JPS6346208Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a clutch mechanism in a nut runner device.

(Prior Art) Conventionally, for example, in the multi-shaft nut runner device shown in FIG.
is provided with a driver 19 at its tip (lower end in the figure) that engages with the engagement head 10 of a tightening shaft 12 made of a threaded member screwed onto the pallet 8, and the nut runner shaft 18 is disposed above the pallet 8. The frame 3 is positioned opposite the mounting surface of the pallet 8.
A cylindrical head 31 is fixed coaxially with the tightening shaft 12.
It is configured to be driven by a hydraulic motor 33 mounted on the frame 3, which is rotatably supported and pivoted so as to move forward and backward in the axial direction. The pallet 8 is placed on a lift table 5 which is supported by a pilot bar 4 on one side of a column 2 erected on a base 1 and is raised and lowered by a lift cylinder device 6. Further, a clamper 9 is attached to the upper end of the tightening shaft 12 for clamping a workpiece W attached to a reference block 23 on the pallet 8. In such a configuration, the operation of each hydraulic motor 33 that drives each nut runner shaft 18 is controlled by the switching operation of one electromagnetic switching valve 50, and the switching operation of the electromagnetic switching valve 50 finally causes the hydraulic motor 33 that drives each nut runner shaft 18 to move up while rotating. Alternatively, the lowering nut runner shaft 18 selectively operates a pair of limit switches LS1 for checking tightening and limit switches LS2 for checking loosening. Therefore, the nut runner shaft 18 that has completed tightening of the tightening shaft 12 early is stopped from rotating due to the balance between the tightening reaction force and the tightening force of the hydraulic motor 33, and conversely, the nut runner shaft 18 is loosened. The nut runner shaft 18, which has completed the process, is prevented from retracting by a one-way clutch mechanism 30 assembled to the nut runner shaft 18, as shown in FIG.

In this case, the conventional one-way clutch mechanism 30 is
The first engaging member 3 is elastically supported to be rotatable and movable in the axial direction integrally with the nut runner shaft 18.
8 and a second engaging portion 37 formed at the lower end of the cylindrical head 31, as shown in FIG.
The engagement pawl 38a formed on the engagement member 38 engages the second engagement portion 3 as the nut runner shaft 18 retreats (raises).
7, the rotation of the nut runner shaft 18 is forcibly stopped. By the way, when the clutch is engaged, both engagement claws 38
When the amount of engagement between the engagement claws 38a and 37a is small, the full output of the hydraulic motor 33 is applied to the engagement claws 38a and 37a with little engagement.
37a, so the engaging claws 38a, 3
There was a concern that 7a might be missing and this would interfere with clutch engagement.

(Problem to be solved by the invention) The invention aims to solve the above-mentioned problem, and its main purpose is to accurately adjust the engagement amount of both engaging pawls as the nut runner shaft retreats when the clutch is engaged. It is an object of the present invention to provide a clutch mechanism that can increase the load locally applied to both engaging pawls.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a nut runner shaft which is provided with a driver at its tip that engages with the engagement head of a screw member screwed onto a mounting body such as a pallet. The nut runner shaft is rotatably supported by a cylindrical head coaxially fixed to the screw member on a frame located opposite to the mounting surface of the body, and the nut runner shaft is assembled to the frame. In the nut runner device, the nut runner device is driven by a pressure motor, and includes a first engaging member elastically supported to be rotatable integrally with the nut runner shaft and movable in the axial direction, and a screw member attached to the cylindrical head. The second part is screwed with a reverse thread relative to the threaded part.
an engaging member, one end of which is engaged with the cylindrical head and the other end of which is engaged with the second engagement member;
a torsion spring that urges the engaging member to return to its original angular position; and a torsion spring having a proximal end fixed to the cylindrical head and a distal end protruding into a circumferential notch provided in the second engaging member. A stopper pin is provided, and when the fluid pressure motor is rotated so that the screw member is screwed back by engagement with the driver of the nut runner shaft, a serrated engagement pawl formed on the first engagement member After engaging the serrated engagement pawl formed on the second engagement member, rotation of the second engagement member is regulated by engagement with the stopper pin, so that rotation of the nut runner shaft is regulated. This invention has devised a clutch mechanism for a nut runner device characterized by the following features.

