JP2011027183A - Device having motion member sealing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To thin the thickness of a motion member housing coincident with the direction of reciprocation of a motion member or shorten the length of the motion member housing by thinning the thickness of a dust seal for sealing the motion member, to reduce the weight and the size to make a device compact. <P>SOLUTION: The device includes: the housing 9 having a circular opening 32 and provided with an opening internal space 34 connected with a columnar main internal space 33; the motion member 5 received in the internal spaces 33, 34 of the housing 9 and reciprocating while partially projecting outside through the circular opening 32; and the dust seal 43 having a central hole for inserting the motion member 5 and having an outer periphery fitted to a support space portion 37 provided on an outer periphery of the opening internal space 34. The inner diameter of the opening 32 is set larger than the inner diameter of the main internal space 33, the opening internal space 34 is formed in a truncated cone shape by gradually increasing the inner diameter of the opening internal space 34 as advancing to the depth side, and the axes 36 of the opening internal space 34 and the main internal space 33 are agreed with each other. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a sealing structure for a reciprocating member such as a piston and a piston rod used in a cylinder part such as a caliper body of a disc brake, an air cylinder, or a hydraulic cylinder mounted on a four-wheeled vehicle or other vehicles.

  Conventionally, a disc brake is mounted on a vehicle so that a caliper body, which is a main component thereof, straddles a part of an outer peripheral surface of a disc rotor that rotates integrally with a wheel. In use, the friction pads disposed on both sides of the disk rotor are respectively pushed by the hydraulic operation of the pistons provided in each of the plurality of cylinder portions provided in the respective half-body portions of the caliper body. The pad is pressed against both sides of the disc rotor, and braking action is performed by both frictional forces.

  Each cylinder part of both the caliper half parts has a circular opening and a cylinder hole having an internal space communicating with the circular opening so that the axial direction is aligned with the thickness direction of the caliper half part. The piston accommodated in each cylinder hole is a cylindrical body with one end closed, and a part of the open end side protrudes outside through a circular opening, and the back side from the closed end of the piston The internal space located at is a hydraulic chamber. The piston can be reciprocated along the cylinder hole by adjusting the pressure of the oil injected into the hydraulic chamber. For this reason, it is necessary to operate the piston smoothly, and the cylinder hole has a sealed structure. Therefore, normally, two circular ring-shaped grooves are provided on the inner peripheral surface of the cylinder hole in parallel with the circular opening surface, in the vicinity of the circular opening and inward thereof, and separated from each other. And a circular ring-shaped piston seal is fitted into the latter groove. At that time, for example, when the outer diameter of the piston is 25 mm, a dust seal fitting groove having a width of 2.5 mm is provided on the inner peripheral wall of the cylinder hole 2 mm away from the circular opening, and 2.5 mm away from the dust seal fitting groove. A 4 mm wide piston seal fitting groove is provided. Then, it is possible to prevent the entry of dust, earth and sand from the outside by the action of the dust seal, and the piston can be supported and smoothly operated by the action of the piston seal.

However, such a dust seal fitting groove is not necessarily provided inwardly of the circular opening of the cylinder hole. For example, the inner diameter of the circular opening is made larger than the inner diameter of the cylindrical main internal space communicating with the circular opening and provided with the piston seal fitting groove, and in the vicinity of the circular opening, the same as the circular opening. It is also possible to provide an internal opening space that connects the circular opening and the cylindrical main internal space with an inner diameter, and a dust seal can be fitted into the internal opening space. However, in that case, as a dust seal, it has a circular ring plate-shaped seal body having a central hole and a central hole corresponding to the central hole, and covers one main surface and outer peripheral surface of the circular ring plate-shaped seal body. Combined with a disk-shaped metal cover (retainer) made of a plate, the outer diameter of the disk-shaped metal cover is slightly larger, for example, 0.05 mm than the inner diameter of the circular opening, and the outer diameter of the seal body is mainly It should be larger than the inner diameter of the internal space. Then, by first pressing the metal cover through the circular opening from the outside, driving it into the internal space of the opening by applying a pressing force, and inserting the seal body into the metal cover later, A dust seal can be attached to the internal space of the opening. Alternatively, the dust seal can be attached to the internal space of the opening in one step by overlapping the metal cover and the seal body and driving into the internal space of the opening.
JP 2000-283190 A JP2008-180363

  However, the opening internal space of such a cylinder hole has the same uniform inner diameter as the circular opening at any position in the depth direction from the circular opening toward the main internal space. For this reason, in order to prevent the circular ring plate-shaped dust seal from coming out of the disk-shaped opening internal space, both the seal body and the metal sheath are made thicker, and the dust seal is made thicker. The internal space of the opening in which part or all of the dust seal is fitted must be deepened. This is because the outer periphery of the metal sheath is fixed to the inner periphery of the opening inner space by the repulsive force of the metal sheath and the seal body that is press-fitted into the inner space of the opening. This is because when the opening internal space is made shallow, the fixing force becomes small. Therefore, when the piston is 25 mm, the depth of the opening internal space is at least 5 to 6 mm. Therefore, it is difficult to make the disc brake compact because the thickness of the dust seal and the caliper half is thin, making it difficult to reduce the weight and size.

  The present invention has been made paying attention to such a conventional problem, and by reducing the thickness of the dust seal that seals the motion member, the motion member storage body that matches the reciprocating direction of the motion member is provided. It is an object of the present invention to provide an apparatus having a moving member sealing structure that is reduced in thickness, weight, size, and size by reducing the thickness of the moving member storage body.

  In order to achieve the above object, an apparatus having a moving member sealing structure according to the present invention includes a storage body having a circular opening and an opening internal space connected to a columnar main internal space, and the interior of the storage body. A circular ring shape that is housed in a space, part of which protrudes to the outside through a circular opening, has a reciprocating motion member, a central hole through which the motion member is inserted, and an outer peripheral portion provided in the outer peripheral portion of the opening internal space The apparatus has a moving member sealing structure including a circular ring-shaped dust seal fitted in the supporting space. Then, the inner diameter of the circular opening is made larger than the inner diameter of the cylindrical main inner space, and the inner diameter of the opening inner space is gradually increased toward the inner side to form the opening inner space in a truncated cone shape. The axes of the trapezoidal opening internal space and the cylindrical main internal space are made to coincide.

  Further, as the dust seal, a circular ring plate-shaped seal body having a central hole, a central hole corresponding to the central hole, and a plate body covering one main surface and outer peripheral surface of the circular ring plate-shaped seal body. The outer diameter of the seal body is larger than the inner diameter of the cylindrical main inner space, and the outer diameter of the metal cladding is made equal to or smaller than the inner diameter of the circular opening. Use. Then, the metal cover is directed to the outside, the seal body is overlapped so as to fit in the internal space of the metal cover, the dust seal is inserted into the internal space of the truncated cone opening, and the dust seal is passed through the circular opening from the outside. Applying a pressing force, the outer periphery surrounding the seal body of the metal cover is deformed so that the outer diameter increases toward the back side, and the outer periphery of the metal cover becomes the outer periphery of the internal space of the frustoconical opening. It is preferable to fit in a circular ring-shaped support space provided in the portion.

  In the apparatus having the moving member sealing structure according to the present invention, the inner diameter of the circular opening is made larger than the inner diameter of the cylindrical main inner space, and the inner diameter of the opening inner space is gradually increased toward the inner side to make the opening inner space larger. A circular ring-shaped support space portion provided on the outer peripheral portion of the frustoconical opening inner space is formed by forming a truncated cone shape and aligning the axes of the frustoconical opening inner space and the cylindrical main inner space. The inner circumferential surface of the frustoconical opening inner space and the circular ring-shaped step surface whose inner diameter is equal to the inner diameter of the cylindrical main inner space and whose outer diameter is larger than the inner diameter of the circular opening, The bag becomes wider as it goes to the side.

  Therefore, a circular ring plate made of a material having a relatively high elasticity such as rubber, plastic, leather, etc. and having an outer diameter slightly larger than the inner diameter of the circular opening is used as the dust seal. Then, using the elastic deformation of the dust seal, when the circular seal is pushed into the internal space of the frustoconical opening, the outer periphery of the dust seal is shaped like a bag in the outer periphery of the internal space of the frustoconical opening. It can be fitted into the support space. In addition, the inclined inner peripheral surface of the frustoconical opening inner space serves as a retaining barrier against the outer periphery of the dust seal, and the holding force for the dust seal by the frustoconical opening inner space can be increased. Therefore, the dust seal is thin, the internal space of the frustoconical opening is easily shallow, and the thickness of the motion member storage body corresponding to the reciprocating direction of the motion member is reduced or the length of the motion member storage body is shortened. Therefore, it is easy to reduce the weight and size, and the apparatus having the moving member sealing structure can be made compact.

  Also, as a dust seal, it consists of a circular ring plate-shaped seal body having a central hole and a plate body having a central hole corresponding to the central hole and covering one main surface and outer peripheral surface of the circular ring plate-shaped seal body. Combined with a disk-shaped metal cover, the outer diameter of the seal body is made larger than the inner diameter of the cylindrical main inner space, and the outer diameter of the metal cover is made equal to or smaller than the inner diameter of the circular opening. Thus, the dust seal can be easily brought into contact with the stepped surface by inserting the dust seal into the frustoconical opening inside space and placing the outer periphery of the dust seal on the circular ring-shaped stepped surface. Therefore, the metal cover is directed outward, the seal body is overlapped so that it fits in the internal space of the metal cover, and the dust seal is inserted into the internal space of the frustoconical opening. Apply pressing force.

  Then, the inclined inner peripheral surface of the internal space of the frustoconical opening becomes a molding surface when the outer peripheral portion of the metal cover is deformed, and the outer diameter of the metal cover increases as the outer diameter goes to the back side. It can be easily spread and plastically deformed. And the outer peripheral part of a metal coating body can be firmly fitted in the bag-shaped circular ring-shaped support space part in the outer peripheral part of frustoconical opening internal space. In addition, when a disc-shaped metal cover and a circular ring plate-shaped seal body are used as a dust seal, the seal body can be reinforced by the metal cover. Naturally, it becomes easy to use various materials for the seal body. Therefore, the thickness of both the plate body and the seal body constituting the metal cover can be reduced, the dust seal can be made thinner, and the internal space of the frustoconical opening can be made shallower.

Hereinafter, the best mode of the present invention will be described with reference to FIGS.
FIG. 1 is a longitudinal sectional view showing a piston sealing structure of one cylinder portion provided in a piston-opposed split type caliper body of a four-wheeled vehicle disc brake to which the present invention is applied, and FIG. 2 is an embodiment of the four-wheeled vehicle disc brake. FIG. 3 is a sectional view taken along line AA of the disc brake for a four-wheel vehicle. The disc brake 1 for a four-wheel vehicle has a disc rotor 2, a piston-opposed split caliper body 3 that sandwiches the disc rotor 2 across a part of the outer periphery of the disc rotor 2, and a braking action between them. Each of the friction pads 4 is operated by a plurality of sets, for example, three sets of opposed pistons 5 (5a, 5b) installed on the split caliper body 3. Then, in order to make the caliper body 3 into a split type, the caliper body 3 is divided into two equal parts at a bridge portion 7 (7a, 7b) with a central opening 6 (6a, 6b) straddling a part of the outer peripheral surface of the disk rotor 2. Then, the caliper half 9a that pushes the friction pad 4a with the base plate 8a disposed on one side of both sides of the disk rotor 2 and the caliper that pushes the friction pad 4b with the base plate 8b disposed on the other side. The half body 9b can be manufactured separately, for example, by hot forging. If the central opening 6 is provided in the bridge portion 7 in this manner, the friction pads 4 with the base plates 8 accommodated therein can be replaced while the caliper body 3 is mounted on the vehicle body. However, the dividing position of the bridge portion 7 does not necessarily have to be in the center, and may be shifted to one side. Reference numerals 10 (10a, 10b) are hydraulic chambers for applying hydraulic pressure to the piston 5, and 11 (11a, 11b) are liquid injection holes.

  Such a caliper half body 9a is disposed so as to fit in the accommodation space inside the wheel, and the caliper half body 9b is disposed below the vehicle body. Then, the caliper half body 9a is installed on the outside, while the caliper half body 9b is installed on the inside. Therefore, at the time of manufacture, the caliper half 9a is formed in a generally arcuate plate shape as shown in FIG. 4, and the caliper half 9b is formed in an arcuate plate shape having substantially the same shape as shown in FIG. Further, the caliper halves 9a and 9b have a generally symmetrical structure. The center of each arc of both caliper halves 9a and 98b is the shaft 12 of the disk rotor 2.

  A caliper half 9a for outer installation is provided with a through hole 14 for screwing a positioning bolt 13 in the center of the arc-shaped peripheral edge of the disk rotor 2 to prevent rattling of both friction pads 4. 12 is provided in a direction parallel to 12. Moreover, the edge part side opposite to the circular-arc-shaped peripheral part of the caliper half body 9a is wide, and it protrudes outside, and the center protrusion part 15 is formed. Furthermore, three cylinder parts each having cylinder holes 16 (16a, 16b, 16c) are dispersedly arranged inside the central projecting part 15, and both ends of the oil flow path connecting all the cylinder holes 16 are connected to the central projecting part 15 To the opening of each cylindrical end (not shown) provided on the outer surface of both ends.

  The joint surfaces 18 (18a, 18b) of the caliper half 9a are inner arc-shaped peripheral portions on both sides of the central opening 6a of the bridge portion 7a, both of which have a constant width, The disk rotor 2 is on the rotation inlet side (exit side) and the other is on the rotation outlet side (inlet side). In addition, through holes 19 (19a,... 19d) for screwing connection bolts (not shown) are connected near both ends of each joint surface 18 to connect both caliper halves 9 to the shaft 12 of the disk rotor 2. Are provided so as to penetrate in parallel to each other. In addition, 20 (20a, 20b) is a support installation hole for supporting the friction pad 4 with each base plate 8, respectively.

  The caliper half 9b for inner installation is provided with a through hole 21 for screwing the positioning bolt 13 in the center of the arc-shaped peripheral edge. Further, a through hole 22 for injecting hydraulic fluid, for example oil, from the outside is provided at the center of the caliper half 9b, and the edge opposite to the arcuate peripheral edge is widened with the oil injection hole 22 at the center, The central projection 23 is formed by projecting to the center. Then, three cylinder parts having cylinder holes 24 (24a, 24b, 24c) are dispersedly arranged inside the central projecting part 23, and both ends of the oil flow path connecting all the cylinder holes 24 are connected to the central projecting part 23. It guide | induces to the opening of each cylindrical edge part (not shown) provided in both ends.

  The joint surfaces 26 (26a, 26b) of the caliper half 9b are inner arc-shaped peripheral portions on both sides of the central opening 6b of the bridge portion 7b, both of which have a constant width, The disk rotor 2 is on the rotation inlet side (exit side) and the other is on the rotation outlet side (inlet side). Then, bolt receiving holes 27 (27a,..., 27d) for screwing connection bolts (not shown) are retracted in the direction parallel to the shaft 12 of the disk rotor 2 in the vicinity of both ends of each joint surface 26, respectively. Provide. 28 (28a, 28b) are friction pad support installation holes, and 29 (29a, 29b) are installation holes for attaching the disc brake 1 to the lower side of the vehicle body.

  As described above, the two caliper halves 9 are provided with the cylinder portions having the cylinder holes 16 and 24 for each half, and in each cylinder portion, the pistons accommodated in the cylinder holes 16 and 24 are provided. 5 should be able to smoothly perform reciprocation of each of them, and prevent dust and earth from entering the cylinder holes 16 and 24 from the outside. Therefore, as shown in FIG. 6, the cylinder portion 30 of the caliper half 9 has a circular opening 32 opened to the inner surface 31, and an opening internal space 34 connected to the columnar main internal space 33 is provided. The inner diameter of the shape opening 32 is made larger than the inner diameter of the cylindrical main inner space 33, and the inner diameter of the opening inner space 34 is gradually increased toward the inner side to form the opening inner space 34 in a truncated cone shape. Further, a disk-shaped central internal space 35 is provided in the central portion of the cylindrical main internal space 33 near the circular opening 32, and the inner diameter of the disk-shaped central internal space 35 is larger than the internal diameter of the cylindrical main internal space 33. To do. Then, the shafts 36 of the columnar main internal space 33, the truncated conical opening internal space 34, and the disc-shaped central internal space 35 are made to coincide.

  Thus, when the frustoconical opening internal space 34 is formed, a circular ring-shaped support space portion 37 formed on the outer peripheral portion of the opening internal space 34 is formed with the inner peripheral surface 38 of the frustoconical opening inner space 34. The inner diameter is equal to the inner diameter of the cylindrical main internal space 33 and the outer diameter is partitioned by a circular ring-shaped stepped surface 39 larger than the inner diameter of the circular opening 32, and the bag becomes wider toward the back. . Therefore, first, as a piston seal 40 having a central hole through which the piston 5 is inserted, for example, a rubber O-ring is used, and the O-ring is pushed into the disk-shaped central inner space 35. Then, the piston seal 40 can be fitted into the circular ring-shaped support space 41 that surrounds the piston 5 on the outer periphery of the disk-shaped central inner space 35. Next, as a dust seal 43 having a central hole 42 through which the piston 5 is inserted, for example, a rubber circular ring plate-shaped seal body 44 having a central hole 42 as shown in FIGS. A circular ring plate seal body 44 having a central hole 45 and a disc-shaped metal cover 46 made of, for example, a brass plate that covers the outer peripheral surface of the circular ring plate seal body 44, The diameter is made larger than the inner diameter of the cylindrical main inner space 33, and the outer diameter of the metal cover 46 is made equal to or slightly smaller than the inner diameter of the circular opening 32. The central hole 42 of the seal body 44 becomes the central hole 42 of the dust seal 43.

  At this time, when a piston 5 having an outer diameter of, for example, 25 mm is used, the inner diameter of the main inner space 33 is 25.38 mm, the inner diameter of the opening 32 is 35 mm, and the innermost inner diameter of the opening inner space 34 is 35.09 mm. The outer diameter of the seal body 44 is 34.8 mm, the thickness is 2.0 mm, the inner diameter of the central hole 42 is 25 mm, the outer diameter of the metal cover 46 is 35 mm, the plate thickness is 0.1 mm, and the height is 2 1 mm, the inner diameter of the central hole 45 is 26 mm. The metal cover 46 may be made of stainless steel, steel, or other metals.

  When such a dust seal 43 is installed in the frustoconical opening inner space 34, first, as shown in FIG. 9, the seal body 44 is overlapped so that it fits in the inner space of the metal cover 46, and then the dust seal 43. Is moved in the direction of the arrow toward the opening internal space 34. Then, as shown in FIG. 10, the metal covering 46 is directed outward, and the dust seal 43 is simply inserted into the frustoconical opening inner space 34 from the circular opening 32, and the outer periphery of the dust seal 43 is formed into a circular ring shape. By placing it on the step surface 39, the step surface 39 can be contacted. Then, the inner peripheral surface 38 of the opening internal space 34 is inclined at an angle α with respect to the outer surface of the outer peripheral portion 47 of the metal cover 46. Since α corresponds to the inclination angle between the shaft 36 and the inner peripheral surface 38 of the opening internal space 34, α can be selected in the range of 1 to 45 degrees, but 5 degrees is preferable.

  Therefore, a pressing force is applied to the dust seal 43 from the outside through the circular opening 32. Then, the inner peripheral surface 38 of the frustoconical opening inner space 34 becomes a molding surface when the outer peripheral portion 47 of the metal cover 46 is deformed. Since the seal body 43 is compressed by the pressing force and deformed so that the outer diameter becomes larger, the deformation force acts on the outer peripheral portion 47 of the metal cover 46 as a pressing force from the inside. Moreover, since the metal cover 46 is usually formed by pressing a flat plate, the outer peripheral portion 47 of the metal cover 46 tends to return to the original flat state. Therefore, the outer diameter of the outer peripheral portion 47 of the metal cover 46 can be easily expanded and plastically deformed so as to increase toward the far side. If a material having a relatively large elastic force such as rubber, plastic, leather or the like is used for the seal body 44, the seal body 44 returns to the original state to some extent even if it is deformed once. Then, as shown in FIGS. 11 and 12, the outer peripheral portion 47 of the metal cover 46 can be firmly fitted into the bag-like circular ring-shaped supporting space portion 37 in the outermost peripheral portion of the columnar main inner space 34. . The inner peripheral surface 38 of the frustoconical opening inner space 34 serves as a retaining barrier against the outer peripheral portion 47 of the metal cover 46, and the holding force for the dust seal 43 by the frustoconical opening inner space 34 can be increased.

