Motor worm looseness measuring device and measuring method thereof

Abstract

The invention provides a device for measuring the looseness of a motor worm. The device comprises a motor, a motor fixing mechanism and a deflector rod moving mechanism. The motor comprises a motor part, a worm and a shell, the worm is driven by the motor part to rotate, a worm containing part used for containing the worm is arranged in the shell, the first end of the worm containing part is connected with the motor part, and the second end of the worm containing part is sealed; the motor fixing mechanism is used for fixing the motor, so that the worm extends along the Y direction; the shifting rod moving mechanism comprises a shifting rod, a displacement sensor connected with the shifting rod and a moving assembly used for driving the shifting rod to move in the X direction, the Y direction and the Z direction, the shifting rod comprises an inserting piece, and the inserting piece can be inserted into spiral teeth of the worm; the displacement sensor is used for detecting the displacement of the deflector rod in the Y direction. The invention further provides a measuring method of the motor worm looseness measuring device. The worm looseness detection device has the beneficial effects that the motor fixing mechanism and the driving lever moving mechanism are arranged, so that the looseness of the worm is detected.

Description

Technical Field

[0001] The present invention relates to the field of motor technology, and in particular to a motor worm looseness measuring device and a measuring method thereof. Background Art

[0002] The motor with a reducer currently installed in the vehicle connects the worm gear reducer and the motor unit together. The worm gear reducer includes a worm rotating under the drive of the motor unit, a worm wheel meshing with the worm, and an output gear connected to the worm wheel transmission. The output gear outputs the rotational force to the outside, thereby controlling the operation of the mechanism in the vehicle.

[0003] To avoid affecting the normal rotation of the worm, a gap (i.e., the looseness of the worm) must be left between the free end of the worm and the motor housing. However, the specific value of the looseness of the worm cannot be accurately obtained during the assembly process of the motor, which affects the final yield of the motor. Summary of the invention

[0004] In view of the above-mentioned defects, an object of the present invention is to provide a device for measuring the looseness of a motor worm to help obtain an accurate value of the looseness of the worm.

[0005] The present invention provides a device for measuring the looseness of a motor worm, comprising: a motor, comprising a motor part, a worm rotating under the drive of the motor part, and a shell, wherein the shell is provided with a worm accommodating part for accommodating the worm, the first end of the worm accommodating part is connected to the motor part, and the second end thereof is sealed; a motor fixing mechanism, used for fixing the motor so that the worm extends along the Y direction; a lever moving mechanism, comprising a lever, a displacement sensor connected to the lever, and a moving assembly for driving the lever to move along the X direction, the Y direction and the Z direction, the lever comprising an insert for inserting into the spiral teeth of the worm; and the displacement sensor is used for detecting the displacement of the lever along the Y direction.

[0006] Preferably, the motor fixing mechanism includes: a back plate, a first positioning portion and a contour portion are provided on the surface of the back plate facing the lever moving mechanism, the first positioning portion is used to be inserted and matched with a first positioning hole provided on the shell, and the contour portion includes a contour surface matching with the outer contour of the shell; a pressure plate, which is arranged opposite to the back plate, a second positioning portion is provided on the surface of the back plate facing the back plate, the second positioning portion is used to be inserted and matched with a second positioning hole provided on the shell, and the pressure plate is also provided with an opening for the lever to pass through; a pressure plate linear displacement drive source is used to drive the pressure plate to approach or move away from the back plate.

[0007] Preferably, a tension spring is connected between the back plate and the pressure plate.

[0008] Preferably, the number of the contoured portions is two, and the two contoured portions are distributed on the back plate along the Z direction.

[0009] Preferably, the moving assembly includes: a mounting seat, on which the lever and the displacement sensor are respectively arranged; a first mounting portion, on which a first guide rail and a first linear displacement driving source are respectively provided, the first guide rail extends along the Y direction, and the first linear displacement driving source is used to drive the mounting seat to move along the first guide rail; a second mounting portion, on which a second guide rail and a second linear displacement driving source are respectively provided, the second guide rail extends along the Z direction, and the second linear displacement driving source is used to drive the first mounting portion to move along the second guide rail; a third linear displacement driving source is arranged on the second mounting portion, and is used to drive the second mounting portion to move along the third guide rail, and the third guide rail is fixedly arranged and extends along the X direction.

