Monolithic stationary caliper and sand mold

Abstract

The application relates to the field of brakes, and discloses a whole fixed caliper and a sand mold, which adopts a casted and integrally formed caliper body (200), the caliper body (200) is at least formed with a caliper opening (201) for extending a brake disc into the inside of the caliper body (200), the opening side of the caliper opening (201) is a caliper opening (201) side (114), and the side corresponding to the caliper opening (201) side (114) of the caliper opening (201) is a caliper back side (113); the caliper body (200) comprises an inner caliper body (204) at the inside of the caliper opening (201), an outer caliper body (200) at the outside of the caliper opening (201), and a connecting body connecting the inner caliper body (204) and the outer caliper body (200) at the two sides of the caliper opening (201). The brake has the advantages of convenient installation, reliable return of a return mechanism and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fixed calipers, and in particular to a fixed caliper and sand mold. BACKGROUND

[0002] Chinese patent CN201822061345.4 discloses a friction plate return spring. The friction plate return spring relatively increases the elastic deformation range of the elastic arm, and can reduce the "pre-load force" of the friction plate with the increase of the normal elastic reaction force and the wear of the friction plate. The present application adopts the structural design of the connected elastic arm, the extension arm and the connecting structure, so that the friction plate return spring can be elastically folded with a predetermined load, and the elastic deformation range of the elastic part can be changed automatically during the wear life of the friction plate, that is, the rattle and force change of the friction plate can be prevented. However, the return spring body of this structure has small installation space and many bending points, so it has high requirements for manufacturing precision. When the brake block is worn, the brake block moves towards the brake disc. Due to the small support point of the spring sheet structure of the traditional structure, the spring force is prone to decline in durability, resulting in slow return speed of the brake caliper in the later period, abnormal noise when the brake is released, and other problems.

[0003] Chinese patent CN201980027491.X discloses a fixed caliper body for a disc brake disc, which is in separable parts but ensures the accurate alignment of the bridge and the elongated element, which ensures perfect orthogonality between the parts, which does not cause problems to the pad, such as jamming and uneven wear of the pad. By improving the accuracy of the connection of the connecting element or bridge with the half body, the parallelogram created by the half body and the bridge is hardened. However, this kind of caliper body structure has the disadvantages of many parts, high manufacturing and assembly precision requirements. SUMMARY

[0004] In order to solve the above technical problems, the present application solves the above technical problems by the following technical scheme:

[0005] A fixed caliper, comprising a caliper body formed by casting, the caliper body is formed with a caliper opening for inserting a brake disc into the inside of the caliper body, the opening side of the caliper opening is a caliper opening side, and the side of the caliper opening corresponding to the caliper opening side is a caliper back side; the caliper body comprises an inner caliper body on the inside of the caliper opening, an outer caliper body on the outside of the caliper opening, and a connecting body connecting the inner caliper body and the outer caliper body on both sides of the caliper opening;

[0006] The inner caliper body and the outer caliper body are provided with a piston cavity, and the inner caliper body and the outer caliper body are formed with an oil passage cavity communicating with the piston cavity; the oil passage cavities of the inner caliper body and the outer caliper body are communicated through a connecting cavity formed in the connecting body, and the connecting cavity extends to the oil passage cavities of the inner caliper body and the outer caliper body through a hole formed in the caliper body, so that the oil passage cavities of the inner caliper body and the outer caliper body are communicated;

[0007] The connecting arm is integrally formed with an arched shape on the back side of the pliers, and further comprises a return spring with elastic recovery capability, which is positioned and installed through the connecting arm and a support rod for guiding the brake block, and the return spring supports the brake block.

