WO2019087635A1

WO2019087635A1 - Rotary damper

Info

Publication number: WO2019087635A1
Application number: PCT/JP2018/036292
Authority: WO
Inventors: 一正中屋
Original assignee: 株式会社ソミック石川
Priority date: 2017-10-31
Filing date: 2018-09-28
Publication date: 2019-05-09
Also published as: JP6474479B1; CN111164327B; CN111164327A; JP2019082208A

Abstract

Provided is a rotary damper wherein the generation of noise and vibration during operation can be suppressed. This rotary damper (100) is provided with a housing (101). The housing (101) has a rotor (120) provided within the closed-end circular cylindrical housing body (102) and is closed by a cover body (110). An inner chamber (103) within a housing body (101) is divided into four individual chambers by stationary vanes (104, 105) and by movable vanes (126, 127) provided to the rotor (120). The inner chamber wall surface (103b) of the inner chamber (103), on which the movable vanes (126, 127) slide, and shaft body-facing end sections (104b, 105b) of the stationary vanes (104, 105), which slide on the shaft body (121) of the rotor (120), comprise sloped surfaces. Seal bodies (106, 128) formed from elastic bodies are provided between the inner chamber wall surface (103b) and the movable vanes (126, 127) and between the shaft body (121) and the shaft body-facing end sections (104a, 105b).

Description

Rotary damper

The present invention relates to a rotary damper used as a kinetic energy damping device in a pivoting mechanism of a four- or two-wheeled self-propelled vehicle or industrial machine tool.

2. Description of the Related Art Conventionally, in four-wheel or two-wheel self-propelled vehicles or industrial machine tools, a rotary damper is used as a kinetic energy damping device in a pivoting mechanism. For example, Patent Document 1 below discloses a rotary damper in which a rotor having a pair of vane-like vanes in a large diameter portion of a stepped rod in a cylindrical casing is supported at both ends (See FIG. 1 in Patent Document 1 below).

JP-A-9-170638

However, in the rotary damper disclosed in Patent Document 1, although not shown between the casing and the rotor, axial displacement of the rotor is allowed for smooth assembly and operation of the both. Since a predetermined gap (so-called rattle) is generally set, there is a problem that abnormal noise and vibration may occur due to the rattling between the casing and the rotor when the rotary damper is operated.

The present invention has been made to address the above problems, and an object thereof is to provide a rotary damper that can suppress the generation of abnormal noise and vibration during operation.

In order to achieve the above object, the feature of the present invention is to form a wall shape along the radial direction in the same inner chamber while having a cylindrical inner chamber for containing the fluid in a liquid tight manner, A rotary damper comprising: a housing having a fixed vane which impedes flow; and a rotor having a movable vane which rotates while pushing a fluid while partitioning an inner chamber to an outer peripheral portion of a shaft. At least one of the inner wall surface of the moving housing and the shaft-facing end of the fixed vane on which the shaft of the movable vane slides is constituted by an inclined surface inclined along the axis of the inner chamber, and the rotor is A seal formed of an elastic body provided between the inner wall surface formed on the inclined surface and the movable vane and / or between the shaft facing end portion formed on the inclined surface and the shaft; Being pressed In the door.

According to the feature of the present invention configured as described above, the rotary damper includes the shaft facing end and the shaft formed between the inner wall surface of the rotor formed on the inclined surface and the movable vane and / or the inclined surface. Since the rotor is elastically pressed by the seal body formed of an elastic body provided between the rotor and the body, the rotor is assembled in a state of being elastically pressed on one side in the axial direction by the inclined surface with respect to the housing As a result, it is possible to suppress the generation of abnormal noise and vibration at the time of operation of the rotary damper.

Another feature of the present invention is that, in the rotary damper, the inclined surfaces are respectively formed on the inner wall surface and the shaft facing end.

According to another feature of the present invention configured as described above, since the inclined surface is respectively formed on the inner wall surface and the shaft facing end portion of the rotary damper, the rotor is provided in the entire circumferential direction with respect to the housing It is possible to elastically press on one side in the axial direction, and the generation of abnormal noise and vibration at the time of operation of the rotary damper can be suppressed by stable and homogeneous pressing by a stronger force.

Also, another feature of the present invention is that, in the rotary damper, the housing has a bottom portion closed at one end in the axial direction of the inner chamber and an opening portion opened at the other end and covered by a lid. The bottomed cylindrical shape is formed, and the inclined surface is formed to be separated from the axis of the inner chamber from the bottom side toward the opening side.

According to another feature of the present invention thus constituted, the rotary damper has an opening in which the housing has a bottom closed at one end in the axial direction of the inner chamber and the other is open and covered by the lid Since the inclined surface is formed to be separated from the axis of the inner chamber from the bottom side toward the opening side, and the number of parts of the rotary damper is reduced. However, the inclined surface can be easily formed using forging, casting or cutting. In the bottomed cylindrical housing, not only when the bottom completely closes one end in the axial direction of the inner chamber in the housing, but at least a part of the same end is closed and the other end is closed. A partially open shape (for example, a ring shape) is also included.

Further, another feature of the present invention is that, in the rotary damper, the fixed vanes face side wall surfaces respectively facing two inner chambers partitioned by the fixed vanes such that the thickness becomes thinner from the bottom side toward the opening side. Is composed of an inclined surface.

According to another feature of the present invention configured as described above, the rotary damper faces each of the two inner chambers partitioned by the stationary vanes such that the stationary vanes become thinner in thickness from the bottom side toward the opening side. Since the side wall surface to be formed is an inclined surface, it is possible to improve the strength of the root portion of the fixed vane and to improve the overall rigidity of the fixed vane while suppressing the decrease in the volume of the inner chamber and the increase in weight of the rotary damper. it can.

Another feature of the present invention is that, in the rotary damper, the seal body is configured such that the surface facing the inclined surface is an inclined surface parallel to the inclined surface.

According to another feature of the present invention configured as described above, the rotary damper is configured with an inclined surface because the surface facing the inclined surface is configured with an inclined surface parallel to the inclined surface. The rotor can be more effectively pressed on one side in the axial direction within the housing while improving the liquid tightness by improving the adhesion to the inner wall surface of the inner chamber and / or the axially opposed end face of the movable vane, and the rotary It is possible to suppress the generation of abnormal noise and vibration during operation of the damper.

