TWI675775B - Brake master cylinder - Google Patents

Abstract

Provided is a master cylinder for a brake, capable of suppressing abrasion of a rotating portion. Equipped with: a pull rod, which is arranged in front of the steering handle; and a power transmission device (15), which transmits the operating force to the rod to the piston; and a cylinder body, which is across the rod and the power transmission device (15) And a support shaft, which is inserted into the through hole (111) penetrating through the tie rod, the power transmission device (15), and the cylinder body, and rotatably supports the tie rod and the power transmission device (15) At the cylinder body; between at least any one of the position between the cylinder body and the tie rod, the position between the tie rod and the power transmission device (15), and the position between the force transmission device (15) and the cylinder body, at least An annular groove (91A, 92A) of the through hole (111).

Description

Master cylinder for brakes

The present invention relates to a master cylinder for brakes.

There is a brake device in which a notch is formed as an oil groove in an inner peripheral edge of a through hole into which a shaft of a support lever can be fitted (for example, refer to Patent Document 1). [Prior Art Literature] [Patent Literature]

Patent Document 1: Japanese Patent Application Laid-Open No. 2009-202653

[Problems to be Solved by the Invention]

The master cylinder for brakes has been required to suppress the wear of the rotating parts.

An object of the present invention is to provide a master cylinder for a brake capable of suppressing abrasion of a rotating portion. [Means for solving problems]

In order to achieve the above object, the present invention is at least any one of a position between a cylinder body and a tie rod, a position between the tie rod and a knob, and a position between the force transmitter and the cylinder. An intermediate slot is provided with an annular groove surrounding the through hole. [Inventive effect]

According to the present invention, it is possible to provide a master cylinder for a brake capable of suppressing abrasion of a rotating portion.

An embodiment of the present invention will be described based on the drawings. As shown in FIGS. 1 and 2, the present embodiment is a master cylinder 2 for a brake which is a reservoir body that forms a part of the master cylinder 2 for a brake 1. The master cylinder 2 for brakes refers to a master cylinder for brakes of a saddle-type vehicle such as a motorcycle, a buggy, and a four-wheeled cart, which are mounted in an exposed state. Here, for the convenience of explanation, the directions are shown in the front, back, left, right, up, down, and down directions, and the description will be given. The front, back, left, right, and up and down systems are substantially in accordance with the state of being mounted on the vehicle. As shown in FIG. 1, the master cylinder 2 for a brake is attached to a steering bar 3. Specifically, the master cylinder 2 for braking is disposed on the front side of the steering grip 4 on the right side held by the right hand of the driver, and the brake hydraulic pressure is introduced to the omitted illustration by the operation of the right hand of the driver. Front wheel braking device.

The master cylinder 2 for a brake is provided with a cylinder block 11, a holder 12, a cover portion 13, a tie rod 14, a force transmitter 15, a return spring 16, a support shaft 17, and a nut 18 shown in FIG. 2.

The cylinder block 11 is made of metal and is an integrally formed product by casting, and is arranged on the front side of the steering rod 3 as shown in FIG. 1. A protruding portion 31 is formed in the cylinder block 11 so as to be slightly further to the right than the center in the left-right direction and to project rearward. The cylinder block 11 is mounted on the steering rod 3 by holding the steering rod 3 with the protruding portion 31 and the holder 12. The protruding portion 31 and the holder 12 are coupled to hold the steering rod 3 by two fastening connection members 32 belonging to the bolt. It should be noted that only one fastening connection member 32 is shown in a relationship shown in a plan view in FIG. 1.

As shown in FIG. 3, the cylinder block 11 is provided above and below the right side portion thereof, and is provided with a plate-shaped upper support piece portion 35 and a lower support piece portion 36. The upper support piece portion 35 and the lower support piece portion 36 are lowered and projected forward toward the front. The upper support piece portion 35 is formed with a hole portion 37 penetrating the upper support piece portion 35 in the thickness direction, and the lower support piece portion 36 is also formed with a hole portion 38 penetrating the lower support piece portion 36 in the thickness direction. These hole portions 37 and 38 are formed so that their center axes are aligned with each other. The hole portion 37 is orthogonal to the lower surface 35a shown in (a) of FIG. 4 where the upper support piece portion 35 is flat, and the hole portion 38 is (b) of FIG. 4 which is flat to the lower support piece portion 36 The illustrated upper surface 36a is orthogonal. The lower surface 35a and the upper surface 36a are parallel. The hole portion 37 has a larger diameter than the hole portion 38.

As shown in FIG. 1, a lens mounting portion 41 is formed on the cylinder 11 at an upper portion between the protruding portion 31 and the upper support piece portion 35 so as to protrude upward. The lens mounting portion 41 is a portion where a rearview mirror (not shown) can be mounted. As shown in FIG. 2, a mounting seat 44 is formed on the lower portion of the cylinder block 11 so that a wire stay 43 can be fixed by a screw member 42.

