A scissor gear pre-tightening force measuring device

Abstract

The utility model discloses a kind of shear gear pretightening force measuring devices, it is related to gear clearance elimination technology, including gear fixed bolster and static torque sensor;A center positioning hole is equipped on the gear fixed bolster;The outer peripheral edge of gear fixed bolster one side extends several flanges towards the axial direction of the center positioning hole, several The flanges are distributed with the axis of the center positioning hole as center circle, and each of the flanges is equipped with the fixed tooth of telescopic adjustment towards the axis direction of the center positioning hole;The other side of the gear fixed bolster is equipped with flange connecting surface, the force end of the static torque sensor is fixedly connected with the flange connecting surface, and the other end of the static torque sensor is fixedly connected with a handle.The utility model can measure the pretightening force of shear gear, obtain actual data, and provide favorable help for evaluating the clearance elimination and noise reduction effect of shear gear.

Description

Technical Field

[0001] This utility model relates to the field of gear backlash elimination technology, and in particular to a scissor gear preload measuring device. Background Technology

[0002] For most gears, backlash contributes to smooth meshing. However, during gear rotation, backlash causes collisions between gears, resulting in meshing noise and vibration. To reduce this noise and vibration, scissor gears are used in gear systems. A scissor gear typically consists of two gear bodies. One gear body (the auxiliary gear) is adjacent to the other gear body (the primary gear) via a revolute joint and a rotating spring. When the scissor gear contacts its meshing gear, the two gear bodies, under the action of the springs, abut against each other's adjacent teeth, thus eliminating backlash and reducing noise during gear operation.

[0003] Currently, some diesel engines employ the aforementioned scissor gear backlash reduction scheme to optimize gear noise. During the manufacturing process, scissor gears use pins to position the main and auxiliary teeth. After installation on the engine, removing the pins and the preload provided by the internal spring causes a relative angular displacement between the main and auxiliary teeth, resulting in the main and auxiliary teeth of the scissor gear abutting against the meshing gear, thus reducing backlash. In the design of scissor gears, the gear preload significantly impacts their noise reduction effect. When evaluating the noise reduction effect of scissor gears, a test plan needs to be developed based on the gear preload parameters. However, due to the current lack of tools for measuring the preload of the main and auxiliary teeth of scissor gears, actual measurement data of the gear preload cannot be obtained. Traditional testing typically uses the preload design value for evaluation, that is, the elasticity design value of the internal spring of the scissor gear as a reference. However, springs have a certain error range in actual production, and their elasticity design value usually deviates from the actual value, ultimately affecting the accuracy of calculating the gear preload. Therefore, in order to more accurately evaluate the backlash reduction and noise reduction effect of scissor gears, it is necessary to design a measuring device that can measure the preload of scissor gears. Utility Model Content

[0004] This invention provides a scissor gear preload measuring device, which can measure the preload of scissor gears and obtain actual data, providing helpful assistance in evaluating the backlash reduction and noise reduction effect of scissor gears.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A scissor gear preload measuring device includes a gear fixing bracket and a static torque sensor. The gear fixing bracket has a central positioning hole. Several flanges extend axially from the outer peripheral edge of one side of the gear fixing bracket toward the central positioning hole. The flanges are circumferentially distributed around the axis of the central positioning hole, and each flange has a fixing tooth for telescopic adjustment in the axial direction of the central positioning hole. The other side of the gear fixing bracket has a flange connection surface. The force-bearing end of the static torque sensor is fixedly connected to the flange connection surface, and the other end of the static torque sensor is fixedly connected to a handle.

[0006] Furthermore, the fixing tooth is configured as a fixing screw, and the fixing screw is threadedly connected to a corresponding flange along the axial direction of the central positioning hole. The end of the fixing screw facing the axial direction of the central positioning hole has a conical structure.

[0007] Furthermore, the gear fixing bracket extends radially outward along the central positioning hole to form a plurality of support legs, which are arranged in a circular array at equal angles with the axis of the central positioning hole as the center. The outermost end of each support leg extends to one side in the direction of the axis of the central positioning hole to form the flange.

