JP2013221577A - Flange yoke, propeller shaft, and method for preventing rotation of the flange yoke - Google Patents

Abstract

A flange yoke capable of preventing rotation when fastened to a mating member and a bolt with a simple configuration, a propulsion shaft provided with the flange yoke, and a method of preventing rotation of the flange yoke are provided.
A flange yoke 10 that constitutes a cruciform joint 1 that connects a companion flange 310 and a first shaft 211, and is fastened by a companion flange 310 and a bolt 101, and a mounting hole in which the cruciform shaft 71 is mounted. , A flange 30 extending radially outward from the yoke 20 and fastened with a bolt 101, and a notch portion where a tool 400 for non-rotating the flange 30 when the bolt 101 is rotated is locked 33.
[Selection] Figure 4

Description

  The present invention relates to a flange yoke, a propulsion shaft, and a method for preventing rotation of the flange yoke.

  The propulsion shaft (propeller shaft) is a device that transmits power, and is mounted, for example, at the lower center of the vehicle body of a rear wheel drive vehicle or a four wheel drive vehicle (vehicle). The power of the internal combustion engine (prime mover) mounted on the front side of the vehicle body is shifted by the transmission and then input to the final reduction gear via the propulsion shaft.

  That is, the propulsion shaft has at least two or more cruciform joints (universal joints), that is, a first cruciform joint that is disposed on the front side and is connected to a companion flange that rotates integrally with the output shaft of the transmission, and a rear side. And a second cross shaft joint that rotates integrally with a drive pinion of the final reduction gear, and a shaft made of, for example, a steel pipe is provided between the first cross shaft joint and the second cross shaft joint. .

  When the resonance point of this axis is made higher than the practical rotational speed range, for example, it is divided into a first axis on the front side and a second axis on the rear side, and the first axis and the second axis are Connected by constant velocity joint. The first shaft or the second shaft is rotatably supported by the vehicle body via the intermediate bearing unit.

  Here, the flange yoke that constitutes the first cross shaft joint or the second cross shaft joint and the companion flange that is the counterpart component are generally fastened by bolts. The magnitude of the power that can be transmitted between the flange yoke and the companion flange includes the axial force generated by tightening the bolt and the pitch circle diameter of the bolt (PCD, Pitch Circle Diameter). ). Therefore, the bolt is formed of a high-strength material and is tightened with a high torque by a torque wrench or the like.

  By the way, such bolt tightening work is normally performed in a state where the vehicle is lifted up, and the transmission and the final reduction gear are in a state in which they can idle. Therefore, when the bolt is tightened, the flange yoke, the companion flange, As a result, the workability was reduced.

  In relation to these problems, a hexagonal cross section is formed on the stub shaft that is integral with the inner race (inner ring member) of the Barfield constant velocity joint, and a spanner is engaged with this engagement section. The technique to do is proposed (refer patent document 1).

JP 2009-227028 A

  However, since the flange yoke constituting the cross shaft joint has a U-shaped yoke at the center thereof, the stub shaft described in Patent Document 1 cannot be formed.

  Accordingly, an object of the present invention is to provide a flange yoke capable of preventing rotation when rotating a bolt with a simple configuration, a propulsion shaft provided with the flange yoke, and a method for preventing rotation of the flange yoke.

  As a means for solving the above-mentioned problems, the present invention provides a flange yoke that constitutes a cruciform joint for connecting the first member and the second member, and is fastened by a bolt to the first member. A yoke having a mounting hole to which a bolt is mounted, a flange extending radially outward from the yoke and fastened with the bolt, and a tool for non-rotating the flange when the bolt is rotated. And a rotation preventing portion.

According to such a configuration, when the bolt is rotated in the tightening direction in order to fasten the flange yoke and the first member, the flange (flange yoke) is not rotated by the tool being locked to the rotation preventing portion. In other words, the rotation can be prevented. Thereby, since the flange yoke and the first member do not idle, the bolt can be rotated well with a torque wrench or the like and can be easily tightened with a desired torque.
Further, when the bolt is rotated in the loosening direction to separate the flange yoke and the first member, the flange (flange yoke) can be non-rotated by the tool being locked to the rotation preventing portion.

  Further, in the flange yoke, the yoke includes a pair of arm portions that have the mounting hole and are arranged in one diameter direction (vertical direction in FIG. 4). The anti-rotation part is preferably arranged in a direction (left and right direction in FIG. 4) perpendicular to the one diameter direction while sandwiching the center of the flange.