As shown in FIG. 1, the cylinder block 11 is provided with a pressure cylinder 50 extending from the base end side of the protruding portion 31 to the left. The pressure cylinder 50 is arranged in front of the steering rod 3 so as to follow the axial direction of the steering handle 4. The pressure cylinder 50 is formed in a bottomed cylindrical shape opened at a position between the upper support piece portion 35 and the lower support piece portion 36 shown in FIG. The piston 51 is shown in dotted lines. In other words, the cylinder block 11 accommodates the piston 51 in the pressure cylinder 50 in a slidable manner. The piston 51 moves along the axial direction of the steering handle 4 and is pushed into the pressure cylinder 50 to generate a brake hydraulic pressure.

As shown in FIG. 2, the pressure cylinder 50 is formed at the lower portion of the cylinder block 11, and a tank wall portion 52 is formed from the middle portion to the upper portion of the cylinder block 11. The tank wall portion 52 is formed in a cylindrical shape along the vertical direction, and the opening at the upper end is closed by the lid portion 13. Brake fluid is stored inside the tank wall portion 52. The tank wall portion 52 is connected to the pressure cylinder 50 inside. A window hole 53 is formed in front of the tank wall portion 52, and a transparent window member 54 is fitted in the window hole 53. The amount of brake fluid inside the tank wall portion 52 can be visually viewed through the window member 54.

The tie rod 14 is made of metal. A base portion 61 is provided at the middle portion of the tie rod 14 in the longitudinal direction, and a plate-shaped supported portion 62 is provided from the base portion 61 to one end portion in the longitudinal direction. The supported portion 62 extends from the upper portion of the base portion 61 along the longitudinal direction of the tie rod 14. Further, the tie rod 14 is provided from the base portion 61 to the other end portion in the longitudinal direction, and an operation portion 63 that is operated by driving is provided.

As shown in FIG. 3, the supported portion 62 includes: a plate-like main plate portion 71 that mainly constitutes the supported portion 62; and a circular upper side boss portion 72 that extends from the main plate portion 71. The surface protrudes upward; and the circular lower side boss portion 73 protrudes downward from the lower surface of the main plate portion 71; and the abutting portion 74 at the front end of the main plate portion 71. The upper boss portion 72 and the lower boss portion 73 align the central axis, and a hole portion 75 is formed on the central axis and penetrates the supported portion 62 in the thickness direction.

The upper end surface 72 a shown in FIG. 5 of the upper boss portion 72 is a flat surface, and the lower end surface 73 a of the lower boss portion 73 shown in FIG. 6 is also a flat surface. The upper end surface 72a and the lower end surface 73a are parallel and orthogonal to the hole portion 75. The hole portion 75 has substantially the same diameter as the hole portion 37 of the upper support piece portion 35 of the cylinder block 11 shown in FIG. 4 (a). As shown in FIG. 6, a pressing portion 77 is formed between the hole portion 75 of the base portion 61 of the tie rod 14 and the operation portion 63. The pressing portion 77 is in contact with the power transmitting device 15 shown in FIG. 3 and presses the power transmitting device 15. An engagement portion 76 is formed between the boss portion 72 on the upper side of the main plate portion 71 and the contact portion 74.

The power transmitting device 15 is made of metal. The power transmitting device 15 includes: a base portion 81; and a lower protruding portion 82 protruding downward from one end portion in the length direction of the base portion 81; and an intermediate protruding portion 83 extending from the length direction of the base portion 81. The other end portion projects downward; and the bracket support portion 84 projects from the lower portion of the intermediate projection portion 83 in parallel with the base portion 81.

The base portion 81 includes: a plate-like main plate portion 91 which is mainly composed of the base portion 81; and a circular boss portion 92 which projects downward from the lower surface of the main plate portion 91; and an action portion 93 which Yes, the piston 51 is pressed. A hole portion 94 is formed on the central axis of the boss portion 92 and penetrates the base portion 81 in the thickness direction. The main plate portion 91 has its upper surface 91a shown in (a) in FIG. 7 as a flat surface, and the boss portion 92 has its lower end surface 92a shown in (b) in FIG. 7 as a flat surface. The upper surface 91 a and the lower end surface 92 a are parallel and orthogonal to the hole portion 94. The hole portion 94 has a smaller diameter than the hole portion 75 of the tie rod 14 shown in FIG. 3. The bracket support portion 84 is also formed with a hole portion 95 penetrating in the thickness direction.

