Master cylinder inner skin bowl mounting tool

Abstract

This application provides a master cylinder cup installation tool for inserting into the cylinder bore of the master cylinder to install the cup into a groove within the bore. The tool includes a limiting sleeve, a sleeve, and a center rod. One end of the limiting sleeve has a limiting frustum, and one end of the sleeve has a pressing portion. The first end of the center rod passes through the sleeve and has a limiting structure slidably connected to the sleeve. The second end extends out of the pressing portion and has a guide seat. The center rod has a first guide block with a first arc-shaped end face near the guide seat and a first gap between the guide block and the guide seat. The cup is fitted into the first gap, and the cup is flipped to fit against the first arc-shaped end face. The installation tool is inserted into the cylinder bore. When the limiting structure abuts against the limiting frustum, the sleeve is pushed, and the cup's elasticity causes it to unfold and embed into the groove. This method allows for simple and efficient cup installation without excessive compression that could cause the cup to shrink and deform, reducing the damage rate during installation.

Description

Technical Field

[0001] This application relates to the field of automotive braking system technology, and in particular to a master cylinder inner piston cup installation tool. Background Technology

[0002] The master cylinder is the core hydraulic control component of an automotive braking system, typically integrated with the hydraulic control unit (HCU) for Electronic Stability Control (ESC), Anti-lock Braking System (ABS), or regenerative braking systems (such as in new energy vehicles). The brake cup is the core sealing element of the master cylinder, responsible for maintaining a hydraulic seal during piston movement to prevent brake fluid leakage. During assembly, the annular brake cup is installed from the master cylinder bore into a groove within the bore. Because the cup's diameter is too large to be directly inserted into the groove from the bore, it must be manually squeezed to shrink and deform before passing through the bore. Once in the groove, the cup is then unfolded to embed itself. This existing assembly method is inefficient and prone to damaging the cup; therefore, a tool for convenient and efficient installation of the brake cup is urgently needed. Utility Model Content

[0003] The purpose of this application is to address the above problems by providing a master cylinder cup installation tool for inserting into the master cylinder bore to install the cup into a groove within the bore, comprising: A limiting sleeve, wherein the outer diameter of the limiting sleeve is smaller than the diameter of the cylinder bore, and one end of the limiting sleeve has a limiting frustum; A sleeve, one end of which has a compression portion; A central rod has a first end and a second end. The first end passes through the sleeve and is provided with a limiting structure. The limiting structure passes through the side wall of the sleeve and is slidably connected to the sleeve. The second end extends out of the extrusion part and is provided with a guide seat. The central rod and the sleeve can extend into the limiting sleeve. When the limiting structure abuts against the limiting platform, the guide seat extends out from the end of the limiting sleeve away from the limiting platform. A first guide block is disposed on the central rod. The first guide block and the extrusion part respectively cover the circumferential surface of the central rod at 180° along the circumference of the central rod. The first guide block has a first arc-shaped end face on the side near the guide seat, and there is a first gap between the first arc-shaped end face and the guide seat.

[0004] According to certain embodiments of the present application, the technical solutions provided are as follows: The sleeve and the central rod have a first relative position and a second relative position; When the sleeve and the center rod are in the first relative position, there is a second gap between the extrusion part and the guide seat, and the second gap is greater than the first gap; When the sleeve and the center rod are in the second relative position, the extrusion part abuts against the guide seat.

[0005] According to the technical solutions provided in certain embodiments of this application, a second guide block is provided in the first gap, and the second guide block has a second arc-shaped end face on the side away from the central rod. The distance between the second arc-shaped end face and the outer periphery of the central rod increases from the side closer to the first guide block to the side away from the first guide block.

[0006] According to the technical solutions provided in certain embodiments of this application, when the limiting sleeve is inserted into the cylinder bore, the limiting frustum abuts against the cylinder bore port, and one end of the limiting sleeve away from the limiting frustum is located on the side of the groove near the cylinder bore port.

[0007] According to the technical solutions provided in certain embodiments of this application, when the sleeve and the center rod are inserted into the limiting sleeve, the limiting structure abuts against the limiting round platform, and the end face of the guide seat near the first guide block is aligned with the inner wall surface of the groove away from the cylinder bore port along the axial direction of the center rod.

[0008] According to the technical solutions provided in certain embodiments of this application, the sleeve is elastically connected to the first end through an elastic element.