[0008] As a preferred embodiment, the connecting arm is in a "C" shape structure as a whole, and the two ends of the connecting arm are connected to the inner pliers body and the outer pliers body respectively; the middle part of the connecting arm is formed with a weight-reducing port, and the return spring is positioned and installed in the weight-reducing port; the return spring comprises a spring support main body and a return part for abutting against the brake block, and the return part and the support main body are integrally formed in a spring bending structure with elastic return capability; the return part comprises an abutting part matched with the support rod and the brake block, and a bending part connecting the abutting part and the support main body; the abutting part comprises a cladding part capable of being cladded on the support rod, one end of the cladding part in the axial direction abuts against the brake block, the cladding part has an arc-shaped port, the cladding part can abut against the support rod through the arc-shaped port, and the cladding part can be elastically deformed under the action of the brake block.

[0009] As a preferred embodiment, the piston cavity and the oil passage cavity in the inner pliers body and the outer pliers body are mirror-symmetrically arranged, the end-to-end line of the mirror-symmetrically arranged oil passage cavities is a connecting axis, the connecting axis is parallel to the axis of the brake disc, and the axis of the connecting cavity is collinear with the connecting axis; the oil passage cavity is in a strip shape as a whole, and the cross-sectional size of the oil passage cavity gradually decreases from the connecting end to the connecting body; the side wall of the weight-reducing port is provided with a clamping groove, the support main body is provided with a mounting sheet, the direction of the mounting sheet is opposite to the direction of the arc-shaped port, and the mounting sheet is arranged perpendicularly to the support main body; the mounting sheet is clamped in the clamping groove; in the initial state, the surface of the support main body and the inner side of the connecting arm abut against each other under the action of the return part.

[0010] As a preferred embodiment, the arc-shaped port of the cladding part faces the pliers mouth side, the middle part of the support main body is provided with a radially extending weight-reducing groove, at least one end of the weight-reducing groove is formed with a mounting sheet through flanging, and the number of the mounting sheets is matched with the number of the clamping grooves.

[0011] As a preferred embodiment, the bending part comprises a first bending sheet connected to the support main body, a second bending sheet in the middle part, and a third bending sheet connected to the return part; the first bending sheet extends towards the pliers mouth side, the second bending sheet is arranged in parallel to the support main body, and the third bending sheet extends towards the pliers back side.

[0012] As a preferred embodiment, the included angle between the first bending sheet and the support main body is obtuse, and the included angle between the second bending sheet and the third bending sheet is obtuse.

[0013] As a preferred embodiment, the other end of the cladding part in the axial direction is an end face with an inclined surface, the inclined port of the inclined surface faces the direction of the surface where the brake block abuts against the cladding part, and the inclined surface and the edge side surface of the bending part are circularly arc-shaped.

[0014] Preferably, the third bending piece and the covering part are circularly arc transition, the covering part comprises an inner section connected with the third bending piece, and further comprises an outer section not connected with the third bending piece and extending from the inner section to the direction of the brake block; the edge part of the inner caliper body extends a fixing support, the fixing support comprises a plurality of connecting ears, and a reinforcing rib is formed between the connecting ear and the outer wall of the piston cavity of the inner caliper body.

[0015] A sand mold for manufacturing the caliper body of the integral fixed caliper, comprising a columnar piston type for forming a brake piston cavity, and further comprising an oil passage type for forming an oil passage in the caliper body, the oil passage type being in an integral structure with the piston type, and the oil passage type being located at the outer end side of the piston type; the number of the piston types is multiple, the piston types are coaxially arranged, and the piston types are connected through a connecting column, the connecting column being connected between the outer ends of the piston types; a connecting point one is formed at the connection between the oil passage type and the piston type, a connecting point two is formed at the connection between the connecting column and the piston type, and the connecting point one and the connecting point two are at the same height.