The return spring 16 shown in FIG. 2 is made of metal and has a spiral coil portion 101, an engaging portion 102 extending from one end of the coil portion 101, and a hook portion extending from the other end of the coil portion 101. 103.

A tie rod 14 is arranged below the upper support piece portion 35 of the cylinder block 11, a base portion 81 of the power transmitter 15 is arranged below the tie rod 14, and a lower support piece of the cylinder block 11 is arranged below the base portion 81.部 36。 36. In this state, the cylinder block 11 is in a state of straddling the base portion 81 of the tie rod 14 and the force transmitter 15. In this state, the hole portion 37 of the upper support piece portion 35, the hole portion 75 of the tie rod 14, the hole portion 94 of the power transmission device 15, and the hole portion 38 of the lower support piece portion 36 shown in FIG. 3 are continuously arranged. And becomes a through hole 111. In other words, the through-hole 111 passes through the tie rod 14, the power transmission device 15, and the cylinder block 11.

The support shaft 17 and the tie rod 14 are inserted through the inside of the coil portion 101 of the return spring 16 shown in FIG. 2 and the through-hole 111 formed by the hole portions 37, 75, 94, and 38 shown in FIG. 3. And the force transmitter 15 can rotate the cylinder 11 with the support shaft 17 as a center. In other words, the support shaft 17 supports the tie rod 14 and the force transmitter 15 so as to be able to rotate the cylinder 11.

The support shaft 17 is a metal bolt member and has a head portion 121, a large-diameter shaft portion 122 having a smaller diameter than the head portion 121, a middle-diameter shaft portion 123 having a smaller diameter than the large-diameter shaft portion 122, and A screw shaft portion 124 having a smaller diameter than the middle diameter shaft portion 123.

The head 121 has a larger diameter than the inner diameter of the coil portion 101 of the return spring 16 shown in FIG. 2, and sandwiches the coil portion 101 with the upper support piece portion 35. The large-diameter shaft portion 122 shown in FIG. 3 is fitted into the hole portion 37 of the upper support piece portion 35 of the cylinder block 11 and the hole portion 75 of the tie rod 14. The middle-diameter shaft portion 123 is fitted into the hole portion 94 of the force transmitter 15. The threaded shaft portion 124 is projected toward the lower side than the lower support piece portion 36 through the hole portion 38 of the lower support piece portion 36, and a nut 18 shown in FIG. 2 is screwed to this portion. Thereby, the middle-diameter shaft portion 123 and the nut 18 sandwich the lower support piece portion 36 and fix the support shaft 17 to the cylinder block 11.

The return spring 36 held by the head 121 of the support shaft 17 and the support piece 35 on the upper side of the cylinder 11 is inserted into the engaging hole 76 of the tie rod 14 through the engaging portion 102, and the hook portion 103 is hooked on The upper support piece portion 35 pushes the pull rod 14.

As shown in FIG. 1, the master cylinder 2 for a brake is provided when the cylinder block 11 is attached to the steering handle 4 via the clamper 12, and a tie rod 14 is disposed in front of the steering handle 4. In this state, the return spring 16 is biased toward the operation portion 63 away from the steering handle 4, in other words, the lever 14 is moved forward. As shown in FIG. 2, the tie rod 14 is abutted against the cylinder 11 by the abutting portion 74, so that further rotation of the direction in which the operating portion 63 moves forward can be restricted.

The pressing portion 77 between the hole portion 75 and the operation portion 63 of the base portion 61 of the tie rod 14 shown in FIG. 3 is disposed on the front side of the intermediate protruding portion 83 of the force transmitter 15. When the operation portion 63 of the tie rod 14 is pulled rearward, the pressing portion 77 of the tie rod 14 abuts the middle extension portion 83 of the force transmitter 15 and moves the middle extension portion 83 toward the rear. The power transmitting device 15 rotates. In this way, the action portion 93 of the power transmission device 15 pushes the piston 51 shown in FIG. 1, and thereby the brake fluid is supplied from the master cylinder 2 for braking to the front brake device to perform braking. In other words, the force transmitter 15 transmits the operating force to the tie rod 14 to the piston 51.

As shown in FIG. 2, a wire support 131 is rotatably attached to the bracket support portion 84 of the force transmitter 15. The metal wire support 43 described above is engaged with the end portion of the outer cable 136 to which the metal wire 135 is engaged, and the metal wire bracket 131 is engaged with the internal cable of the metal wire 135. The end of 137. Although the illustration is omitted, the metal wire 135 is connected to an equalizer near the steering handle on the left side held by the left hand of the driver, and the left side lever is operated to make the equalizer.器 动。 The device operates. That is, when the left lever is pulled backward, the rear wheel braking device is driven by the equalizer, and the power transmission device 15 is rotated through the metal wire 135 to push the piston 51 and make the master cylinder 2 for braking. Act. In other words, the power transmitting device 15 of the master cylinder 2 for braking constitutes a front and rear wheel interlocking braking system that operates both the rear wheel braking device and the front wheel braking device by the operation of the left lever.

