JP6215768B2 - Paper damper, assembly tool, and assembly method of paper damper - Google Patents

Description

  The present invention relates to a paper damper, an assembling tool, and an assembling method of a paper damper.

  In general, in a rear-wheel drive or four-wheel drive vehicle, power from a transmission mounted on the front of the vehicle is transmitted to the left and right rear wheels via a propeller shaft disposed at the lower part of the vehicle. It is transmitted to a final reduction gear provided between them.

  The propulsion shaft described above is constituted by a hollow tube. In such a propulsion shaft, in order to prevent the propulsion shaft from resonating with the high-frequency sound generated by the gear meshing sound generated by the transmission or the final reduction gear, a paper damper wound with cardboard is inserted into the propulsion shaft. Yes.

As a method for fixing the paper damper in the propulsion shaft, the holding members inserted at both ends of the paper damper are expanded in the propulsion shaft, thereby pressing the both ends of the paper damper against the inner peripheral surface of the propulsion shaft. (For example, refer to Patent Document 1).
In addition, as another method of fixing the paper damper in the propulsion shaft, there is a method in which the outer peripheral surface of the paper damper is bonded to the inner peripheral surface of the propulsion shaft with an adhesive (for example, see Patent Document 2).

Japanese Patent Laid-Open No. 1-148621 Japanese Utility Model Publication No. 7-16021

As described above, the method of fixing the paper damper in the propulsion shaft using the holding member has a problem that the number of parts increases and the number of assembling steps increases.
Further, in the method of fixing the paper damper in the propulsion shaft using the adhesive, it is necessary to work so that the adhesive does not adhere to other parts, and there is a problem that the assembling work becomes complicated.

  An object of the present invention is to solve the above-described problems and provide a paper damper, an assembly tool for the paper damper, and an assembly method for the paper damper that can be easily and reliably fixed in a hollow tube.

  In order to solve the above problems, the present invention is a paper damper that is inserted into a hollow tube, and is composed of a tubular body in which cardboard is wound into a tubular shape. The cylindrical body includes a spiral peripheral wall portion and a radial wall portion extending in a radial direction of the peripheral wall portion from an inner peripheral edge of the peripheral wall portion. And the length from the front-end | tip part of the said radial direction wall part to a base end part is formed larger than the internal diameter of the said surrounding wall part in the state inserted in the said hollow tube.

  In this configuration, when the paper damper is inserted into the hollow tube, the radial wall portion is disposed so as to pass through the substantially central position of the hollow tube. Since the radial wall portion is larger than the inner diameter of the peripheral wall portion inserted in the hollow tube, both end portions of the radial wall portion are pressed against the inner peripheral surface of the peripheral wall portion, and the radial wall portion is bent in the peripheral wall portion. It becomes a state of being stuck or compressed. And when the urging | biasing force acts on the internal peripheral surface of a peripheral wall part from a radial direction wall part, the outer peripheral surface of a peripheral wall part is pressed on the internal peripheral surface of a hollow tube. In this way, the paper damper can be easily and reliably fixed in the hollow tube only by inserting the paper damper into the hollow tube.

  Moreover, the radial direction wall part is pressed against the inner peripheral surface of the peripheral wall part, so that the outer peripheral surface of the peripheral wall part can be kept in close contact with the inner peripheral surface of the hollow tube. Therefore, it is possible to prevent the peripheral wall portion from being reduced in diameter due to secular change, and to prevent the outer peripheral surface of the peripheral wall portion from being separated from the inner peripheral surface of the hollow tube, and it is possible to prevent a reduction in vibration isolation performance. In addition, the paper damper can be prevented from moving in the axial direction in the hollow tube, and the weight balance of the hollow tube can be maintained.

  In the paper damper, the tubular body is formed with a bent portion obtained by bending a part of the radial wall portion, and the length from the distal end portion to the proximal end portion of the bent portion is set in the hollow tube. You may form larger than the radius of the inner periphery of the said surrounding wall part of the inserted state.

  In this configuration, since the outer peripheral surface of the peripheral wall portion is pressed against the inner peripheral surface of the hollow tube from three directions, the paper damper can be more reliably fixed in the hollow tube.