It is a perspective view showing roughly the whole composition of the rotary damper concerning the present invention. FIG. 2 is an exploded exploded perspective view showing a housing body, a seal body for the housing body, a rotor, and a seal body for the rotor, which constitute the rotary damper shown in FIG. 1. It is a front view which shows roughly the whole structure of the rotary damper shown in FIG. FIG. 5 is a cross-sectional view of the rotary damper viewed from 4-4 shown in FIG. 3; FIG. 5 is a cross-sectional view of the rotary damper viewed from 5-5 shown in FIG. 3; It is explanatory drawing which showed typically the structure of the cross section in order to demonstrate the action | operation state of the rotary damper shown in FIG. It is explanatory drawing which shows the state which the rotor rotated clockwise from the state shown in FIG. It is explanatory drawing which shows the state which the rotor rotated to the other side from the state shown in FIG. It is explanatory drawing which shows the state which the rotor rotated to anticlockwise rotation from the state shown in FIG.

Hereinafter, an embodiment of a rotary damper according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view schematically showing an entire configuration of a rotary damper 100 according to the present invention. 2 is an exploded exploded perspective view showing the housing body 102, the seal body 106 for the housing body 102, the rotor 120, and the seal body 128 for the rotor 120, which constitute the rotary damper 100 shown in FIG. FIG. 3 is a front view schematically showing an entire configuration of the rotary damper 100 shown in FIG. It should be noted that each drawing referred to in the present specification has a portion schematically represented such as exaggeratingly showing a part of component to facilitate understanding of the present invention. For this reason, the dimensions, proportions, etc. between the components may be different. The rotary damper 100 is a damping device attached to the base end of a swing arm that supports the rear wheels of two-wheeled self-propelled vehicles (bikes) so as to be able to move up and down, thereby damping kinetic energy when the rear wheels move vertically. .

(Configuration of rotary damper 100)
The rotary damper 100 includes a housing 101. The housing 101 is a component that configures the housing of the rotary damper 100 while rotatably holding the rotor 120, and is made of various resin materials such as an aluminum material, an iron material, a zinc material, or a polyamide resin. Specifically, the housing 101 mainly includes the housing body 102 and the lid 110.

The housing body 102 is a component that accommodates

movable vanes

126 and 127 of the rotor 120 and the fluid body 140 described later, and rotatably supports one end of the shaft 121 of the rotor 120, and one end of the cylinder is It is formed in a bottomed cylindrical shape which is largely open and whose other end is small and open. More specifically, in the housing body 102, a cylindrical inner chamber 103 is formed on the side of the opening portion 102a which is largely opened at one end of the cylindrical body, and the housing main body 102 is opened in the bottom portion 103a of the inner chamber 103. A rotor support portion 107 is formed.

The inner chamber 103 is a space that accommodates the fluid 140 together with the

movable vanes

126 and 127 of the rotor 120 in a fluid-tight manner, and the two halves facing each other via the rotor 120 disposed centrally in the housing body 102. It consists of a cylindrical space. In this case, the inner chamber wall surface 103b, which is the inner wall surface of the inner chamber 103 in which the

movable vanes

126 and 127 slide, is formed by an inclined surface. Specifically, the inner chamber wall surface 103b is formed in a conical surface taper shape in which the inner diameter is expanded from the bottom portion 103a side toward the opening portion 102a. In the present embodiment, the inner chamber wall surface 103 b is formed by an inclined surface having an inclination angle α of 0.5 ° with respect to the axis of the inner chamber 103. In the inner chamber 103, fixed

vanes

104 and 105 are formed integrally with the housing body 102, respectively.

The

fixed vanes

104 and 105 are wall-shaped portions that partition the interior of the inner chamber 103 together with the rotor 120 to form the individual chambers R1 to R4, and project inward from the inner chamber wall surface 103b along the axial direction of the housing main body 102. It is formed to overhang in a shape. In this case, the two fixed

vanes

104 and 105 are provided at mutually opposing positions in the circumferential direction on the inner peripheral surface of the inner chamber wall surface 103b. In each of the fixed

vanes

104 and 105, lid

opposing ends

104a and 105a respectively opposing the lid 110 described later and

shaft opposing ends

104b and 105b each opposing the shaft 121 of the rotor 120 are concaved. It is formed in the shape of a recessed groove, and the seal body 106 is fitted in each of these grooves.

In this case, the lid facing

end portions

104a and 105a are formed with a constant width and depth. On the other hand, the shaft facing

end portions

104b and 105b are formed along the axial direction of the housing main body 102, and the bottom in each groove is radially outward of the inner chamber 103 from the bottom 103a to the opening 102a. It is composed of an expanding slope. In the present embodiment, the shaft facing

end portions

104b and 105b are formed by an inclined surface having an inclination angle β of 0.5 ° with respect to the axis of the inner chamber 103, similarly to the inner chamber wall surface 103b. The shaft facing

end portions

104b and 105b are each formed of an inclined surface in which the distance between the side walls forming the groove, that is, the groove width spreads from the bottom portion 103a side to the opening portion 102a side.

In addition, fixed

vanes

104 and 105 are inclined surfaces in which the side wall surfaces 104c and 105c that face the individual chambers R1 to R4 and form the individual chambers R1 to R4 in the inner chamber 103 are inclined along the axial direction of the inner chamber 103. It consists of Specifically, the side wall surfaces 104c and 105c are formed as inclined surfaces in which the thickness of the fixed

vanes

104 and 105 is reduced from the bottom 103a to the opening 102a. In the present embodiment, the side wall surfaces 104c and 105c are imaginary lines parallel to the axis of the inner chamber 103, in other words, inclinations of the shaft facing ends 104b and 105b with respect to an imaginary line perpendicular to the bottom 103a. It is formed by the same 0.5 ° inclined surface as the angle β.

The seal body 106 is a component for securing the liquid tightness of the individual chambers R1 to R4 formed in the inner chamber 103, and is configured by forming an elastic material such as a rubber material in an L shape in side view There is. More specifically, in the seal body 106, the radial direction portion 106a press-fitted into the lid facing

end portions

104a and 105a and the axial direction portion 106b press-fitted to the shaft facing

end portions

104b and 105b are L-shaped. It is integrally formed in a shape. And these radial direction part 106a and axial direction part 106b are formed by the magnitude | size which each protrudes from lid opposing

end part

104a, 105a and axial body opposing

end part

104b, 105b.