[0010] Preferably, a nitrogen spring is further provided at one end of the third guide rail close to the motor fixing mechanism.

[0011] Preferably, the insert comprises a first end and a second end distributed along the Z direction, and the first end and the second end can be inserted into the helical teeth of the worm.

[0012] Preferably, the insert is rhombus-shaped.

[0013] Preferably, the second end of the worm accommodating portion is open, and a first bushing is provided therein, one end of the first bushing is connected to a seal for sealing the second end, and the other end is connected to a second bushing, and the free end of the worm passes through the second bushing and extends toward the direction of the seal.

[0014] The present invention also provides a method for measuring the looseness of the motor worm, comprising the following steps:

[0015] The motor to be tested is fixed by the motor fixing mechanism;

[0016] The moving assembly drives the lever to move so that the insert is inserted into the spiral teeth of the worm;

[0017] The moving assembly drives the shifting rod to drive the screw to move toward the first end of the worm accommodating portion, and the displacement sensor returns to zero;

[0018] The moving assembly drives the shifting rod to drive the screw to move toward the second end of the worm accommodating portion, and the displacement value obtained by the displacement sensor is the looseness of the worm of the motor.

[0019] The benefit of the present invention lies in that, by setting up a motor fixing mechanism and a lever moving mechanism, the looseness of the worm can be detected. The device can automatically complete the measurement operation without manual operation, while greatly improving the motor yield and reducing rework costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A three-dimensional diagram of a motor worm looseness measuring device according to the present invention;

[0021] Figure 2 is a top view of the motor of the present invention;

[0022] Figure 3 is an exploded view of the motor of the present invention;

[0023] Figure 4 for Figure 2 Sectional view in the AA direction;

[0024] Figure 5 (a) is a schematic diagram of the relative position of the free end of the worm and the seal when the looseness of the worm is greater than 0.3 mm;

[0025] Figure 5 (b) is a schematic diagram of the relative position of the free end of the worm and the seal when the looseness of the worm is 0;

[0026] Figure 6 and Figure 7 are three-dimensional images of the motor fixing mechanism at different viewing angles;

[0027] Figure 8 is a schematic diagram of the assembly of the first motor and the motor fixing mechanism;

[0028] Fig. 9 is a schematic diagram of the assembly of the second motor and the motor fixing mechanism;

[0029] Fig.10 and Fig.11 The three-dimensional diagram of the lever moving mechanism at different viewing angles;

[0030] Fig.12 is a schematic diagram of the structure of the lever;

[0031] Fig.13 (a)-(e) are schematic diagrams of the movement direction of the lever when measuring the looseness of the worm.

[0032] Component number description:

[0033] 1 Motor

[0034] 11 Housing

[0035] 111 Worm housing

[0036] 1111 Opening

[0037] 1112 Second positioning hole

[0038] 112 Gear housing

[0039] 12 Cover

[0040] 13 Motor

[0041] 141 Worm gear

[0042] 142 Output gear

[0043] 15 Worm

[0044] 151 First helical tooth

[0045] 152 Second spiral tooth

[0046] 16 Seals

[0047] 17 First Bushing

[0048] 18 Second bushing

[0049] 2 Motor fixing mechanism

[0050] 21 Back Panel

[0051] 211 First positioning unit

[0052] 212 Copying Department

[0053] 213 First connecting piece

[0054] 2121 First Profiling Department

[0055] 2122 Second Profiling Department

[0056] 2123 profiling surface

[0057] 22 Connect the bracket

[0058] 221 Second connecting piece

[0059] 23 Platen

[0060] 231 Opening

[0061] 232 Second positioning unit

[0062] 24 Extension spring

[0063] 25 Platen linear displacement drive source

[0064] 3. Lever movement mechanism

[0065] 31 First linear displacement drive source

[0066] 32 Second linear displacement drive source

[0067] 33 Third linear displacement drive source

[0068] 34 Lever

[0069] 341 Rod

[0070] 342 Inserts

[0071] 3421 First End

[0072] 3422 First end

[0073] 35 Mounting Seat

[0074] 36 Displacement Sensor

[0075] 371 First Installation Department

[0076] 372 Second installation part

[0077] 373 Third Installation Section

[0078] 381 First Rail

[0079] 382 Second rail

[0080] 383 Third rail

[0081] 39 Nitrogen spring DETAILED DESCRIPTION

[0082] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, but not to limit the present invention.

