CN114354387A - Brake block bending resistance test equipment for new energy automobile - Google Patents
Brake block bending resistance test equipment for new energy automobile Download PDFInfo
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- CN114354387A CN114354387A CN202210027751.7A CN202210027751A CN114354387A CN 114354387 A CN114354387 A CN 114354387A CN 202210027751 A CN202210027751 A CN 202210027751A CN 114354387 A CN114354387 A CN 114354387A
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Abstract
The invention relates to the technical field of bending test equipment, and discloses brake pad bending resistance test equipment for a new energy automobile, which comprises: the brake pad bending device comprises a supporting disk, a rotating part, a first telescopic part, a horizontal moving mechanism, a second telescopic part and a measuring instrument, wherein a groove is formed in the upper end of the supporting disk, a supporting plate is vertically fixed on one side of the upper end of the supporting disk, two bearing plates are fixed on the other side of the upper end of the supporting disk, the rotating part is arranged in the groove, the first telescopic part is connected with the supporting plate through a vertical translation part, the vertical translation part is arranged on the inner side of the supporting plate, a brake disk and a pushing part are fixed on the telescopic end of the first telescopic part, the horizontal moving mechanism is arranged between the two bearing plates, the fixed end of the second telescopic part is connected with the horizontal moving mechanism, a pressing bending mechanism is fixed on the telescopic end of the second telescopic part, the measuring instrument is connected with the horizontal moving mechanism through a fixing part, and the measuring instrument corresponds to the pressing bending mechanism.
Description
Technical Field
The invention relates to the technical field of bending test equipment, in particular to brake pad bending resistance test equipment for a new energy automobile.
Background
An automobile brake pad, also called an automobile brake shoe, refers to a friction material fixed on a brake drum or a brake disc rotating with a wheel, wherein a friction lining and a friction pad bear external pressure to generate friction so as to achieve the purpose of decelerating a vehicle, and generally comprises a steel plate, an adhesive heat-insulating layer and a friction block.
Brake block is after making, need test to the resistant crookedness of brake block, and the device that tests to the resistant crookedness of brake block that has appeared at present, the device is many through fixing brake block one end, utilizes to push down the mechanism and carries out pressure loading to its opposite side and detect its crookedness through the measuring apparatu again.
However, in the prior art, only the bending degree of the brake pad before use can be measured, and the actual situation is that the brake pad is fixed on the brake disc in the use process, one part of the brake pad is clamped in the brake disc, and the part exposed out of the brake disc can contact with the wheel to generate friction for braking, so that the part where the brake pad is bent often appears at the edge part of the brake disc and the edge part of the brake disc.
Disclosure of Invention
The invention provides brake pad bending resistance testing equipment for a new energy automobile, which can better meet the detection of brake pad bending under the real use condition.
The invention provides brake pad bending resistance testing equipment for a new energy automobile, which comprises:
the supporting plate is provided with a groove at the upper end, a plurality of supporting legs are fixed at the lower end of the supporting plate, a supporting plate is vertically fixed at one side of the upper end of the supporting plate, and two parallel bearing plates are vertically fixed at the other side of the upper end of the supporting plate;
the rotating piece is arranged in the groove;
the first telescopic piece is connected with the supporting plate through a vertical translation piece, the vertical translation piece is arranged on the inner side of the supporting plate so as to enable the first telescopic piece to move along the vertical direction, and a brake disc and a pushing piece are fixed at the telescopic end of the first telescopic piece;
the horizontal moving mechanism is arranged between the two bearing plates;
the fixed end of the second telescopic piece is connected with the horizontal moving mechanism so as to enable the second telescopic piece to move along the width direction of the supporting plate, and the telescopic end of the second telescopic piece is fixed with the pressing and bending mechanism;
and the measuring instrument is connected with the horizontal moving mechanism through the fixing piece and corresponds to the position of the downward-pressing bending mechanism.
