JP6020656B2 - Rotational speed reducer for truck tailgate - Google Patents

Description

  The present invention relates to a rotational speed reducer that can be suitably used to control the rotational speed of a tailgate of a truck.

  The tailgate hinged to the truck body is opened and closed when loading or unloading a load on the truck bed, and such opening and closing is usually performed manually.

JP 2004-323007 A JP2009-113511A

  By the way, when the tailgate is manually rotated to open the loading platform, if the tailgate suddenly rotates without resistance, the tailgate collides with a stopper that defines the closing position of the tailgate and generates a loud sound. On the other hand, when the tailgate is manually rotated to close the loading platform, if a large torque is required, it becomes difficult to close the loading platform. In addition, an appropriate resistance torque is required, and a rotation speed reduction device that generates such resistance torque must be installed in a narrow space where the tailgate is installed, and a large rotation speed reduction device is difficult to adopt.

  The present invention has been made in view of the above-mentioned points, and an object of the present invention is to bring the tailgate to the open position at a constant speed while suppressing rapid rotation of the track tailgate in the opening direction. It can generate a small resistance torque against the rotation of the truck's tailgate in the closing direction, and thus can bring the truck's tailgate to the closed position quickly with a small force and can be made compact. An object of the present invention is to provide an easy-to-use rotary reduction device for a tailgate of a truck.

  The rotational speed reducer for a tailgate of a track according to the present invention has a cylindrical inner peripheral surface and has an inner protrusion integrally formed on the inner peripheral surface that protrudes radially inward from the inner peripheral surface. A container having a cylindrical outer peripheral surface facing the inner peripheral surface of the container, and an outer protrusion integrally formed on the outer peripheral surface projecting radially outward from the outer peripheral surface. The rotating body is defined by a rotating body that is rotatably arranged inside the container, and an inner peripheral surface of the container, an outer peripheral surface of the rotating body, and side surfaces facing each other in the rotation direction of the inward projection. The viscous fluid accommodated in the internal space partitioned into the first and second two chambers by the outer projection of the first and second chambers is provided on the rotating body so as to communicate with each other. Rotation equivalent to the opening direction of the first and second passages and the tailgate of the truck In the rotation in one direction with respect to the container, the internal pressure of the viscous fluid in one of the two chambers increases by a certain level or more due to the rotation in the one direction, and the other of the two chambers One chamber from the other chamber in rotation in the other direction relative to the container of the rotating body corresponding to rotation in the closing direction of the tailgate of the track while allowing the flow of the viscous fluid through the first passage to the chamber of A first one-way valve disposed in the first passage and one chamber in rotation in one direction relative to the container of the rotating body so as to inhibit the flow of the viscous fluid through the first passage to the While prohibiting the flow of viscous fluid through the second passage to the other chamber, the viscous fluid through the second passage from the other chamber to the one chamber in rotation in the other direction with respect to the container of the rotating body Second passage to allow flow A first one-way valve, a valve seat formed on the rotating body, and a sphere seated on the valve seat and disposed inside the rotating body. And an elastic member that contacts the sphere at one end so as to elastically press the sphere toward the valve seat, and the second passage is at least one formed on the protruding edge of the outward projection. The second one-way valve has a valve body that is provided so as to be movable in the rotational direction at the protruding edge of the outer protrusion across the protruding edge of the outer protrusion. The valve body closes the notch in the rotation of the rotating body in one direction with respect to the container, and inhibits the flow of viscous fluid through the second passage from one chamber to the other chamber. Fully-closed piece disposed on one surface of the outer projection that receives the internal pressure of the viscous fluid in the chamber, and housing of the rotating body The internal pressure of the viscous fluid in the other chamber is adjusted so as to allow the viscous fluid to flow through the second passage from the other chamber to the one chamber by partially closing the notch in rotation in the other direction relative to the body. The incomplete closure piece disposed on the other surface of the outer projection to be received, and the container disposed on the projecting edge of the outer projection so as to connect the complete closure piece and the incomplete closure piece to each other A connecting portion that is slidably in contact with the inner peripheral surface and the protruding edge of the outer protrusion in the rotational direction.

