JPS59219174A - Torque adjusting apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The invention of B relates to an improvement of a torque adjusting device for, for example, an electric screwdriver.

A conventional torque adjustment device of this kind consists of a drive-side clutch disk provided on the output shaft, a driven 6+11 clutch disk provided on the tool drive shaft and opposed to the drive-side clutch disk, and a second driven clutch disk. A coil spring that pushes the side clutch disk toward the drive side clutch disk, a spring receiver that receives the load side of the coil spring B, and a casing that supports the spring receiver B so that it can freely slide in the axial direction. , a cylindrical rotating shaft material disposed on the outer periphery of the casing, facing the load side end of the spring receiver and having a #i1 surface inclined in the circumferential direction, and for rotating the cylindrical rotating member. J. The spring receiver moves 17 in the axial direction along the inclined end surface to compress the coil spring, thereby pressing the driven side Cla and Sochi disks against the driving side Cla and Sochi disks with a predetermined pressure, Torque corresponding to the pressure is transmitted from the output shaft to the tool drive shaft.The torque setting is determined by providing protrusions at predetermined intervals on the inclined end surface of the cylindrical rotating member, that is, step-like protrusions. is limited to a predetermined value, and is configured to prevent positional deviation 1 from occurring from the inclined end surface. However, if the protrusion is provided on the inclined end surface and is used as a device with large vibrations, it will be difficult to use a spring catch or moth.
There is a drawback that the torque is low when driving due to deviation from the fil.

This invention was made in order to eliminate the disadvantages of 1 and 6 of the conventional system, in which the end face of the cylindrical rotating member and the end face of the cover are engaged with each other with unevenness, and the cover is used to rotate the cylindrical rotating member. By elastically pressing the end face of the member, it is possible to ensure the engagement between the go-shaped co-moving member and the cover, and prevent a decrease in torque during operation. Ri tone too? It provides equipment.

An embodiment of the invention of B is shown below in FIGS. 1 to 3; Tips 7. explain. Figure: Here, J is case piece 1A, IB
2 is the load side end 21 of case 1.
The bottom 2A is rotatably fitted around the periphery and fixed in its axial position with respect to the case J, with a bottom 2A at the end of the load side, a ring-shaped protrusion 2B projecting from the load side (ζ) on the outer peripheral edge of the bottom 2A, and a ring-shaped protrusion 2B that projects from the bottom 2A. A plurality of recesses 2D are provided at regular intervals in the circumferential direction of the reflector 2D, and an inclined surface 2C having a height in the axial direction is provided on the inner circumference.
and a hole 2. into which a radial ball bearing (to be described later) is fitted into the middle J-rim of the bottom 2. Aa and the predetermined rotation angle for the sliding protrusion described later! ! The circular arc-shaped long hole 2Ab that can be rotated and fitted into the
3 is a cylindrical rotating member, 3 is an electric motor, and 4 is a cylindrical rotating member, 1 is a motor, and 4 is a cylindrical rotating member.
A reduction gear mechanism driven by the electric motor 3, 4A is an output shaft of the reduction gear mechanism 4σ), 5 is a drive-side clutch disk fixed to the shaft end of the output shaft 4A, and the shaft center of the output shaft 4A is connected to the load-side end surface. There are 11 concentric recesses 5a in the circumferential direction. , 6 are opposed to the drive side clutch disc 5 and are located in the recess 5.
A driven side clutch disc 7 has a plurality of axial through holes 6a paired with a and a small diameter portion 6b on the negative front side, and 7 is fitted across the recess 5A and the through hole 6A and is a driving side clutch disc 5. and the driven side clutch 1. 8 is a steel ball that connects the clutch disc 6 on the driving side, the anti-load side surface that surrounds the clutch disc 5 on the driving side and the clutch disc 6 on the driven side and is non-rotatably fitted to the inner periphery of the load side end of the case 1. 8a, a bearing housing part 81) that supports a radial ball bearing (to be described later), a column 8C that integrally connects the cylindrical part 8a and the bearing 1/jag part 8b, and a bearing 7' housing part 8b.
and a projection 8d formed on the load side opening periphery of the load side so as to protrude toward the load side and fit loosely into the elongated hole 2Aa,
9 is a run-al ball bearing that is fitted and supported by the bearing housing 8b, and whose outer periphery on the load side is loosely fitted into the hole 2Aa;
] 0 is a tool drive shaft rotatably supported by a radial ball bearing 9, and a driven side clutch disk 6 is tightly fitted to the opposite end of the load side.
It supports IJ, 12 is a disc-shaped steel ball receiver that fits into the small diameter portion 6I + outer periphery of the driven side clutch disc 6;
The disc-shaped steel ball bearing is a thrust needle bearing that transfers the load side of the work 1, and the load side end of the compression fill spring 13 that presses the steel ball 7 against the drive side clutch disc 5).
- 2w4 is disposed so as to be received on the load side end face of the one dollar bearing 12: The second w4 is arranged to receive the load side end of the dollar bearing 12, and is formed to protrude on the opposite load side and is attached to the outer periphery of the coil spring 13. The coil spring 13 is supported by the fitted coil spring support part 14a, and a part of the outer periphery engages with the column 8C, so that the co-movement is stopped, and the co-move member is moved in the direction in which the coil spring 13 is compressed. When 2 is rotated by a predetermined rotation angle, the tip of the coil spring support J4a comes into contact with the load side of the thrust needle bearing 12, and 15 is a screw attached to the tip of the protrusion 8d so as to cover the load side end of the radial ball bearing 9.] A disc-shaped housing cover fixed to the radial ball bearing 9 and having a shape of 1111 has a recess on the opposite surface of the radial ball bearing 9 so as not to come into contact with the inner ring of the ball bearing 9.
A protrusion 15b that can be engaged with the recess 2Da on the end surface 2D side of the cooperating member 2 is provided, and the outer circumferential surface faces the inner circumferential surface of the ring-shaped protrusion 2B with a small gap therebetween. Note that the housing cover 15 elastically presses the end surface 2[) of the rotating member 2. Reference numeral 17 is a t-cochuck attached to the load side end of the tool drive shaft 10, 18 is an electric drive; be.

In the case configured like B, switch 19 is
When turned on, the electric PA3 rotates, and the reduction gear mechanism 4 → the drive side clutch disc 5-#PlfJ7 → the driven side clutch disc 6 → the tool drive shaft 10 → the pin 1-2 via the chuck 17.
Since 0 rotates, you will have to do some turning work.; 1k,
When rotating the rotating member 2, the inclination of the inner circumference @11fii z
As the axial position of the spring receiver 14 changes as the spring 11 moves c, the spring 13 contracts, and the four parts 20a provided on the rotating member 2 engage with the protrusion 15b of the housing cover 16. Since the co-moving member 2 can be held in any position, the driven side clutch disc 6 h' jil
fJi 7, J, steel ball 7 is drive side clutch disk 5
As the pressing force for pressing changes and the suppressing force increases, it becomes difficult for the steel ball 7 to separate from the recess 511, and the drive side clamp.
When the transmission 1-lux value from the Sochi disk 5 to the driven clutch disk 6 becomes large and the above-mentioned pressing force becomes small, the above-mentioned transmission 1-
The tb value also becomes small. The so-called (-) torque adjustment of the co-acoustic moving shaft 10 can be performed.In addition, the housing cover 16
is formed into a dish shape, and when pressed against the rotating member 2, elastically presses the rotating member 2.

Note that the recess 2Da provided in the rotating member 2 may be a flat or spherical surface, and needless to say, it is not limited to that of the above embodiment. As described above, the invention of B is provided with a dish-shaped cover that is widened opposite to the load side end face of the cylindrical rotating member and fixed to the end face of the casing, and In addition to engaging the cover with the unevenness, the end face of the cylindrical rotating member is elastically suppressed by the cover described in 1. Therefore, the engagement force due to the unevenness between the cylindrical rotating member and the cover is combined with the elastic force of the cover. Since this is added, the engagement of both sides can be reliably maintained even on a lifting platform where vibrations occur in the main body, which has the effect of reliably preventing a drop in torque during operation.

[Brief explanation of drawings]

The drawings show an embodiment of the invention of B, in which Fig. 1 is an overall configuration diagram, and Figs. 2 and 3 are sectional views of essential parts. In the figure, 1 is a case, 2 is a rotating member, 20a is a recess, 3 is an electric motor, 4 is a reduction gear mechanism, 5 is a drive side clutch disk, 6 is a driven side clutch circle 41x, 7 is a steel ball , 10 is a tool drive shaft, 13 is a compression coil spring, 14 is a spring receiver, ] 5 is a housing cover, and 15b is a projection. Note that the same symbol in the figures indicates the same or equivalent part. Agent Masu Oiwa ul・;7
I 1st I 423 Figure 2

Claims (1)

[Claims] A driven OI provided on the drive side shaft and a drive side clutch disk, and a driven OI provided on the driven side shaft and facing the drive side clutch disk.
A re-clutch disc, a coil spring that presses the driven clutch disc of B towards the driving clutch disc, a spring receiver that receives the load side of the coil spring, and a spring receiver that allows the spring receiver of B to freely slide in the axial direction. a casing, a cylindrical rotating member arranged on the outer periphery of the casing and having a circumferentially inclined end face facing the load side end of the spring receiver, and facing the load side end face of the cylindrical rotating member B; (7) A dish-shaped cover fixed to the end face of the casing; A torque adjustment device that elastically presses the end face of a similar rotating member.