According to such a configuration, the two detent portions are arranged in the direction perpendicular to the one diameter direction while sandwiching the center of the flange. The flange yoke) can be stably brought into a non-rotating state.
In addition, as in the embodiment described later, the two detent portions can be locked by a bifurcated tool so that one side does not interfere with the pair of arms.

  In the flange yoke, it is preferable that the rotation preventing portion is a notch formed in the flange.

  In the flange yoke, it is preferable that the rotation preventing portion is a protrusion formed on the flange.

  According to such a configuration, the rotation preventing portion can be easily configured by the cutout portion or the protruding portion.

  In the flange yoke, the outer shape of the flange is preferably the same shape as the outer shape of the fastened portion constituting the first member.

  According to such a configuration, since the outer shape of the flange is the same as the outer shape of the fastened portion constituting the first member, the mating surface of the fastened portion is not exposed to the outside. Therefore, it becomes difficult for rainwater or the like to adhere to the mating surfaces of the fastened portions. Thereby, it is not necessary to apply the coating etc. for rust prevention to the mating surface of a to-be-fastened part.

  Further, the present invention is a propulsion shaft that is mounted on a vehicle and transmits power between the transmission and the final reduction gear, and includes a cross shaft joint including the flange yoke, and the first member includes the speed change gear The propulsion shaft is a component that rotates integrally with the output shaft of the machine or a component that rotates integrally with the drive pinion of the final reduction gear.

  The present invention also relates to a method for preventing rotation of a flange yoke that forms a cross shaft joint for connecting a first member and a second member, and is fastened with a bolt to the first member. A yoke having a pair of arm portions having a mounting hole in which a shaft is mounted and arranged in one diameter direction, a flange extending radially outward from the yoke and fastened by the bolt, and a center of the flange An anti-rotation portion that is disposed in a direction perpendicular to the one diameter direction and that holds the tool for non-rotating the flange when the bolt is rotated, and one side of the pair of arms and Use a tool comprising a tool arm portion that is bifurcated so as not to interfere, and a locking portion that is provided on the tool arm portion and that locks to the anti-rotation portion, and the locking portion of the tool is A rotation preventing method of the flange yoke, characterized by rotating the bolt in a state engaged with the detent portion of the serial flange yoke.

  According to the present invention, it is possible to provide a flange yoke capable of preventing rotation when rotating a bolt with a simple configuration, a propulsion shaft provided with the flange yoke, and a method for preventing rotation of the flange yoke.

It is a top view of the propulsion shaft concerning a 1st embodiment. It is a top view of the cross joint which concerns on 1st Embodiment, and respond | corresponds to the X1-X1 line cross section of FIG. It is a side view of the flange yoke which concerns on 1st Embodiment. It is the figure which looked at the flange yoke which concerns on 1st Embodiment from back. It is a figure of the tool latched to the flange yoke which concerns on 1st Embodiment, Comprising: (a) is the figure (front view) seen from the front, (b) is a side view. It is a figure explaining an effect | action of the flange yoke which concerns on 1st Embodiment. It is a side view of the flange yoke which concerns on 2nd Embodiment. It is the figure which looked at the flange yoke which concerns on 2nd Embodiment from back. It is the figure which looked at the flange yoke which concerns on a comparative example from back.

<< First Embodiment >>
A first embodiment of the present invention will be described with reference to FIGS.

≪Composition of propulsion shaft≫
The propulsion shaft 200 (propeller shaft) according to the first embodiment is mounted on a rear-wheel drive four-wheeled vehicle (vehicle), and outputs the power output from a transmission (not shown) disposed on the front side of the vehicle. A power transmission shaft that is transmitted to a final reduction gear (not shown) disposed on the rear side of the vehicle, and extends in the front-rear direction and in the horizontal direction. The transmission shifts the power output from the internal combustion engine (prime mover) disposed under the hood on the front side of the vehicle.

The propulsion shaft 200 has a two-piece structure (a two-part structure). The first shaft 211 on the front side (one side), the second shaft 212 on the rear side (the other side), and the rear of the first shaft 211. A constant velocity joint 220 that connects the end and the front end of the second shaft 212; an intermediate bearing unit 230 that rotatably supports the propulsion shaft 200 with respect to the vehicle body in the middle of the propulsion shaft 200; and a front cross shaft A joint 1 (universal joint, universal joint) and a rear cross shaft joint 2 are provided. The constant velocity joint 220 includes, for example, a tripart type, a double offset type, a lebro type, and a bar field type.
In addition, the propulsion shaft 200 may not include the constant velocity joint 220, and the first shaft 211 and the second shaft 212 may be connected by a cross shaft joint.

≪Cross shaft joint configuration≫
The cross shaft joint 1 on the front side is a joint that connects the companion flange 310 (see FIG. 2, first member) and the front end portion of the first shaft 211 (second member).

  The companion flange 310 includes a cylindrical portion 311 and a ring-shaped flange portion 312 (fastened portion) that extends radially outward from the rear side of the cylindrical portion 311. An involute spline is formed in the cylindrical portion 311, the cylindrical portion 311 is connected to the output shaft of the transmission, and the cylindrical portion 311 (companion flange 310) is a component that rotates integrally with the output shaft.

  The flange portion 312 is a fastened portion to be fastened to the flange 30 described later, and the outer shape of the flange portion 312 is circular when viewed in the axial direction, that is, the outer shape line of the flange portion 312 is circumferential. The flange portion 312 is formed with a bolt hole into which a bolt 101 described later is inserted.

  Further, a ring-shaped recess 313 is formed on the cross shaft joint 1 side of the flange portion 312, and a mating surface with the flange 30 to be described later is a stepped surface with a radially inward recess. A protrusion 34, which will be described later, of the flange 30 is fitted into the recess 313, whereby the flange 312 and the flange 30 are positioned in the radial direction.

  The rear cross shaft joint 2 is a joint that connects the companion flange 320 (first member) and the rear end portion of the second shaft 212 (second member).

  Similar to the companion flange 310, the companion flange 320 includes a cylindrical portion 321 and a ring-shaped flange portion 322 (fastened portion) that extends radially outward from the front side of the cylindrical portion 321. An involute spline is formed in the cylindrical portion 321, and the cylindrical portion 321 is connected to a drive pinion of the final reduction gear. That is, the cylindrical portion 321 (the companion flange 320) is a component that rotates integrally with the drive pinion.

  Although the cruciform joint 1 and the cruciform joint 2 have the same configuration, although they are reversed, the cruciform joint 1 will be specifically described below.

  As shown in FIG. 2, the cross joint 1 includes a flange yoke 10 that is bolted to the flange portion 312 of the companion flange 310, a stub yoke 50 that is fixed to the front end of the first shaft 211 by friction welding, and the like. 10 and a stub yoke 50, and a cruciform shaft 71 (spider) having a cross shape when viewed in the axial direction.

  The flange yoke 10 and the stub yoke 50 can be bent with the cross shaft 71 as a node. Further, a bearing 72 is mounted between each tip portion (held portion) of the cross shaft 71 and the flange yoke 10 or the stub yoke 50 so as to be rotatable. The bearing 72 is composed of, for example, a needle bearing.

≪Stub York≫
The stub yoke 50 is a forged product or a cast product, and has a cylindrical portion 51 that is cylindrical and fixed to the front end of the first shaft 211, and a yoke 52 that has a horizontal U-shape in a plan view on the front side of the cylindrical portion 51. It is equipped with. A pair of arm portions 53, 53 constituting the yoke 52 is formed with a through hole 53 a (mounting hole) in which the cross shaft 71 is mounted.

≪Configuration of flange yoke≫
The flange yoke 10 is a forged product or a cast product, and has a yoke 20 that has a horizontal U-shape in a longitudinal sectional view, and an outer side (radially outer side) in a direction perpendicular to the axis (cross-sectional sectional direction) from the base end portion 21 of the yoke 20. And a flange 30 formed so as to extend.

<Flange yoke-yoke>
The yoke 20 is disposed at a portion corresponding to the bottom of the U-shape and is rearward from the base end portion 21 which is rectangular in the axial direction and from both ends of the base end portion 21 (the upper end portion and the lower end portion in FIGS. 3 and 4). A pair of arm portions 22, 22 extending in the direction. In other words, the pair of arm portions 22 and 22 are arranged in one diameter direction of the flange 30 (vertical direction in FIG. 4).

The base end portion 21 has a rectangular shape when viewed in the axial direction.
A through-hole 22a (mounting hole) in which the cross shaft 71 is mounted is formed on the rear side of each arm portion 22. A cross shaft 71 is rotatably mounted in the through hole 22a.

<Flange yoke-flange>
The flange 30 is a portion that is fastened by the companion flange 310, the bolt 101, and the nut 102. The outer shape of the flange 30 is circular when viewed in the axial direction, and is the same shape as the flange portion 312 of the companion flange 310.

  In other words, the outer shape of the flange 30 overlaps the outer shape of the flange portion 312 when viewed in the axial direction, and does not protrude from the flange portion 312 in the radial direction. The shape of the flange 30 corresponds to the shape of the flange portion 312, the outline of the flange 30 overlaps the outline of the flange portion 312, and the mating surface (front surface) of the flange 30 corresponds to the flange portion 312 and has a diameter corresponding to the flange portion 312. Enlarged outward in the direction.