  According to the rotational speed reducer for a track tailgate of the present invention, the internal pressure of the viscous fluid in one chamber is reduced in one direction of rotation relative to the container of the rotating body corresponding to rotation in the opening direction of the tailgate of the track. Regardless of the rise, the second one-way valve prohibits the flow of viscous fluid through the second passage from one chamber to the other, while the viscosity in one chamber due to rotation in that one direction. When the internal pressure of the fluid rises below a certain level, the first one-way valve prohibits the flow of viscous fluid through the second passage from one chamber to the other, resulting in the opening direction of the truck's tailgate. A resistance torque is generated corresponding to the amount of increase in the internal pressure of the viscous fluid with respect to the rotation of the rotating body in one direction relative to the container corresponding to the rotation. When the internal pressure rises above a certain level The first one-way valve permits the flow of viscous fluid through the second passage from one chamber to the other chamber, and as a result, the rotation of the tailgate of the track corresponds to the rotation body in the opening direction. A constant resistance torque is generated by suppressing further increase of the internal pressure of the viscous fluid with respect to the rotation in one direction, and thus, the rapid rotation of the truck tailgate is suppressed at a constant speed. The tailgate can be brought into the open position, and in the other direction of rotation of the rotating body relative to the closure of the truck's tailgate in the closing direction, regardless of the increase in the internal pressure of the viscous fluid in the other chamber, The first one-way valve prohibits the flow of the viscous fluid through the second passage from the other chamber to the one chamber, while the second one is the same regardless of the increase in the internal pressure of the viscous fluid in the other chamber. One way valve is the other A small resistance torque against rotation in the other direction relative to the container of the rotating body corresponding to the rotation in the closing direction of the tailgate of the track, as a result of allowing viscous fluid flow through the second passage from one to the other chamber Thus, the truck tailgate can be quickly brought to the closed position with a small force, and an easy-to-use rotary reduction device for the truck tailgate can be provided.

  In a preferred example, the container includes a cylindrical main body that defines the inner space and has the cylindrical inner peripheral surface integrally formed with the inner protrusion, and an axial direction of the cylindrical main body. A rotating body having a lid portion integrally provided at one end portion and a lid member attached to the other end portion in the axial direction of the cylindrical main body and having a through-hole in the center; Comprises a rotating body main body having the outer peripheral surface integrally formed with outward projections, and a cylindrical body fitted inside the rotating body main body. It is formed in the body main body and the cylindrical body, the spherical body is arranged in the hollow part of the cylindrical body, and the valve seat is formed in the cylindrical body.

  In the present invention, the inward projection is a projection main body integrally formed on the inner peripheral surface of the container, and covers the protruding end of the projection main body, and slides in the rotational direction on the outer peripheral surface of the rotary body. It is preferable to have a sealing member that freely contacts, and it is preferable that this sealing member also has wear resistance because the sealing performance can be maintained over a long period of time.

  In a preferred example of the present invention, the sphere is seated on the valve seat to close the first passage when receiving the internal pressure of the viscous fluid from the other chamber in the rotation in the other direction with respect to the container of the rotating body. The first passage so as to open the first passage away from the valve seat when receiving the internal pressure of the viscous fluid that has risen above a certain level from one chamber due to rotation in one direction relative to the container of the rotating body It is arranged in.

  When the fully closed piece receives the internal pressure of the viscous fluid from one chamber, it contacts one surface of the outward projection to close the notch, while the incompletely closed piece has the viscous fluid of the other chamber. When receiving the internal pressure, it is preferable that the incomplete closure piece part is separated from one surface of the outward projection by the movement of the connecting portion accompanying the movement of the outward projection to the other surface.

  In one example of the rotary speed reducer for the tailgate of the truck according to the present invention, the container is fixed to the vehicle body of the truck, and the rotary body is connected to the rotating shaft of the tailgate. However, instead of this, the housing body is connected to the rotating shaft of the tailgate, and the rotating body may be fixed to the vehicle body of the truck. When used for a truck tailgate, the rotational speed reducer of the present invention is preferably arranged in a truck tail lamp housing case.