Further, the axial portion 106b is an inclined surface extending in parallel with the inclined surface constituting the shaft opposing ends 104b, 105b, that is, the opening 102a from the bottom 103a side. It is configured by an inclined surface that protrudes outward in the radial direction of the inner chamber 103 toward the side and also protrudes in a direction orthogonal to the same radial direction. In other words, in the axial direction portion 106b, the thickness of the portion fitted to the shaft facing

end portions

104b and 105b is continuously increased along the two directions from the bottom portion 103a side toward the opening portion 102a side. It is formed to be As a material which comprises this sealing body 106, there exist nitrile rubber, hydrogenated nitrile rubber, or fluororubber as a rubber material.

The rotor support portion 107 is a cylindrical portion that rotatably supports one end of the shaft 121 of the rotor 120. The rotor support portion 107 supports the shaft body 121 of the rotor 120 in a fluid-tight manner via a sealing material such as a bearing and a packing.

The lid 110 is a component for sealing the inner chamber 103 formed in the housing main body 102 in a fluid-tight manner, and one end of the cylindrically formed rotor support portion 111 protrudes in a flange shape. Is formed. The rotor support portion 111 is a cylindrical portion which rotatably supports the other end of the shaft 121 of the rotor 120. The rotor support portion 111 supports the shaft body 121 of the rotor 120 in a fluid tight manner via a sealing material such as a bearing and packing.

The lid 110 is also provided with

bypass passages

112a and 112b and

adjustment needles

113a and 113b, respectively. The bypass passage 112a is a passage that connects the first individual chamber R1 and the second individual chamber R2 in the inner chamber 103 so as to cause the fluid 140 to flow with each other and causes the first individual chamber R1 and the second individual chamber R2 to communicate with the outside. . The bypass passage 112b is a passage that connects the second individual chamber R2 and the fourth individual chamber R4 in the inner chamber 103 so as to allow the fluid 140 to flow with each other and causes the second individual chamber R2 and the fourth individual chamber R4 to communicate with the outside. .

Further, the adjustment needles 113a and 113b are components for sealing the inside of the

bypass passages

112a and 112b from the outside and adjusting the flow rate of the fluid 140 flowing, and using a tool (not shown) such as a driver. The flow rate of the fluid 140 can be increased or decreased by using and rotating. The lid 110 is attached to the end of the housing body 102 on the side where the inner chamber 103 is opened by four bolts 114.

The rotor 120 is disposed in the inner chamber 103 of the housing 101 and divides the inside of the inner chamber 103 into four spaces, ie, a first single chamber R1, a second single chamber R2, a third single chamber R3 and a fourth single chamber R4. It is a component for respectively increasing or decreasing the volume of each of the first single chamber R1, the second single chamber R2, the third single chamber R3 and the fourth single chamber R4 by rotating in the inner chamber 103, mainly the shaft It comprises 121 and

movable vanes

126 and 127.

The shaft body 121 is a round bar-like portion that supports the

movable vanes

126 and 127, and is made of various resin materials such as an aluminum material, an iron material, a zinc material, or a polyamide resin. An accumulator mounting portion 122 is formed at one end of the shaft body 121 and a connection portion 123 is provided at the other end.

The accumulator attachment portion 122 is a bottomed cylindrical hole in which an accumulator (not shown) is attached. Here, the accumulator is a tool for compensating for a volume change due to expansion or contraction due to a temperature change of the fluid 140 in the inner chamber 103, and is provided in communication with a first one-way communication passage 125 described later. The connection portion 123 is a portion for connecting to one of the two parts to which the rotary damper 100 is attached. In the present embodiment, the connection portion 123 is configured by a bottomed cylindrical hole whose cross-sectional shape is a hexagonal shape.

Further, as shown in FIGS. 6 to 9, the shaft 121 is formed with a first bidirectional communication passage 124 and a first unidirectional communication passage 125. In the first bidirectional communication passage 124, the volume is simultaneously reduced by rotation of the

movable vanes

126 and 127 to one side, and the volume is simultaneously increased by rotation of the

movable vanes

126 and 127 to the other. It is a passage which enables the fluid 140 to flow mutually. In the present embodiment, the first two-way communication passage 124 is a first single chamber in which the volume is simultaneously reduced by the illustrated counterclockwise rotation of the

movable vanes

126 and 127 and the volume is simultaneously increased by the illustrated clockwise rotation. It is formed in the state which penetrated shaft 121 so that R1 and the 3rd individual room R3 may connect mutually.

In the first one-way communication passage 125, the volume is simultaneously increased by the pivoting of the

movable vanes

126 and 127 to the one side, and the volume is simultaneously reduced by the pivoting of the

movable vanes

126 and 127 to the other It is a passage which distributes the fluid 140 only from one side to the other. In the present embodiment, the first one-way communication passage 125 is a second single chamber in which the volume is simultaneously increased by the illustrated counterclockwise rotation of the

movable vanes

126 and 127 and the volume is simultaneously reduced by the illustrated clockwise rotation. R2 and the fourth separate chamber R4 are formed in a state of penetrating the shaft body 121 via the one-way valve 125a so that the fluid 140 can flow only from the second separate chamber R2 to the fourth separate chamber R4. The first one-way communication passage 125 is also in communication with the accumulator on the upstream side of the flow direction of the fluid 140 with respect to the one-way valve 125a.

The one-way valve 125a allows the flow of the fluid 140 from the second individual chamber R2 side to the fourth individual chamber R4 side in the first one-way communication passage 125 which causes the second individual chamber R2 and the fourth individual chamber R4 to communicate with each other. It is a valve that blocks the flow from the four-chamber R4 side to the second individual chamber R2 side.

The

movable vanes

126 and 127 are components for respectively increasing and decreasing the volume of each space in a fluid tight manner while partitioning the inside of the inner chamber 103 into a plurality of spaces, and in the radial direction of the shaft body 121 (inner chamber 103) Each is constituted by an extending plate-like body. In this case, these two

movable vanes

126 and 127 are formed to extend in opposite directions (in other words, on the same imaginary plane) via the shaft 121. These

movable vanes

126 and 127 have bottom-facing

end portions

126a and 127a and inner-wall facing

end portions

126b and 126b at end faces of the C shape (or U shape) facing the bottom portion 103a, the inner wall surface 103b and the lid 110 respectively. A groove 127b and a

lid facing end

126c, 127c are formed in a concave shape.