  That is, the flange 30 overlaps the rear surface (mating surface) of the flange portion 312 and the rear surface is not exposed to the outside. Thereby, rain water, muddy water, etc. become difficult to adhere to the rear surface of the flange portion 312, and the rear surface is less likely to rust. Therefore, it is not necessary to apply rust prevention coating to the rear surface, and the coating process after fastening of the flange 30 can be omitted.

  On the other hand, as shown in the comparative example of FIG. 9, when viewed in the axial direction, the outer shape of the flange 30A is square, the flange 30A is smaller than the flange portion 312 of the companion flange 310, and the flange portion 312 is exposed. If this is the case, it is necessary to apply a coating for preventing rust to the exposed portion.

Returning to FIG. 4, the description will be continued.
The flange 30 includes four seat surface portions 31. The four seating surface portions 31 are fastened portions that are bolted to the flange portion 312 of the companion flange 310 by the bolt 101 and the nut 102 in the axial direction. The four seating surface portions 31 are disposed near the outer peripheral edge of the flange 30 and are disposed at equal intervals in the circumferential direction.

  The seat surface portion 31 has a substantially circular shape when viewed in the axial direction, and a bolt hole 32 through which the bolt 101 is inserted is formed at a substantially center thereof (see FIG. 4).

  The rotation diameter of the bolt hole 32, that is, the pitch circle diameter (PCD) of the bolt 101 is the magnitude of the power transmitted between the flange 30 and the companion flange 310, and the axis of the bolt 101 when tightened. Designed based on power etc. That is, as the power to be transmitted increases, the rotation diameter of the bolt hole 32 (the pitch circle diameter of the bolt 101) increases.

  Two notches 33 (non-rotating portions) are formed on the outer peripheral edge of the flange 30. When the flange yoke 10 and the companion flange 310 are bolted, the notch 33 is a portion where a tool 400 (see FIGS. 5 and 6) for making the flange yoke 10 non-rotating is locked. The notch 33 is disposed between the seating surface portions 31 adjacent in the circumferential direction, and the radially outer side, the front side, and the rear side are open to the outside.

  The two notches 33 are arranged on one diameter line of the flange 30 and are arranged symmetrically about the rotation axis of the cross joint 1 (propulsion shaft 200). Further, the two notches 33 are arranged in the short direction (left and right direction in FIG. 4) of the rectangular base end portion 21 constituting the yoke 20. That is, the two notches 33 are arranged in the left-right direction perpendicular to the up-down direction (one diameter direction) in FIG. 4, which sandwiches the rotation axis (center) of the flange 30 and is arranged by the pair of arm portions 22. Thereby, the distance of the notch part 33 and a rotating shaft line can be enlarged, and the flange yoke 10 can be stably made into a non-rotating state.

  Such a notch 33 may be formed at the same time as the flange yoke 10 is formed by forging or casting, or may be formed by machining after the flange yoke 10 is formed by forging or casting. Good.

  A ring-shaped protrusion 34 is formed on the front surface of the flange 30. The protrusion 34 is fitted in the recess 313 of the flange portion 312.

≪Non-rotating tool≫
Here, the anti-rotation tool 400 will be described with reference to FIG.
The tool 400 includes an arm 411 (tool arm part) that is bifurcated and has a U-shape so that the upper side (one side) does not interfere with the pair of arm parts 22, and a protrusion part 412 formed on the tip part of the arm 411 ( A locking portion) and a rod-like handle 420 extending downward from the intermediate portion of the arm 411.

  Since the arm 411 has a U shape and is bifurcated as described above, the pair of arm portions 22 of the flange yoke 10 is disposed inside the arm 411. That is, the arm 411 can be inserted in the radial direction without being obstructed by the pair of arm portions 22 of the flange yoke 10.

  Each protrusion 412 has a shape corresponding to the notch 33 and is configured to be inserted into the notch 33 from the rear side. The interval between the two protrusions 412 corresponds to the interval between the two notches 33.

≪Method of preventing rotation of flange yoke, effect of flange yoke etc.≫
Next, the effect of the flange yoke 10 and the flange yoke 10 according to this embodiment will be described. The rotation prevention method of the flange yoke is characterized in that the bolt 101 is rotated in a state where the projection 412 of the tool 400 is locked to the notch 33 of the flange yoke 10.
Here, the case where the bolt 101 is rotated in the tightening direction and the flange 30 and the flange portion 312 are fastened is illustrated, but the same applies to the case where the bolt 30 is rotated in the loosening direction and the flange 30 and the flange portion 312 are separated. It is.

  As a premise, the transmission and the final reduction gear are assembled to the vehicle body, and the vehicle body is lifted by a lift, a hanger or the like. Therefore, the companion flange 310 and the companion flange 320 are in a state capable of idling.

  Then, the propulsion shaft 200 is attached to the vehicle body from below. That is, the propulsion shaft 200 is attached to the vehicle body via the intermediate bearing unit 230. Next, after the bolt hole 32 of the flange 30 and the bolt hole of the flange portion 312 are aligned in the circumferential direction, the bolt 101 is inserted and screwed into the nut 102.

  Then, the tool 400 is inserted from the bottom to the top of the vehicle body, and the two protrusions 412 are inserted into the two notches 33 of the flange 30 and held in that state (see FIG. 6). Then, since the flange 30 and the flange portion 312 are locked in the circumferential direction by the tool 400, the flange 30 is prevented from rotating and is not rotated.

  As a result, even if the bolt 101 is rotated by the torque wrench 500, the flange 30 and the flange portion 312 are prevented from rotating by the tool 400, so that the flange 30 and the flange portion 312 do not idle and the bolt 101 is tightened well. Can proceed.

≪Modification≫
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to this, For example, you may change as follows and may combine with embodiment mentioned later suitably.

  In the above-described embodiment, the configuration in which the two notches 33 are formed is illustrated, but the number of the notches 33 may be three or more.

<< Second Embodiment >>
A second embodiment of the present invention will be described with reference to FIGS. In addition, a different part from 1st Embodiment is demonstrated.

  The flange yoke 10 according to the second embodiment includes two projecting portions 35 (detent portions) that protrude rearward and are formed integrally with the flange 30 instead of the two cutout portions 33. Correspondingly, the tool 400 is formed with a recess or a through hole (locking portion) into which the protrusion 35 is inserted instead of the protrusion 412 (see FIG. 5).

  Then, by inserting the two protrusions 35 of the flange 30 into the concave portion or the through hole of the tool 400, the flange 30 and the flange portion 312 are locked in the circumferential direction as in the first embodiment. I can stop it.

1, 2 Cross shaft joint 10 Flange yoke 20 Yoke 30 Flange 33 Notch (rotation stop)
35 Protrusion (non-rotating part)
71 Cross shaft 101 Bolt 200 Propulsion shaft 211 First shaft (second member)
212 Second shaft (second member)
310, 320 companion flange (first member)
312 and 322 Flange part (fastened part)
400 Tool 411 Arm (Tool Arm)
412 Projection (locking part)

Claims (7)

A flange yoke that constitutes a cross joint that connects the first member and the second member, and is fastened by a bolt with the first member,
A yoke having a mounting hole to which the cross shaft is mounted;
A flange extending radially outward from the yoke and fastened with the bolt;
When rotating the bolt, an anti-rotation portion for locking a tool for non-rotating the flange;
A flange yoke characterized by comprising: The yoke includes a pair of arm portions having the mounting hole and arranged in one diameter direction,
Two anti-rotation portions,
The flange yoke according to claim 1, wherein the two detent portions are arranged in a direction perpendicular to the one diameter direction while sandwiching the center of the flange. The flange yoke according to claim 1 or 2, wherein the rotation stopper is a notch formed in the flange. The flange yoke according to claim 1 or 2, wherein the rotation stopper is a protrusion formed on the flange. 5. The flange yoke according to claim 1, wherein an outer shape of the flange is the same as an outer shape of a fastened portion constituting the first member. A propulsion shaft that is mounted on a vehicle and transmits power between a transmission and a final reduction gear,
A cross shaft joint including the flange yoke according to any one of claims 1 to 5,
The propulsion shaft, wherein the first member is a component that rotates integrally with an output shaft of the transmission, or a component that rotates integrally with a drive pinion of the final reduction gear. A method for preventing rotation of a flange yoke that constitutes a cruciform joint that connects a first member and a second member, and is fastened by a bolt with the first member,
The flange yoke has a mounting hole to which a cross shaft is mounted and has a pair of arm portions arranged in one diameter direction; a flange extending radially outward from the yoke and fastened by the bolt; An anti-rotation part which is disposed in a direction perpendicular to the one diameter direction and sandwiches the center of the flange, and which is engaged with a tool for non-rotating the flange when rotating the bolt,
Using a tool comprising a tool arm portion that is bifurcated so that one side does not interfere with the pair of arms, and a locking portion that is provided on the tool arm portion and that locks to the rotation preventing portion,
The method of preventing rotation of the flange yoke, wherein the bolt is rotated in a state where the locking portion of the tool is locked to the rotation preventing portion of the flange yoke.

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