[0016] Preferably, the piston type comprises a column part and a boss arranged at the end part, the connecting column and the oil passage type are connected on the boss; the piston types are composed of a piston group, the oil passage type is connected on the outermost piston type of the piston group, the left side and the right side of the piston group are provided with the oil passage type, the oil passage types on the left side and the right side of the piston group are arranged in an "eight" shape, the upper end and the lower end of the piston group are provided with the oil passage type, the oil passage type at the upper end of the piston group and the oil passage type at the lower end of the piston group are mirror image arranged, the number of the oil passage types is four, a curved transition part is arranged at the connection between the oil passage type and the piston type, the piston type is a cylindrical part or a whole cylindrical part with a stepped type, the sand mold is formed of molding sand or resin or a combination of molding sand and resin, and the oil passage type is a strip structure, the cross-sectional width of the strip structure gradually decreases from the connecting end to the outer end.

[0017] Through the above technical scheme, the present application has the following technical effects:

[0018] The caliper designed in the present application is an integral caliper, and the whole caliper body is free of exposed pipelines, so that the pipeline aging and pipeline damage phenomenon does not occur, and the present application has the advantages of long service life and convenient installation. Meanwhile, the return spring body designed in the present application has good integrity and low cost, does not need to be installed by using installation components, and is more convenient and simple to install. Moreover, the return spring body is twisted and deformed in cooperation with bending deformation, so that the return spring body can accept a larger deformation force, has a longer service life, and can ensure that the brake block can provide stable rebound force in the service life cycle. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 FIG. 1 is a schematic view of the overall structure of the brake.

[0020] Figure 2 FIG. 5 is a sectional view of the caliper body.

[0021] Figure 3 is a sectional view of the caliper body.

[0022] Figure 4 is a structural schematic view of the return spring body.

[0023] Figure 5 is a partial enlarged view of Figure 4 .

[0024] Figure 6 is a structural schematic view of the sand mold.

[0025] Figure 7 is a left view of Figure 6 .

[0026] Figure 8 is a front view of Figure 6 .

[0027] The reference signs in the drawings are as follows:

[0028] 100 - support body, 101 - return portion, 102 - support rod, 103 - brake block, 104 - abutting portion, 105 - bent portion, 106 - covering portion, 107 - arc-shaped opening, 108 - weight-reducing groove, 109 - mounting piece, 110 - first bent piece, 111 - second bent piece, 112 - third bent piece, 113 - back side of caliper, 114 - jaw side, 115 - inner section, 116 - outer section, 1 - piston type, 2 - oil passage type, 3 - connecting column, 4 - connecting point one, 5 - connecting point two, 6 - boss, 7 - piston group, 200 - caliper body, 201 - jaw, 202 - piston cavity, 203 - oil passage cavity, 204 - inner caliper body, 205 - outer caliper body, 206 - weight-reducing opening, 207 - connecting axis, 208 - clamping groove, 209 - connecting lug, 210 - reinforcing rib. DETAILED DESCRIPTION

[0029] The application will be further described in detail below in combination with the drawings and examples.

[0030] Example 1

[0031] A monolithic fixed caliper includes a caliper body 200 formed by casting in one piece, the caliper body 200 being formed with at least a jaw 201 for extending a brake disc into the inside of the caliper body 200, an opening side of the jaw 201 being a jaw side 114 of the jaw 201, and a side of the jaw 201 corresponding to the jaw side 114 being a back side 113 of the caliper; the caliper body 200 including an inner caliper body 204 inside the jaw 201, an outer caliper body 200 outside the jaw 201, and a connecting body connecting the inner caliper body 204 and the outer caliper body 200 at both sides of the jaw 201.

[0032] The inner plier body 204 and the outer plier body 200 are provided with a piston cavity 202, and the inner plier body 204 and the outer plier body 200 are internally formed with an oil passage cavity 203 communicated with the piston cavity 202, and the oil passage cavities 203 of the inner plier body 204 and the outer plier body 200 are communicated through a connecting cavity formed on the connecting body and extending to the oil passage cavities 203 of the inner plier body 204 and the outer plier body 200 through a hole formed on the plier body 200, so that the oil passage cavities 203 of the inner plier body 204 and the outer plier body 200 are communicated;

[0033] The plier back side 113 is integrally formed with an arched connecting arm, and further comprises a return spring sheet having elastic recovery capability, the return spring sheet is positioned and installed through the connecting arm and a support rod 102 for guiding the brake block 103, and the return spring sheet supports the brake block 103. The connecting arm in the embodiment plays a role of a reinforcing arm, and the connecting arm is arched towards the plier back side 113. The outer side of the connecting arm is provided with a protruding rib, and the rib is designed along the trajectory of the connecting arm.

