Gear bending fatigue test tool

Abstract

The utility model provides a gear bending fatigue test tool, which comprises a base, a supporting seat, a lower ejector block and an upper ejector block, and is characterized in that the base is mounted on a working platform of a testing machine; the two supporting seats are symmetrically arranged on the base, a supporting shaft is arranged between the two supporting seats, each supporting seat comprises a support and a lock catch, the lock catches are installed at the tops of the supports, and the two ends of the supporting shaft are arranged between the supports on the two sides and the lock catches respectively; the lower ejector block is fixed on the base and located on the same side of the two supporting seats, the lower ejector block comprises a supporting surface and a lower avoiding groove, the upper ejector block is installed on an upper lathe bed of the testing machine and vertically corresponds to the lower ejector block, and the upper ejector block comprises a lower pressing surface and an upper avoiding groove. The upper ejector block, the lower ejector block and the supporting seat are all detachable, and in actual use, the test tooth surface is rapidly replaced and the position of the gear teeth of the gear is adjusted by detaching the lower ejector block and rotating the gear, so that the test period is shortened, and the test efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gear testing devices, in particular to a gear bending fatigue testing tool. Background Art

[0002] Gear bending fatigue failure is a common form of gear failure. During operation, a gear tooth acts like a cantilever beam. Under the action of normal forces acting on the tooth surface, bending stresses are generated at the tooth root. Under the influence of cyclically varying bending stresses, cracks often first appear at the tooth root, where stress concentration is greatest. Cracks continue to propagate, and when the effective load-bearing cross-section is insufficient to support the normal load, the entire tooth, or part of it, can suddenly fracture. Gear bending fatigue is often difficult to detect during quantitative changes, but once a qualitative change occurs, it can lead to failure of the entire transmission equipment or even a serious accident. Therefore, conducting gear bending fatigue testing is an important means of studying the bending fatigue strength of gears. By conducting bending fatigue testing, a large amount of basic bending fatigue strength data can be rapidly accumulated, providing crucial data support for gear transmission system design. However, existing gear bending fatigue strength testing tooling is cumbersome and difficult to clamp the gear. Furthermore, the position of the gear teeth cannot be quickly adjusted, which increases the test cycle and reduces test efficiency. Furthermore, during the loading process, accurate loading cannot be achieved, resulting in uneven stress on the tooth tips and often inaccurate test results.

[0003] Therefore, it is necessary to provide a gear bending fatigue test fixture to overcome the above-mentioned defects. Utility Model Content

[0004] The utility model aims to provide a gear bending fatigue test tool.

[0005] According to one aspect of the present invention, a gear bending fatigue test fixture is provided, which is installed on a testing machine and includes:

[0006] A base, the base being mounted on a working platform of the testing machine;

[0007] The support base is provided with two support bases, which are symmetrically arranged on the base. A support shaft is provided between the two support bases, and the gear to be tested is rotatably sleeved on the support shaft. The support base includes a bracket and a lock. The bracket is fixed to the base, and the lock is installed on the top of the bracket. The two ends of the support shaft are respectively arranged between the brackets and the lock, and are locked and fixed by the lock;

[0008] A lower top block, fixed on the base and located on the same side of the two support seats, comprising a support surface for supporting the gear teeth of the gear to be tested and a lower avoidance groove for avoiding the remaining gear teeth, wherein the lower avoidance groove is located below the support surface;

[0009] An upper top block is installed on the upper bed of the testing machine and is arranged correspondingly to the lower top block above and below. The upper top block includes a downward pressing surface for pressing down the teeth of the gear to be tested and an upper avoidance groove for avoiding the remaining teeth. The upper avoidance groove is located above the downward pressing surface.

[0010] Preferably, the top of the bracket is provided with a downwardly recessed lower arc groove, the lock buckle is provided with an upwardly recessed upper arc groove, the end of the support shaft is arranged between the upper arc groove and the lower arc groove, and bolts are passed through the radial sides of the upper arc groove to fix the lock buckle on the bracket and lock the support shaft at the same time.

[0011] Preferably, the lower avoidance groove extends horizontally through the lower top block and is located on the side where the support seat is located; the upper avoidance groove extends horizontally through the upper top block and is located on the side where the support seat is located.

