A double-piston electronic caliper, piston adjusting tool and piston adjusting method

Abstract

The present application belongs to the technical field of automobile braking, and particularly relates to a double-piston electronic caliper, a piston adjusting tool and a piston adjusting method. The double-piston electronic caliper comprises a caliper body, double pistons and a synchronous pressing plate. The caliper body has a pair of piston cavities. A pair of pistons are arranged in the pair of piston cavities respectively. The synchronous pressing plate is connected to the end faces of the pair of pistons simultaneously and used for contacting with a friction plate. The double-piston electronic caliper comprises the caliper body and the double pistons. By arranging a synchronous pressing plate on the end face of the double pistons, the two pistons are locked simultaneously by the synchronous pressing plate, so that the double pistons are always flush and synchronous. The synchronous pressing plate is in full contact with the friction plate through the plane of the synchronous pressing plate, so that the friction plate pressure stress distribution is uniform, thereby ensuring the stable and reliable braking.

Description

Technical Field

[0001] This invention belongs to the field of automotive braking technology, and particularly relates to a dual-piston electronic caliper, piston adjustment fixture, and piston adjustment method. Background Technology

[0002] As is well known, when the aspect ratio of the friction pad is greater than 1.8, a dual-piston design is generally used to achieve uniform internal compressive stress distribution within the friction pad, ensuring stable and reliable braking. In existing technologies, the most common dual-piston brake caliper power transmission mechanism consists of two independent power output transmission mechanisms: two motors, two separate reduction gears, and a power transmission mechanism, each driving and controlling one piston to provide braking force. The disadvantages of this technology are: high difficulty in controlling the electronic control system, complex mechanical components with many parts, large space occupation, and high overall cost.

[0003] Chinese patent application CN202120356274.X discloses a dual-piston linkage electronic parking caliper. The drive mechanism uses a motor to drive a set of primary worm gears, which in turn drive two sets of secondary worm gears, thereby driving two sets of screw sleeves to drive two pistons respectively. This solution achieves a simple dual-piston linkage scheme driven by a single motor. However, due to the single-motor-driven dual-piston linkage structure, there is a problem of asynchronous operation between the two pistons. That is, one piston may press against the friction plate first, while the other piston fails to do so, or the pressure exerted by the two pistons on the friction plate may be inconsistent. In severe cases, this can affect the braking effect and compromise safety. Summary of the Invention

[0004] This application provides a dual-piston electronic caliper, a piston adjustment fixture, and a piston adjustment method to solve the problem of asynchronous operation of the two pistons in existing electronic calipers.

[0005] The first aspect of this application provides a dual-piston electronic caliper, comprising:

[0006] The clamp body has a pair of piston chambers;

[0007] A pair of pistons, each disposed within a pair of piston chambers;

[0008] Synchronous pressure plates are connected to the end faces of both pistons and are used to contact the friction plates.

[0009] The aforementioned dual-piston electronic caliper includes a caliper body and two pistons. By configuring a synchronous pressure plate on the end face of the two pistons, the two pistons are locked simultaneously by the synchronous pressure plate, so that the two pistons are always flush and synchronized. By ensuring that the plane of the synchronous pressure plate is in complete contact with the friction pad, the compressive stress distribution of the friction pad can be uniform, thereby ensuring stable and reliable braking.

[0010] In one embodiment, the synchronous pressure plate is connected to the center of the piston end face.

[0011] In one embodiment, the end face of the piston and the opposite face of the synchronous pressure plate have a socket structure for fitting, and the socket structure is coaxial with the piston.

[0012] In one embodiment, a rectangular annular groove is formed on the inner wall of the piston cavity, and a rectangular rubber ring is disposed in the rectangular annular groove. The rectangular rubber ring forms an interference fit with the outer wall of the piston and the rectangular annular groove.

[0013] In one embodiment, the dual-piston electronic caliper further includes:

[0014] A bridge plate is assembled and connected with the clamp body, and the bridge plate is configured to install inner and outer friction plates.

[0015] In one embodiment, the bridge plate has a pair of bridge arms, the ends of which are fixedly connected to the clamp body; the cross-section of the bridge arm at half its height is coplanar with the plane formed by the axes of the pair of pistons.

