JPH0744820Y2 - Spline coupling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a spline coupling device that couples coaxially arranged first and second rotating shafts so that torque can be transmitted with respect to rotation about an axis. .

(Prior Art) Conventionally, as shown in FIG. 6, a device of this type is generally provided with first and second outer spline portions 11a formed straight on the outer circumferences of the first and second rotating shafts 11 and 12, respectively. , 12a and a sleeve 13 having first and second inner spline portions 13a, 13b formed straight so as to be fitted to the first and second outer spline portions 11a, 12a, respectively.
By sliding the first and second inner spline portions 13a and 13b onto the first and second outer spline portions 11a and 12a, respectively. Also, the second rotary shafts 11 and 12 are coupled so that torque can be transmitted with respect to the rotation about the axis.

Further, as another conventional technique, as disclosed in Japanese Utility Model Laid-Open No. 61-67279 and as shown in FIGS. 7 and 8, an outer spline portion 21a formed at an end portion of the first rotating shaft 21, A first boss 22 having an inner spline portion 22a fitted to the outer spline portion 21a, and a pair of elongated holes 23a, 23a formed integrally with the boss 22 and having an arc centered on the axis. The long hole 23a fixed to the flange 23 and the second rotary shaft 24,
A pair of screw holes 26a into which bolts 25, 25 are screwed through 23a,
And a second flange 26 having an outer spline portion 2
There is also one in which the first flange 23 and the second flange 26 are fixed to each other by bolts 25, 25 after the 1a is fitted to the inner spline portion 22a.

(Problems to be Solved by the Invention) However, in the conventional device shown in FIG.
And the state where the second rotating shaft is provided, that is, the first rotating shaft
11 (or the second rotating shaft 12) is assembled to the drive side device and the second rotating shaft 12 (or the first rotating shaft 11) is assembled to the driven side device, the sleeve 13 is used to 1st and 2nd rotating shaft
When splicing 11 and 12 with each other, the rotational positions of the first and second rotary shafts 11 and 12 are determined by the assembling, so that the outer spline portion 11a of the first rotary shaft 11 and the second rotary shaft 11 are rotated. Maximum 2π / 2N between 12 outer spline parts 12a
(N is the number of teeth of the outer spline portion 11a and the outer spline portion 12a) A phase difference may occur. When such a phase difference occurs, one of the first and second rotary shafts 11 and 12 is rotated to move the sleeve 13 into the first and second rotary shafts 1.
Must be installed on 1,12, first and second rotating shaft
After assembling 11, 12 to the drive side and driven side devices respectively and setting the drive side and driven side devices to the reference state, the first and second rotating shafts 11, 12 are rotated, The reference state of the drive-side or driven-side device may shift, and this shift may reach an amount corresponding to the maximum phase difference 2π / 2N. In such a case, the spline coupling device, the driving-side, and the driven-side may be shifted. However, there is a problem that the accuracy of the entire system including the above device deteriorates.

On the other hand, in the conventional device shown in FIG. 7 and FIG. 8, when the boss 22 is assembled to the first rotary shaft 21, the first flange 23 becomes the second rotary shaft 24 (second flange 26). Since it is possible to rotate continuously with respect to it, there is no problem with the above-mentioned assembling property and the accuracy of the system, but since the first and second flanges 23 and 26 are fixed by the bolts 25 and 25, the bolt tightening At this time, the rotational positions of the first and second rotary shafts 21 and 24 may shift, or the bolts 25 and 25 may loosen during torque transmission, causing a phase shift in torque transmission. As a result, there is a problem that the control accuracy of the rotational position of the driven device by the drive device deteriorates.

The present invention has been devised in view of the above problems, and an object thereof is to provide a spline coupling device in which the assembly accuracy and control accuracy are improved.

(Means for Solving the Problems) In order to achieve the above object, the structural features of the present invention are as follows.
In a spline coupling device in which the first rotary shaft (91) and the second rotary shaft (92) are spline-coupled so that torque can be transmitted,
One end is torsionally splined to the first rotating shaft (91) and the other end has a straight outer spline (94).
d) the rod-shaped first connecting member (93, 94) and the cylindrical inner spline (95) formed on the inner circumference.
a), which is fitted to the outer spline (94d) of the first connecting member (93, 94) at one end and is straight on the other end formed on the outer circumference of the second rotating shaft (92). The second connecting member (9) fitted to the outer spline (92a) of the second connecting member (95) and the outer periphery of the second connecting member (95).
Fixing devices (70D, 70E) for fixing 5) on the outer circumferences of the first connecting member (93, 94) and the second rotating shaft (92), the first connecting member (93, 94) and the second rotating shaft. A shaft (91b) coaxially connecting with (92), the first connecting member (93) and the first rotating shaft (92) before being connected to each other by the second connecting member (95). The first connecting member (93, 94) and the second rotating shaft (9) while maintaining the coaxiality of the connecting member (93, 94) and the second rotating shaft (92).
2) is provided with an axis (91b) that enables relative displacement in the axial direction and relative rotation around the axis.

