A turning fixture for the main cylinder hole of a caliper of a hydraulic disc brake of an automobile

Abstract

A kind of automobile hydraulic caliper disc brake caliper main cylinder hole turning fixture, including lathe spindle (1), be set in the main shaft hydraulic cylinder (2) of lathe spindle (1) and caliper clamp, the end of lathe spindle (1) is provided with transition disc, caliper clamp is installed on transition disc, caliper clamp includes component mounting seat (3), caliper top tube (4), main eccentric top plate (5) and vice eccentric top plate (6), component mounting seat (3) is installed on transition disc, caliper top tube (4) is installed in the piston rod end of main shaft hydraulic cylinder (2), caliper top tube (4) is located in component mounting seat (3);Advantages are: by main eccentric top plate and vice eccentric top plate, the rotation center of brake caliper is fine-tuned, so that the rotation center of brake caliper is consistent with the rotation center of machine tool spindle, machining precision is high, product quality is good.

Description

Technical Field

[0001] This invention relates to the field of brake caliper machining equipment, specifically to a turning fixture for the master cylinder bore of an automotive hydraulic disc brake caliper. Background Technology

[0002] Currently, when machining the master cylinder bore of a brake caliper, the brake caliper needs to be fixed on a machine tool first, and then the machine tool is used to machine the master cylinder bore. However, when using the existing machine tool fixture to fix the brake caliper, the rotation center of the brake caliper is prone to misalignment with the rotation center of the machine tool spindle, affecting machining accuracy.

[0003] A search revealed a Chinese patent with authorization announcement number CN207027068U, which discloses a brake caliper machining fixture. The clamping device includes a replaceable quick-change plate and left and right clamping plates for restricting the vertical movement of the caliper body. The quick-change plate is located between the left and right clamping plates and has a first positioning pin for planar support of the caliper body, a second positioning pin for restricting the forward, backward, left, and right movement of the caliper body, and a third positioning pin for restricting the rotation of the caliper body. The left and right clamping plates are connected to a power mechanism. The brake caliper machining fixture in the aforementioned patent has the following shortcomings: the rotation center of the brake caliper cannot be finely adjusted, resulting in low machining accuracy.

[0004] A search revealed a Chinese patent with authorization announcement number CN109715970B, which discloses a method for machining the interior of a disc brake caliper. In this method, a cutting tool is guided into a cavity through a first opening different from the mounting opening. A tool holder enters the caliper interior through a second opening different from the first opening used for the tool, and the tool, guided through the first opening, is then transferred to the tool holder. However, this patent also lacks a fine-tuning function for the caliper's rotation center, resulting in low machining accuracy. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned shortcomings by providing a machining fixture for the master cylinder bore of an automotive hydraulic disc brake caliper.

[0006] The present invention includes a lathe spindle, a spindle hydraulic cylinder disposed within the lathe spindle, and a caliper clamp. A transition plate is disposed at the end of the lathe spindle, and the caliper clamp is mounted on the transition plate.

[0007] The caliper clamp includes a component mounting base, a caliper top tube, a main eccentric top plate, and a secondary eccentric top plate.

[0008] The component mounting base is installed on the transition plate, the caliper top tube is installed at the piston rod end of the spindle hydraulic cylinder, the caliper top tube is located inside the component mounting base, the main eccentric top plate is detachably installed on the component mounting base, and the secondary eccentric top plate is detachably installed in the middle of the main eccentric top plate. The spindle hydraulic cylinder drives the caliper top tube to press the brake caliper master cylinder against the secondary eccentric top plate. The main eccentric top plate and the secondary eccentric top plate are used to adjust the machining deviation of the center axis of the brake caliper master cylinder.

[0009] The caliper top tube has a threaded hole at the bottom and a V-shaped cylinder clearance groove at the top. The caliper top tube is threadedly installed at the end of the piston rod of the spindle hydraulic cylinder.