[0012] Preferably, the bracket is arranged in an L-shape, including a horizontal plate fixed to the base and a vertical plate supporting the support shaft, and the lower arc groove is arranged on the top of the vertical plate.

[0013] Preferably, the lower top block is arranged in an inverted T shape, including a fixed plate fixed to the base and a support block extending vertically upward from the middle of the fixed plate, the support surface is located at the top of the support block, and the lower avoidance groove is located on the side of the support block.

[0014] Compared with the prior art, the gear bending fatigue test fixture provided by the present invention has the following beneficial effects:

[0015] Due to the adoption of the above technical solution, the utility model has the advantages of simple structure, ingenious design and low cost. The upper top block, the lower top block and the support seat are all detachable. In actual use, by removing the lower top block and rotating the gear, the test tooth surface can be quickly replaced and the position of the gear teeth can be adjusted, so that the test cycle is shortened and the test efficiency is improved. During the loading process, the loading can be carried out accurately and the force on the tooth top is uniform, which greatly improves the accuracy of the test results. At the same time, the test is carried out by using this tooling so that the connection between the whole tooling, the gear and the testing machine is closer and tighter. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0017] Figure 1 This is a working state diagram of the gear bending fatigue test fixture of the present utility model;

[0018] Figure 2 This is a three-dimensional diagram of the gear bending fatigue test fixture of the present invention;

[0019] Figure 3This is a side view of the gear bending fatigue test fixture of the present invention;

[0020] Figure 4 This is a partial three-dimensional view of the gear bending fatigue test tool of the utility model. Figure 1 ;

[0021] Figure 5 This is a partial three-dimensional view of the gear bending fatigue test tool of the utility model. Figure 2 .

[0022] Among them, a. testing machine, a1. working platform, a2. upper bed, b. gear to be tested, 100. bending fatigue test fixture, 1. base, 2. support seat, 21. bracket, 211. lower arc groove, 212. horizontal plate, 213. vertical plate, 22. lock, 221. upper arc groove, 3 support shaft, 4. lower top block, 41. support surface, 42. lower avoidance groove, 43. fixing plate, 44. support block, 5. upper top block, 51. lower pressure surface, 52. upper avoidance groove. DETAILED DESCRIPTION

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0024] To simplify the drawings, only the parts relevant to the present invention are schematically shown in each figure. They do not represent the actual structure of the product. In addition, to simplify the drawings and facilitate understanding, in some figures, only one of the components with the same structure or function is schematically depicted or labeled. In this document, "one" not only means "only one" but also "more than one."

[0025] It should be further understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0026] It should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0027] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without inventive work.

[0029] See also Figure 1 and Figure 2 This embodiment discloses a gear bending fatigue test fixture, which is mounted on a testing machine a to secure and load a gear b under test. The test fixture comprises a base 1, a support base 2, a lower ejector block 4, and an upper ejector block 5. The base 1 is mounted on a working platform a1 of the testing machine a. Two symmetrically arranged support bases 2 are fixed to the base 1. A support shaft 3 is positioned between the support bases 2, and the gear b under test is rotatably mounted on the support shaft 3.

[0030] See also Figure 4 The support seat 2 includes a bracket 21 and a lock 22. The bracket 21 is fixed to the base 1, and the lock 22 is installed on the top of the bracket 21. The bracket 21 is L-shaped and includes a horizontal plate 212 fixed to the base 1 and a vertical plate 213 supporting the support shaft 3. The top of the vertical plate 213 is provided with a downwardly concave lower arc groove 211, and the lock 22 is provided with an upwardly concave upper arc groove 221. The two ends of the support shaft 3 are respectively arranged between the bracket 21 and the lock 22 on both sides. Furthermore, the end of the support shaft 3 is arranged between the upper arc groove 221 and the lower arc groove 211, and is vertically penetrated by bolts on both sides of the horizontal radial direction of the upper arc groove 221, thereby fixing the lock 22 on the vertical plate 213 while locking the support shaft 3.

