JPS6047121B2 - wheel mounting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wheel mounting device for assembling wheels to drums on a vehicle assembly line.

The idea was to grasp the wheels with machine hands and assemble them onto the drum. However, if the wheel is released after just passing the drum's hub bolt through the wheel's hub hole, the wheel will tilt due to its own weight, making it difficult to tighten the nut. In the worst case scenario, the wheel may fall off before the nut begins to screw into the hub bolt. On the other hand, it is conceivable that the wheel is held until the nut is tightened. However, when using this method, it is necessary to push the wheel into the drum side in advance to the position it will be in when the assembly is completed, or to push the wheel into the drum side as the screw tightening progresses, making it difficult to operate the machine hand. It becomes very difficult. SUMMARY OF THE INVENTION Therefore, the present invention provides a wheel mounting device that has a simple configuration and can safely and reliably assemble a wheel to a drum.

In the present invention, a nut runner is disposed in the center of a wheel gripping means that centripetally holds the wheel from the outside, and when at least the socket of this runner hits a hub bolt provided on the drum and sinks by the length of the nut's lead stroke, the nut runner At the same time, after the required time for the nut to engage with the tip of the hub bolt has elapsed, the wheel gripping means is opened and the nut tightening operation is continued.

Hereinafter, one embodiment shown in the figure will be described in detail.

1 is a wheel with a hub hole 2 formed in the wheel portion; 35 is a drum attached to the tip of the wheel 4; the end face thereof is provided with a hub bolt 5 passing through the hub hole 2.

Reference numeral 6 denotes a wheel gripping means for gripping the wheel 1 from the outside, and as is clear from the figure, it is configured to open and close centripetally using a Scott Stratssel mechanism and a parallel link mechanism.

7 is a cylinder mechanism for opening and closing the pawl 8 of the wheel gripping means 6.

The pawl 8 is held horizontally by a parallel link mechanism, and the top and bottom of the pawl 8 are held horizontally by a scott trassel mechanism in which one of the parallel links and another link half the length of the parallel link are combined in a 1-shape. Operation is allowed. The claw 8 closes when one end of the parallel link is moved to the right in FIG. 1 by the cylinder mechanism 7. Reference numeral 9 denotes a roller provided inside the pawl 8, which rotates the gripped wheel 1 by the action of the roller drive source 10 and aligns the phase between the hub hole 2 and the hub bolt 5.

Numeral 11 is a nut runner disposed at the center of the wheel gripping means 6, and the structure of the tip portion 12 of this nut runner is as shown in FIG.

Further, the wheel gripping means 6 is configured to be movable back and forth, right and left, and up and down by a cylinder mechanism with three or more axes (not shown). In FIG. 2, which is an enlarged view of the tip end portion 12 of the nut runner 11, 13 is a drive shaft of a nut tightening motor within the nut runner 11. As shown in FIG.

The motor and drive shaft 13 serve as rotation drive means for rotating the socket 17 included in the tip portion 12. It is what it is. Reference numerals 14 and 15 denote an engager and a spring receiver spline-fitted to the drive shaft 13, and a compressed spring 16 is disposed between these two.

17 is a socket that holds and turns a nut 18 for tightening the hub bolt 5, and this socket! Volume 17
and the engaging element 14 are swingably connected by a cross-shaped pin 19.

That is, the pin on one axis of the cross shape is connected to the engaging element 14, and the pin on the other axis is connected to the socket 17. A spring 20 is interposed between the engaging element 14 and the sockets 17 and 3, and serves to align the axis of the socket 17 with the axis of the drive shaft 13.

21 is a magnet for adsorbing and fixing the nut 18 placed at the bottom of the socket 17.

The nut 18 attracted to the socket 17 is attached to the hub bolt 4
, the spring 16 is compressed and almost the entire tip portion 12 including the socket 17 moves relatively in the axial direction of the hub holder 5. This movement is called sinking, and the sinking means for making this sinking possible is the spring 16 and the spline fitting structure between the drive shaft 13 and the engaging element 14. Reference numeral 22 denotes an outer cylinder with a tapered cylindrical surface attached to the engager 14. When the socket 17 sinks by the lead stroke of the nut 18 as described above, the lever 23 hits the outer cylinder 22 and the limit switch 24 Press.

The lead stroke is the hub bolt 5 of the nut 18.
The nut 18 is a tightening allowance for the hub bolt 5.
After the screw engages, the screw advances in the axial direction by this lead stroke, and the screw tightening is completed at that point. The tapered cylindrical surface of the outer cylinder 22, the lever 23, and the limit switch 24 correspond to sinking detection means for detecting sinking of the socket 17. When sinking is detected and the limit switch 24 is activated, a signal from the limit switch 24 is received, and the rotation operation of the drive shaft 13 of the nut tightening motor is started, and the socket 17 also begins to rotate.

Reference numeral 25 denotes a delay means, which stops the wheel grip after the drive shaft 13 rotates and the nut 18 engages (bites) with the tip of the hub bolt 5 after receiving the signal from the limit switch 24. A signal is issued to open the means 6.

Next, the operation of the wheel mounting device configured as described above will be explained.

First, when the vehicle reaches a predetermined position, a means (not shown) regulates the rotational phase of the drum 3 and corrects the hub bolt 5 to a predetermined position. Along with this, the center position of the drum 3 is also determined. On the other hand, the wheel gripping means 6 receives the wheel 1 and the nut 18 from a wheel supply means and a nut supply means (not shown). When the wheel 1 is gripped, the roller drive source 10 is operated to adjust the hub hole 2 of the wheel 1 to match the predetermined phase of the hub bolt 5. For this, an engaging pin protruding in accordance with the predetermined phase of the hub bolt 5 is provided, for example, in parallel with the nut runner 11, and the engaging pin engages with the hub hole 2, and the roller drive source 10 is activated. When the rotation is stopped, it can be considered that phasing is completed. After correcting the phase of the wheel 1 in this manner, the wheel gripping means 6 is moved to move the wheel closer to the drum 3 in accordance with the data indicating the center position of the drum 3 measured in advance. Hub bolt 5 passes through hub hole 2,
It hits the nut 18 in the socket 17, and also the nut 1
When the socket 17 is pushed in the axial direction of the hub bolt 5 by the lead stroke of 8, the limit switch 2
4 is closed. The signal from the limit switch 24 stops the movement of the wheel gripping means 6 and starts the tightening operation of the nut runner 11. Along with this, the rotating shaft 13 of the nut runner 11 rotates, the socket portion 12 rotates, and tightening of the nut 18 to the hub bolt 5 is started. At the same time, a signal is also input to the delay means 25, and the delay means 25 sends out a signal for opening the wheel gripping means 6 after a predetermined time has elapsed. At this time, since the nut 18 is already engaged with the tip of the hub bolt 5, there is no fear that the wheel 1 will fall off the drum 3 even if the wheel gripping means 6 is opened. Further, when the nut 18 is tightened, the socket 17 is pushed back toward the drum 3 by the action of the spring 16 as the tightening progresses. After a certain period of time has passed and it is confirmed that the nut 18 has been tightened, the operation of the nut runner 1 is stopped.
The wheel gripping means 6 is separated from the drum 3. This completes a series of wheel assembly operations. In the embodiment described above, in order to facilitate the engagement of the nut 18 with the tip of the hub bolt 5 at the initial stage of screw tightening, the roller 9 is slid in the axial direction so that the gripped wheel 1 can easily move toward the drum 3. All you have to do is configure it to work.

As is clear from the above description, the present invention provides a wheel gripping means that grips a wheel centripetally, corrects the gripped wheel to the same rotational phase as the drum, and then brings it closer to the drum. Place the nut runner socket in the center so that it faces the tip of the hub bolt that protrudes through the hub hole. Then, the wheel gripping means is pressed against the drum side, and when the position of the socket sinks by the lead stroke of the nut, this is detected and the tightening operation of the nut runner is started.

At the same time, the delay means is operated, and after the time required for the nut to engage with the tip of the hub bolt has elapsed, the wheel gripping means is opened to release the wheel. Therefore, according to the present invention, after detecting that the hub bolt has passed through the hub hole of the wheel, the nut runner starts tightening the nut, and releases the wheel after waiting for the nut to engage with the hub bolt. This prevents the wheel from coming off the hub bolt and allowing assembly work to be carried out safely and reliably.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram for explaining one embodiment of the present invention, and FIG. 2 is a sectional view showing a socket portion of a nut runner. 1...Wheel, 2...Hub hole, 3...
...Drum, 5...Hub bolt, 6...
Wheel gripping means, 11...Nut runner, 17
... Socket, 16... Spring serving as an element of the sinking means, 23, 24... Lever and limit switch serving as an element of the sinking detection means, 13...
...Drive shaft that rotates the socket, 25...
Delay means.

Claims (1)

[Claims] 1. In a device that grips a wheel centripetally and assembles the wheel to a drum by passing a hub bolt of the drum through the hub hole of the wheel, a wheel gripping means that grips the wheel centripetally, and a wheel gripping means provided at the center of the wheel gripping means are provided. a nut runner, a sinking means that allows at least a socket of the nut runner facing the hub bolt to sink in the axial direction of the hub bolt, and a nut held in the socket that abuts the hub bolt by the lead stroke of the nut. , a sinking detection means for detecting that the socket has sunk, a rotational drive means for the socket that starts operating in response to a signal from the sinking detection means, and a nut attached to the tip of the hub bolt. A wheel mounting device comprising: delay means for delaying release of the wheel gripping means by a time necessary for engagement.