In this case, the respective grooves constituting the bottom opposite ends 126a and 127a, the inner wall opposite ends 126b and 127b, and the lid opposite ends 126c and 127c are formed to have a constant width and depth and a predetermined depth. There is. A seal body 128 is fitted in the respective grooves of the bottom opposite ends 126a and 127a, the inner wall opposite ends 126b and 127b, and the lid opposite ends 126c and 127c.

Similar to the seal body 106, the seal body 128 is a component for securing the liquid tightness of the individual chambers R1 to R4 formed in the inner chamber 103, and is made of an elastic material such as rubber similar to the seal body 106. It is formed and formed in C shape (or U shape) by side view. More specifically, the seal body 128 has a bottom side 128a press-fit into the bottom

opposite end

126a, 127a, an inner wall side 128b press-fit into the inner wall opposite

end

126b, 127b, and a lid A lid side portion 128c press-fitted into the

end portions

126c and 127c is integrally formed in a C shape (or a U shape). The bottom side portion 128a, the inner wall side portion 128b and the lid side portion 128c respectively project from the bottom facing ends 126a and 127a, the inner wall facing ends 126b and 127b, and the lid facing ends 126c and 127c. It is formed of

In this case, the inner wall side portion 128b is an inclined surface extending parallel to the inclined surface constituting the inner chamber wall surface 103b, ie, the inner chamber 103 facing the opening portion 102a from the bottom portion 103a side. It is comprised by the inclined surface which overhangs to the radial direction outer side of. In other words, the inner wall side portion 128b is formed such that the thickness of the portion fitted to the inner wall facing

end portions

126b and 127b is continuously increased from the bottom portion 103a side toward the opening portion 102a. Due to these, the

movable vanes

126 and 127 cooperate with the fixed

vanes

104 and 105 to form the first chamber R1, the second chamber R2, the third chamber R3 and the fourth chamber which are four spaces in the inner chamber 103. Form R4 together in a liquid tight manner.

More specifically, in the inner chamber 103, a first individual chamber R1 is formed by the fixed vane 104 and the movable vane 126, and a second individual chamber R2 is formed by the movable vane 126 and the fixed vane 105. And the movable vane 127 form a third individual chamber R 3, and the movable vane 127 and the fixed vane 104 form a fourth individual chamber R 4. That is, the first compartment R1, the second compartment R2, the third compartment R3 and the fourth compartment R4 are formed adjacent to each other in the inner chamber 103 along the circumferential direction.

A second bidirectional communication passage 131 and a second one-way communication passage 132 are formed in the

movable vanes

126 and 127, respectively. The second two-way communication passage 131 is a first one-way communication passage with the first single chamber R1 of the first single chamber R1 and the third single chamber R3 as two communicating single chambers communicated by the first two-way communication passage 124. Movable vanes 126 which divide the first single chamber R1 and the second single chamber R2 such that the second single chamber R2 of the second single chamber R2 and the second single chamber R2 of the fourth single chamber R4 as two single-sided communicating single chambers communicated by 125 communicate with each other. Is formed.

The second two-way communication passage 131 causes the fluid 140 to flow from the second single chamber R2 side which is a one-side communicating single chamber to the first single chamber R1 side which is a communicating single chamber, and to the second single chamber R2 side from the first single chamber R1 side. The fluid 140 is configured to be distributed while being restricted. Specifically, as shown in FIG. 8, the second two-way communication passage 131 is configured by arranging a one-way valve 131a and a throttle valve 131b in parallel.

The one-way valve 131a is a valve that circulates the fluid 140 from the second individual chamber R2 side to the first individual chamber R1 side and prevents the flow of the fluid 140 from the first individual chamber R1 side to the second individual chamber R2 side. ing. Further, the throttle valve 131 b is configured of a valve that can be circulated in both directions while restricting the flow of the fluid 140 between the first individual chamber R <b> 1 and the second individual chamber R <b> 2. In this case, while restricting the flow of the fluid 140 in the throttle valve 131b, the flow is performed under the same conditions (for example, pressure and viscosity of the fluid) with respect to the flowability of the fluid 140 in the one-way valve 131a. It means that the body 140 is hard to flow.

The second one-way communication passage 132 is a communication chamber in which the second two-way communication passage 131 is not in communication, and a fourth one-way communication chamber in which the second two-way communication passage 131 is not in communication. The third individual room R3 and the fourth individual room R4 are made to flow while restricting the fluid 140 only from the fourth individual room R4 side which is one-side communicating individual room between the individual room R4 and the third individual room R3 side which is the communicating individual room. It is formed in the movable vane 127 which divides. Specifically, the second one-way communication passage 132 includes a one-way valve 132a that allows the fluid 140 to flow only from the fourth individual chamber R4 side to the third individual chamber R3 side, and a throttling valve that restricts the flow rate of the fluid 140 And 132b are arranged in series. In this case, while restricting the flow of the fluid 140 in the throttle valve 132b, the flow is performed under the same conditions (for example, pressure, viscosity of the fluid, etc.) with respect to the flowability of the fluid 140 in the one-way valve 132a. It means that the body 140 is hard to flow.

The fluid body 140 is a substance for causing the rotary damper 100 to act as a damper function by applying resistance to the

movable vanes

126 and 127 which rotate the inner chamber 103, and is filled in the inner chamber 103. . The fluid body 140 is made of a fluid, gel-like or semi-solid substance having a flowability having a viscosity corresponding to the specification of the rotary damper 100. In this case, the viscosity of the fluid 140 is appropriately selected according to the specifications of the rotary damper 100. In the present embodiment, the fluid 140 is made of oil, such as mineral oil or silicone oil.

The rotary damper 100 thus configured is provided between two parts movably connected to each other. For example, the rotary damper 100 is mounted with the housing 101 fixed to the frame side which is a basic frame of a two-wheeled self-propelled vehicle (not shown) and supports the rear wheels of the two-wheeled self-propelled vehicle The rotor 120 is attached with the proximal end side of the swing arm as the movable side.

(Manufacture of rotary damper 100)
Next, the manufacturing process of the main part of the rotary damper 100 will be described. An operator who manufactures this rotary damper 100 first makes, with respect to one rotary damper 100, one housing main body 102, two seal bodies 106, one lid 110, one rotor 120 and two seal bodies 128. Prepare each In this case, after the fixed

vanes

104 and 105 and the rotor support portion 107 are integrally formed on the housing body 102 by forging, the housing body 102 is manufactured by forming an attachment hole or the like by cutting. In addition, the lid 110 is manufactured by forming an attachment hole or the like by cutting after the external shape is formed by forging.