[0034] The connecting arm in the embodiment is in a "C" shape structure, and the two ends of the connecting arm are connected to the inner plier body 204 and the outer plier body 200 respectively; the middle part of the connecting arm is formed with a weight-reducing port 206, and the return spring sheet is positioned and installed in the weight-reducing port 206; the weight-reducing port 206 in the embodiment is located between the two ribs, and the shape of the weight-reducing port 206 is a key groove shape and is arranged in the axial direction. The return spring sheet comprises a spring sheet support body 100 and a return part 101 for abutting against the brake block 103, and the return part 101 and the support body 100 are an integral structure formed by spring bending with elastic return capability; the return part 101 comprises an abutting part 104 matched with the support rod 102 and the brake block 103, and a bending part 105 connecting the abutting part 104 and the support body 100; the abutting part 104 comprises a cladding part 106 capable of being cladded on the support rod 102, one end of the cladding part 106 is abutted on the brake block 103 in the axial direction, the cladding part 106 has an arc-shaped port 107, the cladding part 106 can be abutted on the support rod 102 through the arc-shaped port 107, and the cladding part 106 can be elastically deformed under the action of the brake block 103.

[0035] In the embodiment, as to the internal chamber, the piston cavities 202 and the oil passage cavities 203 in the inner plier body 204 and the outer plier body 200 are mirror-symmetrically arranged, so that the acting forces of the inner brake piston and the outer brake piston can be as same as possible, although there is actually a difference.

[0036] Meanwhile, in order to facilitate the description, the end connecting line of the mirror-symmetrical oil passage cavity 203 is defined as the connecting axis 207, and the mirror-symmetrical oil passage cavity 203 described refers to the symmetrical part of the oil passage cavity 203 of the inner caliper body 204 and the oil passage cavity 203 of the outer caliper body 200. The connecting axis 207 is parallel to the axis of the brake disc, and this design can make the axis of the connecting cavity and the connecting axis 207 be collinear when the caliper body 200 is in the positioning state. The oil passage cavity 203 is in the shape of a strip as a whole, and the size of the cross section of the oil passage cavity 203 gradually decreases from the connecting end to the connecting body. The side wall of the weight-reducing port 206 is provided with a clamping groove 208, the supporting body 100 is provided with a mounting sheet 109, the direction of the mounting sheet 109 is opposite to the direction of the arc-shaped port 107, and the mounting sheet 109 is arranged perpendicularly to the supporting body 100. The mounting sheet 109 is clamped in the clamping groove 208. In the initial state, the surface of the supporting body 100 and the inner side of the connecting arm are in contact under the action of the return portion 101.

[0037] The edge of the inner caliper body 204 extends a fixing support, and the fixing support includes a plurality of connecting ears 209. The connecting ears 209 and the outer wall of the piston cavity 202 of the inner caliper body 204 form a reinforcing rib 210 therebetween.