[0009] According to certain embodiments of the present application, the technical solutions provided are as follows: The sleeve has a strip-shaped hole extending along its own axis, and the two strip-shaped holes are symmetrically arranged about the central axis of the sleeve. The limiting structure is a limiting pin, which is radially disposed at the first end along the central rod, and the two ends of the limiting pin pass through the two strip holes respectively.

[0010] According to the technical solutions provided in certain embodiments of this application, the guide seat has a tapered end face on the side away from the first guide block.

[0011] According to the technical solutions provided in certain embodiments of this application, a handle is provided at one end of the sleeve away from the extrusion part.

[0012] According to the technical solutions provided in certain embodiments of this application, the guide seat has a rounded corner structure at one end edge near the first guide block.

[0013] Compared with the prior art, the beneficial effects of this application are as follows: This application provides a master cylinder inner cup installation tool for inserting into the cylinder bore of the master cylinder to install the cup into the groove inside the cylinder bore. It includes a limiting sleeve, a sleeve, and a center rod. The outer diameter of the limiting sleeve is smaller than the diameter of the cylinder bore, and one end of the limiting sleeve has a limiting frustum. One end of the sleeve has a pressing portion. The center rod has a first end and a second end. The first end passes through the sleeve and is provided with a limiting structure. The limiting structure penetrates the side wall of the sleeve and is slidably connected to the sleeve. Next, the second end extends out of the extrusion section and is provided with a guide seat. The central rod and the sleeve can extend into the limiting sleeve. When the limiting structure abuts against the limiting round table, the guide seat extends from the end of the limiting sleeve away from the limiting round table. The central rod is provided with a first guide block. The first guide block and the extrusion section respectively cover the circumferential surface of the central rod at 180° along the circumference. The side of the first guide block near the guide seat has a first arc-shaped end face, and there is a first gap between the first arc-shaped end face and the guide seat. In use, the leather cup sleeve is placed... The center rod is positioned with one part at the first gap. The other part of the cup is flipped so that it fits against the first arc-shaped end face, making the projected area of ​​the cup along the center rod axis smaller than the inner diameter of the limiting sleeve. The limiting sleeve is inserted into the cylinder bore until the limiting frustum abuts against the main cylinder. The sleeve and the center rod are inserted into the limiting sleeve together until the limiting structure abuts against the limiting frustum. At this time, the part of the cup in the first gap corresponds to the position of the groove. The sleeve is pushed through the extrusion part to extrude the flipped part of the cup. Due to the limitation of the limiting sleeve, the flipped part of the cup cannot unfold directly. The force of the extrusion part is then transmitted to the part of the cup in the first gap. This part moves away from the center rod and into the groove. The flipped part of the cup is pushed out of the limiting sleeve by the extrusion part and unfolds under the elasticity of the cup itself and embeds into the groove. In this way, the cup can be installed into the main cylinder simply and efficiently without excessively extruding the cup to cause it to shrink and deform, which greatly reduces the damage rate of the cup during installation.

[0014] It should be understood that the descriptions of technical features, technical solutions, beneficial effects, or similar language in this application do not imply that all features and advantages can be achieved in any single embodiment. Rather, it is understood that the description of a feature or beneficial effect means that a specific technical feature, technical solution, or beneficial effect is included in at least one embodiment. Therefore, the descriptions of technical features, technical solutions, or beneficial effects in this specification do not necessarily refer to the same embodiment. Furthermore, the technical features, technical solutions, and beneficial effects described in this embodiment can be combined in any suitable manner. Those skilled in the art will understand that embodiments can be implemented without one or more specific technical features, technical solutions, or beneficial effects of a particular embodiment. In other embodiments, additional technical features and beneficial effects may be identified in specific embodiments that do not embody all embodiments. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A front view of a master cylinder inner cup installation tool provided in an embodiment of this application; Figure 2 A side view of a master cylinder inner cup installation tool provided in an embodiment of this application; Figure 3 A cross-sectional view of a main cylinder inner cup installation tool provided in an embodiment of this application; Figure 4 A schematic diagram of the sleeve and center rod of a master cylinder inner cup installation tool provided in this application embodiment; Figure 5 This is a schematic diagram of a master cylinder inner cup installation tool inserted into the master cylinder, as provided in an embodiment of this application. Figure 6 for Figure 5 Enlarged view of section A.

