a radial gap is left between at least one end of the anti-backlash guide rail and the radial cavity wall of the installation cavity, the elastic member abuts between the anti-backlash guide rail and the anti-backlash gear and is used to provide elastic force in the radial direction of the anti-backlash gear, and the anti-backlash guide rail is used to be connected to an external output shaft; The anti-backlash guide rail includes a first block, which is arranged in the installation cavity; located in the circumferential direction of the anti-backlash gear, the two sides of the first block are in contact with the circumferential cavity wall of the installation cavity; located in the radial direction of the anti-backlash gear, the radial gap is left between at least one end of the first block and the radial cavity wall of the installation cavity.

2. The gear backlash eliminating mechanism according to claim 1, characterized in that: The first block is provided with a blind hole extending radially along the backlash-eliminating gear, and the elastic member is arranged in the blind hole and abuts against the cavity wall of the installation cavity.

3. The gear backlash eliminating mechanism according to claim 1, characterized in that: The anti-backlash guide rail also includes a second block, which is connected to the first block. The second block is located outside the installation cavity and fits with the outer surface of the anti-backlash gear.

4. The gear backlash eliminating mechanism according to claim 1, characterized in that: The mounting cavity is arranged on the axial end surface of the anti-backlash gear.

5. A transmission device, characterized in that: It comprises at least one transmission gear and the gear backlash eliminating mechanism according to any one of claims 1 to 4, wherein the backlash eliminating gear is meshed with the transmission gear.

6. The transmission device according to claim 5, characterized in that: The transmission device further comprises a driving member, a driving end of which is connected to the transmission gear and drives the transmission gear to rotate; Alternatively, the transmission device further comprises a driving member and a transmission mechanism, wherein the driving end of the driving member is connected to the input end of the transmission mechanism and drives the transmission mechanism to rotate, and the output end of the transmission mechanism is connected to the transmission gear and drives the transmission gear to rotate.

7. The transmission device according to claim 5, characterized in that: The transmission device also includes an output shaft, and the anti-backlash guide rail is fixedly connected to the output shaft and is used to drive the output shaft to rotate.

8. An automobile headlight adjustment device, characterized in that: A transmission device comprising any one of claims 5 to 7.

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