Crank arm spline detection device
By designing a spline detection device for the crooked arm, measuring the height difference of the crooked arm and calculating the skewed angle, the problem of difficulty in detecting the parallelism of the crooked arm in the prior art is solved, and fast and accurate detection and product stability are achieved Run.
Patent Information
- Application Number
- CN202420367509.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-28
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-02-28
AI Technical Summary
The prior art is difficult to quickly and accurately detect the parallelism of the spline splines, resulting in unstable operation of the spline shaft, resulting in vibration and noise, and easy to be damaged, but it is difficult for the naked eye to observe whether it is skewed.
A spline detection device for the crooked arm is designed, including a horizontal workbench, a height ruler and a placement block. By setting the cog grooves on the placement block correspond to the spline key teeth, and using the height ruler to measure the height difference of the crooked arm twice. Calculate the skew angle of the crooked arm to judge whether the product is qualified.
It realizes rapid and accurate detection of the skewness of the crooked arm splines, ensures the smooth operation of the product and extends the service life, and avoids processing errors that are difficult to observe with the naked eye.
Smart Images
Figure CN222460570U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of detection, in particular to a crank arm spline detection device. Background Art
[0002] Spline is a common transmission element, usually used to transmit torque and rotational motion. It consists of a series of key teeth, each of which has a fixed axial position and can be used in conjunction with another spline. The crank arm spline is a special spline structure that achieves rotational torque transmission by setting a crank arm on the spline shaft. Compared with ordinary splines, the crank arm spline has higher load-bearing capacity and lower friction resistance, so it is suitable for occasions that require large torque transmission and high load.
[0003] Splines are important structures for connection, transmission and homing. If the spline precision is not high, the engagement force between the shaft and the sleeve will be uneven, which may cause problems such as poor mechanical assembly, unstable rotation or vibration. The parallelism of the crank arm spline needs to be ensured. A skewed crank arm will cause the spline shaft to run unsteadily, generate vibration and noise, and be easily damaged. However, it is difficult to observe whether some crank arm splines produced by processing are skewed with the naked eye. Utility Model Content
[0004] In view of the technical problems of the prior art, the utility model provides a crank arm spline detection device.
[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:
[0006] A crank arm spline detection device comprises: a horizontal workbench, a height gauge, and a placement block; the height gauge is horizontally placed on the horizontal workbench; the placement block is horizontally placed on the horizontal workbench; the placement block comprises: a tooth groove; the tooth groove corresponds to the key teeth of the crank arm spline; the height gauge is horizontally placed on the horizontal workbench; the height gauge can move horizontally on the horizontal workbench.
[0007] Furthermore, the height gauge includes: a probe, a ruler body, and a base; the probe sleeve is arranged on the ruler body; the probe can move vertically relative to the ruler body; the ruler body is provided with scales; the base is placed horizontally on a horizontal workbench; the end of the probe away from the ruler body can be placed on the crank arm spline to measure the height of the placement location from the horizontal workbench.
[0008] Furthermore, it also includes a fixing rod; fixing holes are relatively opened on the horizontal workbench; one end of the fixing rod is provided with a thread, and the other end corresponds to the fixing hole; a screw hole is opened on the side of the base away from the measuring head; the screw hole corresponds to the screw thread.
[0009] Furthermore, the placement block also includes a horizontal plate; the horizontal plate is horizontally placed on the horizontal workbench; the horizontal plate is symmetrical relative to the tooth groove; the horizontal plate is a rectangular parallelepiped, wherein the surface surrounded by the width and the height is the interference surface.
[0010] The beneficial effect of the utility model is that by providing a tooth groove corresponding to the spline, when the spline is placed in the tooth groove at a certain position, the normal crank arm should be horizontal, and the height difference of the crank arm when it is placed forward and backward twice can be measured by a height gauge, so as to obtain the degree of skewness of the crank arm spline, so as to judge whether the product is qualified. A fixing rod and a screw hole and a fixing hole corresponding thereto are also provided, so that the horizontal distance of the two height measurement points only needs to be measured once, and there is no need to measure the horizontal distance again when measuring other products later. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 : A schematic diagram of the structure of the utility model;
[0012] Figure 2 : Schematic diagram of the structure of the fixed rod and the height gauge;
[0013] Figure 3 : Structural diagram of crank arm spline;
[0014] Figure 4 : Plane diagram of two measurements of the crank arm height;
[0015] Figure 5 : Schematic diagram for calculating the skew angle.
[0016] In the figure: 1. horizontal workbench; 11. fixing hole; 2. height gauge; 21. measuring head; 22. ruler body; 23. base; 231. screw hole; 3. placement block; 31. tooth groove; 32. horizontal plate; 321. contact surface; 4. fixing rod; 41. thread. DETAILED DESCRIPTION
[0017] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.