Optionally, the rotating member comprises:
the first motor is fixed at the bottom of the supporting disc, a cavity is formed in the supporting disc and communicated with the groove, and an output shaft of the first motor upwards penetrates through the supporting disc and extends into the cavity;
the driving gear is arranged in the cavity and is fixedly connected with an output shaft of the first motor;
the driven gear is arranged in the groove and is rotationally connected with the groove bottom of the groove through a rotating shaft, the driven gear is meshed with the driving gear, and the upper end face of the driven gear is not lower than the upper end face of the supporting plate.
Optionally, the pusher comprises:
the closed end of the vertical fixing sleeve is fixedly connected with the telescopic end of the first telescopic piece, the open end of the vertical fixing sleeve is vertically downward, and the lower end surface of the vertical fixing sleeve is provided with an accommodating groove;
the spring is fixed in the accommodating groove;
the extension rod is partially positioned in the accommodating groove and is connected with the spring;
and the horizontal push rod is vertically fixed at the lower end of the extension rod.
Optionally, the horizontal moving mechanism comprises:
the second motor is fixed on one bearing plate, and an output shaft of the second motor is arranged along the width direction of the supporting plate;
the screw is arranged between the two bearing plates and is connected with an output shaft of the second motor;
the movable plate is provided with internal threads, the movable plate is in threaded connection with the screw, and the fixed end of the second telescopic piece is connected with the movable plate;
and the guide rods are arranged in parallel to the screw rods, the guide rods are fixed between the two bearing plates, and the moving plate simultaneously penetrates through the guide rods.
Optionally, the vertical translator comprises:
the top plate is vertically fixed at the top of the supporting plate, and the upper end surface of the supporting plate is provided with an annular groove;
the electromagnetic coil is arranged in the annular groove;
one side of the sliding plate is in sliding fit with the side face of the supporting plate along the vertical direction, the other side of the sliding plate is connected with the fixed end of the first telescopic piece, and the lower end face of the sliding plate is provided with a placing groove;
the magnet is fixed in the placing groove, and the magnet is opposite to the electromagnetic coil;
the first spring is connected between the sliding plate and the supporting plate.
Optionally, the vertical translation member further includes a guide rod, the guide rod is vertically fixed between the top plate and the support plate, the sliding plate is arranged on the guide rod in a penetrating manner, and the first spring is sleeved on the periphery of the guide rod.
Optionally, the vertical translation member further includes a second spring, the second spring is sleeved on the periphery of the guide rod, the second spring is located between the top plate and the sliding plate, and the second spring is opposite to the first spring in elasticity.
Optionally, the first extensible member and the second extensible member are both electric extensible rods.
Compared with the prior art, the invention has the beneficial effects that: the brake pad is placed between the rotating part and the brake disc, the brake pad can be rubbed by the rotation of the rotating part, the temperature of the brake pad is changed by controlling the rotation speed of the rotating part, after a plurality of temperature intervals under daily use are reached, the brake disc is driven by the vertical translation part to be slightly raised and separated from the brake pad, the pushing part pushes the brake pad to move to the edge of the supporting disc by the extension of the first telescopic part, then the brake pad is pressed partially by the driving of the vertical translation part, the downward pressing and bending mechanism is used for pressing the edge, which is contacted with the brake disc, of the brake pad when the downward pressing and bending mechanism is moved by matching of the horizontal moving mechanism and the second telescopic part, and the bending degree of the brake pad at each position is measured by the measuring instrument, so that the bending degree of the brake pad at the position which is easy to bend under the working state is obtained.
Drawings
Fig. 1 is a front view of brake pad bending resistance testing equipment for a new energy automobile, provided by an embodiment of the invention;
FIG. 2 is a top view of brake pad bending resistance testing equipment for a new energy automobile, provided by the embodiment of the invention;
FIG. 3 is a schematic structural view of a pusher member provided in accordance with an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a horizontal movement mechanism according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a vertical translation member according to an embodiment of the present invention.
Detailed Description
An embodiment of the present invention will be described in detail below with reference to the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the embodiment.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing technical solutions of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
An automobile brake pad, also called an automobile brake shoe, refers to a friction material fixed on a brake drum or a brake disc rotating with a wheel, wherein a friction lining and a friction pad bear external pressure to generate friction so as to achieve the purpose of decelerating a vehicle, and generally comprises a steel plate, an adhesive heat-insulating layer and a friction block.
