JPH0724993B2 - Tire hub nut tightening device - Google Patents

Description

The present invention relates to a device for automatically tightening a tire hub nut of an automobile.

<Prior Art> Japanese Patent Application Laid-Open No. 58-106291 and Japanese Patent Application Laid-Open No. 59-6179 disclose a device for tightening a tire on an axle in an automobile assembly line that carries the tire to a mounting position and temporarily sets a set nut manually. It is published in the issue.

In addition, as a method for consistently performing from the supply of tires to the tightening of nuts by a robot or an automatic machine, Japanese Patent Laid-Open No. 60-42519-425
No. 29, JP-A No. 61-57401 and the like.

<Problems to be Solved by the Invention> In the above conventional technique, the former one has a low equipment cost, but the labor saving cannot be achieved, and in the latter, the labor saving can be achieved, but the equipment investment is enormous. Particularly, in the latter automatic machine, the means for following the tire posture by the alignment of the tire and the means for permanently tightening the tire hub nut regardless of the position of the hub nut are a control device for measuring the tire posture and a tire posture follow-up mechanism by a motor or gear structure. Is complicated and expensive, and improvement of this is an issue.

In view of the above-mentioned problems, the present invention provides a tightening device for a tire hub nut, which allows the follower means for the tire posture of a nut runner to be positioned at an appropriate position at the same time for both the tire cutting angle and the camber angle by a simple mechanical type. The purpose is to

<Means for Solving the Problems> The present invention has been made in view of the above-described problems of the related art, and a characteristic configuration thereof is that a trolley that travels along a guide rail laid on a floor is mounted on the trolley. Provided is an elevator that is slidably guided in a direction orthogonal to the plane with respect to the traveling direction, and is pivotally supported by a shaft that coincides with the kingpin on the same axis as the kingpin so as to follow the tire cutting angle. A nut runner that pivotally supports a base plate so as to be tiltable in the front-rear direction with a surface parallel to the traveling direction of the carriage on the lifting platform, and a nut runner that is held on the base plate so as to allow swivel indexing and forward / backward sliding, and an outer peripheral surface of the tire A tire gripping device for gripping and centering the tire by contacting a plurality of positions of the tire, and an contact for contacting the side surface of the tire gripped by the tire gripping device. And a camber angle follow-up means for tilting the base plate according to the camber angle, and a sensor for advancing and retracting by a sensor shift cylinder to detect the position of the hub nut from the wheel that differs depending on the type of the wheel. And a tire hub nut position measuring means for indexing the nut runner.

<Operation> With the above configuration, the attachment that abuts the side surface of the tire simultaneously performs the turning movement of the lifting platform that follows the tire cutting angle and the tilting of the base plate that follows the camber angle. And both at the same time, corresponding to the proper position.

<Examples> Examples of the present invention will be described below with reference to the drawings. In FIGS. 1 and 2, reference numeral 80 denotes a dolly, which runs along a guide rail 81 laid on the floor (not shown).
This trolley 81 travels back and forth within a certain range required for tire tightening. Reference numeral 82 is a traveling drive motor.

On the carriage 80, a lift 83 is guided slidably in a direction orthogonal to the traveling direction of the carriage 83. The structure of this lifting platform 83 is as follows.

A guide rail 63 is provided on the carriage 80, and a base 56 is guided on the guide rail 63 via a guide bearing 59 in a shiftable manner. Reference numeral 61 denotes a shift cylinder of the lower base 46, which is installed in the carriage 80, and the shift cylinder 61 and the base 56 are connected via a bracket 60.

A lower base 46 is fixedly mounted on the base 56, and a guide tube extending in the vertical axis direction extends between the lower base 46 and the base 56.
45 are fixed. This guide cylinder 45 has a guide rod
An upper base 43 is fixed to the upper end of the guide rod 44. Reference numeral 48 denotes a lifting cylinder for the upper base 43, which is connected to the upper base 43 via a spring 47 for maintaining the lifting position neutral.

A hollow load 50 for following a tire cutting angle is fixed to the front end of the lower base 46 via a bracket 49. This hollow rod 50 has a shaft 54 fixed to a bracket 55.
Is rotatably held by bearings 52 and 53.

The tire cutting angle is a steering angle that rotates about the kingpin at the axle end, the shaft 54 is aligned with the kingpin on the same axis, and the lower base 46 follows the shaft 54 as a fulcrum in the tire cutting angle direction. It is possible to turn and move.