In addition, after the rotor 120 integrally forms the shaft 121 and the

movable vanes

126 and 127 by forging, the portion to which the seal body 128, the one-

way valves

131a and 132a and the

throttle valves

131b and 132b are attached is cut. Each is molded by The one-

way valves

131a and 132a and the

throttle valves

131b and 132b that constitute the second two-way communication passage 131 and the second one-way communication passage 132 are disposed with respect to the

movable vanes

126 and 127.

The housing body 102, the lid 110, and the rotor 120 may be formable by casting or cutting, and when each of these parts is made of a resin material, injection molding and cutting may be performed. It can be molded using

Next, the worker attaches the two seal bodies 106 to the

stationary vanes

104 and 105, respectively. Specifically, the operator press-fits the seal body 106 into the grooves of the lid facing

end portions

104a and 105a and the shaft facing

end portions

104b and 105b of the fixed

vanes

104 and 105, respectively. Thus, the two seal bodies 106 face the shaft body 121 of the rotor 120 while the radial direction portion 106 a which is the end face facing the lid 110 extends in the radial direction orthogonal to the axial direction of the inner chamber 103. The axial portion 106 b is mounted in a state of extending in parallel with the axial direction of the inner chamber 103. The seal body 106 may be fixed to the fixed

vanes

104 and 105 using an adhesive.

Next, the worker attaches the two seal bodies 128 to the

movable vanes

126 and 127, respectively. More specifically, the worker can form the seal body 128 on the bottom opposing ends 126a and 127a formed on the outer edges of the

movable vanes

126 and 127, the inner wall opposing ends 126b and 127b, and the lid opposing ends 126c and 127c. Press-fit into each groove of. As a result, the two seal bodies 128 extend in the radial direction orthogonal to the axial direction of the inner chamber 103, with the lid side portion 128c and the bottom side portion 128a being end surfaces respectively facing the lid 110 and the bottom portion 103a. An inner wall side portion 128b, which is an end surface facing the inner chamber wall surface 103b of the housing 101, is mounted in a state of extending in parallel to the inner chamber wall surface 103b. The seal body 128 may be fixed to the

movable vanes

126 and 127 using an adhesive.

Next, the operator assembles the rotor 120 into the housing body 102. Specifically, the operator arranges the bearing and the seal member on the rotor support portion 107 of the housing main body 102, and then inserts the rotor 120 into the housing main body 102 from the side of the accumulator mounting portion 122 and attaches it. In this case, the operator inserts the rotor 120 into the housing main body 102 while resisting the elastic force of the

seal bodies

106 and 128.

Next, the worker attaches the lid 110 to the housing body 102. Specifically, the operator arranges the bearing and the seal member on the rotor support portion 111 of the lid 110, and then inserts the rotor 120 into the rotor support portion 111 while the lid 110 is on the opening 102a of the housing main body 102. And assemble with bolts 114. In this case, the operator presses the lid 110 against the opening 102 a of the housing main body 102 while assembling against the elastic force of the

seal bodies

106 and 128.

As a result, the inside of the inner chamber 103 of the housing 101 is partitioned by the fixed

vanes

104 and 105, the shaft 121 and the

movable vanes

126 and 127 to form four individual chambers R1 to R4. In this case, a slight clearance C in the axial direction is set in the inner chamber 103 between the inner chamber 103 and the rotor 120 in order to ensure smooth assembly and operation after assembly. Thus, the rotor 120 is assembled so as to be slightly displaceable in the axial direction.

However, since the inner chamber wall surface 103b and the shaft facing

end portions

104b and 105b in the housing main body 102 are formed as an inclined surface toward the opening 102a side, the inner chamber wall surface 103b and the shaft facing end portion 104b The

movable vanes

126 and 127 of the rotor 120 and the shaft 121, which are respectively pressed to the seal 105 and the seal 105b via the

seal members

106 and 128, are disposed in a state of being elastically biased toward the opening 102a. Thus, the rotor 120 is mounted in the inner chamber 103 in a state of being elastically biased toward the opening 102 a. The rotor 120 rotates relative to the housing 101 in the biased state to increase or decrease the volume of each of the four separate chambers R1 to R4 formed in the inner chamber 103.

Next, the worker injects the fluid 140 into the housing body 102 via the

bypass passages

112 a and 112 b of the lid 110 and performs air removal. Next, the adjustment needles 113a and 113b are prepared and mounted on the lid 110, and adjustment work such as adjustment of the rotational force of the rotor 120 is performed to complete the rotary damper 100. The final work such as the adjustment work is not directly related to the present invention, and thus the description thereof is omitted.

(Operation of rotary damper 100)
Next, the operation of the rotary damper 100 configured as described above will be described. The operation will be described with reference to FIGS. 6 to 9 schematically showing the inside of the inner chamber 103 in order to facilitate understanding of the movement of the rotor 120 and the fluid 140 in the inner chamber 103. 6 to 9 schematically show the inside of the rotary damper 100 viewed from the broken line arrow A in FIG. 5 in order to help understand the behavior of the fluid 140 with respect to the movement of the

movable vanes

126 and 127. Further, in FIG. 6 to FIG. 9, the state in which the pressure of the fluid 140 is relatively high relative to the other compartments is indicated by dark hatching, and the state in which the pressure is relatively low is indicated by light hatching. Further, in FIGS. 7 and 9, the pivoting direction of the

movable vanes

126 and 127 is indicated by a thick broken line arrow, and the flow direction of the fluid 140 is indicated by a thin broken line arrow.

First, in a state where the self-propelled vehicle travels on a flat surface and the swing arm is lowered, as shown in FIG. 6, in the rotary damper 100, the movable vane 126 comes closest to the fixed vane 104 and the movable vane 127 is fixed. It is in the state of being closest to the vane 105. That is, in the rotary damper 100, the respective volumes of the first individual chamber R1 and the third individual chamber R3 are in the minimum state, and the respective volumes of the second individual chamber R2 and the fourth individual chamber R4 are in the maximum state.