[0083] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0084] In the description of the present invention, 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0085] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0086] Figure 1 The figure is a three-dimensional diagram of the motor worm looseness measuring device of the present invention. In the following description, Figure 1 The drawings in the figure are used as the reference basis for the direction, and the first guide rail 381 is defined to extend in the left-right direction, and the third linear displacement driving source 33 is set on the left side of the second linear displacement driving source 32; the second guide rail 382 is defined to extend in the up-down direction, and the mounting seat 35 is set above the second linear displacement driving source 32; the third guide rail 383 is defined to extend in the front-to-back direction, and the motor fixing mechanism 2 is located in front of the lever displacement mechanism 3; the left-to-right direction, the up-to-down direction and the front-to-back direction are perpendicular to each other. At the same time, the front-to-back direction is defined as the X direction, the left-to-right direction is defined as the Y direction, and the up-to-down direction is defined as the Z direction, that is, the X direction, the Y direction and the Z direction are perpendicular to each other.

[0087] like Figure 1 As shown, the present invention provides a device for measuring the looseness of a motor worm, which includes a motor 1, a motor fixing mechanism 2 and a lever moving mechanism 3.

[0088] like Figure 2-4As shown, the motor 1 includes a motor part 13, a worm 15 rotating under the drive of the motor part 13, a worm wheel 141 meshing with the worm 15, an output gear 142 connected to the worm wheel 141, and a housing 11. The motor part 13 can be a DC motor with a brush, etc., and its rotating shaft and the worm 15 are an integrated structure. The housing 11 is provided with a worm accommodating part 111 for accommodating the worm 15 and a gear accommodating part 112 for accommodating the worm wheel 141 and the output gear 142. The worm accommodating part 111 and the gear accommodating part 112 are connected through an opening 1111 provided on the side wall of the worm accommodating part 111. Among them, a cover plate 12 is provided at the open part of the gear accommodating part 112, and the cover plate 12 is used to seal the gear accommodating part 112. The output gear 142 outputs the rotational force to the outside, thereby controlling the operation of the mechanism in the vehicle. Both ends of the worm accommodating portion 111 are provided with openings, the first end opening is tightly connected to the motor portion 13, the inner wall of the second end opening is interference fit with the first bushing 17, the first end of the first bushing 17 is threadedly connected to the seal 16, and the seal 16 seals the second end opening; the second end of the first bushing 17 is interference fit with the second bushing 18, the free end of the worm 15 passes through the second bushing 18 and extends in the direction of the seal 16, and it can rotate around its own axis or move along its own axis in the second bushing 18.

[0089] According to the design requirements, the distance between the free end of the worm 15 and the seal 16 (hereinafter referred to as "worm looseness") should be greater than 0 and less than or equal to 0.3 mm. Figure 5 As shown in (a), if the worm gear looseness is greater than 0.3 mm, the motor 1 will make an abnormal sound when the motor unit 13 drives the worm gear 15 to rotate; Figure 5 As shown in (b), if the looseness of the worm is 0, the rotational resistance of the worm 15 is relatively large, which will affect the normal operation of the motor 1.

[0090] like Figure 1 , Figure 6 and Figure 7As shown, the motor fixing mechanism 2 is used to fix the motor 1 so that the worm 15 extends along the Y direction. Specifically, the motor fixing mechanism 2 includes a back plate 21, a pressure plate 23 and a pressure plate linear displacement driving source 25. A plurality of first positioning portions 211 and a profiling portion 212 are provided on the surface of the back plate 21 facing the lever moving mechanism 3. The first positioning portions 211 are inserted and matched with a plurality of first positioning holes provided on the front side of the housing 11 in a one-to-one correspondence to achieve the limitation of the motor 1 in the Y direction and the Z direction. The profiling portion 212 includes a profiling surface 2123 matched with the outer contour of the housing 11, which can also limit the motor 1 in the Y direction and the Z direction. The pressure plate 23 is arranged opposite to the back plate 21 along the X direction and is located between the back plate 21 and the lever moving mechanism 3. A second positioning portion 232 is provided on the surface facing the back plate 21. The second positioning portion 232 is used to be inserted and matched with the second positioning hole provided on the rear side of the housing 11. The pressure plate linear displacement driving source 25 is used to drive the pressure plate 23 to move along the X direction, so that the pressure plate 23 is close to or away from the back plate 21. Under the driving action of the pressure plate linear displacement driving source 25, the pressure plate 23 is close to the back plate 21, and the second positioning portion 232 is inserted into the second positioning hole to limit the motor 1 in the X direction. In this way, the motor fixing mechanism 2 completes the three-way limiting of the motor 1, and the position of the motor 1 is fixed without displacement or loosening. The shapes of the first positioning portion 211 and the second positioning portion 232 are not limited, and both can be any one of a cylinder, a cuboid, and a polygon.

[0091] In a specific embodiment of the present invention, a connecting bracket 22 is further provided on the back plate 21, and a pressing plate linear displacement driving source 25 is provided on the connecting bracket 22. Those skilled in the art may also provide the pressing plate linear displacement driving source 25 on the outside of the back plate 21 as required. Figure 6 and Figure 8As shown, the number of the second positioning parts 232 is specifically two, and the two second positioning parts 232 are distributed on the pressing plate 23 along the Y direction; two second positioning holes 1112 distributed along the Y direction are provided on the rear side of the worm accommodating part 111, and the opening 1111 is located between the two second positioning holes 1112. The two second positioning parts 232 are inserted and matched with the two second positioning holes 1112 in a one-to-one correspondence. When the pressing plate linear displacement driving source 25 drives the two second positioning parts 232 to be inserted into the two second positioning holes 1112 at the same time, the three-way limit of the worm accommodating part 111 can be further realized to avoid the deviation or looseness of the worm accommodating part 111 affecting the accuracy of the subsequent measurement results. Furthermore, a first connecting member 213 is also provided on the back plate 21, and a second connecting member 221 is also provided on the pressing plate 23, and a tension spring 24 is connected between the first connecting member 213 and the second connecting member 221. When the pressing plate linear displacement driving source 25 drives the pressing plate 23 to approach the back plate 21 , the tension spring 24 is compressed, and applies a pressing force in the X direction to the housing 11 through the second positioning portion 232 , pressing the housing 11 against the back plate 21 .

[0092] Those skilled in the art may also select other structural forms of the motor fixing mechanism 2 as needed, as long as the three-way limiting function of the motor 1 is achieved.

[0093] Furthermore, combined with Figure 3 , Figure 8 and Fig. 9 It can be known that the helical teeth arranged on the worm 15 are the first helical teeth 151 or the second helical teeth 152, the first helical teeth 151 are left-handed or right-handed helical teeth, and the rotation direction of the second helical teeth 152 is opposite to that of the first helical teeth 151. In the present invention, the motor having the first helical teeth 151 is referred to as the first motor, and the motor having the second helical teeth 152 is referred to as the second motor. Since the rotation directions of the first helical teeth 151 and the second helical teeth 152 are different, in order to better output power, the gear housing 112 of the first motor and the gear housing 112 of the second motor are respectively arranged on different sides of the worm housing 111. Figure 8 As shown, the gear housing portion 112 of the first motor is disposed below the worm housing portion 111, and the lower half of the first helical tooth 151 is exposed from the opening 1111; Fig. 9As shown, the gear housing portion 112 of the second motor is arranged above the worm housing portion 111, and the upper half of the second helical tooth 152 is exposed from the opening 1111. In order to adapt to the first motor and the second motor at the same time and meet the requirements of measuring the looseness of the worm of the two motors, in the motor fixing mechanism 2 of the present invention, the number of the profiling portion 212 is two, including a first profiling portion 2121 arranged on the top of the back plate 21 and a second profiling portion 2122 arranged on the bottom of the back plate 21, and the first profiling portion 2121 and the second profiling portion 2122 are distributed along the Z direction. The housing of the first motor contacts and cooperates with the profiling surface of the second profiling portion 2122, and the housing of the second motor contacts and cooperates with the profiling surface of the first profiling portion 2121.