In this embodiment, as shown in FIG. 4A, the supporting piece 35 on the upper side of the cylinder block 11 is formed more concavely than the flat lower surface 35 a of the upper supporting piece 35 as shown in FIG. 4. A ring-shaped annular groove 35A is formed to surround the hole portion 37. The annular groove 35A is provided on the lower side of the upper support piece portion 35, in other words, on the side of the tie rod 14 shown in FIG. 2. As shown in (a) of FIG. 4, the annular groove 35A is arranged coaxially with the central axis thereof aligned with the hole portion 37.

As shown in FIG. 8, the upper support piece portion 35 is formed with a communication groove 35B which is more recessed than the lower surface 35 a to communicate the annular groove 35A and the hole portion 37. As shown in (a) of FIG. 4, the communication groove 35B is provided in the circumferential direction of the annular groove 35A and the hole portion 37 at equal intervals along the radial direction of the annular groove 35A and the hole portion 37. The plurality of communication grooves 35B are provided in a range between the annular groove 35A and the hole portion 37 without being protruded outward in the radial direction than the annular groove 35A. Specifically, the communication groove 35B is provided with four parts. These annular grooves 35A and the plurality of communication grooves 35B are provided between the support piece portion 35 on the upper side of the cylinder block 11 and the boss portion 72 on the upper side of the tie rod 14 shown in FIG. 2 in contact with each other.

As shown in FIG. 5, the boss portion 72 on the upper side of the tie rod 14 is provided with an annular groove 72A which is more concave than the flat upper end surface 72 a. The annular groove 72A is formed in a circle surrounding the hole portion 75. ring. The annular groove 72A is provided on the upper side of the tie rod 14, in other words, on the upper support piece portion 35 side shown in FIG. 2. As shown in FIG. 5, the annular groove 72A is arranged coaxially with the central axis thereof aligned with the hole portion 75.

The upper boss portion 72 is formed with a communication groove 72B which is more concave than the upper end surface 72 a and communicates the annular groove 72A with the hole portion 75. The communication groove 72B is provided in the circumferential direction of the annular groove 72A and the hole portion 75 at equal intervals along the radial direction of the annular groove 72A and the hole portion 75. The plurality of communication grooves 72B are provided in a range between the annular groove 72A and the hole portion 75 instead of projecting radially outward than the annular groove 72A. Specifically, the communication groove 72B is provided with four parts. These annular grooves 72A and the plurality of communication grooves 72B are provided between the upper support piece 35 and the boss portion 72 on the upper side of the cylinder 11 shown in FIG. 2 in contact with each other.

As shown in FIG. 6, an annular groove 73A which is more concave than the flat lower end surface 73 a is provided on the lower boss portion 73 of the tie rod 14. The annular groove 73A is formed to surround the hole portion 75. Toroidal. The annular groove 73A is provided on the lower side of the tie rod 14, in other words, on the side of the force transmitter 15 shown in FIG. 2. The annular groove 73A shown in FIG. 6 is arranged coaxially with the center axis thereof aligned with the hole portion 75. The annular groove 73A has the same diameter as the annular groove 72A shown in FIG. 5, and the central axis thereof coincides with the annular groove 72A.

As shown in FIG. 6, the lower boss portion 73 is formed with a communication groove 73B which is more concave than the lower end surface 73 a and communicates the annular groove 73A with the hole portion 75. The communication groove 73B is provided in the circumferential direction of the annular groove 73A and the hole portion 75 at equal intervals along the radial direction of the annular groove 73A and the hole portion 75. The plurality of communication grooves 73B are provided in a range between the annular groove 73A and the hole portion 75 instead of projecting radially outward than the annular groove 73A. Specifically, the communication groove 73B is provided with four parts. These annular grooves 73A and the plurality of communication grooves 73B are provided between the boss portion 73 on the lower side of the tie rod 14 shown in FIG. 2 and the main plate portion 91 of the force transmitter 15 in contact with each other.

As shown in (a) of FIG. 7, the main plate portion 91 of the force transmitter 15 is provided with an annular groove 91A which is more concave than the flat upper surface 91a, and the annular groove 91A is formed to surround the hole 94 ring shape. The annular groove 91A is provided on the upper side of the force transmitter 15, in other words, on the side of the tie rod 14 shown in FIG. 2. As shown in (a) of FIG. 7, the annular groove 91A is arranged coaxially with the central axis thereof aligned with the hole portion 94. The annular groove 91A has a smaller diameter than the annular grooves 72A and 73A of the tie rod 14 shown in FIGS. 5 and 6.