[0010] The component mounting base includes a spindle disc, a pair of outer side plates, and an outer mounting plate. A jack tube has a through hole at the center of the spindle disc, and the caliper jack tube is located inside the through hole. The spindle disc is bolted to the transition plate. The pair of outer side plates are symmetrically distributed and bolted to the spindle disc. The outer mounting plate has a top plate mounting groove in the middle, and a caliper placement hole in the middle of the top plate mounting groove. A set of threaded holes are evenly distributed in a ring on the top plate mounting groove. The main eccentric top plate is bolted to the top plate mounting groove, and the outer mounting plate is bolted to the pair of outer side plates.

[0011] The outer edge of the main eccentric top plate has a set of A semi-circular toothed grooves evenly distributed around it. The bottom of the main eccentric top plate has a secondary top plate mounting groove. The middle of the main eccentric top plate has a caliper mounting hole. On both sides of the caliper mounting hole, the main eccentric top plate has a set of secondary top plate fixing threaded holes arranged in a ring. A set of bolts passes through the corresponding A semi-circular toothed grooves on the main eccentric top plate and is screwed into the threaded holes of the top plate mounting groove to fix the main eccentric top plate in the top plate mounting groove.

[0012] A set of semi-circular B-shaped toothed grooves are evenly distributed around the outer edge of the secondary eccentric top plate. A set of bolts passes through the corresponding semi-circular B-shaped toothed grooves on the secondary eccentric top plate and is screwed into the secondary top plate fixing threaded hole of the main eccentric top plate to fix the secondary eccentric top plate in the secondary top plate mounting groove. A main cylinder machining reference hole is opened in the middle of the secondary eccentric top plate. An annular support protrusion is provided on the main cylinder machining reference hole. An arc-shaped caliper placement groove is opened on the secondary eccentric top plate. The top of the arc-shaped caliper placement groove is connected to the main cylinder machining reference hole. A pair of caliper inner wall limiting arc surfaces are formed on the arc-shaped caliper placement grooves on both sides of the main cylinder machining reference hole. A pair of caliper pins are provided on the secondary eccentric top plates located on both sides of the main cylinder machining reference hole. The pair of caliper pins are respectively inserted into the guide pin holes corresponding to the brake calipers.

[0013] The secondary eccentric top plate has a pair of threaded holes. The pair of caliper pins are a rhomboid locating pin and a cylindrical locating pin. The outer wall of one end of the rhomboid locating pin and the cylindrical locating pin are respectively provided with external threads. The rhomboid locating pin and the cylindrical locating pin are respectively threaded into the corresponding threaded holes of the secondary eccentric top plate and are respectively locked by nuts.

[0014] The main eccentric top plate is a circular top plate. The outer disk has a semi-circular toothed groove A on the main eccentric top plate, and the inner disk has a caliper mounting hole on the main eccentric top plate. The eccentric distance between the vertical center line of the outer disk of the main eccentric top plate and the vertical center line of the inner disk of the main eccentric top plate is K, where K is 2-5mm.

[0015] The secondary eccentric top plate is a circular top plate. The eccentric distance between the horizontal center line of the secondary eccentric top plate and the horizontal center line of the main cylinder machining reference hole is L, where L is 2-5mm.

[0016] The advantages of this invention are: by finely adjusting the rotation center of the brake caliper through the main eccentric top plate and the secondary eccentric top plate, the rotation center of the brake caliper is made consistent with the rotation center of the machine tool spindle, resulting in high machining accuracy and good product quality.

[0017] Figure 1 This is a schematic diagram of the structure of the present invention.

[0018] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0019] Figure 3 This is a schematic diagram of the exploded structure of the present invention.

[0020] Figure 4 This is a schematic diagram of the structure of the secondary eccentric top plate of the present invention.

[0021] Figure 5 This is a schematic diagram of the main eccentric top plate and the secondary eccentric top plate of the present invention.

[0022] Figure 6 This is a schematic diagram of the main eccentric top plate of the present invention.

[0023] Figure 7 This is a schematic diagram of the main structure of the secondary eccentric top plate of the present invention. Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0026] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0027] In the description of the embodiments of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, they are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, if terms such as "first" or "second" appear in the description of this invention, they are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0028] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0029] As shown in the attached drawings, the present invention includes a lathe spindle 1, a spindle hydraulic cylinder 2 disposed within the lathe spindle 1, and a caliper clamp. A transition plate is provided at the end of the lathe spindle 1, and the caliper clamp is mounted on the transition plate.