In this state, when the rear wheel of the mobile vehicle rides on a step or the like, the swing arm ascends so that the rotary damper 100 rotates the rotor 120 clockwise as shown in FIG. That is, in the rotary damper 100, the movable vanes 126 rotate toward the fixed vanes 105 and the movable vanes 127 rotate toward the fixed vanes 104. Thus, in the rotary damper 100, the respective volumes of the first single chamber R1 and the third single chamber R3 increase, and the respective volumes of the second single chamber R2 and the fourth single chamber R4 decrease.

In this case, the fourth individual chamber R4 of the second individual chamber R2 and the fourth individual chamber R4 in the maximum volume is “inflow allowed, outflow not possible” by the first one-way communication passage 125 with respect to the second individual chamber R2. In addition, the second one-way communication passage 132 makes the third individual chamber R3 "inflow impossible, outflow possible with restriction". Therefore, in the fourth separate chamber R4, the fluid 140 in the fourth separate chamber R4 flows out only into the third separate chamber R3 via the throttle valve 132b. As a result, the pressure in the fourth individual chamber R4 is increased to be in the high pressure state, so there is no inflow of the fluid body 140 from the second individual chamber R2 communicated via the first one-way communication passage 125.

In addition, at the same time, the second single chamber R2 is in the state of “inflow is not possible and outflow is possible” by the first one-way communication passage 125 with respect to the fourth single chamber R4. The two-way communication path 131 indicates that “inflow is possible with squeezing and outflow is possible”. In this case, the fourth separate chamber R4 is in the high pressure state as described above. Accordingly, in the second separate chamber R2, the fluid 140 in the second separate chamber R2 flows out into the first separate chamber R1 via the second bidirectional communication path 131. In this case, since the fluid 140 flows smoothly through the one-way valve 131 a in the second two-way communication passage 131, the second individual chamber R <b> 2 maintains the non-high pressure state while suppressing the pressure increase. Here, the non-high pressure state is relative to the pressure of the other individual chamber.

On the other hand, the third single chamber R3 of the first single chamber R1 and the third single chamber R3 in the minimum volume is "inflow possible, outflow possible" by the first bidirectional communication path 124 with respect to the first single chamber R1. In addition to being in the state, it is in the state of “inflow is possible with squeezing, outflow is not possible” by the second one-way communication passage 132 with respect to the fourth individual chamber R4. Accordingly, the third separate chamber R3 maintains the non-high pressure state because the fluid 140 flows from the first separate chamber R1 and the fourth separate chamber R4 via the throttle valve 132b.

Further, at the same time, the first individual chamber R1 is in the state of “inflow possible, outflow possible” by the first two-way communication passage 124 with respect to the third individual chamber R3, and The two-way communication passage 131 is in the state of “inflow is possible, outflow is possible with throttling”. Therefore, since the fluid 140 flows from the second separate chamber R2 into the first separate chamber R1 and the fluid 140 flows out to the third separate chamber R3, the non-high pressure state is maintained.

That is, when the rotor 120 is rotated clockwise in the figure, since the outflow of the fluid 140 is limited only in the fourth individual chamber R4 and the rotary damper 100 is in a high pressure state, the damping force is an anticlockwise It is smaller than the damping force at the time of turning. Then, after that, as shown in FIG. 8, in the rotary damper 100, the movable vanes 126 approach the fixed vanes 105 the closest and the movable vanes 127 approach the fixed vanes 104 the closest. That is, in the rotary damper 100, the respective volumes of the first single chamber R1 and the third single chamber R3 are respectively maximized, and the respective volumes of the second single chamber R2 and the fourth single chamber R4 are respectively minimized. In this state, the swing arm of the self-propelled vehicle is in a raised state.

Next, when the swing arm is lowered, as shown in FIG. 9, the rotary damper 100 rotates the rotor 120 counterclockwise in the drawing. That is, in the rotary damper 100, the movable vanes 126 rotate toward the fixed vanes 104 and the movable vanes 127 rotate toward the fixed vanes 105. Thus, in the rotary damper 100, the respective volumes of the first single chamber R1 and the third single chamber R3 decrease, and the respective volumes of the second single chamber R2 and the fourth single chamber R4 increase.

In this case, the first single chamber R1 of the first single chamber R1 and the third single chamber R3 in the maximum volume is “inflow allowed, outflow possible” by the first bidirectional communication passage 124 with respect to the third single chamber R3. In addition, the second two-way communication passage 131 allows the second individual chamber R2 to "inflow is possible and outflow is possible with restriction". Further, in this case, the volume of the third individual chamber R3 is decreasing along with the first individual chamber R1 due to the rotation of the movable vane 127. Accordingly, in the first separate chamber R1, the fluid 140 in the first separate chamber R1 flows out only into the second separate chamber R2 via the throttling. As a result, the pressure in the first individual chamber R1 rises to a high pressure state.

Also, at the same time, the third separate chamber R3 is in the state of "inflow possible, outflow possible" by the first two-way communication path 124 with respect to the first separate chamber R1, and The two-way communication path 132 is in the state of “inflow is possible with squeezing, and outflow is not possible”. Accordingly, in the third private chamber R3, the fluid 140 in the third private chamber R3 flows out only into the first private chamber R1. As a result, the pressure in the third separate chamber R3 increases together with the first separate chamber R1 to a high pressure state.

On the other hand, the second individual chamber R2 of the second individual chamber R2 and the fourth individual chamber R4 having the minimum volume is “inflow is possible with restriction due to the second bidirectional communication passage 131 with respect to the first individual chamber R1; While being in the state of "possible", the first one-way communication passage 125 is in the state of "inflow impossible, outflow possible" with respect to the fourth individual chamber R4. Therefore, the second private chamber R2 maintains the non-high pressure state because the fluid 140 flows from the first private chamber R1 through the throttling and the fluid 140 flows out to the fourth private chamber R4. That is, the second individual chamber R2 always maintains the non-high pressure state regardless of the rotational direction of the

movable vanes

126 and 127.

Further, at the same time, the fourth individual chamber R4 is in a state of “inflow is possible, outflow is not possible” by the first one-way communication passage 125 with respect to the second individual chamber R2, and the fourth individual chamber R4 is The two-way communication path 132 is in the state of “inflow is not possible, outflow is possible with throttling”. Therefore, the fourth private chamber R4 maintains the non-high pressure state because the fluid 140 only flows in from the second private chamber R2.

