JPH03239433A - Fastening device of tire hub nut - Google Patents

Abstract

PURPOSE:To improve an automatic fastening machine and to realize its labor saving, by providing a tire holding device, nut runner, tire alignment following means, tire hub nut position measuring means, etc., in the device automatically fastening the tire hub nut of an automobile. CONSTITUTION:On a truck 80 which travels along the guide rail 81 located on a floor. a lift platform 83 equipped with a rotating shaft slided in the direction orthogonal with the traveling direction of this truck 80 and conformed with a tire cutting angle is provided. On this lift platform 83, a base plate 7 is pivotaly supported tiltably fore and aft and on this base plate 7, a nut runner 36, tire holding device and the attachment 14 brought into contact with the side face of a tire T are equipped. Moreover, a tire alignment following means and tire hub nut position measuring means are provided. For the temporary tightening of the tire T to a vehicle by a robot, the nut runner 36 is made corresponding to the posture of the tire T fitted with the base plate 7 by following mechanically, the hub nut position is mechanically indexed as well and the fatensing is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention 4 relates to an apparatus for automatically tightening a tire hub nut of an automobile.

<Prior art> A device for tightening a tire onto an axle on an automobile assembly line, which transports the tire to the mounting position and temporarily tightens a set nut manually, is disclosed in Japanese Patent Application Laid-Open No. 58-10629.
No. 1, JP-A No. 59-6179, etc.

In addition, as a system that uses robots and automatic machines to perform the entire process from tire supply to nut tightening,
No. 9-42529, Japanese Unexamined Patent Publication No. 61-57401, etc.

<Problems to be Solved by the Invention> Among the above-mentioned conventional techniques, the former has low equipment costs but cannot save labor, while the latter can save labor but requires a large amount of capital investment. In particular, in the latter automatic machine, the means for following the tire posture through tire alignment and the means for fully tightening the tire hub nut regardless of the position of the hub nut are complicated and expensive, and improvement of these is an issue. It has become.

Means for Solving the Problems> The present invention has been made in view of the above-mentioned conventional problems, and its characteristic configuration is that a truck is mounted on a truck that runs along a guide rail laid on a floor. A lifting platform is provided that is slidably guided in a direction perpendicular to the running direction and has a rotation axis that coincides with the tire cutting angle, and a base plate that faces parallel to the running direction of the trolley is provided on the lifting platform. a nut runner that is pivotably supported to be tiltable in the front and back direction and held on the base plate so as to be able to rotate and index and slide forward and backward; and a tire gripping device that grips and centers the tire by abutting a plurality of locations on the outer circumferential surface of the tire. ,
Tire alignment tracking means has an attachment that contacts the side surface of the tire gripped by the tire gripping device, and tilts the base plate according to the cutting angle and camber angle of the tire; and a tire alignment follower that tilts the base plate according to the tire cutting angle and camber angle; The tire hub nut position measuring means detects this with a contactor, measures this with a sensor, and indexes the nut runner.

With the above configuration, in a system in which a robot temporarily fastens tires to a vehicle, the nut runner mechanically follows the posture of the tire to which the base plate is attached, and the hub nut position can also be mechanically adjusted. The nut runner is measured and indexed to the hub nut position, and the hub nut is tightened (full tightening, additional tightening).

Practical Examples> Examples of the present invention will be described below based on the drawings. In FIGS. 1 and 2, reference numeral 80 denotes a cart, which runs along a kite rail 81 (not shown) laid on the floor. This trolley 81 reciprocates within a certain range required for tire tightening. 82 is a travel drive motor.

A lifting platform 83 is slidably guided on the truck 80 in a direction perpendicular to the traveling direction of the truck 80. The configuration of this elevating table 83 is as follows.

A guide rail 63 is provided on the truck 80, and the base 56 is guided on the guide rail 63 via a guide bearing 59 so as to be shiftable.

61 is a cylinder for shifting the lower base 46 and the trolley 8
0, and this shift cylinder 61 and the base 56 are connected via a bracket 60.

A lower base 46 is fixedly provided on the base 56, and a guide member 45 extending in the vertical axis direction is fixedly provided across the lower base 46 and the base 56. This guide f! ? i4
5, a guide rod 44 is guided so as to be movable up and down.
An upper base 43 is fixed to the upper end of this guide rod 44. 48 is a cylinder for raising and lowering the upper base 43, and is connected to the upper base 43 via a spring 47 for maintaining a neutral raising and lowering position.

A hollow rod 50 for following the tire turning angle is fixed to the front end of the lower base 46 via a bracket 49.

This hollow rod 50 is rotatably held on a shaft 54 fixed to a bracket 55 via bearings 52,53.

