JPH03239432A - Nut runner - Google Patents

Abstract

PURPOSE:To automate the fastening of a nut and the inserting work of a locking pin by providing a sensor which performs the phase detection of a groove and through hole on the nut runner which performs the alignment of the groove of a grooved nut and the through hole of the drive shaft of an automobile. CONSTITUTION:This nut runner 1 arranges an outer cylinder 13 freely rotatably on the outer periphery of the inner cylinder 7 having a socket 9 engaged with grooved nut A and is installed with projector 24 and light receiver 25 which become sensors for performing the positional detections of the groove of the nut A and the through hole of a drive shaft C, on the lower outer cylinder 17. At the fastening time of the nut A, the fastening work is performed by rotating the inner cylinder 7 only. Thereafter, the inner cylinder 7 and outer cylinder 13 are integrated only at the time when the alignment of the nut A groove and the through hole of the shaft C while fastening the nut A and the detection as to whether or not the groove and through hole are conformed is performed by the projector 24 and light receiver 25. Then, the rotations of the inner cylinder 7 and outer cylinder 13 are stopped in case of the both being conformed and the alignment of the groove and through hole is automatically performed.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a nut runner, and more specifically, when a grooved nut is screwed onto a shaft and tightened, the groove of the grooved nut and the fil! This invention relates to a nut runner that can be automatically aligned with holes.

[Conventional technology]

In the process of assembling an automobile drive shaft, after inserting the nut and hub into the drive shaft, a nut is screwed onto the threaded part at the end of the drive shaft, and by tightening this nut, the drive shaft and hub are integrated. It seems like it's going to change. Further, as shown in FIGS. 6 and 7, a grooved nut (A) with # (B) provided at six equally spaced positions on the circumference is used as the above-mentioned nut. ) The threaded part (D) at the tip has a through hole (E
) are perforated in a cross shape. Then, attach the grooved nut (A
) to the drive shaft (C), tighten the grooved nut (A) at 14 (B) and the through hole (C) of the shaft (C).
By aligning the grooves E) and inserting a stopper pin (F) between them, the grooved 7) (A) is prevented from loosening. In addition, in FIG. 6 and FIG. 7, (G) is the hub,
(H) is a washer.

[Problem to be solved by the invention]

In the assembly process of the drive shaft (C) mentioned above,
After tightening the grooved nut (A) to the threaded part (D) at the tip of the drive shaft (C), connect # (B) of the grooved nut (A) and the through hole (E) of the drive shaft (C). The alignment is performed as follows: Naphthra z'-,
After tightening the grooved nuff (A) to the specified torque, the worker takes a wrench and manually tightens the grooved nut (A).
further tighten, and at this time, the operator visually inspects the grooved nut) (
# of A) (B) and the through hole of the drive shaft (C) (
Since the rotation stopper (F) is inserted between the two in this state, there is a problem in that the above-mentioned work takes a long time.

(Means for solving IS problem) The naph runner has an inner cylinder supported so as to be rotatable in forward and reverse directions, a socket fixed to the tip of the inner cylinder to hold the nut, and a rotatable structure attached to the outer periphery of the inner cylinder. an outer cylinder which is arranged so that a rotational force is always applied in the opposite direction to the naphft tightening direction by the action of a coiled spring, and an index groove that is slidably supported by the outer cylinder and formed on the outer circumference of the cylinder. an index notch for integrating the inner cylinder and the outer cylinder by fitting with the
After the inner cylinder and the outer cylinder are integrated, a sensor placed at the tip of the outer cylinder is used to detect the phase of the nut, which is engaged with the inner cylinder through the socket, relative to other desired members. It is composed of

(Function) As described above, an outer cylinder is rotatably disposed on the outer periphery of an inner cylinder having a socket that fits into a grooved napft, and this outer cylinder is provided with Install the emitter and receiver that serve as sensors for detection, and only when necessary, align the groove of the grooved nut with the through hole of the drive shaft by rotating the inner cylinder and outer cylinder together. This is what we do.

〔Example〕

Figures 1 to 4 show a naph runner (1) according to the present invention.
This shows that. In the same figure, (2) is a support bracket raft of a lifting device for vertically movably supporting the naph runner (1) at a predetermined working position, and (3) is a nut launch fixed to the support bracket (2). (1) is an actuator serving as a power source; (4) is a support plate suspended below the support bracket (2); and (5) is a support tube fixed to the support plate (4). (6) is a main shaft that passes through the support tube (5) and extends downward, and this main shaft (6) is directly connected to the output shaft (3a) of the actuator (3), and the actuator (3) It is designed to rotate forward and reverse. (7) is an inner cylinder spline-fitted to the outer periphery of the main shaft (6), and (8) is a stepped portion (6a) on the outer periphery of the main shaft (7).
) and the rear end surface of the inner cylinder (7).
) to constantly press downward, (9) is
This is a socket for holding a grooved nut (A) attached to the tip of the inner cylinder (7). This socket (9) has a 6.
six slits (9a) facing six jlls (B)
is provided, and when the grooved nut (A) is fitted into the socket (9), the valley groove (B) of the grooved napft (A) and each slit (9a) of the socket (9) match. That's how it is. (10) has a spring (1) inside the main shaft (6)
The center bin (10) is inserted so as to be slidable in the axial direction through the socket (9). be. (12) is a connecting cylinder that is fitted and fixed on the outer circumference of the upper end of an inner cylinder (7) having a socket (9), and index notches (19), which will be described later, are provided at equal positions on the outer circumference of this connecting cylinder (12). ) There are 6 notches # (12a) that engage with each other. (13) consists of an upper outer cylinder (15) rotatably arranged on the outer periphery of the support cylinder (5) via a bearing (14), and an upper outer cylinder (15) rotatably arranged on the outer periphery of the inner ffi (7) via a bearing (16). Lower outer cylinder (17
). A spring (18) is incorporated between the upper outer cylinder (15) and the support plate (4) integrated with the support cylinder (5), and the upper outer cylinder (15) includes: Rotational force is always applied in the opposite direction to the nut tightening direction. In addition, an index notch accommodating portion (17a) is provided in a protruding manner in a portion of the lower outer 1vj (17) facing the connecting tube (I2), and the tip thereof is inserted into the notch of the connecting tube (12). An index notch (19) engaging the groove (12a) is slidably inserted. And this index notch (1
9) to the inner side of the outer cylinder using the cylinder (20) fixed to the outer end of the index notch storage part (17a), and insert the tip of the index notch (19) into the notch J (12a).
By engaging with the lower outer periphery (17) and the inner fli
(7) are integrated. In addition, a balance weight (21) is attached to the lower outer cylinder (17) at a position facing the index notch storage part (17a).
This is to remove the looseness when the lower outer cylinder (17) rotates. (22) is the upper outer cylinder (15) and the lower outer cylinder (17)
The upper part of this connector (22) is bolted to the outer periphery of the upper outer cylinder (15), and the bifurcated lower part (22a) is connected to the outer periphery of the lower outer cylinder (17). By positioning it on the outer periphery of the index notch storage part (17a),
The upper outer cylinder (15) and the lower outer cylinder (17) are integrated so that the lower outer cylinder (17) is also always applied with rotational force by the first spring (18), and the connecting body A stopper (23) is installed on the side of (22), and under normal conditions, the upper outer cylinder (15) and lower outer cylinder (17) are connected by the connecting body <22). )7 par (23)
It is stationary at the position where it touches. (24) and (
25) is a socket (
9) A light emitter and a light receiver serving as sensors are arranged equally on the outer periphery of the light emitter (24) and light receiver a.
(25) are arranged to face each other with the socket (9) in between.

Then, the index notch (19) connects to the connecting tube (12).
an inner i'i (7) that engages with a notch groove (12a) and has sockets 7) (9), and an upper and lower outer cylinder (15) (17
) are integrated, each of the above-mentioned emitter/receiver (24) (2
5) are the slits (
7a).

In addition, each lead wire of the emitter <24> and receiver (25) (
24a) (25a) are led out to the outside from the slit (17b) provided in the lower outer cylinder (17>), and are connected to external equipment (not shown) while leaving a slight margin for each lead wire (24a) (25a). ).

In the above configuration, the drive shaft (C) in which predetermined members are incorporated is carried in and positioned directly below the naph runner (1), and is placed on the hub (G) of the drive shaft (C) as shown in FIG. , a locking ring (B) having a protrusion (A) that engages with the hub bolt (I) protruding from the knob (G) is set, and a grooved naphof is inserted into the socket (9) of the naph runner (1). When I-(A) is supplied,
First, the actuator (3) drives a cylinder (6) having a main shaft (6), a center bin (10) and a socket (9).
7) Rotate in the tightening direction. Furthermore, in this state,
The index notch (19) stored in the lower outer cylinder (17) is
The upper and lower outer cylinders (15) and (17) do not rotate because they do not fit into the notch groove (12a) of the connecting cylinder (12).
When the support bracket (2) is lowered to lower the naph runner (1) in this state, the tip of the center bin (10) comes into contact with the tip of the drive shaft (C), and the drive shaft of the main shaft (6) Centering for <C> is performed. Next, while compressing the spring (1), the members other than the center bin (lO) continue to descend, thereby moving the grooved napft (A) held in the socket (9) to the tip of the drive shaft (C). Threaded part (D)
and screw the grooved napht (A) onto the drive shaft (C
) (as shown in Figure 4!@) After this tightening, the drive shaft (C) is attached to the hub bolt (1) that protrudes from the hub (G) that is spline-fitted to the drive shaft (C).
) is prevented from idling by coming into contact with the protrusion (A) of the stop ring (B), and the grooved nut (A) is tightened to the center of the drive shaft (C) (D). The attached napft (A) is attached to the center (D) of the drive shaft (C).
), and when the tightening torque by the nut runner (1) reaches a preset value, the actuator (3) stops driving and the rotation of the socket (9) stops once. In this way, 7 grooves (A
) to the drive shaft (C) is completed,
Next, by extending the cylinder (20), the index notch (19) is slid inward, and at the same time, the tip of the index notch (19>)
The inner cylinder (7) is reversed by the actuator (3) until it fits into one of the six notch grooves (12a) provided in the index notch (19), and the tip of the index notch (19) is inserted into the notch groove (1).
2a), the upper and lower outer cylinders (15)
(17) and the inner cylinder (7) are integrated.

By reversing the inner cylinder (7), the socket (19)
Even if the nut (A) is reversed, the drive shaft (C) will still be stuck to the hub pole (1) that protrudes from the hub (G). ) until it comes into contact with the surface opposite the surface that was in contact with the hub bolt when tightening the nut (usually 60° to 80°)
Since the grooved type can be reversed together with the nut (A), the index/7ch (19) can rotate the cylinder interior (7) with the notch # (12a
) (A) will not come loose by rotating it in the opposite direction until it engages with the grooved nut (A).

When the upper and lower outer cylinders (15) (17) and the inner cylinder (7) are integrated as described above, the three pairs of projectors (24) and Receiver (2
5) are located at positions facing the slits (9a) of the socket (9), which are aligned with the grooves (B) of the grooved nut (A), respectively. Therefore, in this state, the actuator (3) again rotates the inner cylinder (7>) in the normal direction, and the upper and lower outer cylinders (1) resist the elastic force of the coil spring (18).
5) (17) is also rotated in the normal direction, and the grooved nut (A) is further rotated in the direction for tightening with respect to the drive shaft (C).
If one of the pair of grooves (B) matches one of the two through holes (E) provided in a cross shape on the drive shaft (C), the projector facing this It (B) (24)
The light beam irradiated from the through hole (E) enters the opposing light receiver (25), and the -II of the grooved nuff (A)
It can be detected that (B) and the through hole (E) of the drive shaft (C) match. Therefore, if the drive of the actuator (3) is automatically stopped at this point and the rotation of the inner cylinder (7) is stopped, the phase of the grooved nut (A) with respect to the drive shaft (C) can be accurately aligned. The tightening work of the grooved number l-(A) can be completed with this step. Uk raises the entire naph runner (1) by raising the support frame (2), separates the socket (9〉) from the grooved nut (A) which has been tightened, and then removes the cylinder (20). By shortening the index notch (19) and separating the tip of the index notch (19) from the notch groove (12a) of the connecting cylinder (12) and separating the inner bay (7) and the upper and lower outer cylinders (15) and (17), the coil spring (18) Due to the elastic force, the upper and lower outer cylinders (15)
(17) rotates in the opposite direction until the connecting body (22) comes into contact with the stopper (23), and the nut trunk (1) returns to its original state, completing one tightening process. Also, upper and lower outer ff
When j (15) and (17) return to their original states, the lead wires (24a) of the light emitter and receiver (24) and (25) are led out from the slit (17b) of the inner cylinder (17).
(25a) is prevented from being twisted due to the above-mentioned rotational movement of the upper and lower outer cylinders (15) and (17).