[0030] The caliper clamp includes a component mounting base 3, a caliper top tube 4, a main eccentric top plate 5, and a secondary eccentric top plate 6.

[0031] The component mounting base 3 is mounted on the transition plate, the caliper top tube 4 is mounted on the piston rod end of the main spindle hydraulic cylinder 2, the caliper top tube 4 is located inside the component mounting base 3, the main eccentric top plate 5 is detachably mounted on the component mounting base 3, and the secondary eccentric top plate 6 is detachably mounted in the middle of the main eccentric top plate 5. The main spindle hydraulic cylinder 2 drives the caliper top tube 4 to press the brake caliper master cylinder onto the secondary eccentric top plate 6. The main eccentric top plate 5 and the secondary eccentric top plate 6 are used to adjust the machining deviation of the center axis of the brake caliper master cylinder.

[0032] The caliper top tube 4 has a threaded hole at the bottom and a V-shaped cylinder clearance groove 7 at the top. The caliper top tube 4 is threaded onto the piston rod end of the main shaft hydraulic cylinder 2. Since the tail of the brake caliper cylinder is not a uniform plane, the V-shaped cylinder clearance groove 7 allows the protruding tail position to be cleared, so that the caliper top tube 4 can smoothly rest against the brake caliper.

[0033] The component mounting base 3 includes a spindle facet 8, a pair of outer side plates 9, and an outer mounting plate 10. A top tube through hole is opened at the center of the spindle facet 8, and a caliper top tube 4 is located in the top tube through hole. The spindle facet 8 is mounted on the transition plate by bolts. The pair of outer side plates 9 are symmetrically distributed and mounted on the spindle facet 8 by bolts. A top plate mounting groove 11 is opened in the middle of the outer mounting plate 10. A caliper placement hole 12 is opened in the middle of the top plate mounting groove 11. A set of threaded holes are evenly distributed in a ring on the top plate mounting groove 11. The main eccentric top plate 5 is mounted in the top plate mounting groove 11 by bolts. The outer mounting plate 10 is mounted on the pair of outer side plates 9 by bolts.

[0034] A set of semi-circular toothed grooves 13 are evenly distributed around the outer edge of the main eccentric top plate 5. A secondary top plate mounting groove is opened at the bottom of the main eccentric top plate 5. A caliper mounting hole 14 is opened in the middle of the main eccentric top plate 5. A set of secondary top plate fixing threaded holes 15 are arranged in a ring on the main eccentric top plate 5 located on both sides of the caliper mounting hole 14. A set of bolts passes through the corresponding semi-circular toothed grooves 13 on the main eccentric top plate 5 and is screwed into the threaded holes of the top plate mounting groove 11 to fix the main eccentric top plate 5 in the top plate mounting groove 11.

[0035] A set of semi-circular toothed grooves 20 are evenly distributed around the outer edge of the secondary eccentric top plate 6. A set of bolts passes through the corresponding semi-circular toothed grooves 20 on the secondary eccentric top plate 6 and is screwed into the secondary top plate fixing threaded hole 15 of the main eccentric top plate 5 to fix the secondary eccentric top plate 6 in the secondary top plate mounting groove. A main cylinder machining reference hole 16 is opened in the middle of the secondary eccentric top plate 6. An annular support protrusion 17 is provided on the main cylinder machining reference hole 16. An arc-shaped caliper placement groove 18 is opened on the secondary eccentric top plate 6. The top of the arc-shaped caliper placement groove 18 is connected to the main cylinder machining reference hole 16. A pair of caliper inner wall limiting arc surfaces 19 are formed on the arc-shaped caliper placement grooves 18 on both sides of the main cylinder machining reference hole 16. A pair of caliper pins are provided on the secondary eccentric top plate 6 located on both sides of the main cylinder machining reference hole 16. The pair of caliper pins are respectively inserted into the guide pin holes corresponding to the brake calipers.

[0036] The secondary eccentric top plate 6 has a pair of threaded holes. A pair of caliper pins are a rhomboid locating pin 21 and a cylindrical locating pin 22. Each of the rhomboid locating pin 21 and the cylindrical locating pin 22 has external threads on its outer wall. The rhomboid locating pin 21 and the cylindrical locating pin 22 are threaded into the corresponding threaded holes in the secondary eccentric top plate 6 and secured with nuts. The rhomboid locating pin 21 allows for a slight adjustment of the brake caliper after insertion.

[0037] The main eccentric top plate 5 is a circular top plate. The outer disk has a semi-circular toothed groove 13 on the main eccentric top plate 5, and the inner disk has a caliper mounting hole 14 on the main eccentric top plate 5. The eccentric distance between the vertical center line of the outer disk of the main eccentric top plate 5 and the vertical center line of the inner disk of the main eccentric top plate 5 is K, where K is 2-5mm.

[0038] The secondary eccentric top plate 6 is a circular top plate. The eccentric distance between the horizontal center line of the secondary eccentric top plate 6 and the horizontal center line of the main cylinder machining reference hole 16 is L, where L is 2-5mm.

[0039] Example 1: The operator uses a dial indicator to measure the radial runout between the main cylinder machining reference hole 16 and the lathe spindle centerline to reflect the deviation. According to the direction and magnitude of the deviation, the operator loosens multiple bolts in the A semi-circular tooth groove 13 and rotates the main eccentric top plate 5 in the top plate mounting groove 11. Only one A semi-circular tooth groove 13 is rotated at a time. The center position of the main eccentric top plate 5 is finely adjusted by the eccentricity of the outer and inner discs of the main eccentric top plate 5. After the adjustment is completed, the main eccentric top plate 5 is fixed in the top plate mounting groove 11 with bolts.

[0040] Insert a wrench into the gap between the main spindle faceplate 8 and the outer mounting plate 10 to loosen the bolts in the B semi-circular toothed groove 20. Rotate the secondary eccentric top plate 6. Fine-tune the center of the secondary eccentric top plate 6 by measuring the deviation between its horizontal centerline and the horizontal centerline of the main cylinder machining reference hole 16. During adjustment, rotate one B semi-circular toothed groove 20 at a time. The eccentricity of the secondary eccentric top plate 6 differs from that of the main eccentric top plate 5 by 90°, as shown in the attached diagram. One of these directions is vertical (Y-axis direction), and the other is horizontal (X-axis direction). The deviation of the center of the main cylinder machining reference hole 16 at any position can be adjusted by the vertical and horizontal eccentricities.

[0041] After adjustment, the operator places the brake caliper into the main cylinder machining reference hole 16 and the caliper mounting hole 14. The rhomboid locating pin 21 and the cylindrical locating pin 22 are inserted into the corresponding guide pin holes of the brake caliper. The inner wall of the brake caliper abuts against the pair of caliper inner wall limiting arc surfaces 19. The main spindle hydraulic cylinder 2 is started to drive the caliper top tube 4 to extend, pressing the brake caliper onto the annular support protrusion 17. The brake caliper is then fixed and can be processed.

[0042] After machining is completed, the spindle hydraulic cylinder 2 retracts, and the operator moves the brake caliper downwards until it retracts to the bottom of the caliper mounting hole 14, exposing the caliper housing. Then, the brake caliper is pulled out into the gap between the spindle faceplate 8 and the outer mounting plate 10, and the brake caliper is then pulled upwards.