The main plate portion 91 is formed with a communication groove 91B which is more concave than the upper surface 91 a and communicates the annular groove 91A with the hole portion 94. The communication groove 91B is provided in the circumferential direction of the annular groove 91A and the hole portion 94 at equal intervals along the radial direction of the annular groove 91A and the hole portion 94. The plurality of communication grooves 91B are provided in a range between the annular groove 91A and the hole portion 94 rather than protruding radially outward than the annular groove 91A. Specifically, the communication groove 91B is provided with four parts. These annular grooves 91A and the plurality of communication grooves 91B are provided between the boss portion 73 on the lower side of the tie rod 14 shown in FIG. 2 and the main plate portion 91 of the force transmitter 15 in contact with each other.

As shown in FIG. 7 (b), the convex portion 92 of the power transmission device 15 is provided with an annular groove (power transmission device annular groove) 92A which is more concave than the flat lower end surface 92 a. The groove 92A is formed in a ring shape surrounding the hole portion 94. The annular groove 92A is provided on the lower side of the force transmitter 15, in other words, on the lower support piece portion 36 side shown in FIG. 2. As shown in FIG. 7 (b), the annular groove 92A is arranged coaxially with the central axis thereof aligned with the hole portion 94. The ring-shaped groove 92A has the same diameter as the ring-shaped groove 91A, and the central axis is aligned.

The boss portion 92 is formed with a communication groove 92B which is more concave than the lower end surface 92 a and communicates the annular groove 92A with the hole portion 94. The communication groove 92B is provided in the circumferential direction of the annular groove 92A and the hole portion 94 at equal intervals along the radial direction of the annular groove 92A and the hole portion 94. The plurality of communication grooves 92B are provided in a range between the annular groove 92A and the hole portion 94 rather than protruding radially outward than the annular groove 92A. Specifically, the communication groove 92B is provided with four parts. These annular grooves 92A and the plurality of communication grooves 92B are provided between the boss portion 92 of the power transmitter 15 shown in FIG. 2 and the support piece portion 36 on the lower side of the cylinder 11 in contact with each other.

As shown in FIG. 4 (b), the supporting piece 36 on the lower side of the cylinder block 11 is provided with an annular groove (cylinder annular groove) 36A which is more concave than the flat upper surface 36 a. The groove 36A is formed in an annular shape surrounding the hole portion 38. The annular groove 36A is provided on the upper side of the lower support piece portion 36, in other words, on the base portion 81 side of the force transmitter 15 shown in FIG. 2. As shown in FIG. 4 (b), the annular groove 36A is arranged coaxially with the center axis aligned with the hole portion 38. The annular groove 36A of the lower support piece portion 36 has a larger diameter than the annular grooves 91A and 92A of the power transmitting device 15 shown in FIG. 7.

As shown in FIG. 4 (b), a communication groove 36B is formed in the lower support piece portion 36 so as to be more concave than the upper surface 36 a and communicate the annular groove 36A and the hole portion 38. The communication groove 36B is provided in the circumferential direction of the annular groove 36A and the hole portion 38 at equal intervals along the radial direction of the annular groove 36A and the hole portion 38. The plurality of communication grooves 36B are provided in a range between the annular groove 36A and the hole portion 38 rather than protruding radially outward than the annular groove 36A. Specifically, the communication groove 36B is provided with four parts. These annular grooves 36A and the plurality of communication grooves 36B are provided between the boss portion 92 of the power transmitter 15 shown in FIG. 2 and the support piece portion 36 on the lower side of the cylinder block 11 in contact with each other.

The brake device described in the above-mentioned Patent Document 1 is partially formed as an oil groove in an inner peripheral edge of a through hole through which a shaft of a support rod can be fitted. In such a structure, the outflow of grease cannot be suppressed. In other words, although it is possible to maintain a large amount of grease by providing an oil groove, the grease supplied from the oil groove to the contact surface expands radially outward through the contact surface than the contact surface. Therefore, the grease is easily depleted, and the rotating part is easily worn.

On the other hand, according to this embodiment, an annular groove 35A is provided in the upper support piece portion 35, and an upper boss portion 72 is provided on the upper side of the tie rod 14 where the lower surface 35a of the upper support piece 35 contacts the upper end surface 72a and relatively rotates. Ring groove 72A. Further, an annular groove 73A is provided in the lower boss portion 73 of the tie rod 14, and an annular groove is provided in the main plate portion 91 of the force transmitter 15 which is in contact with the upper surface 91a and rotates relatively at the lower end surface 73a of the lower boss portion 73. 91A. Furthermore, an annular groove 92A is provided in the boss portion 92 of the force transmitter 15, and an annular groove 36A is provided in the lower support piece portion 36 which is in contact with the upper surface 36 a and rotates relatively at the lower end surface 92 a of the boss portion 92.