In the above embodiment, the napht runner (1) according to the present invention is used, and the grooved napht (A) is tightened to the center part (D) of the tip of the drive shaft (C) after tightening.
'1ti! ! Hole (E) and grooved nut (A)
Although an example has been described in which the grooves (B) provided in It can also be used for nut tightening locations other than those mentioned above, where it is necessary to match the phase with a predetermined member.

〔Effect of the invention〕

As described above, the nut runner according to the present invention has an outer cylinder rotatably disposed on the outer periphery of an inner cylinder having a socket that fits into a grooved nut, and a groove of the grooved nut and a drive shaft that pass through the outer cylinder. A light emitter and a light receiver are installed as sensors to detect the position with the hole, and when tightening the grooved nut, only the inner cylinder with the socket is rotated. Only when aligning the groove of the grooved nut with the through hole of the drive shaft while tightening the grooved nut, the inner cylinder and outer cylinder are integrated, and the emitter and receiver placed on the outer cylinder are used to tighten the groove. By detecting whether or not the and through hole match, and stopping the rotation of the inner and outer cylinders when they match, the grooved nut can be tightened to the drive shaft and the grooved nut can be tightened to the drive shaft. The groove and the through hole of the drive shaft can be automatically aligned. Further, if the inner tube and the outer tube are separated after the grooves and the through holes are aligned, the outer tube returns to its original state due to the elastic force of the coiled spring. Therefore, when a grooved napft is tightened using the nut runner according to the present invention, the tightening of the grooved nut and the alignment of the groove of the grooved napft and the through hole of the drive shaft are all automatically performed. This greatly improves the work efficiency of grooved napht tightening work. In addition, the outer cylinder with the emitter and receiver is
After the grooved nut is tightened to the drive shaft, it rotates with the inner cylinder only when the groove and through hole are aligned, and after further alignment, it returns to its original state due to the elastic force of the coiled spring. The lead wires led out from the emitter and receiver will not be twisted by the rotational movement when tightening the grooved nut, and it is only necessary to leave a small amount of slack in the lead wires led out from the emitter and receiver. Therefore, processing of the lead wire becomes easy and at the same time, the lead wire does not break.

[Brief explanation of drawings]

FIG. 1 is a sectional view of essential parts of a naph runner according to the present invention, FIG. 2 is a bottom view showing the tip of the nut runner, FIG. 3 is a sectional view taken along line nn in FIG. 6, and FIG. FIG. 5 is a cross-sectional view showing the state of the tip of the nut runner when it is in operation. FIG. 5 is a plan view showing the engagement relationship between the rotation stop ring and the hub bolt of the hub inserted into the drive shaft. FIG. Fig. 7 is a plan view showing the fitted state with the attached parts.
FIG. 6 is a sectional view taken along line nn. (1) - naph runner, (7>... - inner cylinder, (9)
-Socket, (9a) -Slit, (12)
One connecting cylinder, (12a) - Latch groove, (13
) (17) (24) (A) (C) (E) One outer cylinder, one lower outer cylinder, one projector, - Grooved nut, - Drive shaft - Through hole. (15) -11 upper outer cylinder, (19) -11 index notch, (25) -light receiver, (Bi-1 groove, foot, 2nd rM

Claims (1)

[Claims] (1) An inner cylinder supported so as to be rotatable in forward and reverse directions, a socket fixed to the tip of the inner cylinder to hold the nut, and a socket rotatably arranged around the outer periphery of the inner cylinder, and supported by the action of a coiled spring. , an outer cylinder to which a rotational force is always applied in the opposite direction to the nut tightening direction, and an inner cylinder that is slidably supported by the outer cylinder and fitted into an index groove formed on the outer periphery of the inner cylinder. an index notch for integrating the inner cylinder and the outer cylinder, and a phase adjustment of the nut engaged with the inner cylinder via the socket with respect to other desired members after the inner cylinder and the outer cylinder are integrated. A nut runner characterized in that it is equipped with a sensor placed at the tip of an outer cylinder for detecting.