[0031] See also Figure 3 and Figure 5 , the lower top block 4 is fixed on the base 1 and is located on the same side of the two support seats 2. The lower top block 4 is arranged in an inverted T shape, including a fixed plate 43 fixed to the base 1 and a support block 44 extending vertically upward from the middle of the fixed plate 43. The support block 44 is arranged opposite to the gap between the two vertical plates 213. The support block 44 is provided with a support surface 41 for supporting the teeth of the gear b to be tested and a lower avoidance groove 42 for avoiding the remaining teeth. The support surface 41 is located at the top of the support block 44, and the lower avoidance groove 42 is located below the support surface 41. The lower avoidance groove 42 extends horizontally through the support block 44 and is located on the side where the support seat 2 is located.

[0032] The upper ejector block 5 is mounted on the upper bed a2 of the testing machine a and is positioned vertically opposite the lower ejector block 4. The upper ejector block 5 includes a downward pressing surface 51 for pressing down on the teeth of the gear b to be tested, and an upper relief groove 52 for circumventing the remaining teeth. The upper relief groove 52 is located above the downward pressing surface 51. The upper relief groove 52 extends horizontally through the upper ejector block 5 and is located on the side of the support base 2.

[0033] Working principle: See Figure 1 and Figure 3 When in use, install the base 1 on the working platform a1 of the testing machine a, then install the support base 2 and the lower top block 4 on the base 1, and then place the support shaft 3 with the gear b to be tested on the bracket 21 of the support base 2. After the tooth surface of the gear tooth is supported on the support surface 41 of the lower top block 4 and positioned, lock the support shaft 3 with the lock buckle 22. The upper bed a2 of the testing machine a clamps the upper top block 5 and presses it on the loading tooth surface. After preparation, start the test.

[0034] The upper top block 5, the lower top block 4 and the support seat 2 can all be disassembled. When changing teeth, the lower top block 4 is removed, the gear b to be tested is rotated to the next loading tooth, and then the lower top block 4 is reinstalled and the test is repeated. It is convenient for disassembly and assembly, and the gear changing process is simple and quick.

[0035] It will be apparent to those skilled in the art that various modifications and variations can be made to the exemplary embodiments described above without departing from the spirit and scope of the present invention. Therefore, it is intended that the present invention cover modifications and variations of the present invention that fall within the scope of the appended claims and their equivalents.

Claims

1. A gear bending fatigue test fixture, which is installed on a testing machine and is characterized by: include: A base, the base being mounted on a working platform of the testing machine; The support base is provided with two support bases, which are symmetrically arranged on the base. A support shaft is provided between the two support bases, and the gear to be tested is rotatably sleeved on the support shaft. The support base includes a bracket and a lock. The bracket is fixed to the base, and the lock is installed on the top of the bracket. The two ends of the support shaft are respectively arranged between the brackets and the lock, and are locked and fixed by the lock; A lower top block, fixed on the base and located on the same side of the two support seats, comprising a support surface for supporting the gear teeth of the gear to be tested and a lower avoidance groove for avoiding the remaining gear teeth, wherein the lower avoidance groove is located below the support surface; An upper top block is installed on the upper bed of the testing machine and is arranged correspondingly to the lower top block above and below. The upper top block includes a downward pressing surface for pressing down the teeth of the gear to be tested and an upper avoidance groove for avoiding the remaining teeth. The upper avoidance groove is located above the downward pressing surface.

2. The gear bending fatigue test fixture according to claim 1, characterized in that: The top of the bracket is provided with a downwardly concave lower arc groove, and the lock buckle is provided with an upwardly concave upper arc groove. The end of the support shaft is arranged between the upper arc groove and the lower arc groove, and is penetrated by bolts on both radial sides of the upper arc groove, thereby fixing the lock buckle on the bracket and locking the support shaft at the same time.

3. The gear bending fatigue test fixture according to claim 2, characterized in that: The lower avoidance groove extends horizontally through the lower top block and is located on the side where the support seat is located; the upper avoidance groove extends horizontally through the upper top block and is located on the side where the support seat is located.

4. The gear bending fatigue test fixture according to claim 2, characterized in that: The bracket is arranged in an L-shape, comprising a horizontal plate fixed to the base and a vertical plate supporting the support shaft, and the lower arc groove is arranged on the top of the vertical plate.

5. The gear bending fatigue test fixture according to claim 1, characterized in that: The lower top block is arranged in an inverted T shape, including a fixing plate fixed to the base and a support block extending vertically upward from the middle of the fixing plate. The support surface is located at the top of the support block, and the lower avoidance groove is located on the side of the support block.

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