(Operation and Effect of the Invention) In the present invention configured as described above, the first connecting member (93, 94) and the second rotating shaft (9) are connected by the second connecting member (95).
Before connecting with 2), the shaft (92b) is connected to the first connecting member (93,9).
4) Allowing relative displacement in the axial direction and relative rotation around the axis of the first connecting member (94) and the second rotating shaft (92) while maintaining coaxiality between the second rotating shaft (92) and the second rotating shaft (92). . On the other hand, the first connecting member (93, 94) is twisted and splined to the first rotating shaft (91) at one end, so that the first rotating shaft (91) and the second rotating shaft (92) are fixed. Then, the first connecting member (9
3,94) is rotated about the axis while being displaced in the axial direction with respect to the first rotating shaft (91), the first connecting member (93,9)
4) The phase of the outer spline (94d) formed straight on the outer circumference of the outer periphery of (4) and the phase of the outer spline (92a) formed straight on the outer circumference of the second rotating shaft (92) are matched. You can Then, in this state, the inner splines 95a formed in a straight shape on the inner periphery of the second connecting member (95) are fitted to the both outer splines (92a, 94d), and the fixing device (70D, 70E ) By the second connecting member (95)
Are fixed on the outer circumferences of the first connecting member (93, 94) and the second rotating shaft (92), the first rotating shaft (91) becomes the second rotating shaft (9).
2) Spline-connected to enable torque transmission.

Thus, according to the present invention, the first rotating shaft (91) and the second rotating shaft (91)
Since the phase difference of the rotating shaft (92) is absorbed by the first connecting member (93, 94), the driving device and the driven device connected to the first rotating shaft (91) and the second rotating shaft (92) respectively. The drive device and the driven device can be connected to each other via the spline coupling device so that power can be transmitted without shifting the reference state, and the assembling accuracy of the entire system including the spline coupling device, the driving device and the driven device is good. Becomes In addition, the first connecting member (93, 94) and the second connecting member (95) are connected to each other.
Before connecting with the rotating shaft (92), use the shaft (91b) to move the first
Since the coaxiality between the connecting members (93, 94) and the second rotating shaft (92) is maintained, the first connecting member (93, 94) and the second rotating shaft (9
The work of fitting the inner spline (95a) of the second connecting member (95) to the outer splines (94a, 92a) of 2) can be easily performed. Further, after the connection, torque transmission between the first rotating shaft (91) and the second rotating shaft (92) is all performed through spline fitting, so that the first rotating shaft (91) and the second rotating shaft (91) are connected to each other. The accuracy of torque transmission between the rotary shaft (92) and the control accuracy of the system is improved.

(Embodiment) Hereinafter, one embodiment of the present invention will be described with reference to the drawings. In FIG. 5, a spline coupling device 90 according to the present invention is provided between a front wheel steering device 40 and a rear wheel steering device 50. Left and right rear wheels RW1, RW
2 schematically shows the entire front and rear wheel steering vehicle that steers 2 in conjunction with the left and right front wheels FW1 and FW2.

The front wheel steering system 40 is the front steering gear box 41.
The gear box 41 is configured to displace the rack bar 44 in the axial direction according to the rotation of the steering shaft 43 accompanying the rotation of the steering handle 42. Left and right front wheels FW1 and FW2 are connected to both ends of the rack bar 44 via left and right tie rods 45a and 45b and left and right knuckle arms 46a and 46b.
W2 is steered according to the displacement of the rack bar 44 in the axial direction.

The front steering gear box 41 has a pinion shaft 61
The front end of the shaft is intruded, and the coaxial shaft 61 is rotated by the left and right front wheels FW1 and FW2 in association with the turning of the steering handle 42 in conjunction with the steering. The pinion shaft 61 is an input shaft 91 of the spline coupling device 90 via a universal joint 62, a rotary shaft 63 and a universal joint 64.
Is connected so that torque can be transmitted. The output shaft 92 of the spline coupling device 90 is input to the steering angle ratio conversion mechanism 51 that constitutes the rear wheel steering device 50. The steering angle ratio conversion mechanism 51 is a motor,
The relay rod 52 is displaced in the axial direction according to the steering angle ratio set by a hydraulic device or the like and the rotation of the output shaft 92. For example, the one disclosed in JP-A-61-163064 can be used. Left and right tie rods 53 on both ends of the relay rod 52
Left and right rear wheels via a, 53b and left and right knuckle arms 54a, 54b
RW1 and RW2 are connected, and the rear wheels RW1 and RW2 are steered according to the displacement of the relay rod 52 in the axial direction.

Next, the spline coupling device 90 will be described in detail.
As shown in FIG. 1, the spline coupling device 90 includes a cylindrical input shaft 91, a cylindrical output shaft 92, and a cylindrical output shaft 92.
A first sleeve 93 and a second sleeve 94 assembled on the outer circumference of the input shaft 91, and a third sleeve 95 assembled on the outer circumferences of the output shaft 92 and the second sleeve 94 are main components.

The large-diameter portion 91a on the front side of the input shaft 91 has a twisted spline (the twist angle θ is set to increase the drag force of the spline tooth surface in order to make the drag force larger than the axial thrust force of the rotational torque applied to the input shaft 91). Is set to be tan ^-1 μ degrees or less), the outer spline 91c is integrally formed, and the rear small diameter portion 91b of the coaxial 91 is connected to the output shaft 92
It is supposed to get inside. However, the large diameter part 91a
The distance between the rear end face and the front end face of the output shaft 92 is set to be relatively large. The output shaft 92 is formed with a straight outer spline 92a.

On the inner circumference of the first sleeve 93, an inner spline 93a composed of a twisted spline is formed corresponding to the outer spline 91c, and the spline 93a is the outer spline 9 of the input shaft 91.
It is designed to fit in 1c. The second sleeve 94 is formed in a stepped manner, and the front side large diameter portion 94a thereof has the first sleeve 93.
The outer diameter of the rear small diameter portion 94c is set to be substantially equal to the diameter of the small diameter portion 91b of the input shaft 91, and the second sleeve 94 is attached to the small diameter portion 91b. It is designed to be displaceable on top. Further, on the outer circumference of the second sleeve 94, the outer spline 9 configured to be straight and equal to the outer spline 92a.
4d is integrally formed. On the inner periphery of the third sleeve 95, a straight inner spline 95a corresponding to the outer splines 92a, 94d is integrally formed, and the spline 95a is fitted to both the splines 92a, 94d. Has become.

Further, slits are formed in the first and third sleeves 93, 95 in the axial direction, and the first and third sleeves 93, 95 are assembled on the outer periphery of the first and third sleeves 93, 95 by the tightening devices 70C, 70D, 70E.
The third sleeves 93 and 95 are fixed to the input shaft 91, the second sleeve 94 and the output shaft 92. As shown in FIGS. 2 and 3, the tightening device 70E includes a clamp member 73 surrounding the outer circumference of the third sleeve 95, and a bolt 74 and a nut 75 for tightening the clamp member 73 at right angles to the axial direction of the third sleeve 95. Consists of. The tightening devices 70C and 70D are also configured similarly to the tightening device 70E.

Further, the output shaft 92 is supported on the vehicle body by the connecting shaft bearing assembly 80. This connecting shaft bearing assembly
Reference numeral 80 has a sleeve member 81 penetrating the output shaft 92, and the member 81 rotatably supports the output shaft 92 via a bearing 82 on its inner circumference. Seal rings 83a and 83b are arranged on both sides of the bearing 82, and the sleeve member 8
A labyrinth is formed at both ends of 1 by the cases 84a and 84b fixed to the output shaft 92, and dust is prevented from entering the bearing 82. Further, a ring-shaped member 86 is provided on the outer periphery of the sleeve member 81 via a rubber bush 85, and a bracket 87 is fixed to the ring-shaped member 86. By fixing the bracket 87 to the vehicle body, The connecting shaft bearing assembly 80 is adapted to be fixed to the vehicle body.

In assembling the spline coupling device 90 having such a structure, after mounting the front wheel steering device 40 and the rear wheel steering device 50 on the vehicle, the rear shaft steering device 50 is assembled with the output shaft 92 and the coaxial shaft 92 is connected to the vehicle body by the connecting shaft bearing assembly 80. The inner spline 95a of the third sleeve 95 and the output shaft 92 to which the tightening devices 70D and 70E are temporarily fixed in advance while being supported by the output shaft 92.
The outer spline 92a is fitted and the same spline 95 is moved rearward. Next, the outer spline of the input shaft 91
Pre-welded to 91c by welding 94b and tightening device 90
The inner splines 93a of the first and second sleeves 93, 94 temporarily fixed to C are fitted from the rear side, and the first and second sleeves 9
The small diameter portion 91b of the 3,94 assembled input shaft 91 is connected to the output shaft 92.
Then, the input shaft 91 is connected to the front wheel steering device 40 via the pinion shaft 61, the universal joint 62, the rotary shaft 63 and the universal joint 64.