[0008] Furthermore, the inner surface of each flange is configured as an arc surface centered on the axis of the central positioning hole.

[0009] Furthermore, a step is provided on the other side of the gear fixing bracket along the outer periphery of the central positioning hole. The end face of the step is the flange connection face. The end face of the step is provided with a plurality of threaded holes, which are distributed in a circular array with the axis of the central positioning hole as the center.

[0010] The beneficial effects of this utility model are: 1) This utility model fixes the scissor gear pair teeth by fixing the teeth on each flange of the gear fixing bracket. By turning the torque sensor with the handle, the gear fixing bracket drives the pair teeth to rotate, so that the pair teeth rotate relative to the main teeth to compress the internal spring of the scissor gear. The elastic force of the internal spring triggers the torque change at the force-bearing end of the static torque sensor, thereby accurately collecting the elastic force data of the internal spring of the scissor gear.

[0011] 2) The fixed teeth on the gear fixing bracket face the axis of the central positioning hole. Their telescopic movement is adjusted by the thread, and the conical structure at the end can be smoothly inserted into the tooth groove of the corresponding position of the auxiliary tooth. Several fixed teeth simultaneously lock the tooth grooves of the main and auxiliary teeth at different positions to achieve the fixing of the auxiliary tooth. Attached Figure Description

[0012] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, wherein: Figure 1 This is a perspective view of the overall structure of this utility model; Figure 2 This is a perspective view of the gear fixing bracket in this utility model from the frontal angle; Figure 3 This is a perspective view of the gear fixing bracket in this utility model from the rear view. Attached image labels: 1-Gear fixing bracket, 2-Static torque sensor, 11-Center positioning hole, 12-Support foot, 13-Flange, 14-Fixing tooth, 15-Step, 16-Flange connection surface, 21-Handle. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a central component. When a component is described as "connected to" another component, it can be directly connected to the other component or may have a central component. When a component is described as "set on" another component, it can be directly set on the other component or may have a central component. When a component is described as "set in the middle," it is not simply set in the exact center, as long as it is not set within the area defined by both ends being in the middle. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0015] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0016] Reference Figures 1 to 3As shown, a scissor gear preload measuring device includes a gear fixing bracket 1 and a static torque sensor 2; the gear fixing bracket 1 is provided with a central positioning hole 11; the gear fixing bracket 1 extends outward along the radial direction of the central positioning hole 11 to form a plurality of support legs 12, the plurality of support legs 12 are arranged in a circular array at equal angles with the axis of the central positioning hole 11 as the center, and the outermost end of each support leg 12 extends to one side in the axial direction of the central positioning hole 11 to form a flange 13. Each flange 13 has an inner surface that is an arc surface centered on the axis of the central positioning hole 11. Each flange 13 is provided with a fixing tooth 14 that is adjustable for telescopic movement in the direction of the axis of the central positioning hole 11. The telescopic adjustment function of the fixing tooth 14 and the flange 13 can be achieved by a threaded connection. The fixing tooth 14 is a fixing screw. Each flange 13 is provided with a threaded hole, the axis of which is oriented towards the axis of the central positioning hole 11. The fixing screw is threadedly connected to a corresponding flange 13 along the axis of the central positioning hole 11. The end of the fixing screw facing the axis of the central positioning hole is a conical structure. The telescopic movement of the fixing tooth 14 on the gear fixing bracket 11 is adjusted by the thread in the direction of the axis of the central positioning hole 11. The conical structure at the end can be smoothly inserted into the tooth groove at the corresponding position of the auxiliary tooth. Several fixing teeth 14 simultaneously lock the tooth grooves at different positions of the auxiliary tooth to achieve the fixing of the auxiliary tooth by the gear fixing bracket 1. One side of the gear fixing bracket 1 is provided with a flange connection surface 16, and the other side of the gear fixing bracket is provided with a step 15 protruding outward along the outer periphery of the central positioning hole. The end face of the step 15 is the flange connection surface 16, and the end face of the step is provided with a plurality of threaded holes 18, which are distributed in a circular array with the axis of the central positioning hole 11 as the center. The force-bearing end of the static torque sensor 2 is fixedly connected to the flange connection surface 12, and the other end of the static torque sensor 2 is fixedly connected to a handle 21. The shell of the conventional static torque sensor 2 is made of steel. The handle 21 can be fixed to the static torque sensor 2 by means of shaft-hole interference fit or welding. The signal output end of the static torque sensor 2 is connected to an external data acquisition instrument. This invention uses the fixing teeth 14 on each flange 13 of the gear fixing bracket 1 to fix the secondary teeth of the scissor gear. By twisting the static torque sensor 2 through the handle 21, the secondary teeth are driven to rotate through the gear fixing bracket 1, so that the secondary teeth and the main teeth rotate relative to each other to compress the internal spring of the scissor gear. The elastic force of the internal spring triggers the torque change at the force-bearing end of the static torque sensor, thereby accurately collecting the elastic force data of the internal spring of the scissor gear.