[0018] according to Figure 1-5 The utility model provides a crank arm spline detection device, comprising: a horizontal workbench 1, a height ruler 2, a placement block 3, and a fixing rod 4.
[0019] The placement block 3 is placed horizontally on the horizontal workbench 1. The placement block 3 includes a tooth groove 31. The tooth groove 31 corresponds to the key teeth of the crank arm spline. The height gauge 2 is placed horizontally on the horizontal workbench 1 so that the height of the crank arm spline can be measured after the crank arm spline is placed in the placement block 3. The height gauge 2 can move horizontally on the horizontal workbench 1.
[0020] The key teeth of the crank arm spline are arranged on the spline shaft in a certain arrangement, and the spline shaft is connected to the crank arm in a certain way, so that the key teeth and the crank arm form a certain positional relationship, that is, when the key teeth are in a certain position (hereinafter referred to as upright for convenience of explanation), the crank arm is in a horizontal state. The utility model has a tooth groove 31 on the placement block 3, so that the spline shaft can be placed in, and the key teeth can just be placed upright into the clamping notch. At this time, the crank arm spline is upright and fixed on the placement block 3, and the crank arm should be in a horizontal state. At this time, the height of the crank arm is measured by the height gauge 2 on the side of the placement block 3 close to the crank arm. Then take out the crank arm spline and rotate it 180° around the spline shaft. Since the key teeth and the tooth grooves 31 are symmetrical, the key teeth can still be placed in the tooth grooves 31 after rotating 180°. At this time, the crank arm turns from one side of the placement block 3 to the other side, and if the crank arm spline is qualified, the crank arm should still be horizontal. Then move the height gauge 2 to the side of the placement block 3 close to the crank arm, and then measure the height of the crank arm. The height difference between the two measurements can be used to check whether the crank arm spline is skewed.
[0021] like Figure 4 , Figure 5 As shown in the figure, the first measurement point of the height gauge is set as A, the second measurement point is set as B, and the center position of the spline is set as point C. By obtaining the horizontal distance A"C" (L1) between point A and point C, the horizontal distance B"C" (L2) between point B and point C, and then obtaining the height difference between point A and point B (BB"-AA"=H), the following can be obtained: Figure 5 The triangle shown can be used to obtain the skew angle α of the crank arm through trigonometric functions, and the skew degree of the crank arm spline can be determined.
[0022] The height gauge 2 includes: a probe 21, a ruler body 22, and a base 23. The probe 21 is mounted on the ruler body 22. The probe 21 can move vertically relative to the ruler body 22. The lower bottom surface of the probe 21 is parallel. The ruler body 22 is provided with a scale. The base 23 is horizontally placed on the horizontal workbench 1 and can move horizontally relative to the horizontal workbench 1. The end of the probe 21 away from the ruler body 22 can be placed on the crank arm spline to measure the height of the placement from the horizontal workbench 1. When measuring, keep the probe 21 at the highest point of the height gauge 2, move the base 23 so that the height gauge 2 is close to the crank arm, and put the probe 21 down so that it hits the crank arm. Since the lower bottom surface of the probe 21 is horizontal, the reading is taken from the lower bottom surface of the position where the probe 21 is mounted on the ruler body 22. The obtained reading is the height of the place where the probe 21 hits the crank arm.
[0023] The horizontal workbench 1 has fixing holes 11 opposite to each other. One end of the fixing rod 4 is provided with a thread 41, and the other end corresponds to the fixing hole 11. The base 23 is symmetrical with respect to the probe 21. A screw hole 231 is provided on the side of the base 23 away from the probe 21. The screw hole 231 corresponds to the thread 41. The placement block 3 also includes a horizontal plate 32. The horizontal plate 32 is symmetrical with respect to the tooth groove 31. The horizontal plate 32 is horizontally placed on the horizontal workbench 1. The horizontal plate 32 is a rectangular parallelepiped, in which the surface enclosed by the width and the height is the interference surface 321, that is, the number of the interference surfaces 321 is two.