In this way, the grease can be stored in the annular grooves 35A, 72A, 73A, 91A, 92A, 36A, and the grease can be blocked by the annular grooves 35A, 72A, 73A, 91A, 92A, 36A, thereby preventing slippage. The fat flows out more radially outward than this. Therefore, it is possible to prevent the grease from leaking toward the outside than the contact range of the relatively rotating rotating portion. Accordingly, abrasion of the rotating portion that is relatively rotated by the contact can be suppressed.

In particular, since the annular groove 35A, the annular groove 73A, and the annular groove 92A turned downward in the vertical direction, the grease is caused to flow downward by gravity and supplied to the rotating portion, so that wear can be more effectively suppressed.

In the power transmitting device 15, a load is applied from the bracket support portion 84 on the lower side of the power transmitting device 15 from the metal wire 135 compared to the main board portion 91, whereby the main board portion 91 of the power transmitting device 15 receives the force from below and tightly. The support piece 36 is pressed against the lower side of the cylinder block 11. Therefore, an annular groove 92A is provided in the boss portion 92 of the force transmitter 15, and an annular groove 36A is provided in the lower support piece portion 36 which is in contact with the upper surface 36 a and rotates relatively at the lower end surface 92 a of the boss portion 92. Therefore, it is possible to effectively suppress abrasion that easily occurs in the boss portion 92 and the lower support piece portion 36.

In addition, since the annular groove 36A of the lower support piece portion 36 has a larger diameter than the annular groove 92A of the power transmitting device 15 opposite to this, the annular groove 36A can be used to suppress the passage from the annular groove 92A. The grease that flows downwards by gravity flows outward radially.

Further, a communication groove 35B that communicates the annular groove 35A and the hole portion 37, a communication groove 72B that communicates the annular groove 72A and the hole portion 75, a communication groove 73B that communicates the annular groove 73A and the hole portion 75, The communication groove 91B that communicates the annular groove 91A and the hole portion 94, the communication groove 92B that communicates the annular groove 92A and the hole portion 94, and the communication groove 36B that communicates the annular groove 36A and the hole portion 38 can be passed through. The grease between the hole 111 and the support shaft 17 flows into the annular grooves 35A, 72A, 73A, 91A, 92A, and 36A. Therefore, abrasion of the rotating portion can be more suppressed.

Above, although the communication grooves 35B, 72B, 73B, 91B, 92B, 36B are formed along the radial direction of the through hole 111, any or all of these may be inclined to the through hole 111. Radial. For example, as shown in the modified example shown in (a) of FIG. 9, the communicating grooves 151B that communicate with each other may be inclined to the radial direction of the through hole 111 and the annular groove 151A. With such an inclination, the relative rotation of the rotating portion can be used to guide the grease on the through-hole 111 side to the communication groove 151B and flow to the annular groove 151A. In this case, as shown in (a) of FIG. 9, the plurality of communication grooves 151B may be similarly bent in the circumferential direction to form a spiral shape.

In the above, although four communication grooves 35B, 72B, 73B, 91B, 92B, and 36B are respectively provided, at least one of them may be provided. For example, as in the modified example of (b) in FIG. 9, only two communication grooves 152B may be provided for one annular groove 152A. Furthermore, the communication grooves 35B, 72B, 73B, 91B, 92B, and 36B may not be provided, or all of them may be provided. In other words, as in the modified example shown in (c) of FIG. 9, it is not necessary to provide a communication groove for communicating with each other between the through hole 111 and the annular groove 153A.

In addition, instead of providing the communication groove 35B, a concave portion which is shallower than the annular groove 35A from the lower surface 35a may be provided in the entirety between the annular groove 35A and the hole portion 37. Similarly, instead of providing the communication groove 72B, a concave portion shallower than the annular groove 72A from the upper end surface 72a may be provided in the entirety between the annular groove 72A and the hole portion 75. Similarly, instead of providing the communication groove 73B, a concave portion which is shallower than the annular groove 73A from the lower end surface 73a may be provided in the entirety between the annular groove 73A and the hole portion 75. Similarly, instead of providing the communication groove 91B, the entire groove between the annular groove 91A and the hole portion 94 may be provided with a concave portion that is shallower than the annular groove 91A from the upper surface 91a. Similarly, instead of providing the communication groove 92B, a concave portion shallower than the annular groove 92A from the lower end surface 92a may be provided in the entirety between the annular groove 92A and the hole portion 94. Similarly, instead of providing the communication groove 36B, a concave portion which is shallower than the annular groove 36A from the upper surface 36a may be provided in the entirety between the annular groove 36A and the hole portion 38. In other words, as shown in the modified example shown in FIG. 10, the entire recessed portion 155 that is shallower than the annular groove 154A is provided between the through hole 111 and the annular groove 154A.