(Operations and Effects of the Device) According to such a device, when the engaging claw of the first engaging member engages with the engaging claw of the second engaging member, when both engaging claws engage, As the impact is alleviated by the torsion spring, the second engaging member spirally advances in the opposite direction to the retraction of the nut runner shaft, so that the amount of engagement between the two engaging claws increases and is applied locally to both the engaging claws. By eliminating the load, it is possible to prevent both engaging claws from being damaged.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 4 to 6. The nut runner shaft 18 shown in FIG. A driver 19 is provided at the tip (lower end in the figure) of the tightening shaft 12, which engages with the engagement head 10 of the tightening shaft 12 made of a threaded member attached to the nut runner shaft 1.
8 is disposed above the pallet 8, and the pallet 8
The cylindrical head 3 is rotatably supported by a cylindrical head 31 fixed coaxially with the tightening shaft 12 to the frame 3, which is positioned opposite to the mounting surface of the cylindrical head 3.
It is configured to be driven by a hydraulic motor 33 assembled to 1. In this configuration, the one-way clutch mechanism 40 of this embodiment is spline-coupled to the nut runner shaft 18 so as to be movable in the axial direction, and is elastically supported by a coil spring 42, as shown in an enlarged view in FIG. A first engaging member 41 made of a repellently supported cylinder, and a cylindrical head 31
a second engaging member 43 consisting of a cylinder screwed onto the lower end of the screw with a reverse thread relative to the threaded portion of the tightening shaft 12;
A torsion spring 44 that fits around the outer periphery of the lower end of the cylindrical head 31, has one end locked to the flange portion of the second engaging member 43, and the other end locked to a part of the cylindrical head 31; As shown in the figure, a stopper pin 46 is provided with its tip protruding from a circumferential notch 45 provided in the cylindrical portion of the second engaging member 43 and its base end fixed to the cylindrical head 31. In this configuration, the torsion spring 44 serves to bias the second engaging member 43 to return to the original angular position shown when the second engaging member 43 is spirally advanced,
The first engaging member 41 is fitted into the second engaging member 43 so as to be relatively movable. In addition, the first engagement member 41
Serrated engagement claws 41a and 43a that engage with each other are formed on each flange portion of the second engagement member 43 and the second engagement member 43, respectively.

One-way clutch mechanism 40 configured as described above
When the nut runner shaft 18 loosens the tightening shaft 12 and retreats upward as a result of the reverse rotation of the hydraulic motor 33, the first engaging member 41 supported by the coil spring 42 on the nut runner shaft 18 rotates. The engaging claw 41 a of the second engaging member 43 engages with the engaging claw 43 a of the second engaging member 43 . This results in
The second engaging member 43 rotates in the same direction as the nut runner shaft 18 and is threaded by a reverse screw action. Therefore, after the amount of engagement between the engaging pawls 41a and 43a that are engaged with each other increases, the rotation of the second engaging member 43 is regulated by the engagement between one end of the notch 45 and the stopper 46, and the retreat of the nut runner shaft 18 is regulated. Ru. Note that when the nut runner shaft 18 is lowered by normal rotation of the hydraulic motor 33, the second engaging member 43 is screwed back by the action of the torsion spring 44 and returns to its original angular position.

(Effects of Example) As understood from the above description, in this example, the engaging claw 41a of the first engaging member 41
When the engagement claw 43a of the second engagement member 43 is engaged with the engagement claw 43a of the second engagement member 43, the impact generated when the engagement claws 41a and 43a are engaged is absorbed by the torsion spring 44, and the second
Since the engaging member 43 screws forward in the opposite direction to the retraction of the nut runner shaft, the amount of engagement between both the engaging claws 41a and 43a increases, eliminating the load locally applied to both the engaging claws, and causing the engaging claws 41a and 43a to move forward. 43a can be prevented from being lost.

[Brief explanation of the drawing]

Fig. 1 is a front view of a conventional nut runner device, Fig. 2 is an enlarged sectional view taken along the - line in Fig. 1, and Fig. 3 is an explanatory diagram showing the engaged state of the engaging pawl in the clutch mechanism shown in Fig. 2. , FIG. 4 is a cross-sectional view of a nut runner device equipped with a clutch mechanism according to the present invention, FIG. 5 is a partially enlarged cross-sectional view of FIG. 4, and FIG. 6 is a cross-sectional view taken along the line -- in FIG. Explanation of symbols, 3...Frame, 8...Pallet, 9...Clamper, 10...Engagement head, 12
... Tightening shaft (threaded member), 18 ... Natsutratuna shaft, 19 ... Driver, 31 ... Cylindrical head, 3
3... Hydraulic motor, 40... Clutch mechanism, 41
...first engagement member, 42...coil spring,
43... Second engaging member, 41a, 43a... Engaging claw, 44... Torsion spring, 45... Notch, 4
6...Stotsupapin.

Claims (1)

[Claims for Utility Model Registration] A frame in which a nut runner shaft is located opposite the mounting surface of the mounting body, the nut runner shaft having a driver at its tip that engages with the engagement head of a screw member screwed onto a mounting body such as a pallet. In a nut runner device, the nut runner shaft is rotatably supported on a cylindrical head fixed to the frame and can be moved back and forth in the axial direction, and the nut runner shaft is driven by a motor attached to the frame, which is rotatable integrally with the nut runner shaft. a first engaging member elastically supported to be movable in the axial direction; a second engaging member screwed onto the cylindrical head with a reverse thread relative to the threaded portion of the threaded member; a torsion spring that locks the cylindrical head to the cylindrical head and locks the other end to the second engaging member to urge the second engaging member to return to its original angular position; A stopper pin is fixed to the cylindrical head and has a tip thereof projected into a circumferential notch provided in the second engaging member, and the screw member is screwed back by engagement with the driver of the nut runner shaft. When the motor is rotated, the serrated engagement claw formed on the first engagement member engages the serrated engagement claw formed on the second engagement member, and then the second engagement 1. A clutch mechanism for a nut runner device, wherein rotation of the mating member is restricted by engagement with the stopper pin, thereby restricting rotation of the nut runner shaft.