[0024] In the above method, the horizontal distance between points A and B needs to be measured, which is troublesome to measure every time. The utility model is provided with a fixing rod 4, on which a thread 41 is provided, and a fixing hole 11 and a screw hole 231 corresponding to the fixing rod 4 are opened, so that after the thread 41 is screwed into the screw hole 231, the fixing rod 4 can be fixed to the height gauge 2, and then the end of the fixing rod 4 without the thread 41 is passed into the fixing hole 11, so that the height gauge 2 can be fixed on both sides of the top surface of the horizontal workbench 1. At this time, the contact surface 321 of the placement block 3 is in contact with the height gauge 2, and the height of the crank arm is measured. Figure 4 , Figure 5 As shown in FIG. 1 , since the base 23 is symmetrical with respect to the probe 21 and the horizontal plate 32 is symmetrical with respect to the tooth groove 31, the distance between the center point of the tooth groove 31 and the two measurement positions is the same (i.e., L1=L2), which is the horizontal length along the crank arm direction from the center point of the base 23 to the center point of the horizontal plate 32 when the contact surface 321 contacts the base 23, i.e., A"C" or B"C". Therefore, in Figure 5 (L1+L2) is the length of the end of the base 23 away from the horizontal plate 32 along the crank arm direction (hereinafter referred to as the horizontal distance for the convenience of explanation) when the contact surface 321 contacts the base 23. Thus, the horizontal distance is measured once, and then each time the crank arm spline is detected, only the heights in the above method need to be measured twice to obtain the crank arm skew angle.
[0025] The working principle and use process of this utility model:
[0026] When the utility model is in use, the horizontal spacing is measured, and then the end of the fixing rod 4 with the thread 41 is screwed into the screw hole 231 of the height gauge 2, and then the end of the fixing rod 4 away from the thread 41 is put into the fixing hole 11 of the horizontal workbench 1, so that the height gauge 2 is fixed on the horizontal workbench 1, and at this time, the key teeth of the crank arm spline are put into the tooth groove 31, so that the crank arm spline is fixed, and the probe 21 is lifted to the highest point of the height gauge 2, so that the contact surface 321 of the horizontal plate 32 contacts the base 23, and the probe 21 is lowered to contact with the crank arm, so that the height of the contact point is measured, and the height gauge 2 is placed in another opposite fixing hole 11, and at the same time, the crank arm spline is taken out, and the crank arm spline is rotated 180° around the spline axis, and then put into the tooth groove 31, and then the other contact surface 321 contacts the base 23, and then the measurement is performed according to the above method. After the measurement is completed, the skew angle can be obtained according to the known data and trigonometric functions to judge whether it can be put into use.
[0027] In addition, the present invention measures the skew of the spline caused by processing, which is difficult to observe with the naked eye. In actual operation, when the spline is not placed straight, the skew is caused by the crooked placement of the key teeth. At this time, the skew angle is much larger than α. This deviation is easy to observe with the naked eye and can be quickly adjusted manually. Therefore, this error cannot interfere with the measurement accuracy of the present invention.
[0028] In summary, the utility model sets tooth grooves corresponding to the crank arm splines so that the crank arm should be horizontal when the splines are placed upright, so as to judge whether it is skewed, and measures twice with a height ruler to obtain the height difference, so that it can be determined whether the crank arm splines are skewed.
[0029] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.
Claims
1. A crank arm spline detection device, characterized in that: include: A horizontal workbench (1), a height gauge (2), and a placement block (3); The placement block (3) is placed horizontally on the horizontal workbench (1); The placement block (3) comprises: a tooth groove (31); The tooth groove (31) corresponds to the key teeth of the crank arm spline; The height ruler (2) is placed horizontally on the horizontal workbench (1); The height gauge (2) can move horizontally on the horizontal workbench (1).
2. A crank arm spline detection device as claimed in claim 1, characterized in that: The height gauge (2) comprises: a measuring head (21), a gauge body (22), and a base (23); The measuring head (21) is sleeved on the ruler body (22); The measuring head (21) can move vertically relative to the ruler body (22); The ruler body (22) is provided with scales; The base (23) is placed horizontally on the horizontal workbench (1); The end of the measuring head (21) away from the ruler body (22) can be placed on the crank arm spline to measure the height of the placement position from the horizontal workbench (1).
3. A crank arm spline detection device as claimed in claim 2, characterized in that: Also includes a fixing rod (4); The horizontal workbench (1) is provided with fixing holes (11) opposite to each other; One end of the fixing rod (4) is provided with a thread (41), and the other end corresponds to the fixing hole (11); A screw hole (231) is formed on a side of the base (23) away from the measuring head (21); The screw hole (231) corresponds to the screw thread (41).
4. A crank arm spline detection device as claimed in claim 3, characterized in that: The placement block (3) further comprises a horizontal plate (32); The horizontal plate (32) is placed horizontally on the horizontal workbench (1); The horizontal plate (32) is symmetrical with respect to the tooth groove (31); The horizontal plate (32) is a rectangular parallelepiped, wherein the surface enclosed by the width and the height is the contact surface (321).