A lock receiver 51 is attached to the rear end of the lower base 46. Correspondingly, a forward / backward operation is performed by a corner bracket centering guide bracket 57 holding a centering shaft 64 on a base 56 and a lock cylinder 58. Lock pin 62 is provided.

A bracket 42 is fixedly mounted on the front end of the upper base 43, and a base plate 7 whose surface is parallel to the traveling direction of the truck 80 via a shaft 65 is tiltable in the front-rear direction about the shaft 65. Is pivoted to. A centering spring 66 is inserted in the shaft 65.

Rollers 9 having V-grooves are rotatably supported at a plurality of positions on the rear surface of the base plate 7, and the nut runner 36 is attached to the rollers 9.
The disc 22 for turning is held. A worm gear ring 20 concentric with the circular plate 22 is fixed to the circular plate 22 with bolts 21. A worm gear 12 rotatably driven by a motor 11 for indexing and turning a nut runner 36 meshes with the worm gear ring 20.

Further, a camber angle support receiving disk 24 is fixed to the disk 22 with bolts 25 via a plurality of rods 23 having an axis parallel to the nut runner 36. The nut runner 36 is attached to the rod 23 by a mounting base 29 and a slide guide bearing 28.
It is held so as to be able to move forward and backward through the and and to rotate integrally with the disc 22. 27 is a nut runner 36 and 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 socket extension, 33 is a socket, 34 is a socket guide 31 and a sensor shift cylinder mounting bracket described later, and 35 is a nut runner mounting bracket. Show.

The camber angle supporting disc 24 is provided with a lock receiver 26 for fixing the camber angle neutral position.
A lock pin 37 that engages with and disengages from the lock receiver 26 is mounted on an upper base 43 of 83 by a cylinder 38 so that the lock pin 37 can move forward and backward. Further, the upper base 43 is provided with a camber angle follow-up attachment 39 that is in contact with the outer peripheral surface of the camber angle supporting disk 24 by a bullet. 40 is a cushion spring for following the camber angle, 41 is an attachment 39
Is a guide member.

A disk 19 for clamping a tire is rotatably supported on the entire surface of the base plate 7 at three outer circumferences. The disk 19 is reciprocally rotated at a required angle by a clamp cylinder 10 fixed to a base plate 7 by a bracket 8. The plate surface of the disc 19 is provided with guide grooves 19a having an inclination angle toward the outer peripheral edge at three locations on the circumference.

On the other hand, the slide base 3 is slidably guided in the radial direction by the guide rails 6 at three positions on the outer periphery of the base plate 7, and has a cam floor 5 that slides in the guide groove 19a of the circular plate 19, and the clamp arm 2 is attached to this. The clamp roller 1 that is in contact with the outer peripheral surface of the tire T is attached thereto. A bracket 15 is fixedly mounted on the slide base 3, and an attachment 14 that abuts the side surface of the tire T is held by the spring 16 so as to be constantly biased in the forward direction by a spring 16 so as to be able to move forward and backward. Reference numeral 17 is a guide pin of the attachment 14, and 18 is a proximity sensor for detecting when the attachment 14 moves forward and backward.

Next, the hub nut position measuring means will be described with reference to FIGS.
A description will be given by adding a figure. One sensor shift cylinder 67 is attached to the bracket 34, and one sensor shift cylinder 67 is attached to the aluminum wheel. The bracket 68 is fixed to the piston rod. In the case of a steel wheel, as shown in FIG. 3, a contactor 69 that moves backward by contacting the hub nut N with the bracket 68, a spring 70 that presses and biases the contactor 69 toward the forward swing end, and the contactor. The sensor 71 is operated by 69. Also, for aluminum wheels, as shown in FIG.
A proximity sensor 73 facing the hub nut N is attached to the.

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

A steel wheel has a large amount of protrusion of the hub nut N due to the sectional shape of the wheel, and an aluminum wheel has a small amount of protrusion of the hub nut N. Therefore, if the protrusion amount is large, the position can be detected by the contact 69 contacting the hub nut N, but it is difficult for the hub nut N of the aluminum wheel having the small protrusion amount to detect the position by the contact 69. The proximity sensor 73 as shown in FIG.
Is rotated by the motor 11 to scan the proximity sensor 73, and the voltage output waveform at that time is read and compared with the waveform stored in advance to determine the position of the hub nut N.