In such a state, the front wheel steering device 40 and the rear wheel steering device 50 are accurately set to the reference state. In such a state, the outer spline 94d of the second sleeve 94 and the inner spline 95a of the third sleeve 95 are not fitted, and the input shaft 91 and the output shaft 92 are connected so as to be rotatable relative to each other. The shaft 91 and the output shaft 92 rotate freely. Next, the both steering devices 40, 50
Input the first and second sleeves 93, 94 while fixing the input shaft 91 and the output shaft 92 set to the reference rotation position according to the setting of the reference state of FIG. Axis 91
By moving back and forth with respect to the first and second sleeves
Rotate 93, 94 with respect to the input shaft 91 to move the second sleeve 94
The phase of each tooth forming the outer spline 94c is matched with the phase of each tooth forming the outer spline 92a of the output shaft 92, and the third sleeve 95 is moved forward at a position where both phases coincide with each other. The inner spline 95a is fitted to the outer spline 94d of the second sleeve 94. (State of FIG. 4) Then, after the fitting, by tightening the bolts 74 and nuts 75 of the tightening devices 70C, 70D, 70E respectively, the respective sleeves 93, 94, 95 are input by the tightening devices 70C, 70D, 70E. Axis 91
And fixed to the output shaft 92.

As described above, the outer spline 91c of the input shaft 91 and the inner spline 93a of the first sleeve 93 are configured with twisted splines. As a result, after setting the front wheel steering device 40 and the rear wheel steering device 50 to the reference state, both devices 40 Since the two shafts 91 and 92 can be spline-coupled without readjusting 50 and 50, that is, without rotating the input shaft 91 and the output shaft 92, the assembling work of the spline coupling device 90 becomes easy and the assembling accuracy is also improved. It will be good.

Further, when the vehicle is operated after the assembly, if the driver steers the left and right front wheels FW1 and FW2 according to the rotation of the steering wheel 42, the action of the front steering gear box 41 accompanying the steering causes the pinion shaft 61 to move. It rotates in conjunction with the steering, and the torque generated by the rotation is universal joint 62, rotary shaft 63.
And the input shaft of the spline coupling device 90 via the universal joint 64.
Entered in 91. The torque input to the input shaft 91 with the turning of the steering wheel 42 is transmitted to the output shaft 92 via the first to third sleeves 93 to 95, which are spline-coupled, respectively, so that the left and right rear wheels of the vehicle. The steering control of RW1 and RW2 is also good.

Although the spline coupling device 90 is provided near the rear wheel steering device 50 in the above embodiment, the spline coupling device 90 is interposed between the front wheel steering device 40 and the rear wheel steering device 50. It suffices to arrange it in the vicinity of the front wheel steering device 40 or in the vicinity of the center of both the steering devices 40 and 50.

In the above embodiment, the spline coupling device 90 according to the present invention is applied to a front and rear wheel steering vehicle.
The present invention is not limited to this, and the coupling device 90 can be applied to any case where the torque from the driving device is transmitted to the driven device.

[Brief description of drawings]

1 is a cutaway front view showing a spline coupling device according to an embodiment of the present invention, FIG. 2 is a sectional view of a tightening device taken along line II-II of FIG. 1, and FIG. 3 is the same device. FIG. 4 is an exploded partial view showing an assembled state of the spline coupling device of FIG. 1, FIG. 5 is an overall schematic view of a front and rear wheel steering vehicle to which the spline coupling device of FIG. 1 is applied, and FIG. Is a broken front view showing an example of a conventional spline coupling device, FIG. 7 is a broken front view showing another example of a conventional spline coupling device, and FIG.
The drawing is a sectional view taken along the line VIII-VIII in FIG. Explanation of code 90 …… Spline coupling device, 91 …… Input shaft, 92 …… Output shaft, 93,94,95 …… Sleeve, 91c, 92a, 94d …… Outer spline, 93a, 95a …… Inner spline, 40 ...... Front wheel steering device, 50 …… Rear wheel steering device, 70C, 70D, 70E …… Tightening device, 80 …… Connecting shaft bearing assembly.

Claims (1)

[Scope of utility model registration request] 1. A spline coupling device in which a first rotary shaft and a second rotary shaft are spline-coupled so that torque can be transmitted, wherein one end is torsionally spline-coupled to the first rotary shaft,
A rod-shaped first connecting member having a straight outer spline formed on the outer periphery of the other end, and a straight inner spline having a cylindrical shape formed on the inner periphery of the first connecting member at one end. The second fitted to the outer spline of the member, and the other end fitted to the straight outer spline formed on the outer circumference of the second rotating shaft.
A connecting member; a fixing device assembled on the outer circumference of the second connecting member to fix the second connecting member on the outer circumferences of the first connecting member and the second rotating shaft; the first connecting member; A shaft that coaxially connects the second rotating shaft, wherein the first connecting member and the second rotating shaft are connected before the first connecting member and the second rotating shaft are connected by the second connecting member. A spline coupling device comprising: a shaft that allows relative displacement in the axial direction and relative rotation around the axis of the first connecting member and the second rotating shaft while maintaining coaxiality.