Torsional strength testing device for worm gear and worm of steering gear

Abstract

The utility model provides a device for testing the torsional strength of a worm gear and a worm of a steering gear. The testing device comprises a bottom plate, a first clamp, a first clamping piece, a second clamping piece and a third clamping piece, wherein the first clamp, the first clamping piece, the second clamping piece and the third clamping piece are arranged on the bottom plate; the first clamp is provided with a first accommodating hole and a second accommodating hole, the first accommodating hole is used for accommodating a worm gear of the worm and gear to be tested, and the second accommodating hole is used for accommodating a worm of the worm and gear to be tested; when the worm gear is accommodated in the first accommodating hole and the worm is accommodated in the second accommodating hole, the worm gear teeth on the outer peripheral surface of the worm gear are meshed with the worm gear teeth on the outer peripheral surface of the worm; the first clamping piece is used for being rotationally connected with the first end of an input shaft of a worm gear, the second clamping piece is used for being connected with the second end of the input shaft of the worm gear, and rotation of the second clamping piece drives rotation of the input shaft of the worm gear. The third clamping piece is used for being connected with one end of the input shaft of the worm and preventing the worm from rotating.

Description

Technical Field

[0001] The utility model relates to the field of testing equipment, in particular to a device for testing the torsional strength of a worm gear of a steering gear. Background Art

[0002] The worm gear is an important component of the column-type electric power steering. The worm gear plays the role of deceleration and torque increase. The torque of the electric power steering motor is transmitted to the output shaft through the worm gear. Therefore, the torsional strength performance of the worm gear directly affects the power performance of the column-type electric power steering. The torsional strength test is required in the early design of the worm gear to ensure that the designed product meets the design requirements.

[0003] There is no unified worm gear torsional strength test device at present. The worm gear is small in size and not easy to install and fix. The meshing mode of the worm gear has a great influence on the torsional strength test. In order to ensure the scientificity and accuracy of the test, it is necessary to assemble it according to the actual matching mode of the worm gear.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the utility model, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0005] In response to the problems in the prior art, the purpose of the utility model is to provide a steering gear worm gear torsional strength testing device, which can be repeatedly used for various types of column-type electric power steering gear worm gear torsional strength testing, provide data support for column-type electric power steering gear worm gear design optimization, and reduce the worm gear design cost.

[0006] The embodiment of the utility model provides a worm gear torsional strength testing device for a steering gear, the testing device comprising a base plate, a first clamp and a first clamping member, a second clamping member and a third clamping member arranged on the base plate;

[0007] The first fixture is provided with a first accommodating hole and a second accommodating hole, the first accommodating hole is used to accommodate the worm wheel of the worm gear to be tested, and the second accommodating hole is used to accommodate the worm of the worm gear to be tested; when the first accommodating hole accommodates the worm wheel and the second accommodating hole accommodates the worm, the worm wheel teeth on the outer peripheral surface of the worm wheel mesh with the worm wheel teeth on the outer peripheral surface of the worm;

[0008] The first clamping member is used for rotationally connecting the first end of the input shaft of the worm gear, and the second clamping member is used for connecting the second end of the input shaft of the worm gear, and the rotation of the second clamping member drives the rotation of the input shaft of the worm gear;

[0009] The third clamp is used to connect one end of the input shaft of the worm and prevent the worm from rotating. The test device of the utility model has a simple structure, is easy to operate, has a low manufacturing cost, has a high test accuracy, and can be repeatedly used for various types of column-type electric power steering worm gear torsional strength tests, provides data support for the design optimization of the column-type electric power steering worm gear, and reduces the design cost of the worm gear.

[0010] According to some examples of the present invention, the first clamp is an integral piece; or

[0011] The first clamp is a split piece, comprising a lower part and an upper part buckled with the lower part.

[0012] According to some examples of the utility model, the first fixture is a split part, including a lower part and an upper part, the lower part is provided with a first half hole on one side facing the upper part, the upper part is provided with a second half hole on one side facing the lower part, the lower part and the upper part are connected by bolts, and after the connection, the first half hole and the second half hole form the first accommodating hole. The split first fixture is easier to process, and it is convenient to install the worm gear to be tested during testing.

[0013] According to some examples of the present invention, a central axis of the first accommodating hole is perpendicular to a central axis of the second accommodating hole.

[0014] According to some examples of the utility model, the third clamping member includes a spline sleeve at one end for connecting the input shaft of the worm, and the multiple key teeth uniformly distributed in the inner circumference of the spline sleeve match the multiple key teeth uniformly distributed in the outer circumference of the input shaft of the worm of the worm gear to be tested. The spline connection makes the connection between the third clamping member and the worm have the characteristics of good centering and guiding, and at the same time, each key tooth has uniform load, large load capacity, and less damage to the input shaft of the worm.

[0015] According to some examples of the present utility model, the third clamping member further includes a fixing plate;

[0016] The testing device further comprises a stopper disposed on the bottom plate;

[0017] The fixing plate is connected to the limiting member, and the connection between the fixing plate and the limiting member of the bottom plate prevents the worm from rotating.

[0018] According to some examples of the present invention, the second receiving hole is provided with an internal thread, and the outer periphery of the spline sleeve is provided with an external thread matching the internal thread of the second receiving hole. The above structure provides another example of preventing the worm from rotating.

[0019] According to some examples of the present utility model, the testing device further includes a torque applying unit;

[0020] The output shaft of the torque applying unit is connected to the second clamping member.

[0021] According to some examples of the present utility model, the testing device further includes a display unit and / or a storage unit;

[0022] The display unit is used to display the torque output by the torque applying unit;

[0023] The storage unit is used to store the torque output by the torque application unit during the test process.

[0024] The testing device of the utility model can be used for torsional strength testing of worm gears in the early stage of design, and by simulating the assembly form of the worm gear on the electric power steering device, the test result can truly reflect the torsional strength performance of the worm gear. The testing device has a simple structure, is easy to operate, has a low manufacturing cost, and has a high test accuracy. It can be repeatedly used for torsional strength testing of worm gears of various types of column-type electric power steering devices, providing data support for the design optimization of worm gears of column-type electric power steering devices, and reducing the design cost of the worm gear. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Other features, objectives and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings.

[0026] Figure 1 It is a structural schematic diagram of a worm gear torsional strength testing device for a steering gear according to the first embodiment of the utility model;

[0027] Figure 2 An exploded view of a worm gear torsional strength testing device for a steering gear according to the first embodiment of the utility model;

[0028] Figure 3 It is a structural schematic diagram of the first clamping member of the first embodiment of the utility model;

[0029] Figure 4 It is a structural schematic diagram of the third clamping member of the first embodiment of the utility model;

[0030] Figure 5 A cross-sectional view of a worm gear torsional strength testing device for a steering gear according to a second embodiment of the present utility model;

[0031] Figure 6 A schematic structural diagram of a worm gear torsional strength testing device for a steering gear according to a third embodiment of the present invention; and

[0032] Figure 7 It is a cross-sectional view of a worm gear torsional strength testing device for a steering gear according to the third embodiment of the present utility model. DETAILED DESCRIPTION

[0033] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that the utility model will be comprehensive and complete, and the concept of the example embodiments will be fully conveyed to those skilled in the art. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the utility model, and should not be construed as limitations on the utility model. The same reference numerals in the figures represent the same or similar structures, and thus their repeated description will be omitted.

[0034] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0035] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0036] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the utility model. In addition, the utility model can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, and does not indicate the relationship between the various embodiments and / or settings discussed in itself. In addition, the utility model provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0037] In view of the existing technical problems, the utility model provides a worm gear torsional strength testing device for a steering gear, the testing device comprising a base plate, a first clamp and a first clamping member, a second clamping member and a third clamping member arranged on the base plate; the first clamp is provided with a first accommodating hole and a second accommodating hole, the first accommodating hole is used to accommodate a worm wheel of a worm gear to be tested, and the second accommodating hole is used to accommodate a worm of a worm gear to be tested; when the first accommodating hole accommodates the worm wheel and the second accommodating hole accommodates the worm, the worm wheel teeth on the outer peripheral surface of the worm wheel are meshed with the worm wheel teeth on the outer peripheral surface of the worm; the first clamping member is used to rotatably connect the first end of the input shaft of the worm wheel, the second clamping member is used to connect the second end of the input shaft of the worm wheel and the rotation of the second clamping member drives the rotation of the input shaft of the worm wheel; the third clamping member is used to connect one end of the input shaft of the worm and prevent the rotation of the worm.

[0038] The testing device of the utility model can be used for torsional strength testing of worm gears in the early stage of design, and by simulating the assembly form of the worm gear on the electric power steering device, the test result can truly reflect the torsional strength performance of the worm gear. The testing device has a simple structure, is easy to operate, has a low manufacturing cost, has a high test accuracy, and can be reused to test the torsional strength of worm gears of various types of column-type electric power steering devices, thereby providing data support for the design optimization of the worm gear of the column-type electric power steering device and reducing the design cost of the worm gear.

[0039] The structure of the worm gear torsional strength testing device of the steering gear of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments. It can be understood that the various specific embodiments are not intended to limit the protection scope of the present invention.

[0040] Figure 1 and Figure 2 The structural schematic diagram and exploded view of the worm gear torsional strength test device of the steering gear of the first embodiment of the utility model are respectively. Specifically, the test device includes a base plate 1, a first clamp and a first clamping member, a second clamping member and a third clamping member arranged on the base plate 1; the first clamp is provided with a first accommodating hole and a second accommodating hole, the first accommodating hole is used to accommodate the worm wheel of the worm gear to be tested, and the second accommodating hole is used to accommodate the worm of the worm gear to be tested. When the first accommodating hole accommodates the worm wheel and the second accommodating hole accommodates the worm, the worm gear teeth on the outer peripheral surface of the worm wheel mesh with the worm gear teeth on the outer peripheral surface of the worm.

[0041] In some embodiments, the first fixture is an integral piece. The first receiving hole can be disposed in the middle of the first fixture, and the size of the first receiving hole matches the outer diameter of the worm wheel of the worm gear to be tested. The size of the second receiving hole matches the outer diameter of the worm of the worm gear to be tested.

[0042] In the first embodiment, the first clamp is a split part, including a lower part 21 and an upper part 22 that is buckled with the lower part 21. The lower part 21 is provided with a first half hole 211 on the side facing the upper part 22, and the upper part 22 is provided with a second half hole 221 on the side facing the lower part 21. The lower part 21 and the upper part 22 can be connected by bolts. After connection, the first half hole 211 and the second half hole 221 form the first receiving hole. The first half hole 211 and the second half hole 221 here are not half holes in the strict sense. Both can be part of the first receiving hole, and both can form the first receiving hole. The second receiving hole 222 is provided in the upper part 22, and the central axis XX' of the first receiving hole (i.e., the input shaft of the worm gear, which is perpendicular to the rotating surface of the worm gear) is perpendicular to the central axis YY' of the second receiving hole. When the first accommodating hole accommodates the worm wheel 8 and the second accommodating hole 222 accommodates the worm 9, the worm gear teeth on the outer peripheral surface of the worm wheel 8 mesh with the worm gear teeth on the outer peripheral surface of the worm 9. Figure 2 The first fixture of the split part is easier to process and is convenient for installing the worm gear to be tested during testing.

[0043] The first clamping member is used to rotatably connect the first end of the input shaft of the worm gear. Figure 3 This is a schematic structural diagram of the first clamping member of the first embodiment of the utility model, wherein the first clamping member includes a fixing rod 31 for fixing to the base plate 1 and a first sleeve 311 connected to the fixing rod 31, and the first end of the input shaft 81 of the worm wheel 8 of the worm gear to be tested can be accommodated in the first sleeve 311 through a bearing to realize the rotational connection between the output shaft of the worm wheel at this end and the first clamping member.

[0044] The second clamping member is used to connect the second end of the input shaft of the worm gear, and the rotation of the second clamping member drives the rotation of the input shaft of the worm gear. In the first embodiment, the second clamping member includes a first connecting member 32 for connecting to the torque output shaft of the torque application unit and a second connecting member 321 connected to the connecting member. The second connecting member 321 is connected to the second end of the input shaft 81 of the worm gear 8, and the rotation of the second clamping member drives the rotation of the input shaft 81 of the worm gear 8. The connection between the second end of the input shaft 81 of the worm gear 8 and the second connecting member 321 can be a spline detachable connection or a bolt detachable connection.

[0045] The third clamping member is used to connect one end of the input shaft of the worm and prevent the worm from rotating. Figure 4This is a schematic diagram of the structure of the third clamping member of the first embodiment of the utility model, wherein the third clamping member includes a spline sleeve 41 at one end for connecting the input shaft of the worm, and a plurality of key teeth 411 uniformly distributed in the inner circumference of the spline sleeve match with a plurality of key teeth uniformly distributed in the outer circumference of the input shaft of the worm 9 of the worm gear to be tested. The spline connection makes the connection between the third clamping member and the worm have the characteristics of good centering and guidance. At the same time, each key tooth is evenly loaded, has a large load-bearing capacity, and causes less damage to the input shaft of the worm. In this embodiment, a fixing plate 42 can be provided at the end of the third clamping member away from the worm, and the rotation of the third clamping member can be limited by the fixing plate.

[0046] There are many ways for the third clamping member to prevent the worm from rotating. Figure 5 This is a cross-sectional view of a worm gear torsional strength test device for a steering gear of the second embodiment of the present invention, wherein the second receiving hole 222 is provided with an internal thread, and the outer periphery of the spline sleeve 41 is provided with an external thread matching the internal thread of the second receiving hole. That is, during the test, the worm 9 is received in the second receiving hole 222, and its input shaft 91 is connected to the spline sleeve 41, and the spline sleeve 41 is threadedly connected to the second receiving hole 222. Figure 5 In the second embodiment, this end of the spline sleeve 41 is threadedly connected to the second accommodating hole 222 to prevent the spline sleeve 41 from rotating, and the spline sleeve 41 and the key teeth of the input shaft 91 of the worm 9 are engaged to prevent the worm 9 from rotating.

[0047] Figure 6 and Figure 7 The schematic diagram and cross-sectional view of the structure of the worm gear torsional strength test device of the third embodiment of the present utility model are respectively. In the third embodiment, the third clamping member also includes a third connecting member 41' and a fixed plate 42'. The end of the third connecting member 41' away from the fixed plate 42' can be the spline sleeve 41 in the first embodiment, or other structures can be adopted. Its structure can be set according to the structure of one end of the input shaft of the worm connected thereto. At this time, the test device also includes a stopper 12 arranged on the bottom plate 1; the fixed plate 42' is connected to the stopper 12, and the rotation of the worm is prevented by connecting the stopper of the fixed plate and the bottom plate.

[0048] In some embodiments, the test device further includes a torque applying unit (not shown in the figure); the output shaft of the torque applying unit is connected to the second clamping member. For the convenience of testing, the test device of the utility model can be fixed to a test platform during testing. At this time, the bottom plate 1 can be provided with a through slot 11, and a plurality of bolts can be fixedly connected to the test platform through the through slot 11. When the test device tests the worm gear to be tested, the worm wheel of the worm gear to be tested is accommodated in the first accommodating hole, and the two ends of the input shaft of the worm wheel are respectively connected to the first clamping member and the second clamping member; the worm of the worm gear to be tested is accommodated in the second accommodating hole, and the worm wheel teeth on the outer peripheral surface of the worm wheel are meshed with the worm wheel teeth on the outer peripheral surface of the worm; the end of the input shaft of the worm away from the second accommodating hole is connected to the third clamping member, and the third clamping member is fixed. At the same time, the second clamping member is connected to the output shaft of the torque applying unit, and the torque output by the output shaft of the torque applying unit is adjusted until the worm wheel and the fixed worm move relative to each other. The torque value at this time is the torsional strength of the worm gear to be tested. In this process, in order to facilitate the tester to obtain the torque applied to the worm gear to be tested at any time, the test device may further include a display unit (not shown in the figure) for displaying the torque output by the torque application unit. At the same time, in order to facilitate the analysis of test data, the test device may further include a storage unit (not shown in the figure) for storing the torque output by the torque application unit during the test.

[0049] It should be pointed out that in the technical solution of the worm gear torsional strength testing device of the steering gear of the utility model, the various functional modules and module units included therein can correspond to the specific hardware circuits in the integrated circuit structure, and therefore only involve the improvement of the specific hardware circuits. The hardware part is not merely a carrier for executing control software or computer programs. Therefore, solving the corresponding technical problems and obtaining the corresponding technical effects do not involve the application of any control software or computer programs. In other words, the utility model can solve the technical problems to be solved and obtain the corresponding technical effects by only utilizing the improvements in the hardware circuit structure involved in these modules and units, and does not require the assistance of specific control software or computer programs to achieve the corresponding functions.

[0050] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

[0051] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A worm gear torsional strength testing device for a steering gear, characterized in that: The testing device comprises a base plate, a first clamp and a first clamping member, a second clamping member and a third clamping member arranged on the base plate; The first fixture is provided with a first accommodating hole and a second accommodating hole, the first accommodating hole is used to accommodate the worm wheel of the worm gear to be tested, and the second accommodating hole is used to accommodate the worm of the worm gear to be tested; when the first accommodating hole accommodates the worm wheel and the second accommodating hole accommodates the worm, the worm wheel teeth on the outer peripheral surface of the worm wheel mesh with the worm wheel teeth on the outer peripheral surface of the worm; The first clamping member is used for rotationally connecting the first end of the input shaft of the worm gear, and the second clamping member is used for connecting the second end of the input shaft of the worm gear, and the rotation of the second clamping member drives the rotation of the input shaft of the worm gear; The third clamping member is used to connect one end of the input shaft of the worm and prevent the worm from rotating.

2. The worm gear torsional strength testing device for a steering gear according to claim 1, characterized in that: The first fixture is a one-piece piece; or The first clamp is a split piece, comprising a lower part and an upper part buckled with the lower part.

3. The worm gear torsional strength testing device for a steering gear according to claim 1, characterized in that: The first clamp is a split part, including a lower part and an upper part, the lower part is provided with a first half hole on one side facing the upper part, and the upper part is provided with a second half hole on one side facing the lower part, the lower part and the upper part are connected by bolts and after the connection, the first half hole and the second half hole form the first accommodating hole.

4. The worm gear torsional strength testing device for a steering gear according to claim 1, characterized in that: A central axis of the first accommodating hole is perpendicular to a central axis of the second accommodating hole.

5. The worm gear torsional strength testing device for a steering gear according to claim 1, characterized in that: The third clamping member includes a spline sleeve at one end for connecting to the input shaft of the worm, and a plurality of key teeth uniformly distributed in the inner circumference of the spline sleeve match with a plurality of key teeth uniformly distributed in the outer circumference of the input shaft of the worm of the worm gear to be tested.

6. The worm gear torsional strength testing device for a steering gear according to claim 5, characterized in that: The third clamping member further comprises a fixing plate; The testing device further comprises a stopper disposed on the bottom plate; The fixing plate is connected to the limiting member.

7. The worm gear torsional strength testing device for a steering gear according to claim 5, characterized in that: The second accommodating hole is provided with an internal thread, and the outer periphery of the spline sleeve is provided with an external thread matching with the internal thread of the second accommodating hole.

8. The worm gear torsional strength testing device for a steering gear according to any one of claims 1 to 7, characterized in that: The testing device also includes a torque applying unit; The output shaft of the torque applying unit is connected to the second clamping member.

9. The worm gear torsional strength testing device for a steering gear according to claim 8, characterized in that: The testing device further comprises a display unit and / or a storage unit; The display unit is used to display the torque output by the torque applying unit; The storage unit is used to store the torque output by the torque application unit during the test process.

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