[0017] The text labels in the image represent: 1. Limiting sleeve; 2. Sleeve; 3. Center rod; 4. Elastic element; 5. Handle; 6. Main cylinder; 7. Groove; 11. Limiting frustum; 21. Extrusion part; 22. Strip hole; 31. Limiting pin; 32. Guide seat; 33. First guide block; 34. Second guide block; 101. First gap; 102. Second gap. Detailed Implementation

[0018] To enable those skilled in the art to better understand the technical solutions of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. The descriptions in this section are merely illustrative and explanatory, and should not be construed as limiting the scope of protection of this application. Specifically, the described embodiments are only some embodiments of this application, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort should fall within the scope of protection of this invention.

[0019] It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such process, method, product, or apparatus.

[0020] As mentioned in the background section, to address the problems existing in the prior art, this embodiment provides a master cylinder cup installation tool for inserting into the cylinder bore of the master cylinder 6 to install the cup into the groove 7 within the cylinder bore, comprising: The limiting sleeve 1 has an outer diameter smaller than the diameter of the cylinder bore, and one end of the limiting sleeve 1 has a limiting frustum 11. Sleeve 2, one end of sleeve 2 has a compression part 21; The center rod 3 has a first end and a second end. The first end passes through the sleeve 2 and is provided with a limiting structure. The limiting structure passes through the side wall of the sleeve 2 and is slidably connected with the sleeve 2. The second end extends out of the extrusion part 21 and is provided with a guide seat 32. The center rod 3 and the sleeve 2 can extend into the limiting sleeve 1. When the limiting structure abuts against the limiting frustum 11, the guide seat 32 extends out from the end of the limiting sleeve 1 away from the limiting frustum 11. The first guide block 33 is disposed on the central rod 3. The first guide block 33 and the extrusion part 21 respectively cover the circumferential surface of the central rod 3180° along the circumference of the central rod 3. The first guide block 33 has a first arc-shaped end face on the side near the guide seat 32. There is a first gap 101 between the first arc-shaped end face and the guide seat 32.

[0021] like Figure 1-6As shown, the cylinder bore is opened on the main cylinder 6, and the inner wall of the cylinder bore has an annular protrusion with a groove 7. Therefore, when installing the cup into the groove 7, the cup needs to pass through the inner circle of the annular protrusion, whose inner diameter is smaller than the cup's diameter. The outer diameter of the limiting sleeve 1 is smaller than the diameter of the cylinder bore. The limiting sleeve 1 can be inserted into the main cylinder 6 through the cylinder bore, and the limiting frustum 11 can abut against the cylinder bore port for positioning the cup for subsequent installation. The sleeve 2 is slidably connected to the center rod 3, and the first end of the center rod 3 is connected by the extrusion part 21. The first end is inserted into the sleeve 2, and a limiting structure is provided on the first end. The limiting structure penetrates the side wall of the sleeve 2 and is used to limit the relative sliding between the sleeve 2 and the central rod 3. The second end is located outside the sleeve 2 and is provided with a guide seat 32. The first guide block 33 is approximately shovel-shaped and is fixed to the central rod 3 near the guide seat 32 by bolts. The first guide block 33 and the extrusion part 21 respectively cover the 180° circumferential surface of the central rod 3 along the circumference of the central rod 3. The first gap 101 is used to set the leather cup.

[0022] Furthermore, when the limiting sleeve 1 is inserted into the cylinder bore, the limiting frustum 11 abuts against the cylinder bore port, and the end of the limiting sleeve 1 away from the limiting frustum 11 is located on the side of the groove 7 near the cylinder bore port. Specifically, when the end of the limiting sleeve 1 away from the limiting frustum 11 is inserted into the main cylinder 6 from the cylinder hole until it abuts against the annular protrusion, the limiting frustum 11 also abuts against the main cylinder 6. Therefore, the limiting frustum 11 can limit the center rod 3 by interacting with the limiting structure, and the end of the limiting sleeve 1 away from the limiting frustum 11 is used to limit the installation position of the leather cup.

