JPH01257531A - Castel lated nut fastening split cotter pin positioning detecting socket - Google Patents

Abstract

PURPOSE:To prevent increase of size and to prevent the occurrence of poor contact to a slide part by a method wherein a power source mounted on the case side and an emission element are electrically interconnected through bearings, and a signal output part disposed on the case side and a collection element are electrically interconnected through the bearings. CONSTITUTION:A power from a power source 13 is fed to an emission element 81 through bearings 21 and 23 and the emission element 81 emits light. Meanwhile, light emitted from the emission element 81 through coincidence of the split cotter pin groove of a castellated nut with the through-hole of a bolt is inputted to a collecting element 82 to photoelectrically convert it, and an electrical signal therefrom is fed to a signal output part 12 on the case 10 side through the bearings 21 and 23. This constitution eliminates the need to mount a new slide part for tie-in of an electrical signal between the rotation side and the fixed side, and prevents complication of a device and increase the size of the device, and in turn reduces limitation on a space. Besides, the bearings 21 and 23 are used for tie-in of the electric signal between the rotation side and the fixed side, resulting in suppression of wear.

Description

Detailed Description of the Invention (Industrial Application Yf) The present invention provides a castle nut having a groove formed along the radial direction of the end face for inserting a split pin into the end face, and a castle nut having a through hole in the threaded part. Canal nut tightening, which is applied, for example, to tighten bolts formed with cotter pins, relates to cotter pin alignment detection sockets.

(Prior Art) Pol-nuts are widely used for fastening mechanical parts. The bolt and nut are engaged by a predetermined amount of force at the corner threads. Therefore, the reaction force due to tightening is the force that rotates the bolt and nut in the direction of loosening. ), while a frictional force is generated on the threaded surface due to tightening, and this frictional force counteracts the force in the loosening direction, thereby preventing the nut or bolt from loosening. In addition, loosening is generally prevented by using flat washers, ring washers, etc. to maintain the frictional force on the screw seating surface. In addition, when fastening parts with bolts and nuts, there are inevitably limits to the permissible surface pressure and tensile stress that acts in the axial direction, so it is required that they be tightened to a specified torque. be done.

For example, in the case of a front axle assembly in an automobile's suspension, the nut is tightened using an impact wrench and then tightened to a specified torque using a torque wrench, since the nut plays an important function during driving. There is. In addition to this, in order to reliably prevent the nut from loosening or even coming off due to shocks and vibrations that occur when the vehicle is running, the suspension lower arm and upper arm are especially connected to the knuckle. For the mounting part of the ball joint, as shown in FIG. 9, a castle nut 1 is used as the nut, and the split pin 2 is inserted through the split pin groove 3 of the castle nut 1 and the bolt 4 in a cross shape or a straight shape. The nut is inserted into the hole 5 to prevent the nut from loosening.

However, this method has the problem that when tightening with an impact wrench, the tightening torque must be set to about the lower limit of the specified torque based on the operator's intuition and tricks, which requires skill. Furthermore, if the tightening torque with an impact wrench exceeds the specified torque, the torque wrench cannot return the tightening torque to the specified value, so there is a possibility that the tightening torque will be tightened with more torque than necessary. Ta. Further, since retightening with a torque wrench requires heavy physical labor, there is a problem in that the burden and fatigue on the worker is high.

As an example of a solution to the above-mentioned problem, the castle nut tightening device shown in FIGS. 10 and 11 of Japanese Patent Application No. 10833/1983, devised by the inventors of the present invention, can be considered.

This castle nut tightening device involves fitting a castle nut, which has a groove formed on the end face along the radial direction into which the split pin is inserted, into the four parts formed at the tip of the socket to be rotated, and also inserting a through hole into the four parts formed at the tip of the socket. The castle nut is rotated and tightened by a socket onto a bolt formed on a threaded portion along the direction,
A light emitting means that emits light from the outside in the radial direction toward the axis of the socket at a position corresponding to the groove of the castle nut fitted in the four parts, and a light emitting means that is sensitive to the light emitted from the light emitting means and and three pairs of light receiving means for detecting coincidence or mismatch in the axial and circumferential directions between the groove and the through hole based on light, and these three pairs of light emitting means and light receiving means are attached to the socket. .

To tighten the castle nut, first fit the castle nut into the recess at the tip of the socket.
Next, while emitting light from the light emitting means, the socket is rotated at a high speed (maximum 6000 rpm to 7000 rpm) toward the bolt while sensing the fluctuation with the light receiving means, and the Lt nut is screwed onto the bolt to maintain a predetermined state. When the screw is positioned, this is sensed by the amount of variation in the light and the screwing is completed. In this way, the castle nut can be screwed into the bolt with an appropriate torque value without requiring any special skill or heavy physical labor.

(Question 8 to be solved by the invention) By the way, J: In the conventional device mentioned above, the terminals connected to the light emitting means and the light receiving means respectively arranged on the rotating socket are arranged on the outer peripheral surface of the socket. A plunger or a slip ring that makes sliding contact with the terminal is provided on the fixed outer cylinder, and electrical signals are exchanged via the terminal and the plunger or slip ring. As a result, there have been some problems in that the sliding parts are worn out, resulting in poor contact, and signals cannot be sent and received properly. In addition, since a special sliding part is provided for sending and receiving electrical signals,
There are also problems in that the device becomes complicated and large, and installation space and work space are restricted.

The present invention has been made in view of the above-mentioned problems, and eliminates the need for complicating and increasing the size of the device, thereby reducing space constraints.Furthermore, it eliminates poor contact at the sliding portion, and improves the rotational speed of the device. Tightening the carousel nut provides a cotter pin alignment detection socket that can always properly communicate electrical signals between the light emitting means and light receiving means arranged on the fixed side and the N, source, and signal output section arranged on the fixed side. The purpose is to

(Means for solving the problem) Regarding the means for achieving the above objectives, see Sections 1.2 and 3.
．． Referring to FIG. 9, the present invention provides a nut holding means 30 into which a castle nut 1 having a cotter pin groove 3 is fitted, and a rolling bearing (hereinafter referred to as a rolling bearing) as a bearing means on a cylindrical case 10 side. , bearing) 21, 22, 2:
The castle nut l is rotatably disposed via the nut holding means 30, and the castle nut l is screwed onto the bolt 4, and the light emitting element 81 and the light receiving element 82 disposed on the nut holding means 30 are used. Tighten the castle nut to position the pin groove 3 in the through hole 5 of the bolt 4 by connecting the power source 13 and the light emitting element 81 provided on the case 10 side to the bearing 21.23 in the split pin alignment detection socket.
The signal output section 12 and the light receiving element 82, which are electrically connected to each other via a bare link 21.
It is characterized in that it is electrically connected via 22. The bearing means is not limited to the above-mentioned bearings 21, 22, 2:1, but may be, for example, a sliding bearing as long as it is electrically conductive.

(Function) Since the present invention is configured as described above, power from the power source is supplied to the light emitting element through the bearing means, and the light emitting element receiving the power emits light, while the pin groove of the castle nut and the bolt By matching the through holes, light emitted from the light emitting element is taken into the light receiving element, photoelectric conversion is performed by the light receiving element, and this electrical signal is sent to the signal output section on the case side via the bearing means. As a result, there is no need to provide a new sliding part to exchange electrical signals between the rotating side and the stationary side, which reduces the complexity and size of the device and reduces the space constraints. . Moreover, since the bearing means is used to exchange electrical signals between the rotating side and the stationary side, wear is suppressed, so there is no contact failure like in the past (example). An example will be explained in detail based on the drawings.

In FIGS. 2 and 3, reference numeral 10 denotes a cylindrical case made of an insulating material, and inside the case 10 there are three roller bearings (hereinafter referred to as bearings) made of a conductive material as bearing means. 22 and 23 are arranged side by side in a mutually insulated state, and the nut holding means 30 is rotatably provided via these bearings 21 and 22 and 23. A rectangular terminal box 11 is provided protruding from the outer periphery of the case 10. Bearings 21, . 22, 2: each outer lace 211, 22 of l
Lead wires 31, 32 and 33 are connected to 1 and 231, respectively. Lead & 13L, 32.33 is terminal box l
l being pulled out. Further, as shown in FIG. 1, the Leet wire 31 is grounded. And the lead wire 32
A signal output section 12 and a power source 13 are provided between the lead wire 33 and the grounding section and between the lead wire 33 and the grounding section, respectively. In this case, the signal output section 12 and the power source 13 need only be disposed on the fixed side with respect to the rotating nut holding means 30, and may be disposed on the case 10 or at other locations. .

As shown in FIGS. 2 and 4, the nut holding means 30 includes a cylindrical shaft 40 and a hexagonal recess 51 which is integrated with the shaft 40 and into which the castle nut 3 shown in FIG. 9 is fitted. The formed socket main body 50 is fitted onto and held by the shaft 40, and the bearings 21, 22
．． 23 inner races 212, 222, 232 are fixed to the mounting shaft 60.

A tightening tool 100 such as an impact wrench is fitted into the base end of the shaft 40, and the nut holding means 30 is rotated by the tightening tool 100.

There are recesses 65 or jL approximately every 120° on the outer circumference of the mounting shaft 60.
; has been accomplished. Hair ring 21. in each quarter 65.
22. Each of the inner races 212, 222, 232 of 23 is connected to the inner race 212 in one recess 65 which is in an exposed state, and the -I- wire 61 or the other four parts 65 are connected to each other.
The leet wire 62 is connected to the inner race 222 at the inner race 222, and the saw 1 wire 63 is connected to the inner race 232 at the other four parts 65, respectively.

As shown in FIG. 3.4, the socket body 50 has fan-shaped flanges 52 formed at intervals of 120° on its outer periphery. A substantially wedge-shaped sensor mounting member 53 as shown in FIG. 5.6 is held between adjacent flanges 52. A light emitting element 81 such as a light emitting diode and a light receiving element 82 such as a phototransistor are disposed on both sides of the sensor mounting member 53, and are fixed to the sensor mounting member 53 by sensor mounting screws 54. Note that the socket main body portion 50 in which the one light emitting element 81 and the light receiving element 82 are disposed is provided with a small hole 55 for light passage, as shown in FIG. 3.4.

As shown in FIG. 3, the small holes 55 are formed at six locations corresponding to each side of the hexagonal four parts 51. Two small holes 55 arranged in a straight line with the four parts 51 in between form a pair. A light emitting element 81 is disposed in the pair of power holes 55, and a light receiving element 82 is disposed in the other small hole 55.

A printed circuit board 70 is provided on the mounting shaft 60 near the socket body 50. The printed circuit board 70 is No. 7.8
As shown in the figure, they are arranged corresponding to the four parts 65. The printed circuit board 70 has an amplifier circuit 71 as shown in FIG.
．． A transistor 72 and a constant voltage resistor 73 are provided. The amplifier circuit 71 is connected to the lead wire 63 and the lead wire 61, and is operated by the drive voltage supplied through the lead wires 6] and 5:l to amplify the detection signal of the light receiving element 82. Lead wire 63 via wiring
and the light emitting element 81 are connected. transistor 72
is emitter grounded via a lead wire 61. Further, the transistor 72 takes in the amplified signal from the amplifier circuit 71 at its base, performs processing such as amplification, and sends the obtained signal to the lead wire 62 from its collector. In this embodiment, the output signals of the three transistors 72 are collectively sent to the lead wire 62.

The operation of the castle nut tightening and cotter pin alignment detection socket constructed as follows will be explained with reference to the accompanying drawings.

First, insert the castle nut 1 into the four parts 51 of the socket body part 51), and tighten the socket body part 50 by 1.
The tool 100 is fitted. Then, align the port T-4 and tighten +I, the tool 10 is activated, and the power source 13 is activated.
or is turned on.

Then, the nut holding means 30 rotates relative to the bolt 4 while holding the castle nut 1 (in this state, the small hole 55 and the split pin groove 3 are aligned), and the castle nut 1 is attached to the bolt 4. It gradually gets screwed in. on the other hand,
When the power source 13 is turned on, power is supplied to the light emitting element 81 via the bearings 21 and 23, and the light emitting element 81 emits light.

Then, the split pin groove 3 of Castlena Soto 1 and the pole l-
When the through-holes 5 and 4 coincide with each other, light emitted from the light-emitting element 81 is taken into the light-receiving element 82. The light receiving element 82 takes in light and performs photoelectric conversion.

The electric signal obtained here is outputted to the signal output section 12 on the case IO side via the bearings 22 and 21. In this way, each time the split pin groove 3 and the through hole 5 coincide, an electric signal indicating this is sent to the signal output section 12, thereby clarifying the positional relationship between the castle nut 1 and the bolt 4 in the screwed state. When the predetermined positional relationship is reached, the castle nut 1 is screwed onto the bolt 4 with a predetermined torque value. become a state.

In this way, the exchange of electrical signals between the rotating side and the stationary side is performed using the bearings 21, 22, and 23, eliminating the need for new sliding parts and making the equipment larger and more complex. bearing 21,
22.23 is used to exchange electrical signals,
Wear is suppressed and contact failures are no longer caused.

Thereafter, the castle nut 1 is removed from the nut holding means 30 while being screwed onto the bolt 4. Then, the split pin 2 is inserted into the split pin groove 3 of the castle nut 1 and the through hole 5 of the bolt 4, and is held more securely.

For example, it is common practice to use a DC power source to energize the light emitting element through two wires to cause it to emit light, while connecting two wires to the light receiving element to extract the photoelectric conversion signal. In this example, a printed circuit board is used to supply power to the light-emitting element and take out the photoelectric conversion signal from the light-receiving element with three lead wires, which is an effect of making the device smaller and simpler. be.

(Effects of the Invention) As described in 1-1 below, the present invention supplies power from a power source to the light emitting element through the bearing means, and also aligns the cotter pin groove of the castle nut with the through hole of the bolt. When the light emitted by the light emitting element is captured by the light receiving element, the light receiving element performs photoelectric conversion, and the electric signal obtained here is sent to the signal output section via the bearing means, so it can be divided into the 5th rotation side and the fixed side. There is no need to create a new sliding part to exchange electrical signals between the rotating side and the fixed side, which simplifies the device.The device is also downsized, allowing for sufficient work space. Since the bearing means is also used for the exchange of electrical signals, the influence of wear is reduced and contact failures are eliminated.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing a castle nut tightening cotter pin alignment detection socket according to an embodiment of the present invention, and Figs. 2 and 3 are a schematic sectional view and a schematic diagram respectively showing the amount detection socket 1. FIG. 4 is a side view, FIG. 4 is a perspective view showing the shaft and socket body of the detection socket, FIGS. 7 and 8 are a cross-sectional view and a schematic diagram, respectively, showing the arrangement position of a printed circuit board applied to the detection socket. FIG. 9 is a section showing castle nuts, bolts and split pins. l...Castle nut, 3...Cotter pin groove, 4...
・Bolt, 5...Through hole, l...Case, 12...
・Signal output section, 13...power supply, 21.22.23...
・Bearing, 30...! holding means, 50.
...Socket main body, 81...Light emitting element, 82...
Light receiving element. Patent Applicant: Toyota Motor Corporation, Uryu Manufacturing Co., Ltd. 8- @1 Figure 21 7J Luk Figure 2 Figure 4 Figure 5 Figure 7 Figure 8

Claims (1)

[Claims] A nut holding means into which a castle nut having a split pin groove is fitted is rotatably disposed in a cylindrical case via a bearing means, and the nut holding means is rotated to attach the castle nut to the bolt. In the castle nut tightening cotter pin positioning detection socket, which positions the cotter pin groove in the cotter pin insertion hole of the bolt using the light emitting means and the light receiving means provided in the nut holding means, electrically connecting the provided power source and the light emitting means via the bearing means, and electrically connecting the light receiving means to a signal output section disposed on the case side via the bearing means. A castle nut tightening cotter pin alignment detection socket featuring: