JP3954261B2 - Supply piping for power transmission shaft - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid supply pipe attached to an outer surface of a power transmission shaft formed by connecting one end of a first shaft body and one end of a second shaft body via a cross joint. Examples of the power transmission shaft include a roll drive shaft of a rolling mill and a drive shaft of an automobile.
[0002]
[Prior art]
In the power transmission shaft as described above, as a supply pipe for supplying lubricating oil or cooling water from the first shaft side to the second shaft body across the cross joint, for example, Japanese Patent No. 263267 There is something like
[0003]
In this prior art, the liquid supply pipe is provided along the axial direction at one circumference on the outer surface of the two shaft bodies and the cross shaft joint. In such a configuration, the two shaft bodies are provided. In order to prevent the liquid supply pipe from being pulled or compressed at the position of the cross joint when it tilts, the liquid supply pipe is meandered on one of the shafts to install it. In order to prevent the meandering portion from interfering with the peripheral equipment, a tension is applied to the meandering portion by a tension applying means.
[0004]
[Problems to be solved by the invention]
In the above conventional example, in order to avoid a problem that is expected due to installation of the liquid supply pipe meandering, a tension applying means that eliminates slack in the meandering portion of the liquid supply pipe is required, and the equipment cost is reduced. The result is expensive.
[0005]
In view of such circumstances, an object of the present invention is to suppress an increase in equipment cost while avoiding damage at the time of tilting of a shaft body in a liquid supply pipe of a power transmission shaft.
[0006]
[Means for Solving the Problems]
The liquid supply pipe of the first power transmission shaft of the present invention has a first feed shaft with respect to the outer surface of the power transmission shaft formed by connecting one end of the first shaft body and one end of the second shaft body via a cross joint. A liquid supply pipe provided in a state extending from the shaft body side to the second shaft body side, wherein two of the bearing cups coupled to the first shaft body at the cross shaft joint from the other end side of the first shaft body A first straight pipe that linearly guides fluid along the axial direction toward one substantially pivot axis position, and the other substantially pivot shaft of the two bearing cups coupled to the first shaft body; A second straight pipe that guides fluid linearly along the axial direction toward the center position, and two bearing cups coupled to the second shaft body at the cross shaft joint from the downstream end of the first straight pipe A first curved pipe for guiding a fluid along a circumferential direction around the cross joint toward one rotational axis; The fluid is guided along the circumferential direction around the cross joint from the downstream end of the two straight pipes toward the other rotational axis of the two bearing cups coupled to the second shaft body at the cross joint. A second bent pipe, a first joint that communicates and connects the first straight pipe and one end of the first bent pipe, and a first joint that communicates and connects the other end of the first bent pipe and the interior of the corresponding bearing cup. And a third joint that communicates and connects the second joint, the second straight pipe and one end of the second curved pipe, and a fourth joint that communicates and connects the other end of the second curved pipe and the interior of the corresponding bearing cup. The first joint and the fourth joint, and each of the first joint and the fourth joint includes a swivel joint that allows a change in the crossing angle of the straight pipe and the curved pipe to be connected, and the first and second joints, and Each of the third and fourth joints is Shaped axis center 90 degrees out of phase with each other in the circumferential direction with respect to the joint is provided offset is characterized by.
[0011]
In short, the present invention pays attention to the fact that the distance between the rotation axes of the bearing cups adjacent in the circumferential direction of the cross joint is invariable even if the two shaft bodies are tilted. The curved pipe is bridged between the shafts without sagging.
[0012]
Accordingly, even when the two shaft bodies are inclined, the bearing cup does not interfere with the curved pipe or the straight pipe, and the pipes are not pulled or compressed. However, since the crossing angle of each pipe changes with the inclination of the two shaft bodies, each pipe may be twisted.
[0013]
This twisting of the pipe can be avoided by using a swivel joint for the joint that connects the straight pipe and the curved pipe in communication .
[0014]
Therefore, if it is the said structure, it will become possible to avoid the damage of a pipe, after making the tension | tensile_strength provision means essential in the prior art unnecessary.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
The details of the present invention will be described based on embodiments shown in the drawings.
[0016]
1 to 6 show a first embodiment which is an embodiment according to the present invention. 1 is a plan view showing a power transmission shaft equipped with a liquid supply pipe, FIG. 2 is a sectional view taken along line (2)-(2) in FIG. 1, and FIG. 3 is an exploded perspective view of the power transmission shaft. 4 is a perspective view showing the entire liquid supply pipe, FIG. 5 is a cross-sectional view showing a swivel joint of the liquid supply pipe, and FIG. 6 is a sectional view taken along line (6)-(6) in FIG. It is.
[0017]
In the figure, 1 indicates the entire power transmission shaft. The power transmission shaft 1 has a structure in which each end of the first transmission shaft 2 and the second rotation shaft 3 are connected to each other by a cross joint 4 in a state where the first rotation shaft 2 and the second rotation shaft 3 face each other coaxially.
[0018]
This cross shaft joint 4 has a well-known configuration in which bearing cups 7 to 10 are attached to four shaft ends of the cross shaft 5 via roller bearings 6, and a so-called block type is used here.
[0019]
The first and second bearing cups 7 and 8 facing each other at 180 degrees in the cross shaft joint 4 are also left with respect to the two flanges 2a and 2b formed integrally with one shaft end of the first rotating shaft 2. Two third and fourth bearing cups 9 and 10 are respectively attached to two flanges 3 a and 3 b integrally formed at one shaft end of the second rotating shaft 3 by bolts 11.
[0020]
In such a power transmission shaft 1, there is a place where liquid supply is required (not shown) on the other shaft end side of the second rotary shaft 3, and the power transmission shaft 1 is used in a situation where only a narrow space can be secured on the outer periphery of the liquid supply required place In this case, a liquid supply pipe 20 as described below is used in order to facilitate the liquid supply to the liquid supply necessary place on the second rotating shaft 3 side.
[0021]
The liquid supply pipe 20 supplies a fluid supplied from a liquid supply source (not shown) installed in a wide space on the other shaft end side of the first rotary shaft 2 to a place where liquid supply is required on the second rotary shaft 3 side. The first rotary shaft 2 is attached to the outer surface of the second rotary shaft 3 in a non-contact manner. In addition, examples of the fluid include lubricating oil and cooling water.
[0022]
Specifically, the liquid supply pipe 20 includes three pipes 21 to 23 and two swivel joints 24 and 24 that connect the three pipes 21 to 23 in communication with each other. In this embodiment, the three pipes 21 to 23 are pipes made of a metal material.
[0023]
The first straight pipe 21 rotates in the first bearing cup 7 in which the first rotary shaft 2 is coupled to one circumferential position on the outer surface of the first rotary shaft 2 from an intermediate position in the axial direction of the first rotary shaft 2. It is attached in a non-contact manner in a linear posture along the axial direction toward the axial center position.
[0024]
The second linear pipe 22 is located on the outer surface of the second rotary shaft 3 at a position shifted by 90 degrees from the first linear pipe 21, and the second rotary shaft 3 is moved from a position near the place where oiling is required on the second rotary shaft 3. The third bearing cup 9 to be coupled is provided in a non-contact manner in a linear posture along the axial direction toward the rotational axis position.
[0025]
The curved pipe 23 is formed on the outer surface of the first and third bearing cups 7 and 9 provided in the cross joint 4 from the position of the rotational axis on the outer diameter surface of the first bearing cup 7. It is attached in a non-contact manner in a curved posture along the circumferential direction toward the rotational axis position on the outer diameter surface.
[0026]
The swivel joint 24 communicates and connects the first and second straight pipes 21 and 22 to the curved pipe 23, and tilts the first rotary shaft 2 and the second rotary shaft 3 via the cross joint 4. Accordingly, the crossing angle between the first and second straight pipes 21 and 22 and the curved pipe 23 is allowed to change.
[0027]
Specifically, as shown in FIGS. 5 and 6, the swivel joint 24 includes a fixing member 25 fixed to the outer surfaces of the first and third bearing cups 7 and 9, and the bearing cup 7 with respect to the fixing member 25. , 9, a supporting shaft 26 installed in parallel with the rotating shaft center, a rotating member 27 supported rotatably about the supporting shaft 26, and a sliding contact surface between the supporting shaft 26 and the rotating member 27. And two O-rings 28 and 28 to be intervened.
[0028]
Inside the fixed member 25, the support shaft 26, and the rotating member 27, there are provided passages including holes as described below in order to communicate the first and second straight pipes 21, 22 and the curved pipe 23. It has been.
[0029]
The fixing member 25 is formed through the longitudinal direction and the shaft mounting hole 25a into which the support shaft 26 is screwed. The fixing member 25 is formed along the lateral direction and the first straight pipe 21 and the curved pipe 23 are screwed together. It has a recess 25b and a lateral hole 25c formed through the shaft attachment hole 25a from the bottom of the recess 25b.
[0030]
The support shaft 26 is provided on the outer periphery at the position of the horizontal hole 26a that is formed to penetrate along the radial direction in the axial direction, the vertical hole 26b that is formed to penetrate from the horizontal hole 26a toward the lower end, and the horizontal hole 26a. And an annular groove 26c.
[0031]
The rotating member 27 includes a shaft insertion hole 27a that is formed through the longitudinal direction and through which the support shaft 26 is inserted, a concave portion 27b that is formed along the horizontal direction and into which the curved pipe 23 is screwed, and the concave portion. And a lateral hole 27c formed through the shaft insertion hole 27a from the bottom of 27b.
[0032]
In the liquid supply operation in the first embodiment, a liquid supply source (not shown) may be connected to the liquid supply port (nipple) of the liquid supply pipe 20 and fluid may be injected from the liquid supply source. As a result, in the liquid supply pipe 20, the fluid is guided from the first straight pipe 21 to the second straight pipe 22 via the swivel joint 24 and the curved pipe 23, and is connected to the second straight pipe 22. It will be supplied to the place where liquid supply is required.
[0033]
As described above, when installing the liquid supply pipe 20 with the cross joint 4 straddling from the first rotating shaft 2 to the second rotating shaft 3, the first rotating shaft 2 side, the second rotating shaft 3 side, The first and second straight pipes 21 and 22 are arranged in a linear attitude along the axial direction at positions shifted in phase by 90 degrees, and are arranged in a curved attitude along the circumferential direction at the position of the cross joint 4. Since it is configured to communicate with each other via the curved pipe 23 and the swivel joint 24, it is possible to avoid breakage of the pipes 21 to 23 after eliminating the tension applying means that is essential in the conventional example. become.
[0034]
That is, in the above configuration, since the three pipes 21 to 23 constituting the liquid supply pipe 20 are not slackened as in the conventional example, the tension applying means that is essential in the conventional example becomes unnecessary, and the equipment cost increases. Can be suppressed.
[0035]
In the above configuration, when the first rotating shaft 2 and the second rotating shaft 3 are inclined, the rotation shaft centers of the first and third bearing cups 7 and 9 adjacent in the circumferential direction of the cross joint 4 are arranged. Since the distance is unchanged, the curved pipe 23 does not interfere with the first and third bearing cups 7 and 9, and the curved pipe 23 and the two straight pipes 21 and 22 are connected by the swivel joint 24. Therefore, the pipes 21 to 23 are not twisted. Therefore, damage to each of the pipes 21 to 23 is surely avoided.
[0036]
7 to 10 show a second embodiment which is an embodiment of a reference example. 7 is a side view of a power transmission shaft with a liquid supply pipe installed, FIG. 8 is a perspective view showing the entire liquid supply pipe, and FIG. 9 is a cross-sectional view taken along line (9)-(9) of FIG. FIG. 10 and FIG. 10 are cross-sectional views showing a second swivel joint of the liquid supply pipe.
[0037]
Normally, in the cross joint 4, oil reservoirs 5 a are provided at the four shaft ends of the cross shaft 5, and lubricating oil such as grease is filled therein, whereby the four bearing cups 7 to 10 are filled. On the other hand, the lubricating oil is supplied individually, and it is necessary to replenish the lubricating oil periodically in the oil reservoir.
[0038]
In the second embodiment, in a situation where only a narrow space can be secured on the outer periphery of the cross joint 4, the oiling operation becomes difficult. Therefore, the four bearing cups 7 to 7 in the cross joint 4 from the first rotary shaft 2 side are difficult. By installing four liquid supply pipes 30 </ b> A to 30 </ b> D for individually replenishing lubricating oil such as grease into 10, the oil supply work for the cross joint 4 is facilitated.
[0039]
The first and second liquid supply pipes 30 </ b> A and 30 </ b> B are connected to the first and second bearing cups 7 and 8 attached to the first rotary shaft 2, respectively. One straight pipe 41 installed in a linear posture along the axial direction at the required phase position, and through holes 7a, 8a provided at the rotational axis positions of the first and second bearing cups 7, 8. The fixed joint 42 is attached and connects the end of the straight pipe 41 in communication with the first and second bearing cups 7 and 8.
[0040]
The third and fourth liquid supply pipes 30 </ b> C and 30 </ b> D are connected to the third and fourth bearing cups 9 and 10 attached to the second rotating shaft 3, and both are a straight pipe 51, a curved pipe 52, and the like. The 1st rotation joint 53 and the 2nd rotation joint 54 are provided, and it installs with the following forms.
[0041]
The straight pipe 51 is installed in a straight posture along the axial direction next to the first and second liquid supply pipes 30A and 30B.
[0042]
The curved pipe 52 is extended in the circumferential direction between the pivot axis positions of the first and second bearing cups 7 and 8 and the pivot axis positions of the third and fourth bearing cups 9 and 10. Installed in a curved posture.
[0043]
The first swivel joint 53 communicates and connects the straight pipe 51 and the curved pipe 52 at the rotational axis positions of the first and second bearing cups 7 and 8, as shown in FIGS. 5 and 6. Is the same structure.
[0044]
The second swivel joint 54 connects the ends of the curved pipe 52 to the insides of the third and fourth bearing cups 9 and 10, and as shown in FIG. 10, in the third and fourth bearing cups 9 and 10. A support shaft 55 that is screwed into through-holes 9a and 10a provided at the center position of the cross shaft 5 mounting region, a rotation member 56 that is rotatably supported around the support shaft 55, and a support shaft 55. And two O-rings 57, 57 intervening on the sliding contact surface with the rotating member 56.
[0045]
Inside the support shaft 55 and the rotation member 56, a passage made of the following holes is provided in order to communicate the bending pipe 52 with the third and fourth bearing cups 9 and 10. .
[0046]
The support shaft 55 is provided on the outer periphery of the position of the horizontal hole 55a that is formed to penetrate along the radial direction in the axial direction, the vertical hole 55b that is formed to penetrate from the horizontal hole 55a toward the lower end, and the position of the horizontal hole 55a. And an annular groove 55c.
[0047]
The rotating member 56 includes a shaft insertion hole 56a that is formed through the longitudinal direction and through which the support shaft 55 is inserted, a concave portion 56b that is formed along the horizontal direction and into which the curved pipe 52 is screwed, and the concave portion. There is a lateral hole 56c formed through the shaft insertion hole 56a from the bottom of 56b.
[0048]
In this second embodiment, for the oil supply operation, an oil supply source (not shown) may be connected to the oil supply ports (nipples) of the first to fourth liquid supply pipes 30A to 30D, and lubricating oil may be injected from the oil supply source. In the first and second liquid supply pipes 30 </ b> A and 30 </ b> B, lubricating oil is introduced into the first and second bearing cups 7 and 8 from the straight pipe 41 through the fixed joint 42. Further, in the third and fourth liquid supply pipes 30 </ b> C and 30 </ b> D, the inside of the third and fourth bearing cups 9 and 10 from the straight pipe 51 through the first rotary joint 53, the curved pipe 52 and the second rotary joint 54. Lubricating oil is introduced into
[0049]
In Embodiment 2 demonstrated above, after implement | achieving the form which supplies lubricating oil separately with respect to the inside of the four bearing cups 7-10 of the cross joint 4 from the 1st rotating shaft 2 side, In order to avoid any possible damage to the third and fourth liquid supply pipes 30C and 30D when the first rotary shaft 2 and the second rotary shaft 3 are tilted, a method of sagging in a meandering manner as in the conventional example. Since the simple method of only devising the installation form of the 3rd, 4th liquid supply piping 30C and 30D itself is employ | adopted without employ | adopting, it becomes possible to suppress an increase in equipment cost. Moreover, when the first rotary shaft 2 and the second rotary shaft 3 are tilted, damage to the liquid supply pipes 30C and 30D is reliably avoided.