Claims

1. A machining fixture for the master cylinder bore of a hydraulic disc brake caliper for automobiles, comprising a lathe spindle (1), a spindle hydraulic cylinder (2) disposed within the lathe spindle (1), and a caliper fixture, wherein a transition plate is provided at the end of the lathe spindle (1), and the caliper fixture is mounted on the transition plate. Its features The caliper clamp includes a component mounting base (3), a caliper top tube (4), a main eccentric top plate (5), and a secondary eccentric top plate (6). The component mounting base (3) is mounted on the transition plate, the caliper top tube (4) is mounted on the piston rod end of the main spindle hydraulic cylinder (2), the caliper top tube (4) is located inside the component mounting base (3), the main eccentric top plate (5) is detachably mounted on the component mounting base (3), the secondary eccentric top plate (6) is detachably mounted in the middle of the main eccentric top plate (5), the main spindle hydraulic cylinder (2) drives the caliper top tube (4) to press the brake caliper main cylinder onto the secondary eccentric top plate (6), the main eccentric top plate (5) and the secondary eccentric top plate (6) are respectively used to adjust the machining deviation of the center axis of the brake caliper main cylinder; The caliper top tube (4) has a threaded hole at the bottom and a V-shaped cylinder clearance groove (7) at the top. The caliper top tube (4) is threadedly installed at the end of the piston rod of the main shaft hydraulic cylinder (2). The component mounting base (3) includes a spindle disc (8), a pair of outer side plates (9) and an outer mounting plate (10). A top tube through hole is opened at the center of the spindle disc (8). The caliper top tube (4) is located in the top tube through hole. The spindle disc (8) is mounted on the transition plate by bolts. A pair of outer side plates (9) are symmetrically distributed and mounted on the spindle disc (8) by bolts. A top plate mounting groove (11) is opened in the middle of the outer mounting plate (10). A caliper placement hole (12) is opened in the middle of the top plate mounting groove (11). A set of threaded holes are evenly distributed in a ring on the top plate mounting groove (11). The main eccentric top plate (5) is mounted in the top plate mounting groove (11) by bolts. The outer mounting plate (10) is mounted on a pair of outer side plates (9) by bolts. A set of semi-circular toothed grooves (13) are evenly distributed around the outer edge of the main eccentric top plate (5). A secondary top plate mounting groove is opened at the bottom of the main eccentric top plate (5). A caliper mounting hole (14) is opened in the middle of the main eccentric top plate (5). A set of secondary top plate fixing threaded holes (15) are arranged in a ring on the main eccentric top plate (5) located on both sides of the caliper mounting hole (14). A set of bolts passes through the corresponding semi-circular toothed grooves (13) on the main eccentric top plate (5) and is screwed into the threaded hole of the top plate mounting groove (11) to fix the main eccentric top plate (5) in the top plate mounting groove (11). The outer edge of the secondary eccentric top plate (6) has a set of B semi-circular toothed grooves (20) evenly distributed around it. A set of bolts passes through the corresponding B semi-circular toothed grooves (20) on the secondary eccentric top plate (6) and is screwed into the secondary top plate fixing threaded hole (15) of the main eccentric top plate (5) to fix the secondary eccentric top plate (6) in the secondary top plate mounting groove. The secondary eccentric top plate (6) has a main cylinder machining reference hole (16) in the middle, and an annular support protrusion (17) is provided on the main cylinder machining reference hole (16). An arc-shaped caliper placement groove (18) is opened on the auxiliary eccentric top plate (6). The top of the arc-shaped caliper placement groove (18) is connected to the main cylinder machining reference hole (16). A pair of caliper inner wall limiting arc surfaces (19) are formed on the arc-shaped caliper placement groove (18) on both sides of the main cylinder machining reference hole (16). A pair of caliper pins are provided on the auxiliary eccentric top plate (6) on both sides of the main cylinder machining reference hole (16). The pair of caliper pins are respectively inserted into the guide pin holes corresponding to the brake calipers. The secondary eccentric top plate (6) has a pair of threaded holes. The pair of caliper pins are a rhomboid locating pin (21) and a cylindrical locating pin (22). The outer wall of one end of the rhomboid locating pin (21) and the cylindrical locating pin (22) are respectively provided with external threads. The rhomboid locating pin (21) and the cylindrical locating pin (22) are respectively threaded into the corresponding threaded holes of the secondary eccentric top plate (6) and respectively locked by nuts. The main eccentric top plate (5) is a circular top plate. The outer disk has a semi-circular toothed groove (13) on the main eccentric top plate (5), and the inner disk has a caliper mounting hole (14) on the main eccentric top plate (5). The eccentric distance between the vertical center line of the outer disk of the main eccentric top plate (5) and the vertical center line of the inner disk of the main eccentric top plate (5) is K, where K is 2-5mm. The secondary eccentric top plate (6) is a circular top plate. The eccentric distance between the horizontal center line of the secondary eccentric top plate (6) and the horizontal center line of the main cylinder machining reference hole (16) is L, where L is 2-5mm.

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