[0016] In one embodiment, the dual-piston electronic caliper further includes:

[0017] A transmission mechanism is configured to form a ball screw pair with the piston.

[0018] In one embodiment, one piston and its corresponding transmission mechanism are configured to rotate clockwise, and the other piston and its corresponding transmission mechanism are configured to rotate counterclockwise.

[0019] In one embodiment, the clamp body is provided with a second through hole and a third through hole. The third through hole is configured to connect a pair of piston chambers, and the second through hole is configured to connect the piston chambers to the outside. The second through hole is provided with a valve.

[0020] In one embodiment, the transmission mechanism has a fourth through hole, which is configured to connect the interior of the piston with the piston cavity.

[0021] In one embodiment, the root of the piston cavity inner wall has an annular groove, and the second through hole, the third through hole and the fourth through hole are all connected to the annular groove.

[0022] In one embodiment, the dual-piston electronic caliper further includes:

[0023] The drive mechanism includes a motor, a first-stage worm gear and two second-stage worm gears. The motor is driven by the first-stage worm gear, the first-stage worm gear is driven by both second-stage worm gears, and the second-stage worm gears are driven by the transmission mechanism.

[0024] A second aspect of this application provides a piston adjustment fixture for synchronously adjusting a pair of pistons in any of the above-mentioned dual-piston electronic calipers, including:

[0025] The tooling plate has an adjustment surface on its first surface; a pair of first through holes are provided on the tooling plate, both of which are located on the adjustment surface, and the pair of first through holes 104 are coaxially spaced with the pair of pistons.

[0026] In one embodiment, the first surface of the tooling plate is further provided with a boss, which is located on the side of the adjustment surface.

[0027] In one embodiment, the tooling plate has bolt holes at the boss, and the tooling plate is configured to be connected to the clamp body using bolts.

[0028] A third aspect of this application provides a piston adjustment method for synchronously adjusting a pair of pistons in any of the above-mentioned dual-piston electronic calipers, including:

[0029] Connect any of the piston adjustment fixtures described above to the clamp body;

[0030] Activate the dual-piston electronic caliper until one of the pistons contacts the adjustment surface;

[0031] Use a rotary adjustment tool to drive the other piston to rotate until it contacts the adjustment surface.

[0032] In one embodiment, the rotary adjustment tool is a torque wrench, and the end face of the piston is provided with a connecting part that matches the torque wrench; by cooperating with the torque wrench and the connecting part, a pair of pistons are rotated and adjusted until the torque of the pair of pistons is the same or within a certain range.

[0033] In one embodiment, the dual-piston electronic caliper is activated, and the pair of pistons are retracted and extended repeatedly until the torque of the pair of pistons is the same or within a certain range.

[0034] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0035] The accompanying drawings in this application are for illustrating preferred embodiments and to facilitate a clear understanding by those skilled in the art of various other advantages and benefits, and should not be construed as limiting the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings.

[0036] Figure 1 This is a perspective view of a dual-piston electronic caliper in one embodiment of this application.

[0037] Figure 2 This is a front perspective view of the clamp body in one embodiment of this application.

[0038] Figure 3 This is a cross-sectional schematic diagram of the clamp body and bridge plate in one embodiment of this application.

[0039] Figure 4 This is a schematic diagram of the drive mechanism in one embodiment of this application.

[0040] Figure 5 This is a cross-sectional view of the dual-piston electronic caliper located at the piston in one embodiment of this application.

[0041] Figure 6 This is a cross-sectional schematic diagram of the piston and transmission mechanism in one embodiment of this application.

[0042] Figure 7 This is a three-dimensional view of the back of the clamp body in one embodiment of this application.

[0043] Figure 8 This is a cross-sectional view of the clamp body located at the valve in one embodiment of this application.

[0044] Figure 9 This is a schematic diagram of a piston adjustment fixture in one embodiment of this application.

[0045] Figure 10 This is a schematic diagram of the clamp body in one embodiment of this application.

[0046] Figure 11 This is a schematic diagram of the clamp body and piston adjustment fixture after assembly in one embodiment of this application.

[0047] Figure 12 This is a schematic diagram of the piston end face in one embodiment of this application.