[0038] The spring structure is as follows: the spring support body 100 and the return portion 101 for abutting against the brake block 103, the return portion 101 and the spring support body 100 are an integral structure formed by bending of the spring with elastic return capability; the return portion 101 includes an abutting portion 104 matched with the supporting rod 102 and the brake block 103, and a bending portion 105 connecting the abutting portion 104 and the spring support body 100; the abutting portion 104 includes a cladding portion 106 capable of being cladded on the supporting rod 102, one end of the cladding portion 106 in the axial direction abuts against the brake block 103, the cladding portion 106 has an arc-shaped port 107, the cladding portion 106 can abut against the supporting rod 102 through the arc-shaped port 107, and the cladding portion 106 can be elastically deformed under the action of external force. In the present scheme, the spring support body 100 extends in the radial direction of the brake block 103 during installation, wherein the spring support body 100 is located between the inner brake block 103 and the outer brake block 103, and the spring support body 100, the inner brake block 103 and the outer brake block 103 are arranged substantially perpendicularly. The cladding portion 106 is in the shape of a semicircle as a whole, and the semicircle in the present embodiment does not require a degree, but only needs to be capable of achieving matching support with the supporting rod 102.

[0039] The cladding portion 106 serves the purpose of cladding and supporting on one hand, and on the other hand, due to the fact that it is a spring material, it can be elastically deformed under force. In the present scheme, the cladding portion 106 and the bending portion 105 both provide the function of accumulating and releasing elastic potential energy of the spring.

[0040] In order to realize the stable support of the inner brake block 103 and the outer brake block 103, the number of the return parts 101 is four, which are arranged at the four corners of the support body 100, and the four return parts 101 are arranged in an "X" shape. That is, two return parts 101 are arranged on the inner brake block 103 and the outer brake block 103, respectively, and act on the two ends of the jaw back side 113 of the brake block 103 in the radial direction.

[0041] In the embodiment, the arc-shaped opening 107 of the cladding part 106 faces the jaw opening 201 side 114. The middle part of the support body 100 is provided with a radially extending weight-reducing groove 108, and at least one end of the weight-reducing groove 108 is formed into a mounting sheet 109 by flanging. The mounting sheet 109 is arranged vertically to the support body 100, and the direction of the mounting sheet 109 is opposite to the direction of the arc-shaped opening 107. The mounting sheet 109 cooperates with the jaw body 200 to realize the function of mounting the spring sheet, and the combination structure of the mounting sheet 109 and the cladding part 106 can realize the positioning of the spring sheet in the axial direction, the radial direction and the inner-outer direction.

[0042] In the embodiment, the bending part 105 includes a first bending sheet 110 connected with the support body 100, a second bending sheet 111 in the middle part, and a third bending sheet 112 connected with the return part 101. The structure of the bending part 105 composed of the first bending sheet 110, the second bending sheet 111 and the third bending sheet 112 is approximately S-shaped.

[0043] In the embodiment, the first bending sheet 110 extends towards the jaw opening 201 side 114, the second bending sheet 111 is arranged parallel to the support body 100, and the third bending sheet 112 extends towards the jaw back side 113. The included angle between the first bending sheet 110 and the support body 100 is obtuse, and the included angle between the second bending sheet 111 and the third bending sheet 112 is obtuse.

[0044] In the embodiment, the other end of the cladding part 106 in the axial direction is a beveled end face, and the beveled opening of the beveled end face faces the direction of the surface of the brake block 103 contacted by the cladding part 106. The beveled end face and the side surface of the bending part 105 are circularly arc-shaped. The third bending sheet 112 and the cladding part 106 are circularly arc-shaped. The cladding part 106 includes an inner section 115 connected with the third bending sheet 112, and an outer section 116 extending towards the brake block 103 and not connected with the third bending sheet 112. The outer section 116 can be deformed under external force, but will not be separated from the contact with the brake block 103. The support spring sheet designed in the scheme is integrally formed by bending, and the designed contact structure is large and stable, and can be matched with the support rod 102. Therefore, the brake block 103 will not shake and make noise during axial movement. Moreover, the U-shaped structure can provide reliable elastic force during the whole deformation process, and has long service life.

[0045] The working process is as follows:

[0046] The mounting piece 109 is fixed on the back side 113 of the pliers, and the four arc-shaped openings 107 of the reset part 101 are in contact with the two ends of the support rod 102, and the contact part 104 is in contact with the brake block 103, and a small predetermined force is applied to avoid the shaking of the brake block 103.

[0047] When braking, the brake block 103 is pushed to the brake disc under the action of the piston, and the brake block 103 simultaneously applies a force to the end of the reset part 101. Under the action of the external force, the contact part receives a force away from the support rod 102, and the reset part 101 deforms to a certain extent, and the deformation trend is towards the back side 113 of the pliers, so that the axial direction of the reset part 101 is skewed, and the reset part 101 accumulates elastic potential energy. When the brake is released, the reset part 101 returns to the initial shape and releases the elastic potential energy. The brake block 103 resets.

[0048] After using one end for a period of time, as the friction block and the brake disc wear during the use of the product, the piston will extend a part to reduce the brake gap caused by the wear of the friction block, and the initial state of the reset end will be further compressed, and the spring force will increase to compensate for the attenuation of the spring force during the durability use. At the same time, the bending part 105 can compensate for the subsequent brake return force. Therefore, the service life is longer.

[0049] Embodiment 2

[0050] The difference between this embodiment and embodiment 1 is that the number of mounting pieces 109 is 2, which are respectively located at the two ends of the weight-reducing opening 206.

[0051] Embodiment 3

[0052] The difference between this embodiment and embodiment 1 is that the mounting piece 109 is an L-shaped structure.

[0053] Embodiment 4

[0054] The sand mold disclosed in this embodiment is used to manufacture the piston cavity 202 and the oil passage cavity 203 inside the pliers body 200 in the embodiments. It includes a cylindrical piston type 1 for forming the brake piston cavity 202, and an oil passage type 2 for forming the oil passage in the pliers body 200. The oil passage type 2 is an integral structure with the piston type 1, and the oil passage type 2 is located on the outer end side of the piston type 1. The oil passage type 2 and the piston type 1 in this embodiment are integrally formed by using sand.

[0055] In this embodiment, the number of piston types 1 is multiple, and the number of piston types 1 in this embodiment is 2. The piston types 1 are coaxially arranged, and the piston types 1 are connected by a connecting column 3. The connecting column 3 is connected between the outer ends of the piston types 1. The connecting column 3 in this embodiment serves the purpose of connecting the two piston cavities 202 later.

[0056] In this embodiment, the connection between the oil passage type 2 and the piston type 1 is connection point one 4, the connection between the connecting column 3 and the piston type 1 is connection point two 5, and the connection point one 4 and the connection point two 5 are at the same height. This kind of structure design can ensure that the end of the oil passage type 2, the piston type 1 and the connecting column 3 are at approximately the same height, thereby ensuring smooth flow of hydraulic oil and flatness inside the chamber.

[0057] In this embodiment, the piston type 1 includes a columnar portion and a boss 6 provided at the end, and the connecting column 3 and the oil passage type 2 are connected to the boss 6. In this embodiment, the boss 6 is a circular truncated cone structure.

[0058] In this embodiment, the piston types 1 form a piston group 7, the oil passage type 2 is connected to the outermost piston type 1 of the piston group 7, and the oil passage type 2 is provided on the left and right sides of the piston group 7. The oil passage type 2 is used to connect the upper piston chamber 202 and the lower piston chamber 202, so the oil passage type 2 is designed on the edge of the outermost piston. The oil passage types 2 on both sides of the axis of the piston group 7 are arranged in the shape of an "eight".

[0059] In this embodiment, the oil passage type 2 is provided on the upper end and the lower end of the piston group 7, the oil passage type 2 on the upper end of the piston group 7 and the oil passage type 2 on the lower end of the piston group 7 are mirror image arrangements, and the number of the oil passage types 2 is four.

[0060] In this embodiment, a curved transition part is provided at the connection between the oil passage type 2 and the piston type 1. The curved transition part is beneficial to the flow of the oil passage.