[0050]
In addition, this invention is not limited only to the said embodiment, Various application and deformation | transformation can be considered.
[0051]
(1) In the first embodiment, the single liquid supply pipe 20 is installed, but the liquid supply pipe 20 can be similarly installed at a position opposed to the single liquid supply pipe 20.
[0052]
(2) In the said Embodiment 1, 2, it can form with what has flexibility, such as rubber | gum, about the pipe which comprises the liquid supply piping 20, 30A-30D. In that case, the swivel joints 24, 53, 54 of the liquid supply pipes 20, 30A-30D are configured to be rotatably supported with respect to the bearing cup of the cross joint 4 as in the first and second embodiments. It is good also as a form supported without being fixed. In that case, when the first rotating shaft 2 or the second rotating shaft 3 tilts, the crossing angles of the pipes 21 to 23, 51, 52 tend to change, so that they are slightly twisted. Since this twist is absorbed by the flexible elasticity of the pipe itself, breakage of the pipes 21 to 23, 51, 52 is avoided.
[0053]
【The invention's effect】
In the invention of claim 1, since it is a simple configuration in which the installation form of the pipe constituting the liquid supply piping is devised and only the swivel joint is used, the tension applying means that is essential in the conventional example is made unnecessary and the equipment is installed. An increase in cost can be suppressed, and a pipe breakage can be reliably avoided during the tilting operation of the two shaft bodies.
[Brief description of the drawings]
FIG. 1 is a side view of a power transmission shaft equipped with a liquid supply pipe according to Embodiment 1, which is an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line (2)-(2) in FIG. 3 is an exploded perspective view of the power transmission shaft in FIG. 1. FIG. 4 is a perspective view showing the whole liquid supply pipe in FIG. 1. FIG. 5 is a cross-sectional view showing a swivel joint of the liquid supply pipe in FIG. Fig. 7 is a sectional view taken along line (6)-(6) in Fig. 5. Fig. 7 is a side view of a power transmission shaft equipped with a liquid supply pipe according to a second embodiment which is an embodiment of the reference example . FIG. 9 is a perspective view showing the entire liquid piping. FIG. 9 is a cross-sectional view taken along line (9)-(9) in FIG. 7. FIG. 10 is a cross-sectional view showing a second swivel joint of the liquid supply piping in FIG. Explanation】
DESCRIPTION OF SYMBOLS 1 Power transmission shaft 2 1st rotating shaft 3 2nd rotating shaft 4 Cross shaft joint 5 Cross shaft 7-10 Bearing cup 20 Liquid supply piping 21 1st straight pipe 22 2nd straight pipe 23 Curved pipe 24 Turn joint

Claims (1)

Attached to the outer surface of the power transmission shaft formed by connecting one end of the first shaft body and one end of the second shaft body via a cross shaft joint in a state extending from the first shaft body side to the second shaft body side. A liquid supply pipe
From the other end side of the first shaft body, the fluid is linearly guided along the axial direction toward substantially the pivot axis position of one of the two bearing cups coupled to the first shaft body at the cross shaft joint. A first straight pipe;
A second straight pipe for linearly guiding the fluid along the axial direction toward the other substantially rotating shaft center position of the two bearing cups coupled to the first shaft body;
From the downstream end of the first straight pipe, fluid flows along the circumferential direction around the cross shaft joint toward the rotational axis of one of the two bearing cups coupled to the second shaft body at the cross shaft joint. A first curved pipe leading;
Fluid flows along the circumferential direction around the cruciform joint from the downstream end of the second straight pipe toward the rotational axis of the other of the two bearing cups coupled to the second shaft body at the cruciform joint. A second curved pipe that guides
A first joint for communicatively connecting the first straight pipe and one end of the first curved pipe;
A second joint for communicatively connecting the other end of the first curved pipe and the corresponding bearing cup;
A third joint for communicatively connecting the second straight pipe and one end of the second curved pipe;
A fourth joint that communicates and connects the other end of the second curved pipe and the corresponding interior of the bearing cup;
Each of the first joint to the fourth joint includes a swivel joint that allows a change in the crossing angle of the straight pipe and the curved pipe to be connected, the first and second joints, and the third and fourth joints. Each of the joints is provided with a 90 ° phase shift in the circumferential direction with respect to the center of the cross shaft joint.

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