Brake block is after making, need test to the resistant crookedness of brake block, and the device that tests to the resistant crookedness of brake block that has appeared at present, the device is many through fixing brake block one end, utilizes to push down the mechanism and carries out pressure loading to its opposite side and detect its crookedness through the measuring apparatu again.
However, in the prior art, only the bending degree of the brake pad before use can be measured, and the actual situation is that the brake pad is fixed on the brake disc in the use process, one part of the brake pad is clamped in the brake disc, and the part exposed out of the brake disc can contact with the wheel to generate friction for braking, so that the part where the brake pad is bent often appears at the edge part of the brake disc and the edge part of the brake disc.
Based on the above problems, the invention provides brake pad bending resistance test equipment for a new energy automobile, which can better meet the detection of brake pad bending resistance under real use conditions, and a scheme of the brake pad bending resistance test equipment for the new energy automobile is described in detail below with reference to the accompanying drawings, wherein fig. 1 is a front view of the brake pad bending resistance test equipment for the new energy automobile provided by the embodiment of the invention, fig. 2 is a top view of the brake pad bending resistance test equipment for the new energy automobile provided by the embodiment of the invention, fig. 3 is a structural schematic diagram of a pushing member provided by the embodiment of the invention, fig. 4 is a structural schematic diagram of a horizontal moving mechanism provided by the embodiment of the invention, and fig. 5 is a structural schematic diagram of a vertical translation member provided by the embodiment of the invention.
As shown in fig. 1-2, the brake pad bending resistance testing device for a new energy automobile provided by the embodiment of the invention comprises: the device comprises a supporting disk 1, a rotating part 5, a first telescopic part 6, a horizontal moving mechanism 10, a second telescopic part 11 and a measuring instrument 13, wherein the upper end of the supporting disk 1 is provided with a groove 2, the lower end of the supporting disk 1 is fixedly provided with a plurality of supporting legs 3, one side of the upper end of the supporting disk 1 is vertically fixedly provided with a supporting plate 4, the other side of the upper end of the supporting disk 1 is vertically fixedly provided with two parallel bearing plates 9, the rotating part 5 is arranged in the groove 2, the first telescopic part 6 is connected with the supporting plate 4 through a vertical translation part 7, the vertical translation part 7 is arranged on the inner side of the supporting plate 4 so as to enable the first telescopic part 6 to move along the vertical direction, the telescopic end of the first telescopic part 6 is fixedly provided with a brake disk 8 and a pushing part 16, the horizontal moving mechanism 10 is arranged between the two bearing plates 9, the fixed end of the second telescopic part 11 is connected with the horizontal moving mechanism 10 so as to enable the second telescopic part 11 to move along the width direction of the supporting disk 1, the telescopic end of the second telescopic piece 11 is fixed with a press bending mechanism 12, a measuring instrument 13 is connected with the horizontal moving mechanism 10 through a fixing piece 14, and the measuring instrument 13 corresponds to the press bending mechanism 12 in position.
In this embodiment, a limit cross piece can be adhered or fixed to the edge of the brake pad 17 by other fixing means, so that the position of the lowest end of the pushing member 16 can be limited to avoid contacting the support plate 1.
The brake pad is placed between the rotating part and the brake disc, the brake pad can be rubbed by the rotation of the rotating part, the temperature of the brake pad is changed by controlling the rotation speed of the rotating part, after a plurality of temperature intervals under daily use are reached, the brake disc is driven by the vertical translation part to be slightly raised and separated from the brake pad, the pushing part pushes the brake pad to move to the edge of the supporting disc by the extension of the first telescopic part, then the brake pad is pressed partially by the driving of the vertical translation part, the downward pressing and bending mechanism is used for pressing the edge, which is contacted with the brake disc, of the brake pad when the downward pressing and bending mechanism is moved by matching of the horizontal moving mechanism and the second telescopic part, and the bending degree of the brake pad at each position is measured by the measuring instrument, so that the bending degree of the brake pad at the position which is easy to bend under the working state is obtained.
