A high-precision gear transmission backlash elimination mechanism

Abstract

This invention provides a high-precision gear transmission backlash elimination mechanism, comprising a fixed gear and a movable gear. The fixed gear is integrally machined onto the gear shaft, and a raised arc-shaped pad is provided on its end face near the movable gear. The movable gear is coaxial with the fixed gear and has the same tooth profile. A coaxial arc-shaped groove is provided on the movable gear at a corresponding position to the arc-shaped pad. A wedge block is inserted between the arc-shaped groove and the arc-shaped pad, causing an angular offset between the movable gear and the fixed gear. An adjusting screw mounting hole is provided on the end face of the movable gear near the arc-shaped groove adjacent to the wedge block. Screwing in the adjusting screw presses the wedge block in, eliminating backlash while preventing the wedge block from loosening. As the gear wears down over time, increasing backlash, it can be eliminated by screwing in the adjusting screw. The gear transmission system using this backlash elimination mechanism has no significant change in size and features high speed resistance, heavy impact load resistance, and high precision.

Description

Technical Field

[0001] This utility model belongs to the field of high-precision gear transmission technology, specifically relating to a high-precision gear transmission backlash elimination mechanism. Background Technology

[0002] Currently, the three most widely used backlash elimination mechanisms are: First, the gear center distance adjustment mechanism. This type of mechanism eliminates backlash by adjusting the center distance between two gears. It suffers from problems such as large size, cumbersome operation, and difficulty in re-eliminating backlash after long-term use. Second, the dual-motor backlash elimination mechanism. This uses two gears with motors for transmission. By controlling the speed of the two motors, the two gears rotate in a staggered manner to eliminate backlash. This mechanism is costly, bulky, requires precise control of the two motors, and is difficult to program. Third, the ordinary two-piece gear with identical tooth profile misaligned transmission backlash elimination mechanism. This ordinary misaligned transmission backlash elimination mechanism is bulky, difficult to install and debug, difficult to correct after long-term use, and difficult to apply to smaller gear transmission systems. Summary of the Invention

[0003] To address the aforementioned problems, the purpose of this utility model is to provide a high-precision gear transmission backlash elimination mechanism. It applies the backlash elimination principle of two gears with misaligned transmission, and the backlash can be eliminated by screwing in the adjusting screw. The gear transmission system and volume remain largely unchanged, and the mechanism is simple to operate and reliable in use.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A high-precision gear transmission backlash elimination mechanism includes a fixed gear and a movable gear. The fixed gear is integrally machined on the gear shaft, and a raised arc-shaped pad is provided on its end face near the movable gear. The movable gear is coaxial with the fixed gear and has the same tooth profile, and the movable gear is provided with a coaxial arc-shaped groove adapted to the arc-shaped pad. The arc length of the arc-shaped groove is slightly larger than that of the arc-shaped pad. A wedge block is inserted between the arc-shaped groove and the arc-shaped pad to cause an angular offset between the movable gear and the fixed gear, thereby eliminating backlash.

[0006] Furthermore, the movable gear adjacent to the wedge block has an adjustment screw mounting hole on its end face near the arc groove. Screwing in the adjustment screw can press the wedge block in, eliminating backlash while preventing the wedge block from loosening.

[0007] A fastening screw is provided between the movable gear and the fixed gear.

[0008] Compared with the prior art, the beneficial effects of this utility model are:

[0009] This invention utilizes the principle of backlash elimination through a two-gear misalignment transmission. First, a fixed gear, machined integrally with the gear shaft, is placed on its end face near the movable gear, with a protruding arc-shaped pad. The other movable gear, coaxial and with the same tooth profile, has a slightly larger arc-shaped groove machined at its corresponding position. A wedge is inserted between the arc-shaped groove and the arc-shaped pad, causing an angular offset between the movable and fixed gears, thus eliminating backlash. After the backlash elimination operation, the movable gear is reinforced with fastening screws. At this point, the fixed and movable gears become a single unit, each bearing transmission stress in one direction. The overall gear transmission system then achieves high-precision transmission.

[0010] This backlash elimination mechanism is specifically developed for gear transmission systems where conventional backlash elimination mechanisms cannot be applied due to size limitations. The size of the gear transmission system remains largely unchanged, and it can also be used in various other gear transmission systems. This backlash elimination mechanism features high speed resistance, heavy impact load resistance, and high precision. Furthermore, it has a simple structure, small size, low cost, and is easy to install and maintain. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of a high-precision gear transmission backlash elimination mechanism according to this utility model;

[0012] Figure 2 This is a cross-sectional view of the end face of a high-precision gear transmission backlash elimination mechanism according to this utility model.

[0013] Figure 3 This is an axial sectional view of a high-precision gear transmission backlash elimination mechanism according to this utility model. Detailed Implementation

[0014] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0015] Reference Figure 1-3 As shown, a high-precision gear transmission backlash elimination mechanism includes a fixed gear 1 and a movable gear 2. The fixed gear is integrally machined on the gear shaft 3, and a raised arc-shaped pad 4 is provided on its end face near the movable gear. The movable gear is coaxial with the fixed gear and has the same tooth profile, and the movable gear is provided with a coaxial arc-shaped groove 5 that matches the arc-shaped pad; the arc length of the arc-shaped groove is slightly larger than that of the arc-shaped pad; a wedge block 6 is wedged between the arc-shaped groove and the arc-shaped pad, causing an angular offset between the movable gear and the fixed gear to eliminate backlash.

[0016] like Figure 2 As shown, the movable gear adjacent to the wedge block 6 has an adjustment screw mounting hole on its end face near the arc groove. Screwing in the adjustment screw 7 can press the wedge block in, eliminating backlash while preventing the wedge block from loosening.

[0017] like Figure 1As shown, a fastening screw 8 is provided between the movable gear and the fixed gear. After the backlash elimination operation, the movable gear is reinforced with the fastening screw. At this time, the fixed gear and the movable gear become a whole, each bearing the transmission stress in one direction. At this time, the overall gear transmission system achieves high-precision transmission.

[0018] When gears wear down over time, the backlash increases. This can be eliminated by screwing in the adjusting screw.

Claims

1. A high-precision gear transmission backlash elimination mechanism, characterized in that, It includes a fixed gear and a movable gear; the fixed gear is machined as a single piece on the gear shaft, and a protruding arc-shaped pad is provided on its end face near the movable gear; the movable gear is coaxial with the fixed gear and has the same tooth profile, and the movable gear and the arc-shaped pad are provided with coaxial arc-shaped grooves with a slightly larger range of rotation at corresponding positions; By wedging a wedge between the arc-shaped groove and the arc-shaped pad, the movable gear and the fixed gear can be offset at an angle to eliminate backlash.

2. The high-precision gear transmission backlash elimination mechanism according to claim 1, characterized in that, The movable gear adjacent to the wedge block has an adjustment screw mounting hole on its end face near the arc groove. Screwing in the adjustment screw can press the wedge block in, eliminating backlash while preventing the wedge block from loosening.

3. The high-precision gear transmission backlash elimination mechanism according to claim 1, characterized in that, A fastening screw is provided between the movable gear and the fixed gear.

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