[0017] In this embodiment, the gear fixing bracket 1 is made of steel. The number of support legs 12 is three, and correspondingly, the number of flanges 13 and fixing teeth 14 is also three. In use, the flange of the gear fixing bracket is aligned with the scissor gear, the central positioning hole is aligned with the gear shaft of the scissor gear, and the bracket is fitted onto the scissor gear. The flange is fitted onto the scissor gear, and the fixing screw is aligned with the secondary tooth of the scissor gear. The fixing teeth 14 are rotated so that each fixing tooth engages with the groove between the corresponding two tooth tips of the secondary tooth, thereby locking and fixing the secondary tooth with the gear fixing bracket 1. After the scissor gear removes the limiting pin, the relative angular displacement between the main gear and the auxiliary gear will be affected by the elastic force of the internal spring. Since the crankshaft timing gear is fixed during engine installation, the main gear of the scissor gear meshes with the crankshaft timing gear, and the main gear is fixed. The operator can rotate the device by holding the handle 21 and rotating the static torque sensor 2, which in turn drives the auxiliary gear to rotate slightly relative to the main gear through the gear fixing bracket 1 until the auxiliary gear of the scissor gear is aligned with the main gear, thereby compressing the internal spring of the scissor gear. After pausing for 1 to 2 seconds, the auxiliary gear is allowed to return to its initial position. The torque data collected by the static torque sensor 2 is recorded by the data acquisition instrument, and the elastic force data of the internal spring of the scissor gear is calculated. The operation is repeated many times, and the average value of the torque under stable conditions is taken as the preload result of the scissor gear.

[0018] The above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the scope of the technical solution of this utility model.

Claims

1. A scissor gear preload measuring device, characterized in that, The device includes a gear mounting bracket and a static torque sensor. The gear mounting bracket has a central positioning hole. Several flanges extend axially from the outer periphery of one side of the gear mounting bracket toward the central positioning hole. The flanges are circumferentially distributed around the axis of the central positioning hole, and each flange has a fixed tooth for telescopic adjustment in the axial direction of the central positioning hole. The other side of the gear mounting bracket has a flange connection surface. The force-bearing end of the static torque sensor is fixedly connected to the flange connection surface, and the other end of the static torque sensor is fixedly connected to a handle.

2. The scissor gear preload measuring device according to claim 1, characterized in that, The fixing tooth is a fixing screw, which is threaded to a corresponding flange along the axial direction of the central positioning hole. The end of the fixing screw facing the axial direction of the central positioning hole is a conical structure.

3. The scissor gear preload measuring device according to claim 2, characterized in that, The gear fixing bracket extends radially outward along the central positioning hole to form several support legs. The support legs are arranged in a circular array with the axis of the central positioning hole as the center. The outermost end of each support leg extends to one side in the direction of the axis of the central positioning hole to form the flange.

4. The scissor gear preload measuring device according to claim 3, characterized in that, The inner surface of each flange is an arc surface centered on the axis of the central positioning hole.

5. The scissor gear preload measuring device according to claim 3, characterized in that, On the other side of the gear fixing bracket, a step is protruding outward along the outer periphery of the central positioning hole. The end face of the step is the flange connection face. The end face of the step is provided with a plurality of threaded holes, which are arranged in a circular array with the axis of the central positioning hole as the center.

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