[0048] Figure 13This is a schematic diagram of the piston end face in one embodiment of this application.

[0049] Figure 14 This is a schematic diagram of the piston end face in one embodiment of this application.

[0050] Figure 15 This is a schematic diagram of the piston end face in one embodiment of this application.

[0051] Figure 16 This is a schematic diagram of the piston end face in one embodiment of this application.

[0052] Reference numerals in the attached figures: Piston adjusting fixture 100, fixture plate 101, adjusting surface 102, bolt hole 103, first through hole 104; torque wrench 200; clamp body 300, bolt 301, annular groove 302, second through hole 303, third through hole 304, rectangular rubber ring 305; piston 400, connecting part 401, screw hole 402; drive mechanism 500, motor 501, first stage worm gear 502, second stage worm gear 503; bridge plate 600; bridge wall 601; synchronous pressure plate 700, screw 701; transmission mechanism 800, first sealing ring 801, flat bearing 802, fourth through hole 803; valve 900. Detailed Implementation

[0053] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to specific examples. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0054] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0055] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more (including two), unless otherwise explicitly defined.

[0056] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0057] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0058] In existing dual-piston linkage electronic parking calipers, the drive mechanism uses a motor to drive a primary worm gear, which in turn drives two secondary worm gears, thereby driving two sets of screw sleeves to drive two pistons respectively. Because it's a single-motor-driven dual-piston linkage structure, misalignment is inevitable during the process of the two sets of screw sleeves driving the two pistons. The two pistons may not be synchronized; one piston may press against the friction plate first, while the other fails to do so, or the pressure applied by the two pistons may be inconsistent. This can severely affect braking performance and compromise safety. If two motors drive the two sets of screw sleeves separately, the vehicle's computer can control the two motors to asynchronously drive the two sets of screw sleeves, thus resynchronizing the two pistons. This is not possible with a single-motor drive.

[0059] Please see Figures 1 to 8The first aspect of this application provides a dual-piston electronic caliper, which includes a caliper body 300, a pair of pistons 400, and a synchronizing pressure plate 700. The caliper body 300 has a pair of piston chambers, and the pair of pistons 400 are respectively fitted into the pair of piston chambers. The end faces of the pair of pistons 400 are connected by the same synchronizing pressure plate 700, which is used to contact a friction pad (not shown). The dual-piston electronic caliper, by configuring a synchronizing pressure plate 700 on the end faces of the dual pistons 400, simultaneously locks the two pistons 400, ensuring that the movement of the dual pistons 400 is always synchronized and flush. Furthermore, a plane of the synchronizing pressure plate 700 directly contacts the friction pad. The synchronized movement of the dual pistons 400 drives the synchronizing pressure plate 700 to push the friction pad for braking. The friction pad experiences uniform compressive stress distribution from the synchronizing pressure plate 700, ensuring stable and reliable braking.

[0060] Specifically, the clamp body 300 is generally made of aluminum alloy through integral casting and machining, while the synchronous pressure plate 700 adopts a waist-shaped plate structure. The synchronous pressure plate 700 and the end face of the piston 400 can be fixedly connected in the form of adhesive bonding, welding, screw bonding, etc. For example, 3M adhesive can be applied to the end face of the piston 400 first, and then the synchronous pressure plate 700 can be glued together. Subsequently, welding, screw bonding, and other forms of connection can be used to make the synchronous pressure plate 700 and the pair of pistons 400 form an integral rigid connection body, which serves to restrict the rotation of the pistons 400.

[0061] It should be noted that the end face of the dual piston 400 needs to be leveled between the synchronous pressure plate 700 and the dual piston 400.

[0062] Please see Figure 2 In some embodiments, the synchronizing plate 700 is connected to the center of the end face of the piston 400. The connection point is set at the center of the end face of the piston 400, which can ensure that the piston 400 can always be correctly connected to the synchronizing plate 700 after rotational leveling, and the position of the synchronizing plate 700 remains unchanged.

[0063] Specifically Figure 2 In the illustrated embodiment, a screw hole is provided at the center of the end face of the piston 400, and a through hole (preferably countersunk) is also provided on the synchronizing plate 700. First, the synchronizing plate 700 and the pair of pistons 400 are glued together, and then the synchronizing plate 700 and pistons 400 are fixedly connected by screws 701 that engage with the through hole and screw hole. The screws 701 facilitate disassembly, assembly, and adjustment.

