JPH0589006U - Automatic tire tightening device - Google Patents

Abstract

(57) [Abstract] [Object] The present invention is to grip a tire gripping arm with a tire gripping arm by allowing a pad to be pressed against the wall surface of the tire to float freely in a vertical plane to follow the tire gripping arm. Provided is an automatic tire tightening device capable of accurately centering a tire. [Structure] A plurality of tire gripping arms 10 arranged at equal intervals and expanding and contracting in a radial direction, and a tire gripping arm integrally provided with the tire gripping arm having a surface perpendicular to the tire gripping surface of the tire gripping arm. Putt 12 that abuts the wall surface
And a nut runner 13 for tightening a hub nut.
2 is always centripetal in a vertical plane, and is supported by a bullet so that it can float.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device for automatically tightening a tire after a tire is automatically attached to a hub of an automobile (after temporary tightening).

[0002]

[Prior Art]

 In the automobile assembly line, a tire retightening device that automatically retightens the tire on the hub is used. This device has a plurality of tire gripping arms that expand and contract in the radial direction on a carriage that can travel between the vehicle body that has been stopped on a traveling carriage and the wheelbase, and that is perpendicular to the tire gripping surface of the tire gripping arms. The pad is provided integrally with the tire gripping arm and has a surface that comes into contact with the tire wall surface, and a nut runner that tightens the hub nut.

[0003]

[Problems to be solved by the device]

 As shown in FIG. 5, the pad contacting the wall surface of the tire has a structure in which the pad 12 is fixed to the tire gripping arm 10 by a surface perpendicular to the tire gripping surface of the tire gripping arm 10. The tire 11 is pressed against the wall surface of the tire 11 for centering and positioning in a vertical plane. However, as shown in FIG. 6, when the tire 11 is pressed against the wall surface of the tire 11 and is clamped, slippage occurs. There was a case that the center was misaligned and the centering could not be performed.

An object of the present invention is to provide an automatic tire tightening device that solves the above-mentioned conventional problems.

[0005]

[Means for Solving the Problems]

 The gist of the present invention for achieving the above object is to provide a plurality of tire gripping arms arranged at equal intervals on a main body plate and expanding and contracting in the radial direction, and a surface perpendicular to the tire gripping surface of the tire gripping arms. In a tire automatic tightening device including a pad that is integrally formed with a tire gripping arm and that abuts against a wall surface of a tire, and a nut runner for tightening a hub nut, the pad is a tire wall abutting plate. The tire wall abutting plate is constituted by an outer cylinder which is always centrically biased in a vertical plane by a leaf spring or the like and which is supported by a bullet so that it can float.

[0006]

[Action]

 With the above configuration, when the pad is pressed against the wall surface of the tire and the tire is clamped by the tire gripping arm, free floating in the vertical direction of the pad enables good followability and high-precision centering.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a traveling carriage that travels on a floor along a guide rail between wheel bases of a vehicle body (not shown), and 2 is on the traveling carriage 1 in a direction orthogonal to the traveling direction of the traveling carriage 1. It is a movable table which is guided by a guide rail 3 provided and is moved forward and backward with respect to the vehicle body (not shown) by a forward and backward movement cylinder 4. Reference numeral 5 is a support base which is guided by a guide shaft 7 on the moving base 2 and is vertically movable in a balanced manner by a balancing cylinder 6.

An automatic tire tightening unit is installed on the front support base 5. That is, a plurality of tire gripping arms 10 that expand and contract in the radial direction are arranged at equal intervals on a main body plate 8 having a vertical surface whose front end portion of the support base 5 is a pivot 9 and whose angle can be adjusted in the front-rear direction. A pad 12 having a surface perpendicular to the tire gripping surface of the tire 10 and contacting the wall surface of the tire 11 is provided integrally with the tire gripping arm 10. Further, a nut runner 13 having a plurality of sockets 13a is arranged at the center of the body plate 8. Reference numeral 14 is a cylinder angle correcting cylinder of the body plate 8, and 15 is a nut runner and a sensor shift cylinder.

