Interdental gap measuring jig

Abstract

The application provides a gear clearance measuring tool, which comprises a tensioning part and a measured part. The tensioning part is arranged in the shaft hole of a differential gear and is tensioned in the shaft hole. The measured part is connected with the tensioning part, and the measured part is used to contact with the measuring head of a dial gauge, and the measured part is also used to drive the tensioning part to rotate. The application solves the problems of long time consumption and high equipment cost of the existing gear clearance measuring device.

Description

Technical Field

[0001] This application relates to the technical field of measuring fixtures, and in particular to a tooth gap measuring fixture. Background Technology

[0002] Backlash, the space between teeth in a gear transmission, is crucial for ensuring smooth operation, reducing wear, and extending the lifespan of gear pairs. Measuring the backlash of hypoid gears in automotive final drive systems requires locking the differential gear at the differential end and measuring the backlash angle by rotating the gear shaft clockwise and counterclockwise. This requires an additional worktable, resulting in time-consuming setup and high equipment costs. Therefore, existing backlash measurement devices suffer from the problems of time-consuming setup and high equipment costs. Utility Model Content

[0003] The purpose of this application is to provide a tooth gap measuring fixture to solve the problems of long setup time and high equipment cost of existing tooth gap measuring devices.

[0004] This application provides a gear backlash measurement fixture, including a tensioning component and a test piece. The tensioning component is used to be fitted into the shaft hole of a differential gear and tensioned within the shaft hole. The test piece is connected to the tensioning component, and the test piece is used to contact the measuring head of a dial indicator. The test piece is also used to drive the tensioning component to rotate.

[0005] Optionally, the tensioning component includes a shaft, a tension sleeve, a main body, a stop member, and a nut. The shaft includes a stop groove. The tension sleeve is sleeved on the shaft and is used to fit into the shaft hole. The shaft passes through the main body, the test piece is connected to the main body, and the tension sleeve abuts against the main body. The stop member passes through the main body and abuts against the stop groove. The nut is screwed to the shaft, and when the nut rotates, it causes the shaft to tension the tension sleeve in the shaft hole.

[0006] Optionally, the shaft includes a pushing cone surface, the main body includes a stopping cone surface, the expansion sleeve is sleeved on the pushing cone surface and the stopping cone surface, and the pushing cone surface and the stopping cone surface are spaced apart.

[0007] Optionally, the shaft includes a first shaft segment and a second shaft segment, the first shaft segment and the second shaft segment are connected, the diameter of the first shaft segment is larger than the diameter of the second shaft segment, and the second shaft segment and the main body are spaced apart.

[0008] Optionally, the stop groove is provided on the second shaft segment.

[0009] Optionally, the tensioning component further includes a thrust ball bearing, which is sleeved on the second shaft section and abuts against the main body and the nut.

[0010] Optionally, the main body includes a first hole segment and a second hole segment, the first hole segment and the second hole segment are connected, the diameter of the first hole segment is smaller than the diameter of the second hole segment, the first shaft segment passes through the first hole segment, and the second shaft segment passes through the second hole segment and is spaced apart from the second hole segment.

[0011] Optionally, the nut includes a groove, and one end of the body is fitted into the groove.

[0012] Optionally, the tensioning component further includes a thrust ball bearing, which is embedded in the main body, sleeved on the shaft, and abuts against the nut.

[0013] Optionally, there may be multiple test pieces, which are evenly distributed on the tensioning component.

[0014] The beneficial effects of this application are as follows: by setting up a tensioning component and a test piece. The tensioning component is used to be fitted into the shaft hole of the differential gear and tensioned within the shaft hole. The test piece is connected to the tensioning component, and the test piece is used to contact the measuring head of the dial indicator, and the test piece is also used to drive the tensioning component to rotate.

[0015] Because the tensioning component can be embedded in and tensioned within the shaft hole of the differential gear, the workpiece under test can drive the tensioning component to rotate, which in turn drives the differential gear to rotate. The rotational radian of the workpiece under test is then measured using a dial indicator, and the tooth clearance between the differential gear and the gear shaft can be calculated from this radian. This method of tooth clearance measurement eliminates the need for an additional workbench, reduces the time required for tooling setup, and lowers equipment costs.

[0016] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, the following describes the application in detail with reference to the preferred embodiments and accompanying drawings. Attached Figure Description

[0017] Figure 1 This is a schematic cross-sectional view of the application of a tooth clearance measuring fixture in one embodiment of this application (only a portion of the gear shaft is shown, and the dial indicator is omitted);

[0018] Figure 2 This is a schematic left view of the application of a tooth clearance measuring fixture in one embodiment of this application (the dial indicator only shows a portion of the measuring head, omitting the gear shaft and differential gear);

[0019] Figure 3This is a perspective view of the expansion sleeve in one embodiment of this application;

[0020] Figure 4 This is a perspective view of a tooth gap measuring fixture in one embodiment of this application;

[0021] Figure 5 This is a cross-sectional view of the main body in one embodiment of this application;

[0022] Figure 6 This is a cross-sectional view of the shaft in one embodiment of this application;

[0023] Figure 7 This is a cross-sectional view of a nut in one embodiment of this application.

[0024] In the attached figures, the following labels are used:

[0025] 1. Tensioning component

[0026] 10 axes

[0027] 100 stop groove

[0028] 101 Pushing Cone Surface

[0029] 102 First Axle Segment

[0030] 103 Second Axle Section

[0031] 11. Price Increase / Loss

[0032] 12 main body

[0033] 120 stop cone surface

[0034] 121 First Hole Section

[0035] 122 Second Hole Section

[0036] 123 Countersunk Hole

[0037] 124 screw hole

[0038] 13 Stop components

[0039] 14 Nuts

[0040] 140 groove

[0041] 15 Thrust ball bearing

[0042] 2 Test Components

[0043] 3. Differential gear

[0044] 4. Gear Shaft

[0045] 5. Measuring head Detailed Implementation

[0046] The following specific embodiments illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification.

[0047] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present application will now be described in detail with reference to the accompanying drawings and embodiments. To enable those skilled in the art to better understand the solutions of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application.

[0048] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products, or devices.

[0049] It should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0050] Please also refer to Figure 1 and Figure 2 This embodiment provides a tooth clearance measuring fixture, including a tensioning component 1 and a test piece 2. The tensioning component 1 is used to be fitted into the shaft hole of the differential gear 3 and tensioned within the shaft hole. The test piece 2 is connected to the tensioning component 1, and the test piece 2 is used to contact the measuring head 5 of the dial indicator. The test piece 2 is also used to drive the tensioning component 1 to rotate.

[0051] Please also refer to Figure 1 and Figure 2Since the tensioning component 1 can be embedded in and tensioned within the shaft hole of the differential gear 3, the test piece 2 can drive the tensioning component 1 to rotate, which in turn drives the differential gear 3 to rotate. The rotational radian of the test piece 2 is then measured using a dial indicator, and the tooth clearance between the differential gear 3 and the gear shaft 4 can be calculated from this radian. This method of tooth clearance measurement eliminates the need for an additional workbench, reduces the time required for tooling setup, and lowers equipment costs.

[0052] Please also refer to Figure 1 and Figure 2 The specific structure of the tensioning component 1 is described in the following description of the embodiment. The left end of the tensioning component 1 is embedded in the shaft hole of the differential gear 3. The shaft hole of the differential gear 3 is the center hole of the differential gear 3. The test piece 2 is preferably rod-shaped and includes multiple planes for contact with the measuring head 5. The test piece 2 is made of steel. The test piece 2 and the tensioning component 1 are preferably connected by welding or screwing. When one end of the tensioning component 1 is tensioned in the shaft hole, rotating the test piece 2 can drive the tensioning component 1 to rotate. The differential gear 3 and the gear shaft 4 mesh, and the tooth clearance is the gap between the teeth of the differential gear 3 and the teeth of the gear shaft 4.

[0053] like Figure 1 As shown, optionally, the tensioning component 1 includes a shaft 10, a tension sleeve 11, a main body 12, a stop 13, and a nut 14. The shaft 10 includes a stop groove 100. The tension sleeve 11 is sleeved on the shaft 10 and is used to be fitted into the shaft hole. The shaft 10 passes through the main body 12, and the test piece 2 is connected to the main body 12, with the tension sleeve 11 abutting against the main body 12. The stop 13 passes through the main body 12 and abuts against the stop groove 100. The nut 14 is screwed to the shaft 10, and when the nut 14 rotates, it causes the shaft 10 to tension the tension sleeve 11 within the shaft hole.

[0054] like Figure 1 As shown, when the nut 14 rotates, it drives the shaft 10 to tighten the expansion sleeve 11 in the shaft hole. No additional tools are needed (such as wrenches or screwdrivers) to tighten the shaft 10 and the expansion sleeve 11, which facilitates the tightening operation.

[0055] Please also refer to Figure 1 and Figure 3 Optionally, the shaft 10 is cylindrical. The shaft 10 is made of steel. The stop groove 100 is preferably an elliptical groove. The stop groove 100 is provided on the side of the shaft 10. The expansion sleeve 11 is fitted onto the left end of the shaft 10 and abuts against the left end of the main body 12. The expansion sleeve 11 is annular and is composed of multiple inverted U-shaped units connected in sequence. The expansion sleeve 11 is made of steel.

[0056] Please also refer to Figure 1 and Figure 4Optionally, the main body 12 is columnar, for example, a polygonal prism. The shaft 10 passes through the main body 12 along its axial direction. The shaft 10 and the main body 12 are preferably coaxial. The bottom end of the test piece 2 is connected to the main body 12 by screwing or welding. The main body 12 is made of steel. The sides of the main body 12 are knurled. The axial direction of the test piece 2 is perpendicular to the axial direction of the main body 12.

[0057] Please also refer to Figure 1 and Figure 5 Optionally, the stop 13 is preferably a stud. The axial direction of the stop 13 is perpendicular to the axial direction of the main body 12. The stop 13 is made of steel. The stop 13 and the test piece 2 are spaced apart. A screw hole 124 is provided on the side of the main body 12, and the bottom end of the stop 13 passes through the screw hole 124 and abuts against the stop groove 100. The diameter of the stop 13 is smaller than the length of the stop groove 100. The stop 13 and the screw hole 124 are screwed together. After the stop 13 abuts against the stop groove 100, it can prevent the shaft 10 from rotating and also prevent the shaft 10 from moving excessively and damaging the expansion sleeve 11.

[0058] like Figure 1 As shown, nut 14 and the right end of shaft 10 are screwed together. Nut 14 is made of steel and has knurled edges. The right end of shaft 10 is threaded to connect with nut 14. When nut 14 rotates, it drives shaft 10 to move to the right. When shaft 10 moves to the right, the expansion sleeve 11 expands radially outward along shaft 10 and abuts against the inner surface of shaft hole. After expansion sleeve 11 abuts against shaft hole, it will not rotate relative to differential gear 3. The degree of tension depends on different test objects; the general principle is that after expansion sleeve 11 is tightened, it can drive differential gear 3 to rotate without slippage. In this embodiment, when the torque of tightening nut 14 is greater than 3 N·m, expansion sleeve 11 is considered to be tightened.

[0059] Please also refer to Figure 1 , Figure 5 and Figure 6 Optionally, the shaft 10 includes a push-up conical surface 101, the main body 12 includes a stop conical surface 120, and an expansion sleeve 11 is fitted onto the push-up conical surface 101 and the stop conical surface 120, with the push-up conical surface 101 and the stop conical surface 120 spaced apart. This arrangement allows both ends of the expansion sleeve 11 to be stretched outward along the radial direction of the shaft 10, which is beneficial for the expansion sleeve 11 and the shaft hole of the differential gear 3 to make full contact. The push-up conical surface 101 is higher on the left and lower on the right. The taper of the push-up conical surface 101 and the taper of the expansion sleeve 11 that mate with it are the same. The stop conical surface 120 is lower on the left and higher on the right. The taper of the stop conical surface 120 and the taper of the expansion sleeve 11 that mate with it are the same.

[0060] Please also refer to Figure 1 and Figure 6Optionally, the shaft 10 includes a first shaft segment 102 and a second shaft segment 103, which are connected. The diameter of the first shaft segment 102 is larger than the diameter of the second shaft segment 103, and the second shaft segment 103 is spaced apart from the main body 12. This arrangement reduces the contact area between the shaft 10 and the main body 12 (i.e., the second shaft segment 103 does not contact the main body 12), reduces the resistance to pulling the shaft 10, and makes the nut 14 easier to tighten.

[0061] Please also refer to Figure 1 and Figure 6 The first shaft segment 102 is located to the right of the portion of the shaft 10 with the pusher cone surface 101. The first shaft segment 102 is a round shaft. The second shaft segment 103 is located to the right of the first shaft segment 102. The second shaft segment 103 and the first shaft segment 102 are integrally machined. The left end of the second shaft segment 103 is connected to the right end of the first shaft segment 102. The second shaft segment 103 and the main body 12 are spaced apart, that is, the second shaft segment 103 and the main body 12 do not contact each other. The second shaft segment 103 is a round shaft.

[0062] Please also refer to Figure 1 and Figure 6 Optionally, the stop groove 100 is provided on the second shaft segment 103. Since the second shaft segment 103 and the main body 12 do not contact each other, the stop groove 100 is provided on the second shaft segment 103, making it easier for the stop groove 100 to rotate to align with the stop member 13.

[0063] like Figure 1 As shown, optionally, the tensioning component 1 also includes a thrust ball bearing 15, which is sleeved on the second shaft section 103 and abuts against the main body 12 and the nut 14. With this configuration, the nut 14 rotates by driving the thrust ball bearing 15 instead of contacting the main body 12, resulting in low friction and easier rotation of the nut 14. Furthermore, because the second shaft section 103 has a small diameter, the inner ring diameter of the fitted thrust ball bearing 15 can also be smaller, making the radial dimensions of the main body 12 more compact.

[0064] like Figure 1 As shown, the bearing race of the thrust ball bearing 15 is fitted onto the second shaft segment 103 and abuts against the right end of the main body 12. The seat race of the thrust ball bearing 15 is fitted onto the second shaft segment 103 and abuts against the left end of the nut 14. The thrust ball bearing 15 and the second shaft segment 103 are fitted with a clearance fit to prevent the thrust ball bearing 15 from obstructing the movement of the shaft 10. The thrust ball bearing 15 separates the nut 14 and the second shaft segment 103.

[0065] Please also refer to Figure 5 and Figure 6Optionally, the main body 12 includes a first hole segment 121 and a second hole segment 122, which are connected. The diameter of the first hole segment 121 is smaller than the diameter of the second hole segment 122. A first shaft segment 102 passes through the first hole segment 121, and a second shaft segment 103 passes through the second hole segment 122 and is spaced apart from it. This arrangement, with a larger diameter for the second hole segment 122 and a smaller diameter for the second shaft segment 103, allows for a larger gap between the second shaft segment 103 and the second hole segment 122, reducing the possibility of collision between the shaft 10 and the main body 12 during assembly and rotation.

[0066] Please also refer to Figure 5 and Figure 6 The first hole segment 121 is a circular hole. The first hole segment 121 is arranged along the axial direction of the main body 12. The first hole segment 121 and the main body 12 are coaxial. The diameter of the first hole segment 121 is approximately the same as the diameter of the first shaft segment 102. The second hole segment 122 is a circular hole, also arranged along the axial direction of the main body 12. The second hole segment 122 and the main body 12 are coaxial. The left end of the second hole segment 122 connects to the right end of the first hole segment 121. After connecting with the first hole segment 121, the second hole segment 122 penetrates the main body 12.

[0067] like Figure 7 As shown, optionally, the nut 14 includes a groove 140, with one end of the body 12 embedded in the groove 140. This arrangement increases the lateral surface area of ​​the nut 14 without increasing its height, making the measuring fixture more compact while providing a larger contact area between the tester's hand and the nut 14, making it easier to rotate the nut 14. The groove 140 is located at the left end of the nut 14. The groove 140 is preferably cylindrical. The right end of the body 12 is embedded in the groove 140.

[0068] Please also refer to Figure 1 and Figure 5 Optionally, the tensioning component 1 also includes a thrust ball bearing 15, which is embedded in the main body 12, sleeved on the shaft 10, and abuts against the nut 14. With this configuration, the nut 14 rotates by driving the thrust ball bearing 15 instead of contacting the main body 12, resulting in low friction and easier rotation of the nut 14. A countersunk hole 123 is provided at the right end of the main body 12, and the thrust ball bearing 15 is embedded in the countersunk hole 123.

[0069] like Figure 1 As shown, optionally, there are multiple test pieces 2, which are evenly arranged on the tensioning component 1. Having multiple test pieces 2 allows the tester to easily hold the test pieces 2 to rotate the tensioning component 1. Preferably, there are three test pieces 2. The multiple test pieces 2 are evenly arranged on the main body 12 with reference to the central axis of the main body 12.

[0070] Working principle of the tooth gap measuring fixture:

[0071] like Figure 1 As shown, when it is necessary to measure the tooth clearance between gear shaft 4 and differential gear 3, the end of the tensioning component 1 with the expansion sleeve 11 is inserted into the shaft hole of differential gear 3, and the nut 14 is turned to move shaft 10 to the right. When shaft 10 moves to the right, the pushing cone surface 101 and the stop cone surface 120 move closer to each other, causing the expansion sleeve 11 to expand radially along shaft 10.

[0072] Please also refer to Figure 1 and Figure 2 When the expansion sleeve 11 is tightened into the shaft hole, place the measuring head 5 of the dial indicator against the plane on the workpiece 2 and zero the dial indicator. Then, hold the workpiece 2 and rotate the main body 12. As the main body 12 rotates, it drives the differential gear 3 to rotate, and the dial indicator reading will change. When the teeth of the differential gear 3 collide with the gear shaft 4, the dial indicator reading can be determined. The tooth clearance can be calculated from the dial indicator reading.

[0073] Please also refer to Figure 1 and Figure 2 Both gear shaft 4 and differential gear 3 are hypoid gears. The tooth clearance range between gear shaft 4 and differential gear 3 is given by the design. For example, the tooth clearance between gear shaft 4 and differential gear 3 is 0.1°, the gear ratio between gear shaft 4 and differential gear 3 is 12 / 31, the diameter of differential gear 3 is 143mm, and the ratio of the diameter of differential gear 3 to the diameter of measuring fixture is 1.208 (the diameter of measuring fixture refers to the distance between the central axis of the measuring head 5 and the central axis of the main body 12 when the measuring head 5 of the dial indicator contacts the workpiece 2, multiplied by 2).

[0074] Please also refer to Figure 1 and Figure 2 Based on the gear ratio of 12 / 31, the tooth clearance between differential gear 3 and gear shaft 4 is calculated to be 0.1° × 12 / 31 = 0.0387°. According to the arc length formula, the arc length of the tooth clearance between differential gear 3 and gear shaft 4 = 0.0387° × diameter of differential gear 3 × π / 360 = 0.049 mm. Then, based on the ratio of the diameter of differential gear 3 to the diameter of the measuring fixture (1.208), the actual arc length measured by the measuring fixture is calculated to be 0.049 / 1.208 mm = 0.041 mm. This arc length is the value measured by the dial indicator. In other words, the tooth clearance between differential gear 3 and gear shaft 4 can also be deduced from the value measured by the dial indicator.

[0075] The tooth gap measuring fixture provided in the embodiments of this application has been described in detail above. For those skilled in the art, based on the ideas of the embodiments of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be construed as a limitation of this application. All equivalent modifications or changes made in accordance with the spirit and technical concept of this application should still be covered by the claims of this application.

Claims

1. A tooling for measuring tooth clearance, characterized in that, include: Tensioning component, which is used to be fitted into the shaft hole of the differential gear and tensioned in the shaft hole; as well as The test piece is connected to the tensioning component. The test piece is used to contact the measuring head of the dial indicator and also to drive the tensioning component to rotate.

2. The tooth clearance measuring fixture according to claim 1, characterized in that, The tensioning component includes: A shaft, which includes a stop groove; An expansion sleeve is fitted onto the shaft and is used to be inserted into the shaft hole; The main body, the shaft passing through the main body, the test piece connected to the main body, and the expansion sleeve abutting against the main body; A stop member, which passes through the main body, abuts against the stop groove; and A nut is screwed to the shaft, and when the nut rotates, it causes the shaft to tighten the expansion sleeve in the shaft hole.

3. The tooth clearance measuring fixture according to claim 2, characterized in that, The shaft includes a push cone surface, the main body includes a stop cone surface, the expansion sleeve is sleeved on the push cone surface and the stop cone surface, and the push cone surface and the stop cone surface are spaced apart.

4. The tooth clearance measuring fixture according to claim 2, characterized in that, The shaft includes a first shaft segment and a second shaft segment, the first shaft segment and the second shaft segment are connected, the diameter of the first shaft segment is larger than the diameter of the second shaft segment, and the second shaft segment and the main body are spaced apart.

5. The tooth clearance measuring fixture according to claim 4, characterized in that, The stop groove is provided on the second shaft segment.

6. The tooth clearance measuring fixture according to claim 4, characterized in that, The tensioning component also includes a thrust ball bearing, which is sleeved on the second shaft section and abuts against the main body and the nut.

7. The tooth clearance measuring fixture according to claim 4, characterized in that, The main body includes a first hole segment and a second hole segment, the first hole segment and the second hole segment are connected, the diameter of the first hole segment is smaller than the diameter of the second hole segment, the first shaft segment passes through the first hole segment, and the second shaft segment passes through the second hole segment and is spaced apart from the second hole segment.

8. The tooth clearance measuring fixture according to claim 2, characterized in that, The nut includes a groove, and one end of the body is embedded in the groove.

9. The tooth clearance measuring fixture according to claim 2, characterized in that, The tensioning component also includes a thrust ball bearing, which is embedded in the main body, sleeved on the shaft, and abuts against the nut.

10. The tooth clearance measuring fixture according to any one of claims 1-9, characterized in that, The number of test pieces is multiple, and the multiple test pieces are evenly arranged on the tensioning component.

Images