In the above-mentioned embodiment, although the annular groove 35A and the communication groove 35B are provided in the upper support piece portion 35, the annular groove 72A and the communication groove 72B are provided on the boss portion 72 on the upper side of the rod 14 opposite to this. However, it is also possible to provide the annular groove and the communication groove only on either of these sides. In other words, an annular groove surrounding the through hole 111 and a communication groove communicating the annular groove and the through hole 111 may be provided between the support piece 35 and the tie rod 14 on the upper side of the cylinder 11.

Further, although the annular groove 73A and the communication groove 73B are provided on the lower boss portion 73 of the tie rod 14, and the main plate portion 91 of the power transmitting device 15 facing the annular groove 91A and the communication groove 91B are provided, However, the annular groove and the communication groove may be provided only on any of these sides. In other words, an annular groove surrounding the through-hole 111 and a communication groove communicating the annular groove and the through-hole 111 may be provided between the tie rod 14 and the force transmitter 15.

Moreover, although the annular groove 92A and the communication groove 92B are provided in the boss portion 92 of the power transmission device 15, the annular groove 36A and the communication groove are provided in the supporting piece portion 36 on the lower side of the cylinder 11 opposite to this. 36B, but the annular groove and the communication groove may be provided only on any of these sides. In other words, as long as the position between the force transmitter 15 and the support piece portion 36 on the lower side of the cylinder block 11 is provided with an annular groove surrounding the through hole 111 and a communication groove communicating the annular groove and the through hole 111 Just fine.

Moreover, the position between the upper support piece 35 and the tie rod 14 of the cylinder block 11, the position between the tie rod 14 and the force transfer device 15, and the lower support piece 36 of the force transfer device 15 and the cylinder 11 may be provided. At any one of the three positions in between, an annular groove surrounding the through-hole 111 and a communication groove communicating the annular groove and the through-hole 111 are provided. Alternatively, only the position between the upper support piece 35 and the tie rod 14 of the cylinder 11, the position between the tie rod 14 and the force transmitter 15, and the lower support piece 36 of the force transmitter 15 and the cylinder 11 may be used. An annular groove surrounding the through-hole 111 and a communication groove that communicates the annular groove and the through-hole 111 are provided in any two of the three positions in the intermediate positions. In other words, as long as the position between the upper support piece 35 and the tie rod 14 of the cylinder block 11, the position between the tie rod 14 and the force transmitter 15, and the position between the force support 15 and the lower support piece 36 of the cylinder 11 At least one of the three positions in the intermediate position may be provided with an annular groove surrounding the through hole 111 and a communication groove communicating the annular groove and the through hole 111.

Here, in particular, the wear suppressing effect is high between the position provided between the tie rod 14 and the power transmission device 15 and the position between the power transmission device 15 and the lower support piece portion 36 of the cylinder block 11. In this case, it is effective that an annular groove 73A and a communication groove 73B are provided on the boss portion 73 below the tie rod 14, and an annular groove 91A and a communication groove are provided on the main plate portion 91 of the power transmitting device 15 facing the same. 91B, an annular groove 92A and a communication groove 92B are provided in the boss portion 92 of the force transmitter 15.

The above embodiments include: a tie rod, which is arranged in front of the steering handle; and a force transmitter, which transmits the operating force to the tie rod to the piston; and a cylinder, which is across the tie rod and the foregoing The power transmission device is configured and accommodates the piston; and a support shaft that is inserted into a through hole penetrating the pull rod, the power transmission device, and the cylinder, and rotatably supports the rod and the power transmission device. At the position of at least any one of the position between the cylinder and the tie rod, the position between the lever and the power transmitter, and the position between at least one of the position between the force transmitter and the cylinder, An annular groove surrounding the aforementioned through hole. Accordingly, since the grease can be stored in the annular groove, and the grease can be prevented from flowing out radially outward by the annular groove, it is possible to suppress abrasion of the rotating portion that is relatively rotated by the contact.

In addition, since the annular groove is provided between the power transmitting device and the cylinder, when the power transmitting device is tightly pressed against the cylinder, it is possible to suppress abrasion that easily occurs therebetween.

The annular groove is a circular groove of the power transmitter provided on the cylinder side of the power transmitter and a circular groove of the cylinder provided on the power transmitter side of the cylinder. The diameter of the annular groove is larger than the diameter of the annular groove of the power transmission device. Therefore, by using the annular groove of the cylinder block, it is possible to prevent the grease from flowing out radially outward.