A lock receiver 51 is attached to the rear end of the lower base 46, and correspondingly, a guide bracket 57 for cutting angle centering that holds a centering shaft 64 is mounted on the base 56, and a lock cylinder 58 is used for forward and backward movement. A lock pin 62 is provided.

A bracket 42 is fixedly installed on the front end of the upper base 43, and a base plate 7 whose surface is oriented parallel to the traveling direction of the truck 80 is tiltable in the front and rear directions around the shaft 65 via a shaft 65. is supported by. This shaft 65 has a centering spring 66
is inserted.

A roller 9 having V grooves is rotatably supported at a plurality of locations on the rear surface of the base plate 7, and a nut runner 3 is attached to the roller 9.
Six rotating disks 22 are held. This disk 22
A worm gear ring 20 that is concentric with a disk 22 is fixedly attached by bolts 21 . This worm gear ring 20 has a motor 1 for indexing and turning the nut runner 36.
A worm gear 12, which is rotationally driven at 1, is engaged with the worm gear 12.

Further, a camber angle support receiving disk 24 is fixed to the disk 22 by bolts 25 via a plurality of rods 23 whose axes are parallel to the nut runner 36 . A nut runner 36 is held on this rod 23 via a mounting base 29 and a slide guide bearing 28 so that it can move forward and backward and rotate integrally with the disk 22. 27 is Natsutranna 36
This is a cylinder for forward and backward shifting. In addition, 30 is a bracket for mounting the four nut runners 36, 31 is a socket guide, 32 is a soget extension, 33 is a socket, 34 is a mounting bracket for the socket guide 31 and a sensor shift cylinder to be described later, and 35 is a nut runner mounting bracket. shows.

The camber angle support disc 24 is provided with a lock receiver 26 for fixing the camber angle to a neutral position, and a lock bin 37 that engages and disengages from the lock receiver 26 on the upper base 43 of the lifting platform 83 is moved forward and backward by a cylinder 38. It is possible to use the equipment.

Further, the upper base 43 is provided with a camber angle follower attachment 39 that comes into contact with the outer peripheral surface of the camber angle support disk 24 and comes into contact with the bullet.

40 is a spring for cushioning when following camber angle, 4
1 is a guide member of the attachment 39.

On the front surface of the base plate 7, a disk 19 for clamping a tire is rotatably supported at three points on the outer periphery. This disk 19 is attached to the base plate 7 with the bracket 8
It is driven to reciprocate and rotate at a required angle by a clamp cylinder 10 fixed at . Further, on the plate surface of the disc 19, a guide spring 19a having an inclination angle toward the outer periphery is provided at a distance of 3 m on the circumference.

On the other hand, the slide base 3 is slidably guided in the radial direction by guide rails 6 at three locations on the outer periphery of the base plate 7, and has a cam floor 5 that slides on the guide spring 19a of the disk 19. A clamp roller 1 is attached which comes into contact with the outer circumferential surface of the tire T via the clamp roller 1. In addition, a bracket 15 is attached to the slide base 3.
is fixed to this bracket 15, and an attachment 14 that abuts the side surface of the tire T is always urged in the forward direction by a spring 16 and held so as to be movable forward and backward. 1
7 is a guide bin for the attachment 14, and 18 is a proximity sensor for detecting when the attachment 14 moves forward or backward.

Next, the hub nut position measuring means is shown in Figures 3 and 4.
This will be explained with a diagram. One sensor shift cylinder 67 for steel wheels and one for aluminum wheels is attached to the bracket 34, and a bracket 68 is fixed to the piston rod. For steel wheels, as shown in FIG. 3, the bracket 68 includes a contact 69 that moves backward in contact with the hub nut N, and a spring 70 that presses the contact 69 toward the forward turning end.
A sensor 71 operated by the contactor 69 is provided. Further, for aluminum wheels, as shown in FIG. 4, a proximity sensor 73 facing the hub nut N is attached to the bracket 68.

The reason for separating the hub nut position sensors for steel wheels and aluminum wheels as described above is as follows.

In steel wheels, the amount of protrusion of the hub nut N is large due to the cross-sectional shape of the wheel, and in the case of aluminum wheels, the amount of protrusion of the hub nut N is small.

Therefore, if the protruding amount is large, it is possible to detect the position using the contact 69 that comes into contact with the hub nut N, but for the hub nut N of an aluminum wheel with a small protruding cover, it is difficult to detect the position using the contact 69. Using a proximity sensor 73 as shown in , the sensor shift cylinder 67 approaches the hub nut N, the bracket 34 is scanned by rotating the proximity sensor 73 with the motor 11, and the voltage output waveform at that time is read. The position of the hub nut N is determined by comparing it with a pre-stored waveform.