[0094] Specifically, the housing of the first motor and the housing of the second motor are symmetrical about the Y direction, and the first profiling portion 2121 and the second profiling portion 2122 are symmetrical about the Y direction.

[0095] like Figure 3 and Figure 10-12 As shown, the lever moving mechanism 3 includes a lever 34, a displacement sensor 36 connected to the lever 34, and a moving assembly for driving the lever 34 to move along the X direction, the Y direction, and the Z direction. The lever 34 includes a rod body 341 extending along the X direction and an insert 342 disposed at the front end of the rod body 341, and the insert 342 can be inserted into the helical teeth of the worm 15. The displacement sensor 36 is used to detect the displacement of the lever 34 along the Y direction.

[0096] like Fig.12 As shown, in order to make the insert 342 compatible with the first motor and the second motor at the same time and meet the requirements of the two motors for measuring the looseness of the worm, the insert 342 includes a first end 3421 and a second end 3422 distributed along the Z direction, and the first end 3421 is located above the second end 3422, and both can be inserted into the spiral teeth of the worm 15.

[0097] As described above, since the lower half of the first helical tooth 151 is exposed from the opening 1111, the insert 342 can approach the first helical tooth 151 from bottom to top, so that the first end 3421 is inserted into the tooth gap of the first helical tooth 151. Since the upper half of the second helical tooth 152 is exposed from the opening 1111, the insert 342 can approach the second helical tooth 152 from top to bottom, so that the second end 3422 is inserted into the tooth gap of the second helical tooth 152. The first end 3421 and the second end 3422 are preferably tapered, and their widths gradually decrease from the side away from the helical tooth to the side close to the helical tooth. This arrangement facilitates the first end 3421 / the second end 3422 to enter or leave the tooth gap of the helical tooth and avoid interference with the helical teeth. Preferably, the insert 342 is rhombus-shaped.

[0098] like Figure 1, Figure 3 , Figure 6 and Fig.10 As shown, an opening 231 for the lever 34 to pass through is further provided on the pressing plate 23 of the motor fixing mechanism 2, and the setting position of the opening 231 corresponds to the setting position of the opening 1111, and two second positioning portions 232 are distributed on the left and right sides of the opening 231. The moving assembly can drive the lever 34 to pass through the opening 231 and approach the spiral teeth exposed from the opening 1111, and finally the first end 3421 or the second end 3422 is inserted into the spiral teeth.

[0099] like Fig.10 and Fig.11 As shown, the moving assembly includes a mounting seat 35, a first mounting portion 371, a first guide rail 381, a first linear displacement driving source 31, a second mounting portion 372, a second guide rail 382, ​​a second linear displacement driving source 32, a third guide rail 383 and a third linear displacement driving source 33. The lever 34 and the displacement sensor 36 are respectively arranged on the mounting seat 35. The first mounting portion 371 is respectively provided with a first guide rail 381 and a first linear displacement driving source 31, the first guide rail 381 extends along the Y direction, the mounting seat 35 is slidably arranged on the first guide rail 381, and the first linear displacement driving source 31 is used to drive the mounting seat 35 to move along the first guide rail 381. The displacement value of the mounting seat 35 along the first guide rail 381 is the displacement value of the lever 34 along the Y direction. The second mounting portion 372 is provided with a second guide rail 382 and a second linear displacement driving source 32, respectively. The second guide rail 382 extends along the Z direction. The first mounting portion 371 is slidably arranged on the second guide rail 382. The second linear displacement driving source 32 is used to drive the first mounting portion 371 to move along the second guide rail 382. The third linear displacement driving source 33 is fixed to the second mounting portion 372 through the third mounting portion 373. The second mounting portion 372 is slidably arranged on the third guide rail 383. The third linear displacement driving source 33 is used to drive the second mounting portion 372 to move along the third guide rail 383. The third guide rail 383 is fixedly arranged and extends along the X direction. Preferably, a nitrogen spring 39 is further provided at one end of the third guide rail 383 close to the motor fixing mechanism 2, and the nitrogen spring 39 can buffer the displacement of the second mounting portion 372 in the X direction.

[0100] The structural forms of the aforementioned pressure plate linear displacement driving source 25, the first linear displacement driving source 31, the second linear displacement driving source 32 and the third linear displacement driving source 33 are not limited, and can be devices such as cylinders, electric cylinders, hydraulic cylinders, etc. that can output linear displacement driving force.

[0101] The working process of the aforementioned moving assembly driving the lever 34 to complete the three-way movement is as follows:

[0102] When the lever 34 needs to be driven to move in the Y direction, the first linear displacement driving source 31 works to drive the mounting seat 35 to move in the Y direction along the first guide rail 381 to adjust the Y direction position of the lever 34;

[0103] When the lever 34 needs to be driven to move in the Z direction, the second linear displacement driving source 32 works to drive the first mounting portion 381, the first linear displacement driving source 31, the mounting seat 35 and the first guide rail 381 to move in the Z direction along the second guide rail 382 at the same time, so as to adjust the Z direction position of the lever 34;

[0104] When it is necessary to drive the lever 34 to move along the X direction, the third linear displacement driving source 33 works to drive the second mounting portion 382, ​​the second linear displacement driving source 32, the second guide rail 382, ​​the first mounting portion 381, the first linear displacement driving source 31, the mounting seat 35 and the first guide rail 381 to move along the X direction at the same time to adjust the X-direction position of the lever 34.

[0105] like Figure 1 , Figure 10-13 As shown, the present invention also provides a method for measuring the looseness of the motor worm, the method comprising the following steps:

[0106] S1, fixing the motor 1 to be tested by the motor fixing mechanism 2;

[0107] S2, such as Fig.13 As shown in (a), the third linear displacement driving source 33 works first, driving the lever 34 to move from the initial position along the X direction and approach the motor 1 to be tested, until the lever 34 reaches the first position; then, as shown in Fig.13 As shown in (b), the second linear displacement driving source 32 works, driving the lever 34 to move along the Z direction, so that the insert 342 is inserted into the helical tooth, and the position of the lever 34 at this time is recorded as the second position;

[0108] S3, such as Fig.13 As shown in (c), the first linear displacement driving source drives the lever 34 to move toward the first end of the worm accommodating portion 111, and applies a pressure of 40N to the worm 15 through the lever 34, driving the worm 15 to move toward the first end of the worm accommodating portion 111 at the same time, thereby eliminating the initial connection gap between the worm 15 and the motor portion 13, and the displacement sensor 36 returns to zero;

[0109] S4, such as Fig.13 As shown in (d), the first linear displacement driving source drives the lever 34 to move toward the second end of the worm accommodating portion 111, and applies a pressure of 40N to the worm 15 through the lever 34, driving the worm 15 to move toward the second end of the worm accommodating portion 111 at the same time, until the free end of the worm 15 abuts against the sealing member 16; the displacement value obtained by the displacement sensor 36 after removing the interference value by calculation is the worm looseness of the motor 1;

[0110] S5, such as Fig.13 As shown in (e), the first linear displacement driving source drives the lever 34 to move toward the first end of the worm accommodating portion 111, so that the lever 34 returns to the second position; then the second linear displacement driving source 32 works to drive the lever 34 to move along the Z direction, so that the lever 34 returns to the first position; finally, the third linear displacement driving source 33 works to drive the lever 34 to move along the X direction, and the lever 34 returns to the initial position.

[0111] Combination Figure 8-9 and Figure 12-13 It can be seen that in the above step S2, when the motor 1 to be tested is the first motor, the first position is located directly below the first helical tooth 151, and the second linear displacement driving source 32 drives the lever 34 to move upward, so that the first end 3421 is inserted into the tooth gap of the first helical tooth 151; when the motor 1 to be tested is the second motor, the first position is located directly above the second helical tooth 152, and the second linear displacement driving source 32 drives the lever 34 to move downward, so that the second end 3422 is inserted into the tooth gap of the second helical tooth 152.

[0112] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A motor worm looseness measuring device, characterized in that: include: A motor, comprising a motor part, a worm driven by the motor part to rotate, and a housing, wherein the housing is provided with a worm housing part for housing the worm, wherein a first end of the worm housing part is connected to the motor part, and a second end thereof is sealed; A motor fixing mechanism, used for fixing the motor so that the worm extends along the Y direction; The lever moving mechanism comprises a lever, a displacement sensor connected to the lever, and a moving assembly for driving the lever to move along the X direction, the Y direction and the Z direction, wherein the lever comprises an insert for inserting into the spiral teeth of the worm; and the displacement sensor is used to detect the displacement of the lever along the Y direction.

2. The motor worm looseness measuring device according to claim 1, characterized in that: The motor fixing mechanism comprises: A back plate, on the surface of which facing the lever moving mechanism, a first positioning portion and a profiling portion are provided, wherein the first positioning portion is used to be inserted and matched with a first positioning hole provided on the shell, and the profiling portion includes a profiling surface matched with the outer contour of the shell; A pressure plate is arranged opposite to the back plate, and a second positioning portion is arranged on the surface of the pressure plate facing the back plate, and the second positioning portion is used to be inserted and matched with a second positioning hole arranged on the shell, and the pressure plate is also provided with an opening for the lever to pass through; The pressing plate linear displacement driving source is used to drive the pressing plate to approach or move away from the back plate.

3. The motor worm looseness measuring device according to claim 2, characterized in that: A tension spring is also connected between the back plate and the pressure plate.

4. The motor worm looseness measuring device according to claim 2, characterized in that: The number of the contoured portions is two, and the two contoured portions are distributed on the back plate along the Z direction.

5. The motor worm looseness measuring device according to claim 1, characterized in that: The mobile assembly comprises: A mounting seat, on which the lever and the displacement sensor are respectively arranged; A first mounting portion, on which a first guide rail and a first linear displacement driving source are respectively provided, the first guide rail extends along the Y direction, and the first linear displacement driving source is used to drive the mounting seat to move along the first guide rail; A second mounting portion, on which a second guide rail and a second linear displacement driving source are respectively provided, the second guide rail extends along the Z direction, and the second linear displacement driving source is used to drive the first mounting portion to move along the second guide rail; The third linear displacement driving source is arranged on the second mounting portion and is used for driving the second mounting portion to move along a third guide rail. The third guide rail is fixedly arranged and extends along the X direction.

6. The motor worm looseness measuring device according to claim 5, characterized in that: A nitrogen spring is also provided at one end of the third guide rail close to the motor fixing mechanism.

7. The motor worm looseness measuring device according to claim 1, characterized in that: The insert includes a first end and a second end distributed along the Z direction, and both the first end and the second end can be inserted into the helical teeth of the worm.

8. The motor worm looseness measuring device according to claim 7, characterized in that: The insert is in a rhombus shape.

9. The motor worm looseness measuring device according to claim 1, characterized in that: The second end of the worm accommodating portion is open, and a first bushing is provided therein. One end of the first bushing is connected to a seal for sealing the second end, and the other end is connected to a second bushing. The free end of the worm passes through the second bushing and extends toward the direction of the seal.

10. A method for measuring the looseness of a motor worm according to any one of claims 1 to 9, characterized in that: The following steps are involved: The motor to be tested is fixed by the motor fixing mechanism; The moving assembly drives the lever to move so that the insert is inserted into the spiral teeth of the worm; The moving assembly drives the shifting rod to drive the screw to move toward the first end of the worm accommodating portion, and the displacement sensor returns to zero; The moving assembly drives the shifting rod to drive the screw to move toward the second end of the worm accommodating portion, and the displacement value obtained by the displacement sensor is the looseness of the worm of the motor.

Images