  The present invention is an assembling tool for assembling the paper damper described above into the hollow tube, and has a cylindrical main body. A slit extending in the axial direction is opened on the outer peripheral surface of the main body portion, and the slit is opened on a front end surface of the main body portion. The edge of the cardboard is inserted into the slit, and the cardboard is wound around the outer peripheral surface of the main body.

  In this configuration, the paper damper can be easily formed using the assembly tool. Further, by inserting the paper damper together with the assembly tool into the hollow tube and pulling out only the assembly tool from the hollow tube, the paper damper can be easily and reliably fixed in the hollow tube.

It is preferable that the slit is curved and the length from the bottom surface of the slit to the opening is formed larger than the inner diameter of the peripheral wall portion inserted into the hollow tube.
In this configuration, when one edge of the cardboard is inserted into the slit and the one edge is in contact with the bottom surface of the slit and the cardboard is bent at the opening edge of the slit, the tip of the radial wall The length from the base portion to the base end portion is larger than the inner diameter of the peripheral wall portion inserted in the hollow tube. Thus, the radial direction wall part can be formed easily.

  The present invention is an assembling method of a paper damper using the above assembling tool. And inserting the edge of the cardboard into the slit, and bending the cardboard along the outer peripheral surface of the main body at the opening of the slit to form the radial wall, and the cardboard Is wound around the outer peripheral surface of the main body portion to form the peripheral wall portion. Further, in a state where the paper damper is wound around the main body, the step of inserting the assembly tool into the hollow tube from the front end surface side, and the step of extracting the assembly tool in the hollow tube from the base end surface side; It has.

  In this configuration, the paper damper can be easily formed using the assembly tool, and the paper damper can be easily and reliably fixed in the hollow tube using the assembly tool.

In the paper damper of the present invention, the paper damper can be easily and reliably fixed in the hollow tube only by inserting the paper damper into the hollow tube, so that the working efficiency can be improved. In addition, it is possible to prevent the vibration-proof performance from deteriorating due to aging of the paper damper, and to maintain the weight balance of the hollow tube.
In the assembling tool and the method of assembling the paper damper according to the present invention, the paper damper can be easily formed using the assembling tool, and the paper damper can be easily and reliably fixed in the hollow tube using the assembling tool. it can.

It is the whole block diagram which showed the propulsion shaft of 1st embodiment. It is the perspective view which showed the paper damper of 1st embodiment. It is the figure which showed the paper damper of 1st embodiment, (a) is a front view before inserting in a propulsion shaft, (b) is a front view of the state inserted in the propulsion shaft. It is the figure which showed the assembly tool of 1st embodiment, (a) is a perspective view, (b) is the front view which showed the step which winds cardboard around an assembly tool. It is a figure showing each step of assembling the paper damper of the first embodiment to the propulsion shaft, (a) is a cross-sectional plan view of the step of inserting the assembly tool into the propulsion shaft, (b) is the assembly tool as the propulsion shaft FIG. 6C is a plan sectional view of the stage where the assembly tool is pulled out from the propulsion shaft. It is the perspective view which showed the paper damper of 2nd embodiment. It is the figure which showed the paper damper of 2nd embodiment, (a) is a front view before inserting in a propulsion shaft, (b) is a front view of the state inserted in the propulsion shaft.

(First embodiment)
A first embodiment of the present invention will be described in detail with reference to the drawings as appropriate.
In the first embodiment, a case where the paper damper of the present invention is used for a propulsion shaft (propeller shaft) of an automobile will be described as an example.
In the following description, the overall configuration of the propulsion shaft will be described first, and then the paper damper will be described in detail.

  As shown in FIG. 1, the propulsion shaft 1 extends in the front-rear direction of the vehicle. The propulsion shaft 1 transmits power from a transmission (not shown) mounted at the front of the vehicle body to a final reduction gear (not shown) provided between the left and right rear wheels.

The propulsion shaft 1 includes a first propulsion shaft 3 near the front of the vehicle, a second propulsion shaft 4 near the rear of the vehicle, and a constant velocity joint 6 that connects the first propulsion shaft 3 and the second propulsion shaft 4. ing. The propulsion shaft 1 has a two-piece structure (two-divided structure) composed of two propulsion shafts 3 and 4.
Further, a substantially intermediate portion of the propulsion shaft 1 in the axial direction is supported by the bearing structure 8 so as to be rotatable around the axis at the lower portion of the vehicle body.

  The first propulsion shaft 3 is a metal hollow tube. The front end portion of the first propulsion shaft 3 is connected to a transmission (not shown) via the first joint 5. The rear end portion of the first propulsion shaft 3 is connected to the constant velocity joint 6. The first joint 5 is a cross shaft joint and is connected to the transmission and the first propulsion shaft 3, respectively.

  The second propulsion shaft 4 is a metal hollow tube. A connecting shaft portion 4 a that is connected to the constant velocity joint 6 projects from the front end surface of the second propulsion shaft 4. The rear end portion of the second propulsion shaft 4 is connected to a final reduction gear (not shown) via a second joint 7. The second joint 7 is a cross shaft joint and is connected to the final reduction gear and the second propulsion shaft 4.

The constant velocity joint 6 is a sliding joint that connects the first propulsion shaft 3 and the second propulsion shaft 4. The constant velocity joint 6 includes an outer ring member 6 a connected to the first propulsion shaft 3 and a power transmission member 6 b (inner ring member) provided on the connection shaft portion 4 a of the second propulsion shaft 4. Thus, the constant velocity joint 6 of the first embodiment is a tripod type. As the constant velocity joint, a double offset type, a Lebro type, or the like can be used.
Further, the first propulsion shaft 3 and the second propulsion shaft 4 are not connected by a constant velocity joint, and the first propulsion shaft 3 and the second propulsion shaft 4 are connected to each other using a cross shaft joint similar to the first joint 5 and the second joint 7. The two propulsion shafts 4 may be connected.

The outer ring member 6a is a bottomed cylindrical metal part whose front side is closed. The rear end portion of the first propulsion shaft 3 is joined to the bottom portion of the outer ring member 6a.
The connecting shaft portion 4a is inserted into the rear end opening of the outer ring member 6a, and the outer ring member 6a and the power transmission member 6b move relative to each other.

  The bearing structure 8 is externally fitted to the bearing 8a that is externally fitted to the connecting shaft portion 4a of the second propulsion shaft 4, the rubber vibration-proof member 8b that is externally fitted to the bearing 8a, and the vibration-proof member 8b. And a bracket 8c attached to the lower part of the vehicle body.

  Cylindrical paper dampers 10A and 10A are inserted into the first propulsion shaft 3 and the second propulsion shaft 4, respectively. The paper damper 10A prevents the first propulsion shaft 3 and the second propulsion shaft 4 from resonating with a high-frequency sound generated by the gear meshing sound generated by the transmission or the final reduction gear.

  The two paper dampers 10A and 10A inserted into the propulsion shaft 1 have the same configuration except that the lengths in the axial direction are different. Therefore, in the following description, the paper damper 10A inserted into the first propulsion shaft 3 will be described, and the description of the paper damper 10A inserted into the second propulsion shaft 4 will be omitted.

As shown in FIG. 2, the paper damper 10 </ b> A is a cylindrical body 20 in which cardboard P (paperboard) is wound in a cylindrical shape, and includes a spiral peripheral wall portion 11 and an inner peripheral edge 11 a of the peripheral wall portion 11. And a radial wall portion 12 extending in the radial direction of the peripheral wall portion 11.
The axial length of the paper damper 10A is formed to be smaller than the axial length of the hollow portion of the first propulsion shaft 3, as shown in FIG.

  Note that the thickness of the cardboard P used for the paper damper 10A is thinner than the thickness of the steel pipe portion of the first propulsion shaft 3. In each drawing of the present embodiment, the thickness of the thick paper P is appropriately exaggerated in order to easily explain the configuration of the paper damper 10A.

As shown in FIG. 2, the peripheral wall portion 11 is a portion where the thick paper P is spirally wound around the axis of the paper damper 10 </ b> A three times.
The outer diameter of the peripheral wall portion 11 is such that the outer peripheral surface of the peripheral wall portion 11 is the inner peripheral surface of the first propulsion shaft 3 in a state where the paper damper 10A is inserted into the first propulsion shaft 3 as shown in FIG. It is set to be in close contact with.

  As shown in FIG. 3A, the radial wall portion 12 is a portion where the thick paper P is bent in the radial direction of the peripheral wall portion 11 at the edge portion 11 a on the inner peripheral side of the peripheral wall portion 11. As shown in FIG. 2, the radial wall portion 12 passes through the center position of the peripheral wall portion 11 and is disposed in the radial direction of the peripheral wall portion 11. Further, the radial wall portion 12 is formed across both end portions of the peripheral wall portion 11 in the axial direction. Thus, the peripheral wall portion 11 is wound around the radial wall portion 12.

As shown in FIG. 3A, the length L2 from the distal end portion 12a to the proximal end portion 12b of the radial wall portion 12 (the radial length of the peripheral wall portion 11) is the inner diameter L1 of the first propulsion shaft 3. It is formed slightly larger than (see FIG. 3B).
Therefore, as shown in FIG. 3B, in a state where the paper damper 10 </ b> A is inserted into the first propulsion shaft 3, both end portions 12 a and 12 b of the radial wall portion 12 are pressed against the inner peripheral surface of the peripheral wall portion 11. The radial wall portion 12 is bent or compressed in the peripheral wall portion 11. Thereby, a biasing force acts on the inner peripheral surface of the peripheral wall portion 11 from the radial wall portion 12.

  Next, the assembly tool 30 for forming the paper damper 10A and inserting the paper damper 10A into the first propulsion shaft 3 will be described.

As shown in FIG. 4A, the assembly tool 30 has a columnar main body 31.
The outer peripheral surface of the main body 31 is a part around which the peripheral wall 11 is wound. The outer diameter of the main body portion 31 is formed smaller than the inner diameter of the first propulsion shaft 3, and the assembly tool 30 is placed in the first propulsion shaft 3 in a state where the peripheral wall portion 11 is wound around the outer peripheral surface of the main body portion 31. (See FIG. 5B).
The base end surface 31b of the main body 31 is provided with a grip portion 31c for the operator to grip.

A slit 32 extending in the axial direction is opened on the outer peripheral surface of the main body 31. The slit 32 is a part into which the radial wall 12 (see FIG. 4B) is inserted.
Both end portions of the slit 32 in the axial direction are open to the distal end surface 31 a and the proximal end surface 31 b of the main body portion 31. In addition, the opening width of the slit 32 (the width in the circumferential direction of the main body 31) is formed in a size that allows the thick paper P to be inserted as shown in FIG.

  The slit 32 is curved in a direction orthogonal to the depth direction. And the length L5 from the bottom face 32a of the slit 32 to the opening part 32b is formed larger than the internal diameter L1 of the 1st propulsion shaft 3 (refer FIG.3 (b)).

  Next, an assembly method for fixing the paper damper 10 </ b> A in the first propulsion shaft 3 using the assembly tool 30 described above will be described.

  First, as shown in FIG. 4B, one edge of the thick paper P is inserted into the slit 32 of the assembly tool 30, and the one edge of the thick paper P is brought into contact with the bottom surface 32 a of the slit 32. In this state, the other edge side portion of the thick paper P is bent along the outer peripheral surface of the main body 31 at the opening 32 b of the slit 32. Accordingly, the radial wall portion 12 is formed by the thick paper P inserted into the slit 32.

  A length L5 from the bottom surface 32a of the slit 32 to the opening 32b is formed larger than the inner diameter L1 of the first propulsion shaft 3 (see FIG. 3B). Accordingly, the radial wall portion 12 formed in the slit 32 has a length L2 (see 3 (a)) from the distal end portion 12a to the proximal end portion 12b larger than the inner diameter L1 of the first propulsion shaft 3.

  Subsequently, the cardboard P is wound around the outer peripheral surface of the main body 31 to form a spiral peripheral wall 11 (see FIG. 3A). As a result, as shown in FIG. 5A, the paper damper 10 </ b> A is wound around the main body 31 of the assembly tool 30.

  Then, with the paper damper 10A wound around the main body 31, the assembly tool 30 is inserted into the first propulsion shaft 3 from the front end surface 31a side of the main body 31, as shown in FIG. The assembly tool 30 and the paper damper 10A are arranged in the first propulsion shaft 3. As a result, the outer peripheral surface of the peripheral wall portion 11 comes into contact with the inner peripheral surface of the first propulsion shaft 3.

  Subsequently, as shown in FIG. 5C, the assembly tool 30 in the first propulsion shaft 3 is pulled out from the base end face 31 b side of the main body 31. At this time, the paper damper 10A is held in the first propulsion shaft 3 by the frictional resistance between the outer peripheral surface of the peripheral wall portion 11 and the inner peripheral surface of the first propulsion shaft 3, and only the assembly tool 30 is the first propulsion shaft. It is pulled out from 3.

  In the paper damper 10 </ b> A left in the first propulsion shaft 3, both end portions 12 a and 12 b of the radial wall portion 12 are pressed against the inner peripheral surface of the peripheral wall portion 11 as shown in FIG. As a result, the outer peripheral surface of the peripheral wall portion 11 is pressed against the inner peripheral surface of the first propulsion shaft 3, and the paper damper 10 </ b> A is fixed in the first propulsion shaft 3.

In the paper damper 10A as described above, as shown in FIG. 3B, when the paper damper 10A is inserted into the first propulsion shaft 3, the radial wall portion 12 passes through a substantially central position of the first propulsion pipe 3. To be arranged. Since the radial wall portion 12 is larger than the inner diameter of the first propelling pipe 3, both end portions 12 a and 12 b of the radial wall portion 12 are pressed against the inner peripheral surface of the peripheral wall portion 11. A biasing force acts on the inner peripheral surface of the peripheral wall portion 11 from the radial wall portion 12, and the outer peripheral surface of the peripheral wall portion 11 is pressed against the inner peripheral surface of the first propulsion shaft 3.
As described above, the paper damper 10A can be easily and reliably fixed in the first propulsion shaft 3 only by the operation of inserting the paper damper 10A into the first propulsion shaft 3, so that the work efficiency can be improved. .

  Further, the radial wall portion 12 is pressed against the inner peripheral surface of the peripheral wall portion 11, whereby the outer peripheral surface of the peripheral wall portion 11 can be kept in close contact with the inner peripheral surface of the first propulsion shaft 3. Therefore, it is possible to prevent the peripheral wall portion 11 from being reduced in diameter due to secular change, and to prevent the outer peripheral surface of the peripheral wall portion 11 from separating from the inner peripheral surface of the first propulsion shaft 3, thereby preventing a reduction in vibration isolation performance. Further, the paper damper 10A can be prevented from moving in the axial direction in the first propulsion shaft 3, and the weight balance of the first propulsion shaft 3 can be maintained.

  Further, in the method of assembling the paper damper 10A using the assembling tool 30 shown in FIG. 4A, the paper damper 10A can be easily formed using the assembling tool 30 (see FIG. 3B). ). Further, as shown in FIG. 5B, the paper damper 10A is inserted into the first propulsion shaft 3 together with the assembling tool 30, and only the assembling tool 30 is first propelled as shown in FIG. 5C. By pulling out from the shaft 3, the paper damper 10 </ b> A can be easily and reliably fixed in the first propulsion shaft 3.

  Further, in the assembling tool 30, as shown in FIG. 4B, when one edge of the thick paper P is inserted into the slit 32 and the thick paper P is bent, the proximal end from the distal end portion 12a of the radial wall portion 12 is obtained. A length L2 (see FIG. 3A) to the portion 12b is larger than the inner diameter L1 of the first propulsion shaft 3. Thus, the radial direction wall part 12 can be formed easily.

As mentioned above, although 1st embodiment of this invention was described, this invention is not limited to said 1st embodiment, In the range which does not deviate from the meaning, it can change suitably.
As shown in FIG. 3A, the peripheral wall portion 11 of the paper damper 10A of the first embodiment winds the cardboard P three times around the axis, but the number of times the cardboard P is wound is limited. It is not something.

  In the first embodiment, as shown in FIG. 1, the radial wall portion 12 is formed continuously in the axial direction of the propulsion shaft 1, but a plurality of radial wall portions 12 are arranged in the axial direction of the propulsion shaft 1. You may form at intervals.

  In the first embodiment, as illustrated in FIG. 1, the paper damper 10A used for the propulsion shaft 1 of the automobile is described as an example. However, the paper damper of the present invention is applicable to various hollow tubes. .

(Second embodiment)
Next, the paper damper 10B of 2nd embodiment of this invention is demonstrated.
As shown in FIG. 6, the paper damper 10 </ b> B of the second embodiment has substantially the same configuration as the paper damper 10 </ b> A (see FIG. 2) of the first embodiment, and a bent portion 13 is formed on the radial wall portion 12. Is different.

  In the cylindrical body 20 of the paper damper 10B of the second embodiment, as shown in FIG. 6, a slit 12c is formed from the front end portion to a half in the height direction in the axial intermediate portion of the radial wall portion 12. Has been. And the bending part 13 is formed by bend | folding the one side (front side of FIG. 6) of the axial direction of the radial direction wall part 12 at right angle by making the slit 12c into a boundary.

As shown in FIG. 7A, the length L4 from the distal end portion 13a to the proximal end portion 13b of the bent portion 13 is larger than the inner peripheral radius L3 of the first propulsion shaft 3 (see FIG. 7B). Largely formed.
Therefore, as shown in FIG. 7B, when the paper damper 10B is inserted into the first propulsion shaft 3, the tip 13a of the bent portion 13 is pressed against the inner peripheral surface of the peripheral wall portion 11, and the bent portion 13 is It will be in the state bent in the part 11, or the compressed state. A biasing force acts on the inner peripheral surface of the peripheral wall portion 11 from the bent portion 13.

  In this configuration, the peripheral wall portion 11 is pressed against the inner peripheral surface of the first propelling shaft 3 from three directions by the both end portions 12a and 12b of the radial wall portion 12 and the tip end portion 13a of the bent portion 13, so that the paper damper 10B is The first propulsion shaft 3 can be fixed more securely.

As mentioned above, although 2nd embodiment of this invention was described, 2nd embodiment can be suitably changed in the range which does not deviate from the meaning similarly to said 1st embodiment.
In the second embodiment, as shown in FIG. 7B, the bent portion 13 is orthogonal to the radial wall portion 12, but the angle of the bent portion 13 with respect to the radial wall portion 12 is limited. is not. A plurality of bent portions may be formed.

1 propulsion shaft 3 first propulsion shaft 4 second propulsion shaft 4a connecting shaft portion 5 first joint 6 constant velocity joint 6a outer ring member 6b power transmission member 7 second joint 8 bearing structure 8a bearing 8b vibration isolation member 10A paper damper ( First embodiment)
10B Paper damper (second embodiment)
DESCRIPTION OF SYMBOLS 11 Perimeter wall part 12 Radial direction wall part 12c Slit 13 Bending part 20 Cylindrical body 30 Assembling tool 31 Main-body part 32 Slit P Cardboard

Claims (5)

A paper damper inserted into the hollow tube,
It consists of a cylindrical body with cardboard rolled into a cylindrical shape,
The cylindrical body is
A spiral peripheral wall,
A radial wall portion extending in a radial direction of the peripheral wall portion from an inner peripheral edge of the peripheral wall portion, and
The paper damper according to claim 1, wherein a length from a distal end portion to a proximal end portion of the radial wall portion is larger than an inner diameter of the peripheral wall portion inserted in the hollow tube. In the cylindrical body,
A bent portion is formed by bending a part of the radial wall portion,
The paper damper according to claim 1, wherein a length from a distal end portion to a proximal end portion of the bent portion is larger than a radius of an inner periphery of the peripheral wall portion in a state of being inserted into the hollow tube. An assembly tool for assembling the paper damper according to claim 1 or 2 into the hollow tube,
Having a cylindrical body part,
A slit extending in the axial direction opens on the outer peripheral surface of the main body,
The slit is open to the front end surface of the main body,
In the slit, an edge of the cardboard is inserted,
The assembling tool, wherein the cardboard is wound around an outer peripheral surface of the main body. The slit is curved;
The assembly tool according to claim 3, wherein a length from the bottom surface of the slit to the opening is larger than an inner diameter of the peripheral wall portion in a state of being inserted into the hollow tube. A method for assembling a paper damper using the assembling tool according to claim 3 or 4,
Inserting the edge of the cardboard into the slit, and bending the cardboard along the outer peripheral surface of the main body at the opening of the slit to form the radial wall portion; and
Winding the cardboard around the outer peripheral surface of the main body to form the peripheral wall;
In the state where the paper damper is wound around the main body portion, the step of inserting the assembly tool into the hollow tube from the front end surface side;
A step of pulling out the assembly tool in the hollow tube from the base end surface side, and a method for assembling the paper damper.

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