  In addition, when the disc-shaped metal cover 46 and the circular ring plate-shaped seal body 44 are used as the dust seal 43 in this manner, the seal body 44 can be reinforced by the metal cover 46. Naturally, it becomes easy to use various materials for the ring plate-shaped seal body 44. Therefore, it is possible to reduce both the thickness of the plate body and the seal main body 44 constituting the metal cover 46, the thickness of the dust seal 43, and the depth of the frustoconical inner space 34. Therefore, as shown in FIGS. 1 and 13, the piston 5 is accommodated in internal spaces 33, 34, and 35 that are cylinder holes provided in the cylinder portion 30. Then, a part of the piston 5 can be protruded to the outside through the circular opening 32 and can be reciprocated in a direction parallel to the shaft 12 of the disk rotor 2.

  When the caliper body 3 is assembled using both the caliper halves 9 as described above, the joint surfaces 18 and 26 of both the caliper halves 9 are brought into contact with each other and are coupled using four connecting bolts. Then, the coupling structure that is the basis of the caliper body 3 is completed. Since the dust seal 43 can be fitted into the inside of the frustoconical opening inner space 34 after the basic structure of the caliper body 3 is completed, the dust seal 43 can be easily replaced and is convenient.

  Therefore, the basic structure of the caliper body 3 is used and attached to the lower side of the vehicle body so as to straddle a part of the outer peripheral surface of the disc rotor 2, and the friction pads are placed at predetermined positions of the caliper halves 9 on both sides of the disc rotor 2. After mounting 4 etc., both caliper halves 9 are further coupled using positioning bolts 13 for preventing rattling of the friction pads 4. Then, at the same time as the caliper body 3 is completed, the disc brake 1 is completed and can be mounted on the vehicle body. Thus, when the dust seal 43 is thin and the frustoconical opening internal space 34 is shallow, the thickness of the caliper half 9 that matches the reciprocating direction of the piston 5 is reduced, and it becomes easy to reduce weight and size. The disc brake 1 can be made compact.

  In the above-described embodiment, the case where the dust seal 43 in which the metal cover 46 and the seal body 44 are overlapped is described. However, as the dust seal, the rubber, plastic, A relatively elastic material such as leather can be used, and a circular ring plate-like body having an outer diameter slightly larger than the inner diameter of the circular opening 32 can also be used. At that time, by utilizing the elastic deformation of the dust seal, the outer periphery of the dust seal is pushed into the frustoconical opening inner space 34 from the circular opening 32, so that the bag located on the outer periphery of the frustoconical opening inner space 34 The ring-shaped support space 37 can be fitted into a ring shape.

  In the above embodiment, the case where the present invention is applied to the disc brake 1 having a piston sealing structure has been described. However, the present invention is applied to a sealing structure for a hydraulic cylinder, an air cylinder, and other moving members as shown in FIG. The present invention can also be applied to a device having the above. In the figure, 50 is a cylinder, 51 is a cylinder with one end closed, 52 (52a, 52b) is an oil or air port, 53 is a lid, 54 is a piston, 55 is a piston seal, 56 is a rod, and 57 is a circular opening. , 58 is a frustoconical opening internal space, 59 is a cylindrical main internal space, 60 is a disk-shaped central internal space, 61 is a dust seal, and 62 is a rod seal. When the cylinder 50 is configured in this way, for example, the dust seal 61 composed of the circular ring plate-shaped seal body 63 and the disk-shaped metal cover 64 can be thinned, the frustoconical opening inner space 58 can be shallowed, and the lid 53 can be thinned. . Therefore, the length of the cylindrical body 54 with the lid 53 that coincides with the reciprocating direction of the piston 54 with the rod 56 is shortened, and the cylinder 50 can be made compact.