That is, when the rotor 120 is rotated counterclockwise in the figure, in the rotary damper 100, the first individual chamber R1 and the third individual chamber R3 are restricted in outflow of the fluid 140 and are respectively in a high pressure state. Is larger than the damping force at the time of clockwise rotation shown in the drawing. In this case, the damping force of the rotary damper 100 is twice that of the above-described clockwise rotation because the individual chamber in the high pressure state is twice as large.

Then, after this, as shown in FIG. 6, in the rotary damper 100, the movable vanes 126 approach the fixed vanes 104 the closest and the movable vanes 127 the closest the fixed vanes 105, and the first single chamber R1 and the third single chamber R3. The respective volumes of the second chamber R2 and the fourth chamber R4 return to their maximum values, respectively, while their respective volumes become minimum.

At the time of rotation operation or stationary of the rotor 120, the rotor 120 is pressed by the

seal members

106 and 128 in close contact with the inner chamber wall surface 103b formed by the inclined surface and the shaft facing

end portions

104b and 105b. Therefore, the entire rotor 120 is always elastically pressed to the lid 110 side. Thereby, in the rotary damper 100, the positional deviation in the axial direction of the rotor 120 at the time of the rotation operation or the stationary state of the rotor 120 is suppressed, and the noise due to the vibration of the rotor 120 itself or the collision to the lid 110 or the bottom 103a And vibration is suppressed.

In the above operation description, in order to facilitate understanding of the operation state of the rotary damper 100, the movable vane 126 comes closest to the fixed vane 104 and the movable vane 127 comes closest to the fixed vane 105, or the movable vane The case where the

movable vanes

126 and 127 rotate from the state where the movable vane 127 approaches the fixed vane 104 while the 126 approaches the fixed vane 105 the most has been described. However, the rotary damper 100 can naturally turn to the fixed vane 104 side or the fixed vane 105 side from the state in which the

movable vanes

126 and 127 are positioned halfway between the fixed vane 104 and the fixed vane 105 It is.

As understood from the above description of the operation method, according to the above embodiment, the rotary damper 100 is provided between the inner chamber wall surface 103b in which the rotor 120 is formed in the inclined surface and the

movable vanes

126 and 127 and on the inclined surface. The rotor 120 is resiliently pressed by the

seal bodies

106 and 128 formed of elastic bodies provided between the formed shaft facing

end portions

104 b and 105 b and the shaft body 121. By being assembled in a state of being elastically pressed to one side in the axial direction by the inclined surface, it is possible to suppress generation of abnormal noise and vibration at the time of operation of the rotary damper 100.

Furthermore, the implementation of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the object of the present invention.

For example, in the above embodiment, in the rotary damper 100, the inner chamber wall surface 103b and the shaft facing

end portions

104b and 105b are formed as inclined surfaces. However, in the rotary damper 100, at least one of the inner wall surface 103b and the shaft facing

end portion

104b, 105b may be formed as an inclined surface.

In the above embodiment, the inner chamber wall surface 103b and the shaft facing

end portions

104b and 105b are inclined surfaces separated from the axis of the inner chamber 103 from the bottom portion 103a side of the housing body 102 toward the opening portion 102a. It consisted of. However, the inner chamber wall surface 103 b and the shaft facing

end portions

104 b and 105 b may be configured by an inclined surface which is inclined along the axis of the inner chamber 103. Therefore, the inner chamber wall surface 103b and the shaft facing

end portions

104b and 105b can be configured as inclined surfaces separated from the axis of the inner chamber 103 from the opening 102a side to the bottom portion 103a side of the housing main body 102 .

Further, in the above embodiment, the inner chamber wall surface 103b and the shaft facing

end portions

104b and 105b are 0.5 ° to the axis of the inner chamber 103 from the bottom portion 103a side of the housing main body 102 toward the opening portion 102a. It comprised with the inclined surface of the inclination angles (alpha) and (beta) of. However, the inclination angles of the inner chamber wall surface 103b and the shaft facing

end portions

104b and 105b are not limited to the above embodiment. In this case, the inclination angles α and β of the inner wall surface 103b and the shaft facing

end portions

104b and 105b can be set to 0.1 ° or more and 5 ° or less, preferably 0.2 ° or more and 2 Or less, more preferably 0.2 or more and 0.5 or less. In these cases, the inclination angle α of the inner wall surface 103b and the inclination angle β of the shaft facing

end portions

104b and 105b can be set to the same angle or different angles.

Moreover, in the said embodiment, the housing 101 formed the housing main body 102 in bottomed cylindrical shape. However, the housing 101 may be configured such that the housing main body 102 is formed in a cylindrical shape, and both ends of the cylindrical body are closed by a plate-like body corresponding to the lid 110.

Further, in the above embodiment, the

seal bodies

106 and 128 are in surface contact with the inner chamber wall surface 103b and the shaft opposing

end portions

104b and 105b, respectively, which are configured by the inclined surfaces before being attached to the housing body 102 and the rotor 120. The axial direction portion 106b and the inner wall side portion 128b are formed as inclined surfaces parallel to the inclined surfaces of the inner wall surface 103b and the shaft opposing

end portions

104b and 105b. As a result, the

seal bodies

106 and 128 can be easily attached to the inner wall surface 103 b and the shaft body facing

end portions

104 b and 105 b with good adhesion. However, before the axial direction portion 106b and the inner wall side portion 128b are attached to the housing body 102 and the rotor 120, the

seal body

106, 128 does not necessarily have to the inclined surface of the inner chamber wall surface 103b and the shaft opposing

end portion

104b, 105b. It does not need to be formed in parallel, and can be formed in non-parallel, for example, parallel to the axial direction of the inner chamber 103.

Further, in the above embodiment, the fixed

vanes

104 and 105 are configured such that the side wall surfaces 104c and 105c are inclined surfaces such that the thickness on the bottom 103a side is thicker than the thickness on the tip of the opening 102a. ing. As a result, the fixed

vanes

104 and 105 can increase the rigidity because the thickness on the bottom portion 103 a side is thicker than the tip portion. However, the

stationary vanes

104 and 105 can also be configured such that the side wall surfaces 104c and 105 are erected at right angles to the bottom portion 103a.

However, the side wall surfaces 104c and 105c may be formed as inclined surfaces in which the thickness of the fixed

vanes

104 and 105 decreases from the opening 102a side toward the bottom 103a side, or along the radial direction of the inner chamber 103. It may be composed of an inclined surface whose thickness varies continuously. Further, the side wall surfaces 104c and 105c can be configured such that the thickness of the fixed

vanes

104 and 105 is constant from the opening 102a to the bottom 103a, that is, not perpendicular to the slope 103a but perpendicular to the bottom 103a. . In the housing body 102, the formability and processing efficiency by forging are improved by forming the inner wall surface 103b, the shaft facing

end portions

104b and 105b, and the side wall surfaces 104c and 105c with inclined surfaces in the same direction. It can be done.