Since the present invention is configured as described above, the shift cylinder 61 moves the entire apparatus forward to the left in FIG. At this time, when the tire T has a corner, it is shown in FIG.
As shown in (1), one of the three attachments 14 hits the side surface of the tire T, and the attachment 14 that touches the side surface of the tire T slides backward as the entire apparatus advances. When the attachment 14 reaches the end of the backward stroke, the lifting platform 83 starts the follow-up turning movement in the tire cutting angle direction with the shaft 54 as the fulcrum, and the other 2
The attachment 14 at the point hits the side surface of the tire T as shown in FIG.

Further, in tracking the camber angle, as shown in FIG. 6, the base plate 7 is tilted backward by the attachment 14 with the shaft 65 as a fulcrum.

After the cutting angle and the camber angle have been tracked, the tire T is clamped by the clamp roller 1 and the nut runner 36 is mounted on the bracket by the hub nut position sensor.
34 is turned and indexed so as to correspond to the position of the hub nut, and then the nut runner 36 is moved forward to operate the hub nut N.
The main tightening and the retightening are performed. At this time, it goes without saying that the axis line of the nut runner 36 is the same as the axis line of the hub bolt due to the following movements of the cutting angle and the camber angle.

In the following operation of following the cutting angle, the lifting platform 83 keeps all weights and balance states of the respective devices mounted on the upper base 43. Further, the spring 47 is set so that the contraction margin is 0 when the upper base 43 and the lower base 46 are in the neutral state. Therefore, when the tire T is clamped, and the tire T is lower than the neutral position, a force that pushes down the device acts, and when the heights match (the tire center and the device center match), the spring 47 is pressed. Is reduced by that amount. After unclamping, it is pushed up by the spring 47 to the neutral position. On the contrary, when the position of the tire T is high, the spring 47 does not act and the cylinder 48
To return to the neutral position.

For alignment-following lock, the bracket 51 is taken out from the lower base 46 with respect to the steering wheel turning angle, and the lock pin 62 at the rod tip of the cylinder 58 attached to the base 56 is inserted into the lock receiver 51 and locked.

Further, similarly to the camber angle tracking, the lock pin 37 at the rod tip of the cylinder 38 attached to the upper base 43 is inserted into the bracket 26 protruding from the disk 24 and locked in the lock receiver 26.

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

<Effects of the Invention> As described above, according to the present invention, the tire gripping device, the nut runner, and the like as a whole are aligned with the tire at a tire cutting angle and a camber angle, that is, an attachment for abutting a means for following the tire posture on the side surface of the tire. At the same time, the rotation of the lift table to follow the tire angle and the tilting of the base plate after the camber angle are performed simultaneously, and the entire device such as the nutrunner can be positioned at the proper position for both the tire angle and the camber angle at the same time. There is no time lag when performing positioning corresponding to the bending angle and the camber angle, and quick positioning according to the tire cutting angle and camber angle can be obtained with a simple structure.

[Brief description of drawings]

FIG. 1 is a side view of the present invention, FIG. 2 is a rear view, FIGS. 3 and 4 are side views of a hub nut position measuring device, FIG. 5 is an explanatory view of a cutting angle tracking operation, and FIG. 6 is a camber. It is explanatory drawing of an angle following operation. 1 ... Clamp roller, 7 ... Base plate, 10 ...
Clamping cylinder, 14 ... Attachment, 19 ... Clamping disc, 22 ... Nutrunner rotating disc, 36 ...
… Nutrunner, 43 …… Upper base, 46 …… Lower base, 48 …… Lifting cylinder, 56 …… Base, 61 …… Shift cylinder, 67 …… Sensor shift cylinder, 69 ……
Contactor, 71 ... Sensor, 73 ... Proximity sensor, 80 ... Cart, 83 ... Lifting platform.

Claims (1)

[Claims] 1. A guide is slidably guided on a carriage running along a guide rail laid on the floor in a direction perpendicular to the traveling direction of the carriage, and coincides with the kingpin on the same axis. A shaft is provided with a lifting platform that is pivotally supported so as to follow the tire cutting angle around the kingpin, and the base plate is pivotally mounted on the lifting platform with its surface parallel to the traveling direction of the carriage. A nut runner, which is supported by the base plate so as to be pivotally indexed and slidable forward and backward, and a tire gripping device for gripping and centering the tire by abutting a plurality of positions on the outer peripheral surface of the tire, and a gripping device for gripping the tire gripping device. And a camber angle follower for tilting the base plate according to the camber angle And a tire hub nut position measuring means for moving forward and backward by the sensor shift cylinder and detecting the position of the hub nut from a wheel that differs depending on the type of the wheel, and measuring the nut runner to index the nut runner. A device for tightening tire hub nuts.