Gear bending strength testing device and testing method

Abstract

The present invention relates to a gear bending strength testing device and a testing method, belonging to the technical field of gear testing devices, and solves the problems in the prior art that the bending strength of gear sets with different center distances cannot be tested, the simulation of the actual load characteristics of the gears is inaccurate, and the load application position is inaccurate. The gear bending strength testing device of the present invention includes a mounting platform, a matching gear seat, a matching gear shaft, a test gear seat and a test gear shaft; the bottom end of the matching gear seat is detachably arranged on the mounting platform, and the matching gear shaft is arranged on the matching gear seat; the bottom end of the test gear seat is fixedly arranged on the mounting platform, and the test gear shaft is arranged on the test gear seat; the matching gear shaft includes a matching gear seat keyway and a matching gear keyway arranged at an angle; the matching gear is matched and connected with the matching gear keyway; the matching gear seat keyway is matched and connected with the matching gear seat; the test gear shaft is provided with a test gear keyway, which is matched and connected with the test gear.

Description

Technical Field

[0001] The present invention belongs to the technical field of gear testing devices, and specifically relates to a gear bending strength testing device and a testing method, and more particularly to a gear bending strength testing device and a testing method capable of accurately applying a load. Background Art

[0002] Gears are the most common components in the transmission field, and their bending strength is a key factor affecting the reliability of devices and products. In the current existing technology, many gear bending strength test devices have been developed, most of which are designed for gears with specific parameters and are difficult to apply to gears with different center distances; gears are usually loaded by means of a conical hammer, which is difficult to truly simulate the actual contact conditions of the gears, resulting in a large deviation between the test results and actual applications; according to the gear bending strength calculation method specified by international and domestic standards, the load application position is located at the highest point of the single tooth meshing area. The current experimental device is difficult to accurately control the load application position, which reduces the accuracy of the bending strength test results. Therefore, the existing technology has a high test cost and is difficult to simulate the load characteristics of real gears and compare simulation results. It is necessary to develop a new gear bending strength test device. Summary of the invention

[0003] In view of the above problems, the present invention provides a gear bending strength testing device and testing method, which solves the problems in the prior art of being unable to test the bending strength of gear sets with different center distances, inaccurate simulation of the actual load characteristics of gears, and inaccurate load application position.

[0004] The present invention provides a gear bending strength testing device with a variable center distance, comprising a mounting platform, a matching gear seat, a matching gear shaft, a test gear seat and a test gear shaft;

[0005] The bottom end of the matching gear seat is detachably arranged on the mounting platform, and the matching gear shaft is arranged on the matching gear seat;

[0006] The bottom end of the test gear seat is fixedly arranged on the mounting platform, and the test gear shaft is arranged on the test gear seat;

[0007] The mating gear shaft includes a mating gear seat keyway and a mating gear keyway which are arranged at an angle; the mating gear is matingly connected with the mating gear keyway; the mating gear seat keyway is matingly connected with the mating gear seat;

[0008] The test gear shaft is provided with a test gear keyway for mating and connecting with the test gear.

[0009] Optionally, the mating gear shaft is arranged at the top end of the mating gear seat.

[0010] Optionally, the mating gear shaft is arranged at a central position of the top end of the mating gear seat.

[0011] Optionally, the test gear shaft is arranged at the top end of the test gear seat.

[0012] Optionally, the test gear shaft is arranged at a central position of the top end of the test gear seat.

[0013] Optionally, the mounting platform includes a mounting rail and a position scale.

[0014] Optionally, the mating gear seat includes a mating gear cover and a mating gear shaft mounting groove.

[0015] Optionally, the test gear seat includes a test gear cover and a test gear shaft mounting groove.

[0016] Optionally, the mating gear seat includes a mating locating mark.

[0017] Another aspect of the present invention further discloses a gear bending strength testing method, using the aforementioned gear bending strength testing device, and the specific steps are as follows:

[0018] Step 1: Adjust the position of the mating gear seat on the mounting platform according to the calculated center distance of the gear pair; measure the center distance of the gear pair;

[0019] Step 2: Connect the mating gear shaft provided with the mating gear seat keyway and the mating gear keyway which are arranged at an angle to the mating gear and the mating gear seat respectively;

[0020] Step 3: Apply torque to the test gear shaft so that the mating gear and the test gear obtain a load along the normal direction of the contact surface at the meshing point;

[0021] Step 4: Collect the strain and stress at the root of the test gear, and obtain the bending strength of the gear based on the strain and stress.

[0022] Compared with the prior art, the present invention has at least the following beneficial effects:

[0023] (1) The gear bending strength testing device of the present invention can change the center distance by means of positioning marks and fastening bolts, and can accurately control the center distance between the test gear and the mating gear. By introducing the mating gear, the actual load characteristics of the test gear can be simulated.

[0024] (2) The gear bending strength testing device of the present invention can accurately control the load loading position of the test gear by controlling the relative angle θ of the keyway on the mating gear shaft, effectively improving the calculation of the tooth root strength and further increasing the testing accuracy of the gear bending strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings are only for the purpose of illustrating particular embodiments and are not to be construed as limiting the invention.

[0026] Figure 1 is a front view of the gear bending strength testing device of the present invention;

[0027] Figure 2 It is a schematic diagram of the installation of the test gear and the matching gear of the present invention;

[0028] Figure 3 It is a structural schematic diagram of the matching gear shaft of the present invention;

[0029] Figure 4 It is a schematic structural diagram of the test gear shaft of the present invention.

[0030] Reference numerals:

[0031] 1. Mounting platform, 1-1. Mounting guide rail, 1-2. Position scale, 2. Matching gear seat, 2-1. Matching positioning mark, 2-2. Fastening bolts, 3. Matching gear cover, 3-1. Matching gear cover bolts, 4. Matching gear shaft, 5. Test gear seat, 5-1. Test positioning mark, 6. Test gear cover, 6-1. Test gear cover bolts, 7. Test gear shaft, 8. Matching gear, 8-1. Matching gear keyway, 8-2. Matching gear seat keyway, 9. Test gear, 10. Test gear keyway, L. Gear center distance. DETAILED DESCRIPTION

[0032] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. In addition, the present invention can also be implemented in other ways different from those described herein, and therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0033] A specific embodiment of the present invention, as Figure 1-Figure 4 , discloses a gear bending strength testing device with a variable center distance, comprising a mounting platform 1, a matching gear seat 2, a matching gear cover 3, a matching gear shaft 4, a test gear seat 5, a test gear cover 6 and a test gear shaft 7;

[0034] The bottom end of the matching gear seat 2 is slidably arranged on the mounting platform 1, and the top end is provided with a matching gear cover 3 and a matching gear shaft 4; the top end of the matching gear seat 2 is provided with a matching gear shaft mounting groove;

[0035] Preferably, the mating gear shaft 4 is arranged at the center position of the top end of the mating gear seat 2 .

[0036] The bottom end of the test gear seat 5 is fixedly arranged on the mounting platform 1, and the top end of the test gear seat 5 is provided with a test gear cover 6 and a test gear shaft 7; the top end of the test gear seat 5 is provided with a test gear shaft mounting groove;

[0037] Preferably, the test gear shaft 7 is arranged at the center position of the top end of the test gear seat 5 .

[0038] Furthermore, the mounting platform 1 includes a mounting rail 1 - 1 and a position scale 1 - 2 , and the position scale 1 - 2 is marked with scales.

[0039] Furthermore, the matching gear seat 2 includes a matching positioning mark 2-1; the matching positioning mark 2-1 is aligned with the center line position of the matching gear shaft 4, and is used to measure the center distance of the gear pair according to the scale on the position scale 1-2; when in use, the matching gear seat 2 is adjusted on the mounting platform 1 according to the calculated center distance of the gear pair, and the matching gear seat 2 is fixed to the mounting platform 1 using the fastening bolts 2-2 to achieve adjustable center distance variation, and then the center distance of the gear pair is measured.

[0040] Furthermore, the calculated center distance of the gear pair is a ,expression:

[0041]

[0042] in, m n is the gear module; z p and z s are the number of teeth of the test gear and the mating gear respectively; x p and x s are the gear modification coefficients of the test gear and the mating gear respectively.

[0043] Furthermore, the matching gear cover 3 is installed on the top of the matching gear seat 2 through the matching gear cover bolt 3-1, and is connected to the threaded hole on the matching gear seat 2; a matching gear mounting section is provided on the matching gear cover 3, and the matching gear mounting section and the matching gear shaft mounting groove form a gear placement space for placing the matching gear shaft 4.

[0044] Further, see Figure 3 The mating gear shaft 4 is provided with a mating gear seat keyway 8-2 and a mating gear keyway 8-1; the mating gear keyway 8-1 is mated with the mating gear 8, and the mating gear keyway 8-1 corresponds to the center line of the teeth of the mating gear 8, such as Figure 2 As shown; the mating gear seat keyway 8-2 is fixed to the mating gear seat 2; the angle formed between the mating gear keyway 8-1 and the mating gear seat keyway 8-2 along the axial direction of the mating gear shaft 4 is θ, and the expression is:

[0045] in, s ps is the pitch circle tooth thickness of the mating gear; r ps is the pitch circle radius of the mating gear; r as is the radius of the tooth tip circle of the mating gear; z p and z s are the test gear and the number of teeth of the paired gear respectively; r b and r p are the base circle radius of the test gear and the tooth profile radius at the gear meshing position, respectively; α n is the test gear pitch circle pressure angle; p t is the gear pair pitch.

[0046] The present invention can accurately control the position where the load is applied by setting the angle of the two keyways to θ.

[0047] Furthermore, the test gear seat 5 includes a test positioning mark 5-1, the position of the test positioning mark 5-1 is located at the end point (such as the starting point or the end point) of the position scale 1-2, the matching positioning mark 2-1 is aligned with the center line position of the matching gear shaft 4, and the test positioning mark 5-1 is aligned with the center line position of the test gear shaft; when in use, the matching gear seat 2 is fixed to the mounting platform 1 by tightening the bolts 2-2 to achieve adjustable center distance variation.

[0048] Furthermore, the test gear cover 6 is installed on the top of the test gear seat 5 through the test gear cover bolt 6-1, and is connected to the threaded hole on the test gear seat 5; a test gear mounting section is provided on the test gear cover 6, and the test gear mounting section and the test gear shaft mounting groove form a gear placement space for placing the test gear shaft 7.

[0049] Furthermore, the test gear shaft 7 is provided with a test gear keyway 10 for fixing with the test gear 9; the test gear shaft 7 is connected to the torque loading device through a flange for applying a load; the keyway corresponds to the center line of the teeth of the test gear 9, such as Figure 2 As shown;

[0050] Another embodiment of the present invention discloses a method for testing the bending strength of a gear, and the specific steps are as follows:

[0051] Step 1: Adjust the position of the mating gear seat 2 on the mounting platform 1 according to the calculated center distance of the gear pair; measure the center distance of the gear pair.

[0052] Step 2: The mating gear shaft 4 with the angle between the mating gear keyway 8-1 and the mating gear seat keyway 8-2 set to θ is connected to the mating gear and the mating gear seat respectively.

[0053] Step 3: Apply torque to the test gear shaft 7 so that the mating gear 8 and the test gear 9 obtain a load along the normal direction of the contact surface at the meshing point. F n .

[0054] The expression for the applied torque is:

[0055]

[0056] in, Indicates the applied torque; F n represents the applied load; m n is the gear module; z p is the number of teeth of the test gear; Represents the gear pressure angle.

[0057] Step 4: Collect the strain and stress at the root of the test gear 9, and obtain the bending strength of the gear based on the strain and stress.

[0058] Furthermore, the tooth root cracks were observed and the bending fatigue strength of the gear was obtained.

[0059] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A gear bending strength testing device with variable center distance, characterized in that: It includes a mounting platform, a matching gear seat, a matching gear shaft, a test gear seat and a test gear shaft; The bottom end of the matching gear seat is detachably arranged on the mounting platform, and the matching gear shaft is arranged on the matching gear seat; The bottom end of the test gear seat is fixedly arranged on the mounting platform, and the test gear shaft is arranged on the test gear seat; The mating gear shaft includes a mating gear seat keyway and a mating gear keyway which are arranged at an angle; the mating gear is matingly connected with the mating gear keyway; the mating gear seat keyway is matingly connected with the mating gear seat; The gear pair is the test gear and the mating gear. The calculated center distance of the gear pair is a ,expression: in, m n is the gear module; z p and z s are the number of teeth of the test gear and the mating gear respectively; x p and x s are the gear modification coefficients of the test gear and the mating gear respectively; The keyway of the mating gear corresponds to the center line of the teeth of the mating gear; the angle formed between the keyway of the mating gear and the keyway of the mating gear seat along the opposite direction of the axial direction of the mating gear shaft is θ, and the expression is: in, s ps is the pitch circle tooth thickness of the mating gear; r ps is the pitch circle radius of the mating gear; r as is the radius of the tooth tip circle of the mating gear; z p and z s are the test gear and the paired gear number, respectively; r b and r p are the base circle radius of the test gear and the tooth profile radius at the gear meshing position, respectively; α n is the test gear pitch circle pressure angle; p t is the gear pair pitch; The test gear shaft is provided with a test gear keyway for mating and connecting with the test gear.

2. The gear bending strength testing device according to claim 1, characterized in that: The matching gear shaft is arranged on the top end of the matching gear seat.

3. The gear bending strength testing device according to claim 1, characterized in that: The mating gear shaft is arranged at the center position of the top end of the mating gear seat.

4. The gear bending strength testing device according to claim 1, characterized in that: The test gear shaft is arranged at the top end of the test gear seat.

5. The gear bending strength testing device according to claim 1, characterized in that: The test gear shaft is arranged at the center position of the top end of the test gear seat.

6. The gear bending strength testing device according to claim 1, characterized in that: The mounting platform includes mounting rails and position scales.

7. The gear bending strength testing device according to claim 1, characterized in that: The mating gear seat comprises a mating gear cover and a mating gear shaft mounting groove.

8. The gear bending strength testing device according to claim 1, characterized in that: The test gear seat includes a test gear cover and a test gear shaft mounting groove.

9. The gear bending strength testing device according to claim 1, characterized in that: The mating gear seat includes a mating positioning mark.

10. A method for testing the bending strength of a gear, using the gear bending strength testing device according to any one of claims 1 to 9, characterized in that: The specific steps are as follows: Step 1: Adjust the position of the mating gear seat on the mounting platform according to the calculated center distance of the gear pair; measure the center distance of the gear pair; Step 2: Connect the mating gear shaft provided with the mating gear seat keyway and the mating gear keyway which are arranged at an angle to the mating gear and the mating gear seat respectively; Step 3: Apply torque to the test gear shaft so that the mating gear and the test gear obtain a load along the normal direction of the contact surface at the meshing point; Step 4: Collect the strain and stress at the root of the test gear, and obtain the bending strength of the gear based on the strain and stress.

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