It is a longitudinal cross-sectional view which shows the piston sealing structure of 1 cylinder part provided in the piston opposing split type caliper body of the disc brake for four-wheeled vehicles to which this invention is applied. It is a top view which shows one Embodiment of the disc brake for the four-wheeled motor vehicles. It is an AA longitudinal cross-sectional view of the disc brake for the four-wheel automobile. It is an inner surface figure of the caliper half for outer sides which constitutes the piston opposed division type caliper body. It is an inner surface figure of the caliper half for inner sides which constitutes the piston opposed division type caliper body.

It is a longitudinal cross-sectional view which shows the structure of the internal space which is a cylinder hole of the same 1 cylinder part. It is a top view which shows one Embodiment of the dust seal installed in the frustoconical opening internal space of the 1 cylinder part. It is a longitudinal cross-sectional view of the dust seal. It is a longitudinal cross-sectional view of the principal part which shows the correspondence just before fitting the dust seal in frustoconical opening internal space. It is a longitudinal cross-sectional view of the principal part which shows the corresponding relationship when the dust seal is fitted in the frustoconical opening internal space. It is a longitudinal cross-sectional view of the principal part which shows a corresponding relationship when the dust seal is fitted to the internal space of the truncated cone opening.

It is a longitudinal cross-sectional view which shows the state which fitted the piston seal and the dust seal in the predetermined space of the cylinder hole of the 1 cylinder part. It is a top view of the 1 cylinder part. It is a longitudinal cross-sectional view of a hydraulic cylinder or an air cylinder.

  DESCRIPTION OF SYMBOLS 1 ... Disc brake 2 ... Disc rotor 3 ... Caliper body 4 ... Friction pad 5, 54 ... Piston 6 ... Center part opening 7 ... Bridge part 9 ... Caliper half body 10 ... Hydraulic chamber 15, 23 ... Center protrusion 30 ... Cylinder Part 31 ... Inner surface 32, 58 ... Circular opening 33, 59 ... Columnar main inner space 34, 58 ... Frustum opening inner space 35, 60 ... Disk-like central inner space 36 ... Shaft 37, 41 ... Circular ring shape Support space 38 ... Inner peripheral surface 39 of the frustoconical opening inner space 34 ... Circular ring-shaped stepped surface 40, 55 ... Piston seal 42, 45 ... Central hole 43, 61 ... Dust seal 44, 63 ... Circular ring plate-shaped seal Main body 46, 64 ... Disc-shaped metal cover 47 ... Outer peripheral part of metal cover 46 ... Hydraulic cylinder or air cylinder 51 ... One end closed cylinder 53 ... Lid 56 ... Piston rod 62 ... Rod seal α ... Inclination angle

Claims (2)

  A storage body having a circular opening and having an opening internal space connected to the cylindrical main internal space, and a movement that is stored in the internal space of the storage body and that part protrudes outside through the circular opening and can reciprocate. A motion member comprising a member and a circular ring-shaped dust seal having a central hole through which the motion member is inserted and having an outer peripheral portion fitted in a circular ring-shaped support space provided in the outer peripheral portion of the opening internal space An apparatus having a sealing structure, wherein the inner diameter of the circular opening is made larger than the inner diameter of the cylindrical main inner space, and the inner diameter of the opening inner space is gradually increased toward the inner side to make the opening inner space a truncated cone. An apparatus having a moving member sealing structure, characterized in that the axis of the truncated conical opening internal space and the columnar main internal space coincide with each other.   As the dust seal, a circular ring plate-shaped seal body having a central hole, and a disk having a central hole corresponding to the central hole and covering a main surface and an outer peripheral surface of the circular ring plate-shaped seal body. The outer diameter of the seal body is larger than the inner diameter of the cylindrical main inner space, and the outer diameter of the metal cladding is equal to or smaller than the inner diameter of the circular opening. With the metal sheath facing outward, the seal body is overlaid so that it fits into the interior space of the metal sheath, and the dust seal is inserted into the internal space of the frustoconical opening. The outer periphery of the metal cover surrounding the seal body is deformed so that the outer diameter increases toward the back side, and the outer periphery of the metal cover becomes the outer periphery of the frustoconical opening internal space. Circular ring support provided Apparatus having a movable member sealing structure according to claim 1, characterized in that fitted into the space portion.

Images