[0023] Furthermore, when the sleeve 2 and the center rod 3 are inserted into the limiting sleeve 1, the limiting structure abuts against the limiting frustum 11, and the end face of the guide seat 32 near the first guide block 33 is aligned with the inner wall surface of the groove 7 away from the cylinder bore port along the axial direction of the center rod 3. Specifically, when the sleeve 2 and the center rod 3 are inserted into the limiting sleeve 1 together, one end of the center rod 3 with the guide seat 32 extends into the limiting sleeve 1 until the limiting structure abuts against the limiting frustum 11. At this time, the guide seat 32 extends out from the end of the limiting sleeve 1 away from the limiting frustum 11. The top end face of the guide seat 32 is aligned vertically with the lower surface of the groove 7. Since part of the cup is fitted in the first gap 101, that is, the side of the guide seat 32 close to the first guide block 33, when the sleeve 2 is pushed through the extrusion part 21 to extrude the other part of the cup, the elasticity of the cup itself can cause the part of the cup located in the first gap 101 to slide into the groove 7 from the end face of the guide seat 32 close to the first guide block 33, ensuring that the cup accurately enters the groove 7.

[0024] In use, the cup is fitted onto the center rod 3, with a portion positioned at the first gap 101. The other part of the cup is flipped so that it fits against the first arc-shaped end face, making the projected area of ​​the cup along the axial direction of the center rod 3 smaller than the inner diameter of the limiting sleeve 1. The limiting sleeve 1 is inserted into the cylinder bore until the limiting frustum 11 abuts against the main cylinder 6. The sleeve 2 and the center rod 3 are then inserted into the limiting sleeve 1 together, so that the limiting structure abuts against the limiting frustum 11. At this point, the portion of the cup located at the first gap 101 corresponds to the position of the groove 7. The sleeve 2 is then pushed through the extrusion section 21 to extrude the cup. Due to the restriction of the limiting sleeve 1, the flipped-up part of the cup cannot be directly unfolded. As a result, the force of the squeezing part 21 is transmitted to the part of the cup located at the first gap 101. This part moves away from the center rod 3 and enters the groove 7. The flipped-up part of the cup is pushed out of the limiting sleeve 1 by the squeezing part 21 and unfolds under the elasticity of the cup itself and is embedded in the groove 7. In this way, the cup can be installed into the main cylinder 6 simply and efficiently, without excessive squeezing of the cup to cause it to shrink and deform, which greatly reduces the damage rate of the cup during installation.

[0025] In a preferred embodiment, The sleeve 2 has a strip-shaped hole 22 extending along its own axis, and the two strip-shaped holes 22 are symmetrically arranged about the central axis of the sleeve 2; The limiting structure is a limiting pin 31, which is radially located at the first end along the central rod 3, and the two ends of the limiting pin 31 pass through two strip holes 22 respectively.

[0026] In a preferred embodiment, the sleeve 2 is elastically connected to the first end via an elastic element 4.

[0027] like Figure 2 and Figure 4 As shown, the limiting pin 31 is installed radially through the central rod 3. The two ends of the limiting pin 31 correspond to the two strip holes 22 on the sleeve 2, respectively. The limiting pin 31 can slide within the two strip holes 22, so that the sleeve 2 and the central rod 3 can slide relative to each other within the length range of the strip holes 22. The elastic element 4 is a spring in the prior art. The two ends of the elastic element 4 are connected to the sleeve 2 and the central rod 3, respectively.

[0028] In a preferred embodiment, Sleeve 2 and center rod 3 have a first relative position and a second relative position; When the sleeve 2 and the center rod 3 are in the first relative position, there is a second gap 102 between the extrusion part 21 and the guide seat 32, and the second gap 102 is greater than the first gap 101. When the sleeve 2 and the center rod 3 are in the second relative position, the extrusion part 21 abuts against the guide seat 32.

[0029] like Figure 1 and Figure 4As shown, when the limiting pin 31 abuts against the end of the strip hole 22 near the pressing part 21, the pressing part 21 separates from the guide seat 32, creating a second gap 102 between them. The second gap 102 is also used to set the cup. When the cup is placed on the center rod 3 and a part of it is located at the first gap 101, the other part of the cup is flipped so that the cup fits against the first arc-shaped end face. The flipped end of the cup can be accommodated in the second gap 102. At this time, the sleeve 2 and the center rod 3 are in the first relative position mentioned above. When the limiting pin 31 abuts against the end of the strip hole 22 away from the pressing part 21, the elastic element 4 is compressed, and the pressing part 21 moves towards the side near the guide seat 32 until it abuts against the guide seat 32. The second gap 102 disappears. At this time, the sleeve 2 and the center rod 3 are in the second relative position mentioned above.

[0030] In a preferred embodiment, a second guide block 34 is provided in the first gap 101. The second guide block 34 has a second arc-shaped end face on the side away from the center rod 3. The distance between the second arc-shaped end face and the outer periphery of the center rod 3 increases from the side closer to the first guide block 33 to the side away from the first guide block 33.

[0031] like Figure 1 and Figure 4 As shown, the first guide block 33 has an installation groove along its own centerline on the side near the center rod 3. The second guide block 34 has an integrally connected first block and second block. The first block is embedded in the installation groove and installed on the center rod 3 together with the first guide block 33. The first guide block 33 is fixed to the center rod 3 by bolts. At the same time, the first guide block 33 presses the first block against the center rod 3, thereby fixing the second guide block 34 to the center rod 3. The second block is located at the first gap 101, and the side of the second block away from the center rod 3 has a second arc-shaped end face. In use, firstly, the leather cup is placed on the first gap 101 position on the center rod 3, and one end of the leather cup is pulled to flip it up towards the pressing part 21. Part of the leather cup enters the first gap 101 and abuts against the center rod 3. On the second arc-shaped end face, the entire cup fits against the first arc-shaped end face. At this time, the projected area of ​​the cup along the axis of the central rod 3 is smaller than the inner diameter of the limiting sleeve 1. The central rod 3 can drive the cup to extend into the limiting sleeve 1 together. The limiting sleeve 1 is inserted into the cylinder hole, and then the sleeve 2 and the central rod 3 are inserted into the limiting sleeve 1 together, so that the limiting pin 31 abuts against the limiting frustum 11. Pushing the sleeve 2, the squeezing part 21 can push the cup to flip up. Due to the restriction of the limiting sleeve 1, the flipped part of the cup cannot be directly unfolded, and the force of the squeezing part 21 is transmitted to the part of the cup located in the first gap 101. The part of the cup located in the first gap 101 can slide along the second arc-shaped end face to the groove 7 side, so that the cup can be inserted into the groove 7 more quickly and accurately during installation.

[0032] In a preferred embodiment, the guide seat 32 has a tapered end face on the side away from the first guide block 33.

[0033] like Figure 1 As shown, the guide seat 32 is composed of an integrally connected cylindrical structure and a frustum structure. The frustum structure is located at the end of the cylindrical structure away from the first guide block 33. The conical end face of the frustum structure can guide the guide seat 32 when it passes through the cup and the limiting sleeve 1, thereby increasing the installation efficiency of the cup.

[0034] Furthermore, the guide seat 32 has a rounded corner structure at one end edge near the first guide block 33; Specifically, when the cup is installed and the center rod 3 and sleeve 2 need to be pulled out from the limiting sleeve 1, since the guide seat 32 is located on the side of the groove 7 away from the cylinder hole port, the guide seat 32 needs to pass through the center hole of the cup during the extraction process. Therefore, a rounded corner structure is set on the edge of the cylinder near the first guide block 33 to prevent the guide seat 32 from scratching the cup during the extraction process.

[0035] In a preferred embodiment, a handle 5 is provided at the end of the sleeve 2 away from the compression part 21.

[0036] like Figure 1 As shown, the handle 5 is installed at the end of the sleeve 2 away from the extrusion part 21, which provides the operator with a point of leverage for the hand when operating the sleeve 2 during the installation of the cup, making the installation process of the cup more convenient. Furthermore, the end of the elastic element 4 away from the center rod 3 can be fixed to the handle 5, thereby realizing the elastic connection between the sleeve 2 and the center rod 3.

[0037] Working principle: In use, firstly, insert the limiting sleeve 1 into the cup through the cylinder hole. The end of the limiting sleeve 1 away from the limiting frustum 11 abuts against the annular protrusion, and the limiting frustum 11 also abuts against the main cylinder 6. Secondly, when the sleeve 2 and the center rod 3 are in the first relative position, place the cup on the center rod 3 from the guide seat 32 side, so that part of the cup is located at the first gap 101. Flip the other part of the cup towards the extrusion part 21 so that the cup fits against the first arc-shaped end face. Then, insert the sleeve 2 and the center rod 3 together into the limiting sleeve 1 so that the limiting structure abuts against the limiting... On the truncated cone 11, hold the handle 5 and continue to push the sleeve 2. The squeezing part 21 squeezes the cup. The elasticity of the cup itself causes the part of the cup located at the first gap 101 to slide along the second arc end face into the groove 7 and enter the groove 7. At the same time, the part of the cup that is turned up moves towards the guide seat 32 under the push of the squeezing part 21. When this part moves out of the end of the limiting sleeve 2 away from the limiting cone 11, it can also enter the groove 7 through its own elasticity. At this point, the cup installation is completed. Finally, the sleeve 2, the center rod 3 and the limiting sleeve 1 are pulled out from the main cylinder 6 in sequence.

[0038] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. The above descriptions are only preferred embodiments of this application. It should be noted that due to the limitations of written expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of this invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of this application.

Claims

1. A tool for installing a diaphragm cup inside a main cylinder, used to extend into the cylinder bore of a main cylinder (6) to install the diaphragm cup into a groove (7) within the cylinder bore, characterized in that, include: A limiting sleeve (1) has an outer diameter smaller than the diameter of the cylinder bore, and one end of the limiting sleeve (1) has a limiting frustum (11). A sleeve (2), one end of which has a compression part (21); The center rod (3) has a first end and a second end. The first end passes through the sleeve (2) and is provided with a limiting structure. The limiting structure passes through the side wall of the sleeve (2) and is slidably connected with the sleeve (2). The second end extends out of the extrusion part (21) and is provided with a guide seat (32). The center rod (3) and the sleeve (2) can extend into the limiting sleeve (1). When the limiting structure abuts against the limiting frustum (11), the guide seat (32) extends out from the end of the limiting sleeve (1) away from the limiting frustum (11). The first guide block (33) is disposed on the central rod (3). The first guide block (33) and the extrusion part (21) respectively cover the circumferential surface of the central rod (3) at 180° along the circumference of the central rod (3). The first guide block (33) has a first arc-shaped end face on the side near the guide seat (32). There is a first gap (101) between the first arc-shaped end face and the guide seat (32).

2. The main cylinder inner cup installation tool according to claim 1, characterized in that, The sleeve (2) and the center rod (3) have a first relative position and a second relative position; When the sleeve (2) and the center rod (3) are in the first relative position, there is a second gap (102) between the extrusion part (21) and the guide seat (32), and the second gap (102) is greater than the first gap (101). When the sleeve (2) and the center rod (3) are in the second relative position, the pressing part (21) abuts against the guide seat (32).

3. The main cylinder inner cup installation tool according to claim 1, characterized in that, A second guide block (34) is provided in the first gap (101). The second guide block (34) has a second arc-shaped end face on the side away from the center rod (3). The distance between the second arc-shaped end face and the outer periphery of the center rod (3) increases from the side closer to the first guide block (33) to the side away from the first guide block (33).

4. The main cylinder inner cup installation tool according to claim 1, characterized in that, When the limiting sleeve (1) is inserted into the cylinder bore, the limiting frustum (11) abuts against the cylinder bore port, and one end of the limiting sleeve (1) away from the limiting frustum (11) is located on the side of the groove near the cylinder bore port.

5. The main cylinder inner cup installation tool according to claim 4, characterized in that, When the sleeve (2) and the center rod (3) are inserted into the limiting sleeve (1), the limiting structure abuts against the limiting frustum (11), and the end face of the guide seat (32) near the first guide block (33) is aligned with the inner wall of the groove away from the cylinder bore port along the axial direction of the center rod (3).

6. The main cylinder inner cup installation tool according to claim 1, characterized in that, The sleeve (2) is elastically connected to the first end via an elastic element (4).

7. The main cylinder inner cup installation tool according to claim 1, characterized in that, The sleeve (2) has a strip-shaped hole (22) extending along its own axis, and the two strip-shaped holes (22) are symmetrically arranged about the central axis of the sleeve (2); The limiting structure is a limiting pin (31), which is radially disposed at the first end along the central rod (3), and the two ends of the limiting pin (31) pass through the two strip holes (22) respectively.

8. The main cylinder inner cup installation tool according to claim 1, characterized in that, The guide seat (32) has a tapered end face on the side away from the first guide block (33).

9. The main cylinder inner cup installation tool according to claim 1, characterized in that, A handle (5) is provided at one end of the sleeve (2) away from the extrusion part (21).

10. A tool for installing a master cylinder inner cup according to claim 1, characterized in that, The guide seat (32) has a rounded corner structure at one end edge near the first guide block (33).

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