In addition, since a communication groove that communicates the annular groove and the through hole is provided, the grease between the through hole and the support shaft can flow into the annular groove. Therefore, abrasion of the rotating portion can be more suppressed.

In addition, since the communication groove is inclined to the radial direction of the through hole, the rotation of the rotating portion can be used to cause the grease to flow to the annular groove.

1‧‧‧ storage tank

2‧‧‧Brake master cylinder

3‧‧‧ Steering lever

4‧‧‧ steering handle

11‧‧‧cylinder block

12‧‧‧ Grip

13‧‧‧ Cover

14‧‧‧Trolley

15‧‧‧Power Transmitter

16‧‧‧Return spring

17‧‧‧ support shaft

18‧‧‧nut

31‧‧‧ protrusion

32‧‧‧ Fastening connecting member

35‧‧‧Upper support piece

35A, 36A, 72A, 73A, 91A, 92A, 151A, 152A, 153A, 154A

35B, 36B, 72B, 73B, 91B, 92B, 151B, 152B‧‧‧ communication slot

35a‧‧‧ lower surface

36‧‧‧ underside support piece

36a, 91a‧‧‧ Top surface

37, 38, 75, 94, 95‧‧‧ holes

41‧‧‧Lens Mounting Section

42‧‧‧Screw member

43‧‧‧ metal wire rod

44‧‧‧Mount

50‧‧‧pressure cylinder

51‧‧‧Piston

52‧‧‧Wall of the tank

53‧‧‧window

54‧‧‧Window components

61, 81‧‧‧ base

62‧‧‧ Supported

63‧‧‧Operation Department

71, 91‧‧‧ Main Board Department

72‧‧‧Upper boss

72a‧‧‧upper face

73‧‧‧ lower side boss

73a, 92a ‧‧‧ bottom face

74‧‧‧ abutment department

76, 102‧‧‧ engagement holes

77‧‧‧Pressing section

81‧‧‧ base

82‧‧‧ Bottom protrusion

83‧‧‧ middle extension

84‧‧‧ bracket support

92‧‧‧ Boss

93‧‧‧Action

101‧‧‧Coil Department

103‧‧‧ Hook

111‧‧‧through hole

121‧‧‧ Head

122‧‧‧Large diameter shaft

123‧‧‧Middle diameter shaft

124‧‧‧Threaded shaft

131‧‧‧Wire bracket

135‧‧‧metal wire

136‧‧‧External cable

137‧‧‧ Internal cable

155‧‧‧ concave

FIG. 1 is a plan view showing an embodiment of the present invention. Fig. 2 is a front view showing an embodiment of the present invention. FIG. 3 is an exploded front view showing the main parts of one embodiment of the present invention. FIG. 4 shows a cylinder block according to an embodiment of the present invention, wherein (a) is a bottom view of the upper support piece portion, and (b) is a plan view of the lower support piece portion. FIG. 5 is a plan view showing a tie rod according to an embodiment of the present invention. FIG. 6 is a bottom view of a tie rod according to an embodiment of the present invention. FIG. 7 shows a power transmission device according to an embodiment of the present invention, in which (a) is a top view and (b) is a bottom view. 8 is a cross-sectional view of an upper support piece portion according to an embodiment of the present invention. 9 is a modification example of the annular groove and the communication groove according to an embodiment of the present invention. FIG. 10 is a modification example of one embodiment of the present invention.

Claims (5)

A master cylinder for a brake is provided with: a tie rod, which is arranged in front of a steering handle; and a force transmitter, which transmits an operating force to the tie rod to a piston; and a cylinder body, which is straddled The tie rod and the power transmission device are configured and accommodate the piston; and a support shaft is inserted into a through hole penetrating the tie rod, the power transmission device, and the cylinder body, and the rod and the power transmission device are inserted. Rotatably supported by the cylinder; between at least any one of a position between the cylinder and the tie rod, a position between the tie rod and the power transmitter, and a position between the force transmitter and the cylinder An end surface of at least one of the positions is provided with an annular groove surrounding the through hole. For example, the master cylinder for brakes in the scope of patent application, wherein the annular groove is provided between the power transmitter and the cylinder. For example, the master cylinder for brakes in the second scope of the patent application, wherein the annular groove is the annular groove of the power transmitter provided on the cylinder side of the power transmitter and the force transmission provided on the cylinder body. The annular groove of the cylinder on the device side has a diameter larger than that of the annular groove of the power transmitting device. The brake master cylinder according to any one of claims 1 to 3 of the patent application scope, wherein a communication groove is provided to communicate the annular groove and the through hole. For example, the master cylinder for a brake according to item 4 of the application, wherein the communication groove is inclined in a radial direction of the through hole.