  The viscous fluid is preferably 100 to 1,000,000 cst, more preferably 10,000 to 100,000 cst of silicone oil. In a preferred example, the container and the rotating body are made of aluminum, The valve body, the cylindrical body, and the seal member are made of synthetic resin, and the sphere is made of a steel ball.

  According to the present invention, it is possible to suppress the rapid opening direction of the tailgate of the truck and bring the tailgate to the opening position at a constant speed, and a small resistance torque against the closing direction of the truck tailgate. Thus, it is possible to provide a rotational speed reducer for a truck tailgate that can be formed in a small size while being able to quickly bring the truck tailgate to the closed position with a small force. it can.

FIG. 1 is a cross-sectional explanatory view taken along the line II of FIG. 2 showing an example of an embodiment of the present invention. 2 is a cross-sectional explanatory view taken along the line II-II in the example shown in FIG. FIG. 3 is a cross-sectional explanatory view taken along the line I-III shown in FIG. 4 is a cross-sectional explanatory view taken along the line IV-I shown in FIG. FIG. 5 is a cross-sectional explanatory view taken along line VI in FIG. FIG. 6 is a cross-sectional explanatory view taken along line I-VI shown in FIG. FIG. 7 is a left side explanatory view of the example shown in FIG. FIG. 8 is an explanatory diagram of the tailgate of the track. FIG. 9 is an explanatory diagram of the tailgate and the like of the track. FIG. 10 is an operation explanatory diagram of the example shown in FIG. FIG. 11 is an operation explanatory diagram of the example shown in FIG.

Next, embodiments of the present invention will be described in more detail based on preferred examples shown in the drawings. The present invention is not limited to these examples.

  1 to 7, a rotary speed reducing device 1 for a tailgate of a truck according to this embodiment has a cylindrical inner peripheral surface 2 and projects radially inward from the inner peripheral surface 2 to the inner peripheral surface 2. A housing 5 having inward projections 3 and 4 formed integrally therewith, and a cylindrical outer circumferential surface 6 facing the inner circumferential surface 2 of the housing 5 and radially outward from the outer circumferential surface 6. A rotating body 8 having outer protrusions 7a and 7b integrally formed on the outer peripheral surface 6 so as to protrude in the direction of rotation and arranged to be rotatable in the rotation direction R about the axis O inside the housing body 5. The inner surface 2 of the housing 5, the outer surface 6 of the rotating body 8 and the side surfaces 9 a and 10 a and 9 b and 10 b facing each other in the rotational direction R of the inner protrusions 3 and 4, and the rotating body 8. The outer projections 7a and 7b of the two chambers 11a and 12a and 11b and 12b Passages 15a, 16a and 15b provided in the rotating body 8 so that the viscous fluids 14a and 14b accommodated in the defined internal spaces 13a and 13b and the two chambers 11a and 12a and 11b and 12b communicate with each other. And 16b and the rotation in one direction R1 around the axis O with respect to the housing 5 of the rotating body 8 corresponding to the opening direction rotation of the tailgate 18 (see FIGS. 8 and 9) of the track 17 When the internal pressure of the viscous fluids 14a and 14b in one of the two chambers 11a and 12a and 11b and 12b of the two chambers 11a and 12b and rotation of the direction R1 rises above a certain level, While allowing the viscous fluids 14a and 14b to flow through the passages 15a and 15b to the other chambers 12a and 12b, The viscous fluid through the passages 15a and 15b from the chambers 12a and 12b to the chambers 11a and 11b in the rotation in the other direction R2 around the axis O with respect to the containing body 5 of the rotating body 8 corresponding to the rotation in the closing direction of the lugate 18. A one-way valve 19 arranged in the passages 15a and 15b so as to prohibit the flow of 14a and 14b, and a passage from the chambers 11a and 11b to the chambers 12a and 12b in the rotation in the direction R1 with respect to the housing 5 of the rotary body 8 While prohibiting the flow of the viscous fluids 14a and 14b through 16a and 16b, the viscous fluid 14a through the passages 16a and 16b from the chambers 12a and 12b to the chambers 11a and 11b in the rotation in the direction R2 of the rotating body 8 with respect to the container 5 And one-way valves 20a and 20b disposed in the passages 16a and 16b to allow the flow of It has.

  Since the internal space 13a side and the internal space 13b side are configured in the same manner, the internal space 13a side will be described below, and for the internal space 13b side, the corresponding configuration is denoted by b and necessary. A description will be given accordingly.

  The container 5 has a cylindrical main body 31 having a cylindrical inner peripheral surface 2 that defines internal spaces 13a and 13b and in which inner protrusions 3 and 4 are integrally formed, and an axial direction A of the cylindrical main body 31. A lid portion 33 provided integrally with one end portion 32 and a flange portion 34 at the other end portion in the axial direction A of the cylindrical main body 31 are attached via a plurality of rivets 35 and at the center. A lid member 37 having a through hole 36, an anti-rotation plate portion 39 provided integrally on the outer peripheral surface 38 of the cylindrical body 31, and an outer peripheral surface 40 of the flange portion 34 are provided integrally. A mounting portion 42 having a hole 41; a positioning projection 43 provided integrally on the outer peripheral surface 40 of the flange portion 34; and a cylindrical bearing portion 45 provided integrally on the inner side surface 44 of the lid portion 33; Such a container 5 is inserted into the through hole 41 of the mounting portion 42. It is adapted to be secured to the vehicle body 46 of the track 17 through a bolt or the like to be.

  Each of the inward protrusions 3 and 4 is covered with a protrusion main body 51 integrally formed on the inner peripheral surface 2 of the cylindrical main body 31 of the container 5 and a protruding end 52 of the protrusion main body 51 and is rotated. A seal member 53 having a U-shaped cross section that is slidably in contact with the outer peripheral surface 6 of the body 8 in the rotation direction R is provided.

  The rotating body 8 has an outer peripheral surface 6 with outer protrusions 7a and 7b integrally formed, and a bottomed hole 62 with a detent for receiving the rotation shaft 61 of the tailgate 18 of the track 17 at one end surface 63. And a rotating body main body 64, and a bottomed hole 66 opened at the other end face 65 of the rotating body main body 64. The composite body is fitted and fixed inside the rotating body main body 64 and has a hollow portion 67. A cylindrical shaft portion 69 formed integrally with the resin-made cylindrical body 68 and the other end surface 65 of the rotating body main body 64 and surrounding the bearing portion 45 and rotatably supported by the bearing portion 45 in the rotation direction R. It is equipped with.

  Seal rings 71, 72, and 73 that prevent the viscous fluids 14 a and 14 b from leaking are disposed between the container 5 and the rotating body 8. The rotating body 8, on the other hand, has a cylindrical shaft portion 69. The bearing portion 45 is supported so as to be rotatable in the rotational direction R, and on the other hand, is supported by the container 5 so as to be rotatable in the rotational direction R via a bushed bush bearing 74 disposed between the lid member 37 and the lid member 37. Yes.

  The one-way valve 19 shared with the passages 15a and 16a and 15b and 16b is a valve seat 81 formed on the cylindrical body 68 of the rotating body 8, and is seated on the valve seat 81 and inside the rotating body 8. A sphere 83 made of a steel ball movably disposed in the hollow portion 67 of the cylindrical body 68, and the other end 85 comes into contact with the sphere 83 at one end 84 so as to elastically press the sphere 83 toward the valve seat 81. Then, it has the coil spring 86 as an elastic member which contacts the inner surface 44 of the cover part 33. FIG.

  As the viscous fluid 14a accommodated in the internal space 13a, 100 to 1,000,000 cst, preferably 10,000 to 100,000 cst silicone oil is used, and in one embodiment, 10,000 cst silicone oil is used. Is done.

  The passage 15a formed in the rotating body 64 and the cylindrical body 68 is opened to the chamber 11a at one end, is defined by the outer surface of the cylindrical body 68 and is formed in the rotating body main body 64, and the passage 91a at one end. The through hole 92 defined by the valve seat 81, the hollow portion 67, and the slit formed in the cylindrical body 68 at one end and communicated with the hollow portion 67 so as to communicate with the hollow portion 67 at the other end. 93a, one end communicating with the slit 93a, and the other end opening into the chamber 12a and a slit 94a formed in the rotating body 64 and the cylindrical shaft portion 69, to the chamber 12a of the slit 94a. The open end 95a at the other end is closed by the seal member 53 of the inward projection 3 at a position where the rotary body 8 is fully rotated in the direction R2 (rotation position shown in FIG. 2). 92 and Check unit 67 is shared by a passage 15a and the passage 15b.

  Thus, the spherical body 83 sits on the valve seat 81 and closes the passage 15a when receiving the internal pressure of the viscous fluid 14a from the chamber 12a in the rotation in the direction R2 of the rotating body 8 with respect to the containing body 5, while the passage 15a is closed. When receiving the internal pressure of the viscous fluid 14a that has risen above a certain level from the chamber 11a due to the rotation of the body 8 with respect to the container 5, the passage 15a leaves the valve seat 81 and opens the through hole 92 in the passage 15a. It is arranged in.

  The one-way valve 20a for opening and closing the passage 16a having at least one, in this example, two notches 97a, formed on the protruding edge 96a of the outer protrusion 7a has the protruding edge 96a of the outer protrusion 7a. A valve body 98a is provided so as to be movable in the rotational direction R on the projecting edge 96a of the outer projection 7a.

  The valve body 98a closes each notch 97a in the rotation of the rotating body 8 with respect to the container 5 in the direction R1, and inhibits the flow of the viscous fluid 14a through the passage 16a from the chamber 11a to the chamber 12a. A completely closed piece 102a disposed on one surface 101a of the outward projection 7a that receives the internal pressure of the viscous fluid 14a, and a notch 97a partially closed in the rotation of the rotating body 8 in the direction R2 with respect to the housing 5 An incompletely closed piece 104a disposed on the other surface 103a of the outward projection 7a that receives the internal pressure of the viscous fluid 14a in the chamber 12a so as to allow the viscous fluid 14a to flow through the passage 16a from the 12a to the chamber 11a. And the fully closed piece portion 102a and the incompletely closed piece portion 104a are arranged on the protruding edge 96a of the outward projection 7a and connected to the inner peripheral surface 2 and And it includes a connecting portion 105a which is slidably contacted with the protruding edge 96a of the outer projections 7a in the rotational direction R.

  When the completely closed piece 102a receives the internal pressure of the viscous fluid 14a from the chamber 11a, it contacts the one surface 101a of the outward projection 7a to close each notch 97a, while the incompletely closed piece 104a When receiving the internal pressure of the viscous fluid 14a of 12a, the movement of the connecting portion 105a accompanying the movement of the outer projection 7a of the incompletely closed piece 104a to the other surface 103a separates from the surface 101a of the outer projection 7a. A gap 106a is formed between the surface 101a (see FIG. 11).

  For example, in the truck 17 shown in FIGS. 8 and 9, the container 5 is mounted on the vehicle body 46 via a bolt or the like inserted into the through hole 41 of the mounting portion 42. Further, the rotation position in the rotation direction R is positioned with respect to the vehicle body 46 by the positioning projection 43, while the rotation prevention plate portion 39 is fixed to the vehicle body 46 so as not to rotate in the rotation direction R. The rotating body 8 is connected to the rotating shaft 61 of the tailgate 18 fitted into the bottomed hole 62 at one end, and is disposed and used in the tail lamp housing case 110.

  In the rotary reduction device 1 for a tailgate in which the container 5 is fixed to the vehicle body 46 of the truck 17 and the rotating body 8 is connected to the rotating shaft 61 and disposed in the container case 110, the loading platform 111 of the truck 17 is tailed. In the state closed by the gate 18 (the state shown in FIG. 8), the outward projection 7a is arranged as shown in FIG. 2 so that the chamber 11a has the maximum volume while the chamber 12a has the minimum volume. The rotating body 8 is rotated, the sphere 83 is seated on the valve seat 81, and the one-way valve 19 closes the passage 15a. In this state, the tailgate 18 that closes the loading platform 111 of the truck 17 is replaced with the loading platform. When it is manually rotated in the direction R1 in order to open 111, the outer protrusion 7a of the rotating body 8 is also rotated in the direction R1, and this rotation makes contact by contact of the connecting portion 105a with the inner peripheral surface 2 of the container 5. Resistance and chamber Due to the internal pressure of the viscous fluid 14a of 1a, the valve body 98a is moved in the direction R2 relative to the outward projection 7a, and the completely closed piece 102a contacts the surface 101a of the outward projection 7a, thereby removing the notch 97a. As shown in FIG. 10, the valve body 98a is completely closed, and as a result of closing the passage 16a, the internal pressure of the viscous fluid 14a in the chamber 11a increases as the volume of the chamber 11a decreases, and the internal pressure of the viscous fluid 14a increases. The resistance torque is generated with respect to the rotation of the rotating body 8 in the direction R1 corresponding to the rising amount of the rotating body 8, and braking is applied to the rotation of the tailgate 18 in the direction R1 that opens the loading platform 111. While the rotation in the abrupt direction R1 is prevented, when the internal pressure of the viscous fluid 14a in the chamber 11a rises above a certain level as the volume of the chamber 11a decreases, the sphere 83 moves against the elastic force of the coil spring 86. Seat 8 The one-way valve 19 opens the passage 15a, and the viscous fluid 14a in the chamber 11a flows into the chamber 12a through the passage 15a, so that the viscous fluid in the chamber 11a decreases as the volume of the chamber 11a decreases. After the increase in the internal pressure of 14a is stopped and the internal pressure of the viscous fluid 14a in the chamber 11a increases more than a certain level, the increase in resistance torque with respect to the rotation of the rotating body 8 in the direction R1 is suppressed, and the tailgate 18 A constant braking is applied to the rotation in the direction R1 for opening the loading platform 111, and the tailgate 18 is brought into a state in which the loading platform 111 of the track 17 is opened (the state shown in FIG. 9). In a state where the gate 18 opens the loading platform 111 of the truck 17 (the state shown in FIG. 9), the outward projection 7a is arranged so that the chamber 11a has the minimum volume while the chamber 12a has the maximum volume. The rotating body 8 is rotated so that the sphere 83 is seated on the valve seat 81 and the one-way valve 19 closes the passage 15a. In this state, the tailgate 18 that opens the loading platform 111 of the truck 17 is provided. Is rotated in the direction R2 so as to close the loading platform 111, the outer protrusion 7a of the rotating body 8 is also rotated in the direction R2, and this rotation causes contact of the connecting portion 105a with the inner peripheral surface 2 of the container 5. Due to the contact resistance and the internal pressure of the viscous fluid 14a in the chamber 12a, the valve body 98a is moved in the direction R1 relative to the outward projection 7a, and the incompletely closed piece 104a contacts the surface 103a of the outward projection 7a. On the other hand, the completely closed piece 102a is separated from the surface 101a of the outward projection 7a, and a gap 106a is formed between the completely closed piece 102a and the surface 103a of the outward projection 7a, thereby opening the notch 97a and the valve body. 98a is shown in FIG. As described above, as a result of opening the passage 16a formed by the notches 97a, the viscous fluid 14a in the chamber 12a easily flows into the chamber 11a through the passage 16a and the gap 106a, and the volume of the chamber 12a decreases. The tailgate 18 closes the loading platform 111 of the truck 17 with little increase in the internal pressure of the viscous fluid 14a in the chamber 12a and little braking against the rotation of the tailgate 18 in the direction R2 for closing the loading platform 111. To the state (the state shown in FIG. 8).

  As described above, according to the rotation reduction device 1 for the tailgate of the track, in the rotation in the direction R1 of the rotating body 8 with respect to the container 5 corresponding to the rotation of the tailgate 18 of the track 17 in the opening direction, Regardless of the increase in the internal pressure of the viscous fluid 14a of 11a, the one-way valve 20a prohibits the flow of the viscous fluid 14a through the passage 16a from the chamber 11a to the chamber 12a, while in the chamber 11a due to the rotation in the direction R1. When the internal pressure of the viscous fluid 14a rises below a certain level, the one-way valve 19 prohibits the flow of the viscous fluid 14a through the passage 15a from the chamber 11a to the chamber 12a. As a result, the tail gate 18 of the track 17 rotates in the opening direction. Corresponding to the amount of increase in the internal pressure of the viscous fluid 14a in the chamber 11a with respect to the rotation in the direction R1 of the rotating body 8 with respect to the container 5 corresponding to When the internal pressure of the viscous fluid 14a in the chamber 11a rises above a certain level due to the rotation in the direction R1, the one-way valve 19 allows the viscous fluid 14a to flow through the passage 15a from the chamber 11a to the chamber 12a. A constant resistance torque is obtained by suppressing further increase in the internal pressure of the viscous fluid 14a in the chamber 11a with respect to the rotation in the direction R1 of the rotating body 8 with respect to the container 5 corresponding to the rotation of the 17 tailgate 18 in the opening direction. Therefore, the tail gate 18 of the track 17 can be brought to the open position at a constant speed by suppressing the rapid rotation of the tail gate 18 of the track 17 and the rotation of the tail gate 18 of the track 17 in the closing direction. In the rotation in the direction R2 of the rotating body 8 corresponding to the container 5 with respect to the container 5, regardless of the increase in the internal pressure of the viscous fluid 14a in the chamber 12a, the one-way valve 19 While the flow of the viscous fluid through the passage 15a to the chamber 11a is prohibited, the one-way valve 20a is similarly used for the viscosity via the passage 16a from the chamber 12a to the chamber 11a regardless of the increase in the internal pressure of the viscous fluid 14a in the chamber 12a. As a result of allowing the flow of the fluid 14a, a small resistance torque is generated with respect to the rotation in the direction R2 of the rotating body 8 with respect to the containing body 5 corresponding to the rotation of the tail gate 18 of the track 17 in the closing direction. The 17 tailgates 18 can be rapidly brought to the closed position with a small force, and the tailgate 18 of the track 17 can be provided with ease of use.

  The above operation is similarly performed on the internal space 13b side.

  In the rotary reduction device 1 for the tailgate of the track in the above example, the two inner spaces 13a and 13b are formed by the inner protrusions 3 and 4. However, in the present invention, one inner protrusion defines one inner space. The one internal space may be divided into two chambers by one outward projection, and further, three or more internal spaces are formed by three or more inward projections. You may partition into two chambers by an outward protrusion.

DESCRIPTION OF SYMBOLS 1 Rotation speed reducer 2 Inner peripheral surface 3, 4 Inner protrusion 5 Container 6 Outer peripheral surface 7a, 7b Outer protrusion 8 Rotating body 9a, 9b, 10a, 10b Side surface 11a, 11b, 12a, 12b Chamber 13a, 13b Internal space 14a, 14b Viscous fluid 15a, 15b, 16a, 16b Passage 17 Track 18 Tailgate 19 One-way valve

Claims (14)

A container having an inner protrusion, a rotating body having an outer protrusion and rotatably disposed inside the container, and a viscous fluid housed in an internal space between the container and the rotating body; In this internal space, a passage that communicates the first and second chambers defined by the inner protrusion and the outer protrusion with each other, and a rotating body container that corresponds to rotation in the opening direction of the tailgate of the track. A certain increase in the internal pressure of the viscous fluid in one chamber due to rotation in one direction allows the viscous fluid to flow through the passage from this chamber to the other chamber, while closing the tailgate of the truck Tailgate of a truck comprising a one-way valve for inhibiting the flow of viscous fluid through a passage from one chamber to the other in rotation in the other direction relative to the container of the rotating body corresponding to rotation in the direction Rotational speed reducer.   The container body is provided integrally with a cylindrical main body having an inner peripheral surface defining the internal space and integrally formed with an inward projection, and one end of the cylindrical main body in the axial direction. The rotational speed reduction for the tailgate of a truck according to claim 1, further comprising a lid and a lid member attached to the other axial end of the cylindrical main body and having a through hole in the center. apparatus.   The inward protrusion is a protrusion body integrally formed on the inner peripheral surface of the cylindrical main body, and a seal member that covers the protruding end of the protrusion body and contacts the rotating body slidably in the rotation direction. The rotary speed reducer for a truck tailgate according to claim 2.   The track tail according to any one of claims 1 to 3, wherein the rotating body has an outer peripheral surface defining the inner space, and the outer protrusion is integrally formed on the outer peripheral surface. Rotational speed reducer for gate.   The rotary speed reducer for a truck tailgate according to any one of claims 1 to 4, wherein the passage includes first and second passages provided in the rotating body.   In the one-way valve, the rotation of the rotating body in one direction relative to the opening of the truck tailgate in the opening direction of the track causes the viscous fluid in one of the two chambers to rotate in the one direction. A container for a rotating body corresponding to rotation of the tailgate of the truck in the closing direction while allowing the viscous fluid to flow through the first passage from the one chamber to the other chamber when the internal pressure rises above a certain level. Having a first one-way valve disposed in the first passage so as to inhibit the flow of viscous fluid through the first passage from the other chamber to the one chamber in rotation in the other direction with respect to 6. The rotary speed reducer for a truck tailgate according to claim 5.   The first one-way valve has a valve seat formed on the rotating body, a sphere seated on the valve seat and disposed inside the rotating body, and elastically pressing the sphere toward the valve seat. The rotary speed reducing device for a tailgate of a truck according to claim 6, further comprising an elastic member that contacts the sphere at one end.   When the spherical body receives the internal pressure of the viscous fluid from the other chamber in rotation in the other direction with respect to the rotating body container, the spherical body sits on the valve seat and closes the first passage, The first passage is arranged so as to open the first passage away from the valve seat when receiving an internal pressure of the viscous fluid that has risen above a certain level from one chamber due to rotation in one direction. A rotational speed reducer for a truck tailgate according to claim 7.   The rotating body includes a rotating body main body and a cylindrical body fitted inside the rotating body main body. The first passage is formed in the rotating body main body and the cylindrical body. The rotary speed reducer for a truck tailgate according to claim 7 or 8, wherein the rotary seat is disposed in a hollow portion of the cylindrical body, and the valve seat is formed in the cylindrical body.   The one-way valve prohibits the flow of viscous fluid through the second passage from one chamber to the other chamber in one direction of rotation of the rotating body relative to the container, while the other direction of the rotating body relative to the container 6. A second one-way valve disposed in the second passage so as to allow the flow of the viscous fluid through the second passage from the other chamber to the one chamber in the rotation of the second passage. The rotational speed reducer for the tailgate of the truck according to any one of claims 1 to 9.   The second passage has at least one notch formed on the protruding edge of the outer protrusion, and the second one-way valve extends over the protruding edge of the outer protrusion. The valve body is provided at the edge so as to be movable with respect to the rotation direction. The valve body closes the notch in rotation in one direction with respect to the container of the rotation body, and moves from one chamber to the other chamber. A completely closed piece disposed on one surface of the outward projection receiving the internal pressure of the viscous fluid in one chamber so as to inhibit the flow of the viscous fluid through the second passage; The outer pressure receiving the internal pressure of the viscous fluid in the other chamber so as to partially block the notch and allow the fluid to flow through the second passage from the other chamber to the one chamber in rotation in the direction of An incomplete closing piece disposed on the other surface of the projection, a complete closing piece and an incomplete A connecting portion that is arranged on the protruding edge of the outer protrusion and is in contact with the protruding body of the outer protrusion and the protruding edge of the outer protrusion so as to be slidable in the rotational direction so as to connect the closing pieces to each other; The rotary speed reducer for a truck tailgate according to claim 10.   When the fully closed piece receives the internal pressure of the viscous fluid from one chamber, it contacts one surface of the outward projection to close the notch, while the incompletely closed piece has the viscous fluid of the other chamber. 12. The method according to claim 11, wherein when receiving the internal pressure, the connection portion is moved away from the one surface of the outer protrusion due to the movement of the outer protrusion of the incompletely closed piece portion to the other surface. Rotational speed reducer for truck tailgate.   The truck body according to any one of claims 1 to 12, wherein the housing body is fixed to a vehicle body of the truck, and the rotating body is coupled to a rotating shaft of the tailgate. Rotational speed reducer for tailgate.   The rotary speed reducer for a truck tailgate according to any one of claims 1 to 13, wherein the viscous fluid has 100 to 1,000,000 cst of silicone oil.

Images