The automatic tire tightening device of the present invention is characterized in that it is provided with a pad 12 that can be centered and floated in a vertical plane at all times. As shown in FIGS. 2 to 4, a tire wall abutting plate 12b having a shaft 12c protruding from the center thereof is slidably abutted on the vertical side surface of the outer cylinder 12a so that the shaft 12c can be prevented. The insertion position is within the outer cylinder 12a. A plurality of leaf springs 12d are radially arranged between the shaft 12c and the inner peripheral surface of the outer cylinder 12a, one end of which is fixed to the shaft 12c and the other end of which is fixed to the inner peripheral surface of the outer cylinder 12a. It is a configuration. In addition to the leaf spring 12d, a coil spring may be used instead.

Since the present invention has the above-described structure, the tire gripping arm 10 grips the outer peripheral surface of the tire 11, the pad 12 is pressed against the wall surface of the tire 11, and the nut runner and the sensor shift cylinder 15 are used. The nut runner 13 is moved forward, and the tire gripped by the tire gripping arm 10 is automatically tightened to the hub of the axle with the required tightening torque by the hub nut.

Therefore, in the present invention, the tire wall contact plate 12b of the pad 12 is normally centered by the plate panel 12d in the center of the outer cylinder 12a as shown in FIG. When the pad 12 is pressed against the wall surface of the tire 11 by gripping the outer peripheral surface of the tire 11, the shaft 12c moves eccentrically against the elastic force of the leaf spring 12d as shown in FIG. The contact plate 12b is pressed against the wall of the tire 11 and floats in the vertical direction to follow. As a result, the tire 11 gripped by the tire gripping arm 10 is accurately centered.

[0012]

[Effect of the device]

 As described above, according to the present invention, a tire gripping arm having a plurality of tire gripping arms arranged at equal intervals on the main body plate and expanding and contracting in the radial direction and a surface perpendicular to the tire gripping surface of the tire gripping arm is provided. In a tire automatic tightening device equipped with a pad that is integrally provided with the tire to contact the wall surface of the tire and a nut runner for tightening the hub nut, the pad is connected to the tire wall contact plate and the tire wall contact plate. Since the plate is composed of an outer cylinder that is always centripetally urged in a vertical plane by a leaf spring, etc., and that is supported by a bullet so that it can float, the pad that is pressed against the wall surface of the tire is in a vertical plane. Since it floats and follows in any direction, there is no slippage, and the tire gripping arm is used to center the tire. It can be performed grayed with high accuracy.

[Brief description of drawings]

FIG. 1 is a side view of the overall configuration of the device of the present invention.

FIG. 2 is a sectional view of the pad.

FIG. 3 is a front view of a normal position of the pad.

FIG. 4 is a front view of the pad in a floating state.

FIG. 5 is a side view of a main part of a conventional device.

FIG. 6 is a side view of a main part showing a defect of the conventional device.

[Explanation of symbols]

 8 body plate 10 tire gripping arm 11 tire 12 pad 12a outer cylinder 12b tire wall contact plate 12c shaft 12d leaf spring 13 nutrunner

Claims (1)

[Scope of utility model registration request] 1. A plurality of tire gripping arms arranged at equal intervals on a main body plate and expanding and contracting in a radial direction, and a tire gripping arm having a surface perpendicular to a tire gripping surface of the tire gripping arm and integrally formed with the tire gripping arm. In a tire automatic tightening device provided with a pad provided to abut a wall surface of a tire and a nut runner for tightening a hub nut, the pad is a tire wall abutting plate, and the tire wall abutting plate is a leaf spring or the like. The tire automatic tightening device is characterized by being constituted by an outer cylinder that is always centrically biased in a vertical plane and that is supported by a bullet so that it can float.