[0061] In this embodiment, the piston type 1 is a cylindrical component or a component with a stepped shape that is overall cylindrical.

[0062] In this embodiment, the sand type is formed of a combination of molding sand and resin. This kind of material has the advantages of high temperature resistance and material reusability.

[0063] In this embodiment, the oil passage type 2 has a strip-shaped structure, and the cross-sectional width of the strip-shaped structure gradually decreases from the connecting end to the outer end.

[0064] The sand type designed in this scheme can integrally form the piston chamber 202 and the oil passage required by the caliper, has the advantages of simple molding and convenient casting. Moreover, the sand type structure has the advantages of easy demolding and reusable sand type material. At the same time, the sand type can be used for positioning during casting of the caliper.

Claims

1. A one-piece fixed caliper characterized by: The caliper body (200) is integrally formed by casting, and the caliper body (200) is provided with at least a caliper opening (201) for extending the brake disc into the caliper body (200), the opening side of the caliper opening (201) is a caliper side (114), and the side of the caliper opening (201) corresponding to the caliper side (114) is a caliper back side (113); the caliper body (200) comprises an inner caliper body (204) inside the caliper opening (201), an outer caliper body (205) outside the caliper opening (201), and a connecting body connecting the inner caliper body (204) and the outer caliper body (205) on both sides of the caliper opening (201); The inner caliper body (204) and the outer caliper body (205) are provided with a piston cavity (202), and the inner caliper body (204) and the outer caliper body (205) are internally provided with an oil passage cavity (203) in communication with the piston cavity (202), the oil passage cavities (203) of the inner caliper body (204) and the outer caliper body (205) are communicated through a connecting cavity formed in the connecting body, and the connecting cavity extends to the oil passage cavities (203) of the inner caliper body (204) and the outer caliper body (205) through a hole formed in the caliper body (200), so that the oil passage cavities (203) of the inner caliper body (204) and the outer caliper body (205) are communicated; The caliper back side (113) is integrally formed with an arched connecting arm, and further comprises a return spring sheet having elastic recovery capability, the return spring sheet is positioned and installed through the connecting arm and a supporting rod (102) for guiding a brake block (103), and the return spring sheet assists in supporting the brake block (103); The connecting arm is in a whole "C" shape structure, and the two ends of the connecting arm are connected to the inner caliper body (204) and the outer caliper body (205) respectively; the middle part of the connecting arm is formed with a lightening hole (206), and the return spring sheet is positioned and installed in the lightening hole (206); the return spring sheet comprises a supporting main body (100) and a return part (101) for abutting against the brake block (103), and the return part (101) and the supporting main body (100) are integrally formed in a spring sheet bending structure having elastic return capability; the return part (101) comprises an abutting part (104) matched with the supporting rod (102) and the brake block (103), and a bending part (105) connecting the abutting part (104) and the supporting main body (100); the abutting part (104) comprises a cladding part (106) capable of being cladded on the supporting rod (102), one end of the cladding part (106) is abutted on the brake block (103), the cladding part (106) is provided with an arc-shaped hole (107), the cladding part (106) is capable of being abutted on the supporting rod (102) through the arc-shaped hole (107), and the cladding part (106) is capable of being elastically deformed under the action of the brake block (103); The bending part (105) comprises a first bending piece (110) connected with the support body (100), a second bending piece (111) in the middle part, and a third bending piece (112) connected with the return part (101); the first bending piece (110) extends towards the jaw side (114), the second bending piece (111) is arranged in parallel with the support body (100), and the third bending piece (112) extends towards the back side (113).

2. A one-piece fixed caliper according to claim 1, characterized in that: The piston cavity (202) and the oil passage cavity (203) in the inner caliper body (204) and the outer caliper body (205) are arranged in mirror symmetry, the end-to-end line of the mirror-symmetrical oil passage cavity (203) is a connecting axis (207), the connecting axis (207) is parallel to the axis of the brake disc, the axis of the connecting cavity is collinear with the connecting axis (207); the oil passage cavity (203) is in the shape of a strip as a whole, the cross-sectional size of the oil passage cavity (203) gradually decreases from the connecting end to the connecting body; the side wall of the weight-reducing port (206) is provided with a clamping groove (208), the support body (100) is provided with a mounting piece (109), the direction of the mounting piece (109) is opposite to the direction of the arc-shaped port (107), and the mounting piece (109) is arranged perpendicularly to the support body (100); the mounting piece (109) is clamped in the clamping groove (208); in the initial state, the surface of the support body (100) and the inner side of the connecting arm are abutted under the action of the return part (101).

3. A one-piece fixed caliper according to claim 2, characterized in that: The arc-shaped port (107) of the cladding part (106) faces the jaw side (114), the middle part of the support body (100) is provided with a radially extending weight-reducing groove (108), at least one end of the weight-reducing groove (108) is formed into a mounting piece (109) through flanging, and the number of the mounting pieces (109) is matched with the number of the clamping grooves (208).

4. The one-piece fixed caliper according to claim 1, wherein: The included angle between the first bending piece (110) and the support body (100) is obtuse, and the included angle between the second bending piece (111) and the third bending piece (112) is obtuse.

5. The one-piece fixed caliper according to claim 1, wherein: The end face of the other end of the cladding part (106) in the axial direction is a bevel, the bevel of the bevel port faces the direction of the surface where the brake block (103) abuts against the cladding part (106), and the bevel and the side surface of the bending part (105) are circularly arc-shaped.

6. The one-piece fixed caliper according to claim 1, wherein: The third bending piece (112) and the cladding part (106) are circularly arc-shaped, the cladding part (106) comprises an inner segment (115) connected with the third bending piece (112), and further comprises an outer segment (116) not connected with the third bending piece (112) and extending from the inner segment (115) to the brake block (103); the edge part of the inner caliper body (204) extends a fixed support, the fixed support comprises a plurality of connecting ears (209), and the connecting ears (209) and the outer wall of the piston cavity (202) of the inner caliper body (204) form a reinforcing rib (210) therebetween.

7. A sand mould characterised in that: The caliper body (200) for manufacturing the fixed caliper of any one of claims 1 to 6 comprises a plurality of piston types (1) for forming piston cavities (202), and an oil passage type (2) for forming oil passages in the caliper body (200), the oil passage type (2) is integrated with the piston types (1) and is located at the outer end side of the piston types (1); the piston types (1) are coaxially arranged and connected by connecting columns (3) between the outer ends of the piston types (1); the connecting point one (4) is located at the connection between the oil passage type (2) and the piston types (1), the connecting point two (5) is located at the connection between the connecting column (3) and the piston types (1), and the connecting point one (4) and the connecting point two (5) are at the same height.

8. A sand mould according to claim 7, characterised in that: The piston type (1) comprises a columnar portion and a boss (6) arranged at the end, the connecting column (3) and the oil passage type (2) are connected to the boss (6); the piston types (1) form a piston group (7), the oil passage type (2) is connected to the outermost piston type (1) of the piston group (7), the left and right sides of the piston group (7) are provided with the oil passage type (2), the oil passage types (2) on the left and right sides of the piston group (7) are arranged in the shape of an "eight", the upper end and the lower end of the piston group (7) are provided with the oil passage type (2), the oil passage type (2) at the upper end of the piston group (7) and the oil passage type (2) at the lower end of the piston group (7) are mirror image arranged, the number of the oil passage types (2) is four; the connection between the oil passage type (2) and the piston type (1) is provided with a curved transition part; the piston type (1) is a cylindrical part or a whole cylindrical part in the form of a stepped type; the sand type is formed by sand or resin or a combination of sand and resin; the oil passage type (2) is a strip structure, the cross-sectional width of the strip structure gradually decreases from the connecting end to the outer end.

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