Again, the rotary member 5 includes: first motor 500, driving gear 501 and driven gear 502, first motor 500 is fixed in the bottom of supporting disk 1, a cavity 15 has in the supporting disk 1, cavity 15 and recess 2 intercommunication, the output shaft of first motor 500 upwards passes supporting disk 1 and extends to in the cavity 15, driving gear 501 sets up in cavity 15, driving gear 501 links firmly with first motor 500's output shaft, driven gear 502 sets up in recess 2, driven gear 502 is connected through the rotation axis 503 and the tank bottom rotation of recess 2, driven gear 502 meshes with driving gear 501 mutually, the up end of driven gear 502 is not less than the up end of supporting disk 1.
In this embodiment, the rotation speed of the driven gear 502 is adjusted by adjusting the rotation speed of the first motor 500, so that the friction force of the driven gear to the brake pad 17 thereon is different, thereby changing the temperature of the brake pad 17.
Referring to fig. 3, pusher 16 includes: the vertical fixing sleeve 160, the spring 162, the extension bar 163 and the horizontal push rod 164, wherein the closed end of the vertical fixing sleeve 160 is fixedly connected with the telescopic end of the first telescopic part 6, the open end of the vertical fixing sleeve 160 is vertically downward, the lower end face of the vertical fixing sleeve 160 is provided with a receiving groove 161, the spring 162 is fixed in the receiving groove 161, the extension bar 163 is partially positioned in the receiving groove 161 and connected with the spring 162, and the horizontal push rod 164 is vertically fixed at the lower end of the extension bar 163.
Referring to fig. 4, the horizontal movement mechanism 10 includes: the second motor 100 is fixed on one bearing plate 9, an output shaft of the second motor 100 is arranged along the width direction of the supporting plate 1, the screw 101 is arranged between the two bearing plates 9, the screw 101 is connected with the output shaft of the second motor 100, the moving plate 102 is provided with internal threads, the moving plate 102 is in threaded connection with the screw 101, the fixed end of the second telescopic part 11 is connected with the moving plate 102, the guide rod 103 is arranged in parallel with the screw 101, the guide rod 103 is fixed between the two bearing plates 9, and the moving plate 102 simultaneously penetrates through the guide rod 103.
The second motor 100 drives the screw 101 to rotate forwards or backwards, so that the moving plate 102 can move back and forth along the width direction of the supporting plate 1, the second telescopic piece 11 can move back and forth along the width direction of the supporting plate 1, the movement of the press bending mechanism 12 and the measuring instrument 13 along the width direction of the supporting plate 1 can be realized by matching with the extension and retraction of the second telescopic piece 11 in the vertical direction, and because the edge of the brake pad 17 contacting with the brake disc 8 is not a straight line but a curve, the places where the brake pad 17 is located at different edges can be contacted by the press bending mechanism 12 and the measuring instrument 13 by matching with the extension or shortening of the first telescopic piece 6, so that the bending resistance of each position of the brake pad 17 in the use state can be measured.
Referring to fig. 5, the vertical translator 7 comprises: the top plate 700 is vertically fixed on the top of the supporting plate 4, the upper end surface of the supporting plate 1 is provided with an annular groove 702, the electromagnetic coil 703 is arranged in the annular groove 702, one side of the sliding plate 704 is in sliding fit with the side surface of the supporting plate 4 along the vertical direction, the other side of the sliding plate 704 is connected with the fixed end of the first telescopic piece 6, the lower end surface of the sliding plate 704 is provided with a placing groove 705, the magnet 706 is fixed in the placing groove 705, the magnet 706 is opposite to the electromagnetic coil 703, and the first spring 707 is connected between the sliding plate 704 and the supporting plate 1.
The working principle is as follows: in order to ensure that the brake disc 8 can be quickly contacted with or separated from the brake pad 17 and tightly press the brake pad 17, in this embodiment, a forward current or a reverse current is supplied to the electromagnetic coil 703, so that the electromagnetic coil 703 and the magnet 706 are attracted or repelled with each other, when the electromagnetic coil 703 and the magnet 706 are attracted with each other, the first telescopic member 6 drives the brake disc 8 to quickly move down to tightly press the brake pad 17, on one hand, the first spring 707 can buffer the kinetic energy of the brake disc 8 to prevent the brake disc 17 from being deformed, on the other hand, the first spring can play a limiting role, and the lowest position of the brake disc 8 is ensured to just tightly press the brake pad 17.
In order to avoid the position deviation of the sliding plate 704 in the up-and-down moving process driven by the magnet 706, in this embodiment, the vertical translation member 7 further includes a guide rod 701, the guide rod 701 is vertically fixed between the top plate 700 and the supporting plate 1, the sliding plate 704 is arranged on the guide rod 701 in a penetrating manner, the first spring 707 is sleeved on the periphery of the guide rod 701, and the guide rod 701 and the supporting plate 4 are matched to guide the sliding plate 704 to move up and down in the vertical direction.
Optionally, the vertical translation element 7 further includes a second spring 708, the second spring 708 is sleeved on the outer periphery of the guide rod 701, the second spring 708 is located between the top plate 700 and the sliding plate 704, the second spring 708 has an elastic force opposite to that of the first spring 707, and the second spring 708 also has a buffering effect.
Optionally, the first extensible member 6 and the second extensible member 11 are both electric extensible rods.
The above disclosure is only for a few specific embodiments of the present invention, however, the present invention is not limited to the above embodiments, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present invention.
Claims (8)
1. The utility model provides a new energy automobile is with resistant crookedness test equipment of brake block which characterized in that includes:
the supporting device comprises a supporting plate (1), a groove (2) is formed in the upper end of the supporting plate (1), a plurality of supporting legs (3) are fixed to the lower end of the supporting plate (1), a supporting plate (4) is vertically fixed to one side of the upper end of the supporting plate (1), and two parallel bearing plates (9) are vertically fixed to the other side of the upper end of the supporting plate (1);
the rotating piece (5) is arranged in the groove (2);
the first telescopic piece (6) is connected with the supporting plate (4) through a vertical translation piece (7), the vertical translation piece (7) is arranged on the inner side of the supporting plate (4) so that the first telescopic piece (6) can move along the vertical direction, and a brake disc (8) and a pushing piece (16) are fixed at the telescopic end of the first telescopic piece (6);
the horizontal moving mechanism (10) is arranged between the two bearing plates (9);
a fixed end of the second telescopic piece (11) is connected with the horizontal moving mechanism (10) so that the second telescopic piece (11) can move along the width direction of the supporting plate (1), and a pressing and bending mechanism (12) is fixed at the telescopic end of the second telescopic piece (11);
and the measuring instrument (13) is connected with the horizontal moving mechanism (10) through a fixing piece (14), and the measuring instrument (13) corresponds to the position of the downward-pressing bending mechanism (12).
2. The brake pad bending resistance test apparatus for the new energy automobile as claimed in claim 1, wherein the rotary member (5) comprises:
the first motor (500) is fixed at the bottom of the support disc (1), a cavity (15) is formed in the support disc (1), the cavity (15) is communicated with the groove (2), and an output shaft of the first motor (500) upwards penetrates through the support disc (1) and extends into the cavity (15);
the driving gear (501) is arranged in the cavity (15), and the driving gear (501) is fixedly connected with an output shaft of the first motor (500);
the driven gear (502) is arranged in the groove (2), the driven gear (502) is rotatably connected with the groove bottom of the groove (2) through a rotating shaft (503), the driven gear (502) is meshed with the driving gear (501), and the upper end face of the driven gear (502) is not lower than that of the supporting disc (1).
3. The brake pad bending resistance test apparatus for the new energy automobile as claimed in claim 1, wherein the pusher (16) comprises:
the closed end of the vertical fixing sleeve (160) is fixedly connected with the telescopic end of the first telescopic piece (6), the open end of the vertical fixing sleeve (160) faces downwards vertically, and the lower end face of the vertical fixing sleeve (160) is provided with an accommodating groove (161);
a spring (162) fixed in the accommodation groove (161);
a protruding rod (163) partially located in the receiving groove (161) and connected to the spring (162);
and the horizontal push rod (164) is vertically fixed at the lower end of the extension rod (163).
4. The brake pad bending resistance test device for the new energy automobile as claimed in claim 1, wherein the horizontal movement mechanism (10) comprises:
the second motor (100) is fixed on one bearing plate (9), and an output shaft of the second motor (100) is arranged along the width direction of the supporting plate (1);
the screw (101) is arranged between the two bearing plates (9), and the screw (101) is connected with an output shaft of the second motor (100);
the moving plate (102) is provided with internal threads, the moving plate (102) is in threaded connection with the screw (101), and the fixed end of the second telescopic piece (11) is connected with the moving plate (102);
the guide rods (103) are arranged in parallel to the screw rods (101), the guide rods (103) are fixed between the two bearing plates (9), and the moving plate (102) penetrates through the guide rods (103) simultaneously.
5. The brake pad bending resistance test apparatus for the new energy automobile as claimed in claim 1, wherein the vertical translation member (7) comprises:
the top plate (700) is vertically fixed on the top of the supporting plate (4), and the upper end surface of the supporting plate (1) is provided with an annular groove (702);
an electromagnetic coil (703) disposed within the annular recess (702);
one side of the sliding plate (704) is in sliding fit with the side face of the supporting plate (4) along the vertical direction, the other side of the sliding plate (704) is connected with the fixed end of the first telescopic piece (6), and the lower end face of the sliding plate (704) is provided with a placing groove (705);
a magnet (706) fixed in the placement groove (705), wherein the magnet (706) is opposite to the electromagnetic coil (703);
a first spring (707) connected between the sliding plate (704) and the support plate (1).
6. The brake pad bending resistance test equipment for the new energy automobile as claimed in claim 5, wherein the vertical translation member (7) further comprises a guide rod (701), the guide rod (701) is vertically fixed between the top plate (700) and the support plate (1), the sliding plate (704) is arranged on the guide rod (701) in a penetrating manner, and the first spring (707) is sleeved on the periphery of the guide rod (701).
7. The brake pad bending resistance test device for the new energy automobile as claimed in claim 6, wherein the vertical translation member (7) further comprises a second spring (708), the second spring (708) is sleeved on the outer periphery of the guide rod (701), the second spring (708) is located between the top plate (700) and the sliding plate (704), and the second spring (708) is opposite to the first spring (707) in elasticity.
8. The bending resistance test equipment for the brake pad for the new energy automobile as claimed in claim 1, wherein the first telescopic member (6) and the second telescopic member (11) are both electric telescopic rods.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210027751.7A CN114354387B (en) | 2022-01-11 | 2022-01-11 | Brake block bending resistance test equipment for new energy automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210027751.7A CN114354387B (en) | 2022-01-11 | 2022-01-11 | Brake block bending resistance test equipment for new energy automobile |
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| Publication Number | Publication Date |
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| CN114354387A true CN114354387A (en) | 2022-04-15 |
| CN114354387B CN114354387B (en) | 2023-08-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210027751.7A Active CN114354387B (en) | 2022-01-11 | 2022-01-11 | Brake block bending resistance test equipment for new energy automobile |
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| SU894415A1 (en) * | 1980-04-18 | 1981-12-30 | Предприятие П/Я А-1697 | Stand for testing vehicle suspension springs |
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| CN209147887U (en) * | 2019-01-04 | 2019-07-23 | 山东省梁山神力汽车配件有限公司 | A kind of brake block thickness detection apparatus |
| CN209140458U (en) * | 2018-09-30 | 2019-07-23 | 湖北德宜智精密机械有限公司 | Drum-type automobile brake block drilling feed device |
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2022
- 2022-01-11 CN CN202210027751.7A patent/CN114354387B/en active Active
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| SU894415A1 (en) * | 1980-04-18 | 1981-12-30 | Предприятие П/Я А-1697 | Stand for testing vehicle suspension springs |
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| CN111547098A (en) * | 2020-06-09 | 2020-08-18 | 中铁建电气化局集团南方工程有限公司 | Multifunctional rail transit brake system and method |
| CN112630052A (en) * | 2021-01-07 | 2021-04-09 | 钟英武 | Brake block bending resistance test equipment for new energy automobile |
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|---|---|
| CN114354387B (en) | 2023-08-18 |
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