JPH0529819Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a double-nut adjustment and tightening device for tightening and fixing an adjustment nut by holding a predetermined gap in the axial direction by a fixing nut.

(Prior art) For example, when assembling a stem pipe to the head pipe of a motorcycle, a top cone race c is screwed onto the stem pipe a as shown in Fig. 3.
The top cone race C is assembled so that it rotates smoothly without any play in the axial direction due to the
is tightened and fixed using a lock nut d in a double-nut style.

However, in order to form a predetermined gap between the top cone race c and the head pipe b,
When the lock nut is tightened while the is positioned and held in the axial direction, the top cone race c moves in the axial direction by the amount of backlash between the thread grooves of the stem pipe a and the top cone race c. In such a situation, a problem arises in that a predetermined gap cannot be maintained. Therefore, when assembling this type of assembly, it is necessary to perform work that requires experience for gear adjustment, such as returning the top cone race c in advance by the amount of movement caused by tightening the lock nut d. Another problem is that the amount of adjustment varies depending on the operator, resulting in variations in the product.

The device disclosed in Japanese Patent Application Laid-open No. 141477/1986 is
An adjusting nut corresponding to a top cone race and a fixing nut corresponding to a locking nut are held by two concentrically arranged sockets, and the adjusting nut is first tightened to the specified torque, and then loosened by the amount corresponding to the backlash. The above description relates to a tightening device for tightening fixing nuts, but although this type of device can be applied to tightening small nuts to maintain a proper gap and fix levers, etc., it is difficult to assemble motorcycles. Not only is it inapplicable to work performed on a conveyor belt, such as in It also has other problems.

(Problem to be solved by the invention) The present invention was created in view of the above problem, and its purpose is to attach a jig to a stem pipe at a motorcycle assembly site. To provide a new portable device that can accurately loosen a top cone lace by a certain amount.

(Means for solving the problem) That is, the present invention is a device for loosening the top cone race of a stem pipe for a motorcycle to achieve the above problem. A rotatable gear with a rectangular recess that engages with the nut of the top cone race, a rotary actuator that transmits rotational driving force to this gear via a main drive gear, and a rotary actuator located opposite to the lower surface of this gear. A detecting member is installed to detect the amount of return from a dog provided on the lower surface, while a gripping member that can be opened and closed to clamp the stem pipe and fix the jig body there is installed on the other side of the jig body. It is designed to protrude parallel to the surface.

(Example) Therefore, the example illustrated below will be described.

Fig. 1 shows an embodiment of the present invention configured for tightening a top cone race screwed onto a stem pipe of a motorcycle, and shows an adjustment and tightening jig designated by reference numeral 1 in the figure. The frame 2 of the adjusting and tightening jig 1 acts on the top cone race c, which has been tightened with a certain torque in advance, to loosen it in the direction of separating it from the head pipe b by the required gap. , a ring-shaped driven gear 4 having a hexagonal recess 3 on the lower inner surface that engages with the nut portion of the top cone race c, and a main drive gear 6 fixed to the shaft 8 of the rotary actuator 7 mesh with each other. The clamper 10 is fixed to the lower part of the frame 2 via the rotary actuator 7, and has two gripping claws 11, 11 that protrude horizontally and can be opened and closed to hold the head pipe b. is configured to be held and fixed from both sides.

In addition, the reference numeral 12 in the figure indicates a gripping rod fixed to the frame 2, and 13 detects the return amount of the driven gear 4 by sensing the dog 5 provided on the lower surface of the driven gear 4, and the detection output is Thus, a proximity switch is shown which is configured to operate the clamper 10 in a disengaging manner.

In the embodiment configured in this way, for the stem pipe a that has now been inserted into the head pipe b,
Tighten the top cone race c from above until it reaches the upper end of the head pipe b, and then tighten the lock nut d from above with a torque wrench (not shown) to a constant torque. As a result, the top cone race c is displaced downward in the figure and comes into strong contact with the head pipe b. Next, the ring-shaped driven gear 4 is fitted from the upper end of the stem pipe a, and the hexagonal recess 3 provided at the lower end of the inner circumference is fitted into the top cone race c, and then the clamper 10 is operated to clamp the two pieces. The adjusting and tightening jig 1 is fixed to the head pipe b by holding the head pipe b between the claws 11, 11. Then, in this state, the rotary actuator 7 is operated, and its rotation is transmitted to the driven gear 4 via the main drive gear 6 fixed to the shaft 8 of the actuator 7, and the top cone race c engaged with this is reversed. When you do this, frame 2
The proximity switch 13 fixed to detects the dog 5 protruding from the lower surface of the driven gear 4, and stops the rotary actuator 7 based on the detection signal.
A predetermined clearance is created between the top cone race c and the head pipe b.

Then, use an impact wrench (not shown) to tighten the lock nut d to the top cone race c to lock it so that it does not move.

Finally, the clamper 10 is operated in reverse to remove the adjustment jig 1 from the head pipe.

Note that the driven gear drive mechanism used in this device may be replaced with another rack-type drive mechanism.

(Effects) As described above, according to the present invention, a gear is provided on one side of the jig body equipped with a gripping rod to engage with the top cone race to reverse the rotation, and on the other side,
Since a gripping member is provided to hold the stem pipe of a motorcycle and fix the jig body, the jig body can be easily fixed to the workpiece on the conveyor, and the desired top cone can be fixed. The lace loosening operation can be easily performed.

Moreover, a detection member for detecting the dog on the underside of the jig body is provided at a position facing the gear, so if the top cone race is reversed with the jig body fixed by the gripping member, the dog can be detected. The amount of rotation of the gear, that is, the amount of return of the top cone race, can be easily detected from the detection signal.
The amount of loosening can be controlled accurately.

[Brief explanation of the drawing]

Fig. 1 is a side view of a device showing an embodiment of the present invention, Fig. 2 is a plan view of the clamp mechanism, and Fig. 3 is a diagram showing a top cone race of a motorcycle that is tightened and adjusted by the device of the present invention. be. 1... Adjustment tightening jig, 4... Driven gear, 6...
Main drive gear, 7...Rotary actuator, 1
0... Clamper, 13... Proximity switch, a...
Stem pipe, b...head pipe, c...top cone lace, d...lock nut.

Claims (1)

[Scope of utility model registration request] A rotatable gear with a rectangular recess on the inner periphery that engages with the nut of the top cone race is provided on one side of the jig body equipped with a gripping rod, and a rotary gear that transmits rotational driving force to the gear via a main gear. An actuator and a detection member that is located opposite to the lower surface of the gear and detects its return amount from a dog provided on the lower surface of the gear are provided, and a stem pipe is held between the other of the jig main bodies. A device for loosening a top cone race of a stem pipe for a motorcycle, characterized in that an openable/closable grip member for fixing the jig main body to the stem pipe is provided protruding parallel to the surface of the gear.