[0064] In some embodiments, the end face of the piston 400 and the opposite face of the synchronizing plate 700 have a socket structure for engagement, and the socket structure is coaxial with the piston 400 through the engagement of the socket structure. This facilitates the alignment of the synchronizing plate 700 and the piston 400 when installing the synchronizing plate 700.

[0065] It is understandable that the socket structure can be: a groove is provided at the center of the end face of the piston 400, and a boss that matches the groove is provided on the side of the synchronous pressure plate 700 opposite to the piston 400, and the groove and the boss are inserted into each other; or, a boss is provided at the center of the end face of the piston 400, and a groove that matches the boss is provided on the side of the synchronous pressure plate 700 opposite to the piston 400, and the boss and the groove are inserted into each other.

[0066] In some embodiments, the dual-piston electronic caliper further includes a drive mechanism 500. The drive mechanism 500 includes a motor 501, a first-stage worm gear 502, and two sets of second-stage worm gears 503. The motor 501 is driven by the first-stage worm gear 502, and the first-stage worm gear 502 is simultaneously driven by the two sets of second-stage worm gears 503. The second-stage worm gears 503 are driven by a transmission mechanism 800. The drive mechanism 500 using a single motor 501 has low control difficulty, simple mechanical component structure, small footprint, and low overall cost.

[0067] Furthermore, the two sets of second-stage worm gears 503 are symmetrically arranged in left and right helical configurations to eliminate the axial force they generate.

[0068] Please see Figure 5 In some embodiments, a rectangular annular groove is formed on the inner wall of the piston chamber, and a rectangular rubber ring 305 is disposed within the rectangular annular groove. The rectangular rubber ring 305 forms an interference fit with the outer wall of the piston 400 and the rectangular annular groove. The friction between the rectangular rubber ring 305 and the outer wall of the piston 400 and the rectangular annular groove can prevent the piston 400 from rotating during forward movement, especially when the piston 400 has no friction plate reaction force. Furthermore, it can also serve a fixing function after the flush synchronization of the two pistons 400 is adjusted, facilitating the installation of the synchronizing pressure plate 700.

[0069] It should be noted that the rectangular annular groove here does not necessarily have to be rectangular; it can be any shape, as long as it is used in conjunction with the rectangular rubber ring 305. The rectangular rubber ring 305 itself does not necessarily have to be rectangular; any shape is acceptable. The rectangular shape (rectangular annular groove and rectangular rubber ring 305) provides a relatively large contact surface and high friction, resulting in better prevention of piston 400 rotation. Therefore, a rectangular shape is chosen, but this should not be considered a limitation of this application.

[0070] In some embodiments, the dual-piston electronic caliper further includes a bridge plate 600, which is assembled with the caliper body 300 to form a complete modular caliper. The bridge plate 600 is configured to mount inner and outer friction plates. The bridge plate 600 and the caliper body 300 form a frame structure, facilitating disassembly and initial synchronization adjustment of the dual pistons 400. Specifically, the caliper body 300 can be made of aluminum alloy to reduce weight, while the bridge plate 600 can be made of casting to increase strength.

[0071] In a further embodiment, the bridge plate 600 has a pair of bridge arms 601, the ends of which are fixedly connected to the caliper body 300; the cross-section of the bridge arm 601 at half its height is coplanar with the plane formed by the axes of the pair of pistons 400. This design, where the cross-section of the bridge arm 601 at half its height is coplanar with the plane formed by the axes of the pair of pistons 400, ensures that the center of the caliper's braking force coincides with the connection center of the bridge arm 601, improving the stress distribution and preventing warping deformation of the bridge arm 601 during braking. This, in turn, prevents misalignment between the pistons 400 and the caliper body 300, improving the smoothness of the operation of the two pistons 400.

[0072] Furthermore, it is best if the plane formed by the axes of the pair of piston chambers is also coplanar.

[0073] Specifically Figure 1-3 In the embodiment shown, the end face of each bridge arm 601 is fixedly connected to the clamp body 300 by two bolts. The two bolts are located above and below the cross section of the bridge arm 601 at halfway point in the height direction, respectively. The bolt connection is convenient for disassembly.

[0074] Please see Figure 5 , Figure 6 In some embodiments, the dual-piston electronic caliper also includes a drive mechanism 800, which is configured to form a ball screw pair with the piston 400. The ball screw pair formed by the drive mechanism 800 and the piston 400 can convert the rotational driving force of the drive mechanism 500 into an axial driving force on the piston 400. The ball screw pair operates more smoothly and efficiently than existing screws and bushings, and has fewer components.

[0075] Specifically, the transmission mechanism 800 can be a single rod such as... Figure 6 The ball screw shown has raceways on its surface, and an outer raceway is also formed on the inner side of the piston 400. Balls are arranged between the raceways to form a ball screw pair. A first sealing ring 801 and a flat bearing 802 are also provided between the ball screw and the clamp body 300 for sealing and bearing axial rotational loads.

[0076] In a further embodiment, the dual-piston electronic caliper also includes a transmission mechanism 800 and a bridge plate 600. The transmission mechanism 800 is configured to form a ball screw pair with the piston 400. The bridge plate 600 and the caliper body 300 are combined and connected to form a complete modular caliper. The bridge plate 600 is configured to mount inner and outer friction plates. The bridge plate 600 has a pair of bridge arms 601, the ends of which are fixedly connected to the caliper body 300. The cross-section of the bridge arm 601 at half its height is coplanar with the plane formed by the axes of the pair of pistons 400. This design, where the cross-section of the bridge arm 601 at half its height is coplanar with the plane formed by the axes of the pair of pistons 400, ensures that the center of the caliper's braking force coincides with the connection center of the bridge arm 601, improving the stress distribution and preventing warping deformation of the bridge arm 601 during braking, thereby preventing misalignment between the piston 400 and the caliper body 300. Since there is no axial misalignment between the piston 400 and the clamp 300, a simpler ball screw pair structure can be used for transmission, eliminating the need for a threaded sleeve, simplifying the drive structure, and reducing weight. The forces on the ball screw pair and the piston 400 are coaxial, making the drive of the piston 400 by the ball screw smooth and efficient.

[0077] It should be noted that conventional electronic calipers use a screw and sleeve to drive the piston. The contact surface between the sleeve and the piston is a spherical or conical surface. This ensures that the sleeve can still function normally even when it is misaligned with the piston (axis), without affecting the braking force of the piston. The sleeve plays a role in centering and adjustment. Therefore, this embodiment simplifies the drive structure, allowing the ball screw to directly act on the piston 400 (without requiring an additional sleeve).

[0078] In a further embodiment, the two transmission mechanisms 800 and the two pistons 400 are symmetrically rotated left and right, which facilitates the balance and cancellation of the rotational forces of the two pistons in the synchronous pressure plate 700. Specifically, one piston 400 is configured to rotate right with its corresponding transmission mechanism 800, that is, the piston 400 moves forward when the transmission mechanism 800 rotates right; the other piston 400 is configured to rotate left with its corresponding transmission mechanism 800, that is, the piston 400 moves forward when the transmission mechanism 800 rotates left.

[0079] Specifically Figure 2 In the embodiment shown, the transmission mechanism 800 and the second-stage worm gear 503 can be coupled together via splines or the like.

[0080] Please see Figure 5 , Figure 6 , Figure 7 , Figure 8In some embodiments, the clamp body 300 has a second through hole 303 and a third through hole 304, wherein the third through hole 304 connects a pair of piston chambers, and the second through hole 303 connects one of the piston chambers to the outside; the transmission mechanism 800 has a fourth through hole 803, which connects the inside of the piston 400 to the piston chamber. A valve 900 is provided at the second through hole 303, which can balance the air pressure between the pair of piston chambers and the outside, and prevent the piston 400 from being obstructed due to excessive negative pressure in the piston chamber, thus affecting the braking performance.

[0081] It should be noted that valve 900 can be referenced to Chinese patent EPB brake caliper with publication number CN115539537A, but this should not be used as a limitation on this application.

[0082] Please continue reading Figure 6 In some embodiments, an annular groove 302 is formed at the root of the piston cavity inner wall, and the second through hole 303, the third through hole 304, and the fourth through hole 803 are all connected to the annular groove 302. By forming the annular groove 302 at the root of the piston cavity inner wall to connect the second through hole 303, the third through hole 304, and the fourth through hole 803, it is possible to prevent the second through hole 303, the third through hole 304, and the fourth through hole 803 from being blocked due to the piston 400 returning to its original position, thus ensuring that the second through hole 303, the third through hole 304, the fourth through hole 803, the piston cavity, and the inside of the piston 400 are always connected.

[0083] Please see Figure 9 The second aspect of this application provides a piston adjustment fixture 100 for synchronously adjusting a pair of pistons 400 of a dual-piston electronic caliper. The piston adjustment fixture 100 includes a fixture plate 101. An adjustment surface 102 is disposed on the first surface of the fixture plate 101. The adjustment surface 102 is a pre-machined plane for simultaneously contacting the end faces of the pair of pistons 400. A pair of first through holes 104 are provided on the fixture plate 101, both of which are located on the adjustment surface 102, and the pair of first through holes 104 are coaxially spaced with the pair of pistons 400. In use, the piston adjusting fixture 100 is fixedly connected to the clamp body 300, so that the adjusting surface 102 is aligned with the end faces of a pair of pistons 400; a rotary adjusting tool is then used to pass through the first through hole 104 and fix it to the end faces of the pistons 400 (this can be achieved through adhesive bonding or a connecting structure); then, the rotary adjusting tool is used to rotate each pair of pistons 400 until the end faces of both pistons 400 are in contact with the adjusting surface 102, thus completing the initial alignment and synchronization of the pistons 400. This fixture structure is simple, easy to use, and inexpensive.

[0084] In a further embodiment, the first surface of the tooling plate 101 is also provided with a boss, which is located on the side of the adjustment surface 102. Compared with the boss, the adjustment surface 102 is equivalent to a recessed area. Through the recessed design, it can accommodate situations where the piston 400 is longer than the piston chamber and its end face protrudes from the surface of the clamp body 300, thus making it more versatile.

[0085] In a further embodiment, the tooling plate 101 has bolt holes 103 at its boss, allowing the tooling plate 101 to be connected to the clamp body 300 using bolts. Utilizing the existing bolt connection structure between the clamp body 300 and the bridge plate 600 makes the connection convenient and simpler. Of course, other connection methods can also be used, such as clamping and fixing with a fixture.

[0086] Please see Figures 10 to 16 The third aspect of this application provides a piston adjustment method for synchronously adjusting a pair of pistons 400 of any of the above-mentioned dual-piston electronic calipers. The method includes: connecting the piston adjustment fixture 100 to the caliper body 300; starting the motor 501 until one piston 400 contacts the adjustment surface 102; using a rotary adjustment tool to drive the other piston 400 to rotate until it contacts the adjustment surface 102, completing the initial leveling and alignment of the pair of pistons 400; and then installing a synchronous pressure plate 700 to prevent the pistons 400 from rotating, ensuring that the pair of pistons 400 are always aligned and operate synchronously. The synchronous movement of the two pistons 400 drives the synchronous pressure plate 700 to push the friction plate for braking. The friction plate experiences uniform compressive stress from the synchronous pressure plate 700 to ensure stable and reliable braking.

[0087] It should be noted that the rotary adjustment tool can be any tool capable of driving the piston to rotate 400 degrees, such as a screwdriver, wrench, etc.

[0088] In a further embodiment, the rotary adjustment tool is a torque wrench 200, and the end face of the piston 400 should be provided with a connecting part 401 that matches the torque wrench 200. The connecting part 401 can be... Figures 12 to 16 Any structure (but not a limitation thereof) such as hexagonal, cross-shaped, triangular, or other protrusions or grooves. Specifically, the adjustment process involves using a torque wrench 200 to engage with the connecting part 401 through the first through hole 104, rotating and adjusting a pair of pistons 400 until the torque of the pair of pistons is the same or within a certain range. By using torque adjustment, errors from visual observation can be avoided, improving adjustment accuracy.

[0089] In a further embodiment, the motor 501 is repeatedly started to retract and extend a pair of pistons 400. The torque is adjusted once per cycle. This process is repeated multiple times until the torque of the pair of pistons is the same or within a certain range. By repeatedly adjusting the torque, the adjustment accuracy can be further improved.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no contradiction or conflict, the various technical features mentioned in the various embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A piston adjustment fixture for synchronously adjusting a pair of pistons in a dual-piston electronic caliper; The dual-piston electronic caliper includes: The clamp body has a pair of piston chambers; A pair of pistons, each disposed within a pair of piston chambers; Synchronous pressure plate, which is simultaneously connected to the end faces of a pair of pistons, for contacting the friction plate; A bridge plate, which is assembled and connected with the clamp body, wherein the bridge plate is configured to install inner and outer friction plates; The bridge plate has a pair of bridge arms, the ends of which are fixedly connected to the clamp body; the cross section of the bridge arm at half its height is coplanar with the plane formed by the axes of the pair of pistons. Its characteristic is that it further includes: The tooling plate has an adjustment surface on its first surface; a pair of first through holes are provided on the tooling plate, both of which are located on the adjustment surface, and the pair of first through holes are coaxially spaced with the pair of pistons respectively. The first surface of the tooling plate is also provided with a boss, which is located on the side of the adjustment surface; The tooling plate has bolt holes at the boss, and the tooling plate is configured to be connected to the clamp body using bolts.

2. The piston adjusting fixture according to claim 1, characterized in that, The synchronous pressure plate is connected to the center of the piston end face.

3. The piston adjusting fixture according to claim 1, characterized in that, The piston end face and the synchronous pressure plate are fitted with a socket structure, and the socket structure is coaxial with the piston.

4. The piston adjusting fixture according to claim 1, characterized in that, A rectangular annular groove is formed on the inner wall of the piston chamber, and a rectangular rubber ring is provided in the rectangular annular groove. The rectangular rubber ring forms an interference fit with the outer wall of the piston and the rectangular annular groove.

5. The piston adjusting fixture according to claim 1, characterized in that, The dual-piston electronic caliper also includes: A transmission mechanism is configured to form a ball screw pair with the piston.

6. The piston adjusting fixture according to claim 5, characterized in that, One of the pistons is configured to rotate clockwise with its corresponding transmission mechanism, and the other piston is configured to rotate counterclockwise with its corresponding transmission mechanism.

7. The piston adjusting fixture according to claim 5, characterized in that, The clamp body has a second through hole and a third through hole. The third through hole is configured to connect a pair of piston chambers and to connect the piston chambers with the outside. The second through hole is equipped with a valve. The transmission mechanism has a fourth through hole, which is configured to connect the inside of the piston with the piston chambers.

8. The piston adjusting fixture according to claim 7, characterized in that, The piston cavity inner wall has an annular groove at its root, and the second through hole, the third through hole and the fourth through hole are all connected to the annular groove.

9. The piston adjusting fixture according to claim 5, characterized in that, The dual-piston electronic caliper also includes: The drive mechanism includes a motor, a first-stage worm gear and two second-stage worm gears. The motor is driven by the first-stage worm gear, the first-stage worm gear is driven by the two second-stage worm gears, and the second-stage worm gears are driven by the transmission mechanism.

10. A piston adjustment method for synchronously adjusting a pair of pistons of a dual-piston electronic caliper using the piston adjustment fixture according to any one of claims 1-9, comprising: Connect the piston adjustment fixture to the clamp body; Activate the dual-piston electronic caliper until one of the pistons contacts the adjustment surface; Use a rotary adjustment tool to drive the other piston to rotate until it contacts the adjustment surface.

11. The piston adjustment method according to claim 10, characterized in that, The rotary adjustment tool is a torque wrench, and the end face of the piston is provided with a connecting part that matches the torque wrench; by cooperating with the torque wrench and the connecting part, a pair of pistons are rotated and adjusted until the torque of the pair of pistons is the same.

12. The piston adjustment method according to claim 11, characterized in that, Activate the dual-piston electronic caliper, retract and extend the pair of pistons, and repeatedly adjust the torque until the torque of the pair of pistons is the same.

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