The rotary damper 100 divides the inside of one inner chamber 103 into a first individual chamber R1, a second individual chamber R2, a third individual chamber R3 and a fourth individual chamber R4, which are four individual chambers by

fixed vanes

104 and 105 and

movable vanes

126 and 127. The However, the rotary damper 100 has at least two separate chambers in which the volume is simultaneously reduced by the pivoting of the

movable vanes

126 and 127 and the volume is simultaneously increased by the pivoting of the

movable vanes

126 and 127. If the

movable vanes

126 and 127 have at least two chambers in which the volume is simultaneously increased by the pivoting of the

movable vanes

126 and 127 to the one and the volume is simultaneously reduced by the pivoting of the

movable vanes

126 and 127 to the other Good.

That is, the rotary damper 100 has at least two separate chambers whose volumes simultaneously increase when the rotor 120 rotates in one direction in one inner chamber 103 and at least two separate chambers whose volumes simultaneously decrease separately from these separate chambers. As long as you have Therefore, the rotary damper 100 has three individual chambers whose volumes increase simultaneously with rotation of the rotor 120 in one internal chamber 103 in one direction, and three individual chambers whose volumes simultaneously decrease separately from these individual chambers. Can also be configured.

Further, in the above embodiment, the rotary damper 100 is configured such that the rotor 120 is provided with the accumulator mounting portion 122 and the accumulator (not shown) is provided. Thus, the rotary damper 100 can compensate for a volume change due to expansion or contraction based on a temperature change of the fluid 140, and the configuration of the rotary damper 100 can be miniaturized. However, the accumulator can also be provided at a location other than the rotor 120, for example, outside the housing 101. Further, when it is not necessary to consider the volume change of the fluid 140, the rotary damper 100 can be configured with the accumulator and the accumulator mounting portion 122 omitted.

Further, in the above embodiment, the rotary damper 100 has the housing 101 at the fixed side and the rotor 120 at the movable side. However, the rotation of the rotor 120 relative to the housing 101 in the rotary damper 100 is relative. Therefore, it goes without saying that the rotary damper 100 can also make the housing 101 movable and the rotor 120 fixed.

In the above embodiment, the second bidirectional communication passage 131 and the second one-way communication passage 132 are provided in the

movable vanes

126 and 127. However, the second two-way communication passage 131 and the second one-way communication passage 132 can also be provided in the fixed

vanes

104 and 105.

Moreover, in the said embodiment, the case where the rotary damper 100 was attached to the swing arm of a two-wheel self-propelled vehicle was demonstrated. However, the rotary damper 100 is a place other than the swing arm in a two-wheeled self-propelled vehicle (for example, an opening and closing mechanism of a seat), a vehicle other than a two-wheeled self-propelled vehicle It can be attached to a mechanical device, an electric device or an appliance other than a door) or a self-propelled vehicle.

α: inclination angle of the inner wall surface, β: inclination angle of the shaft facing end, R1: first single chamber, R2: second single chamber, R3: third single chamber, R4: fourth single chamber, C: bottom of housing main body Clearance between the same bottom and the end face of the rotor shaft,
100: rotary damper, 101: housing, 102: housing body, 102a: opening, 103: inner chamber, 103a: bottom, 103b: inner chamber wall, 104, 105: fixed vane, 104a, 105a: lid facing end , 104b, 105b ... shaft opposite end, 104c, 105c ... sidewall, 106 ... seal, 106a ... radial direction, 106b ... axial, 107 ... rotor support,
DESCRIPTION OF SYMBOLS 110 ... Lid body, 111 ... Rotor support part, 112a, 112b ... Bypass channel | path, 113a, 113b ... Adjustment needle, 114 ... Bolt,
DESCRIPTION OF SYMBOLS 120 ... Rotor, 121 ... Shaft body, 122 ... Accumulator attachment part, 123 ... Connection part, 124 ... 1st two-way communication path, 125 ... 1st one-way communication path, 125a ... One-way valve, 126, 127 ... Movable vane Bottom opposed

end

126b, 127b Inner wall opposite

end

126c, 127c Lid opposite end, 128 Seal body 128a Bottom side 128b Inner wall side 128c Lid side Department,
131 second bidirectional communication passage 131a one-way valve 131b throttle valve 132 second one-way communication passage 132a one-way valve 132b throttle valve
140: Fluid.

Claims

A housing having a cylindrical inner chamber for containing the fluid in a liquid tight manner and having a fixed vane formed in the inner chamber in the shape of a wall along the radial direction to prevent circumferential flow of the fluid;
A rotary damper comprising: a rotor having movable vanes which rotate while pushing the fluid while partitioning the inner chamber on an outer peripheral portion of a shaft;
At least one of the inner wall surface of the housing in which the movable vane of the rotor slides and the shaft-facing end of the fixed vane on which the shaft of the movable vane slides in the axial direction of the inner chamber It consists of an inclined surface inclined along the
The rotor is
A seal comprising an elastic body provided between the inner wall surface formed on the inclined surface and the movable vane and / or between the shaft facing end portion formed on the inclined surface and the shaft A rotary damper characterized by being elastically pressed by a body.
In the rotary damper described in claim 1,
The inclined surface is
A rotary damper characterized in that it is respectively formed on the inner wall surface and the shaft facing end.
The rotary damper according to claim 1 or 2
The housing is
The inner chamber is formed in a bottomed cylindrical shape having a bottom portion closed at one end in the axial direction of the inner chamber and an opening portion open at the other end and covered with a lid,
The inclined surface is
A rotary damper characterized in that it is separated from an axis of the inner chamber from the bottom side toward the opening side.
In the rotary damper described in claim 3,
The fixed vane is
A rotary damper characterized in that side wall surfaces respectively facing the two inner chambers partitioned by the fixed vanes are formed to be inclined so that the thickness becomes thinner from the bottom side toward the opening side. .
The rotary damper according to any one of claims 1 to 4, wherein
The seal body is
The rotary damper characterized in that a surface facing the inclined surface is an inclined surface parallel to the inclined surface.