Since the present invention is constructed as described above, the entire apparatus is moved forward to the left in FIG. 1 using the shift cylinder 61. At this time, when the tire T has a cutting angle, one of the three attachments 14 is attached as shown in FIG. 5A.
Attachment 1 that touches the curved surface of the tire T, and further touches the measuring surface of the tire T as the entire device advances.
Slide 4 or move backwards. This attachment 1
4 reaches the end of the backward stroke, the base plate 7 begins to tilt forward about the shaft 65 as shown in FIG.
As shown in , it hits the side of the tire T and completes tracking of the turning angle.

Further, in following the camber angle, as shown in FIG. 6, the base plate 7 is tilted backward by the attachment 14 in the same manner as described above.

After following the above-mentioned cutting angle and camber angle, the tire T is clamped by the clamp roller 1, and the hub nut position sensor rotates the bracket 34 to which the nut runner 36 is attached and indexes it to correspond to the hub nut position. 36 is moved forward to fully tighten and further tighten the hub nut N. At this time, it goes without saying that the axis of the nut runner 36 is coaxial with the axis of the hub bolt due to the following operation of the cutting angle and the camber angle.

In the following operation of the cutting angle, the lifting table 83 maintains the weight and balance of all the parts installed on the upper base 43. Furthermore, the spring 47 is set so that the contraction amount is 0 when the abapel 43 and the lower base 46 are in a neutral state. Therefore, if the tire T is lower than the neutral position when the tire T is clamped, a force pushing down the device will act.
When the heights match (tire center and device center match), the spring 47 is compressed by that amount. After the unlamp, it is pushed up by the spring 47 to the neutral position. On the contrary, when the tire T is at a high position, the spring 47 does not act and the cylinder 48 returns it to the neutral position.

To lock the alignment, the bracket 51 is taken out from the lower base 46 in relation to the steering angle, and the lock pin 6 at the end of the rod of the cylinder 58 is attached to the base 56.
2 into the lock receiver 51 and lock it.

In addition, the lock pin 37 at the tip of the rod of the cylinder 38, which is attached to the upper base 43, is attached to the lock receiver 26 on the bracket 26 protruding from the disc 24 in the same way as for camber angle tracking.
Insert and lock.

Further, the attachment 39 restores the posture of the device upon completion of tightening the hub nut when following the camber angle shown in FIG. 6, and pushes up the disk 24 so as to maintain the horizontal state at all times.

<Effects of the Invention> As described above, according to the present invention, the entire device such as the tire gripping device and the nut runner can be used to perform tire alignment (handle angle, camber angle), that is, to measure the position of the hub nut and the means for following the tire posture. Since all the means are mechanically configured, the configuration of the device for measuring and controlling the tire posture and the motor, gears, etc. of the follow-up mechanism is omitted, which has the effect of simplifying the structure and reducing the cost, compared to conventional devices. This problem was solved.

[Brief explanation of drawings]

Fig. 1 is a surface measurement diagram of the present invention, Fig. 2 is a rear view, Figs. 3 and 4 are side views of the hub nut position measuring device, Fig. 5 is an explanatory diagram of the cutting angle following operation, and Fig. 6 is FIG. 3 is an explanatory diagram of a camber angle following operation. 1... Clamp roller, 7... Base plate, 1
0... Cylinder for clamp, 14... Attachment, 19... Disc for clamp, 22... Disc for rotating nut runner, 36... Nut runner, 43...
Upper base, 46... Lower base, 48... Lifting cylinder, 56... Base, 61... Shift cylinder, 67... Sensor shift cylinder, 69... Contact, 71... -Sensor, 73... Proximity sensor, 80... Trolley, 83... Lifting platform. Patent applicant Kanto Jidosha Kogyo Co., Ltd. 71 Figure 3 Figure 4 172- Figure 5

Claims (1)

[Claims] A lifting platform is provided on a truck that runs along a guide rail laid on the floor, and is slidably guided in a direction perpendicular to the running direction of the truck and has a rotation axis that coincides with the tire cutting angle. A base plate facing parallel to the running direction of the cart is pivoted on the lifting platform so as to be tiltable in the front and back direction, and a nut runner held on the base plate so as to be able to rotate and index and slide forward and backward, and the outer circumferential surface of the tire. It has a tire gripping device that grips and centers the tire by coming into contact with a plurality of locations, and an attachment that comes into contact with the side surface of the tire gripped by the tire gripping device, and the base plate is attached to the tire's cutting angle and camber angle. The tire alignment tracking means tilts according to the tire alignment, and the tire hub nut position measuring means detects the position of the hub nut from a wheel that differs depending on the type of wheel using a contact, measures this with a sensor, and indexes the nut runner. A tire hub nut tightening device characterized by: