JPH0717472U - Torque wrench with nut runner - Google Patents

Abstract

(57) [Summary] [Purpose] Improvement of torque wrench with nut runner. [Structure] A one-way clutch is interposed between the power transmission shaft of the nut runner and the nut runner body. [Effect] It is also possible to perform screw tightening work by manual reciprocating operation.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a torque wrench with a nut runner that combines a torque wrench and a nut runner, and can automatically stop the power source supplied to the nut runner by the operation of the internal torque wrench that operates when tightening the tightened screw. It is about.

[0002]

[Prior art]

 As a conventional torque wrench structure with a nut runner, for example, a structure as shown in FIGS. 1 and 2 is known.

In such a known torque wrench with a nut runner, the head of the torque wrench is equipped with a small and low-movement vane air motor 41, and the driving force of the vane air motor 41 is reduced by a planetary gear 42. This power is used to rotate the drive angle 45 via the clutch 43 and the ratchet 44. Further, compressed air can be sent to the air motor 41 through a valve 47 attached to the handle 46 and a connecting pipe 48 to rotate the air motor 41.

Therefore, in order to tighten the screw 50 with the socket 49 fitted to the square drive 45, the valve 47 is operated to drive the air motor 41, thereby rotating the screw 50 at a high speed. After that, when the screw 50 is seated, the torque required to tighten the screw 50 rapidly increases, and as a result, the output torque of the small and low-motion air motor 41 cannot rotate any further, and the socket 49 stops. Therefore, the tightening operator rotates the handle 46 in the arrow direction and manually tightens the screw until the toggle 51 operates.

[0005]

[Problems to be solved by the device]

 However, in such a torque wrench with a nut runner, that is, a torque wrench that uses a power source such as air, since the ratchet mechanism is provided inside the torque wrench body, the torque wrench itself becomes large. Furthermore, there was a problem that tightening workability deteriorated due to this increase in size.

[0006]

[Means for Solving the Problems]

 The present invention has been made in view of the above conventional problems, and in a torque wrench with a nut runner, a cage shaft and a body provided between the drive shaft on the drive motor side and the output shaft on the socket side. By inserting a one-way clutch between the torque wrench and the torque wrench, the overall shape of the torque wrench can be adjusted to the shape suitable for the screw tightening work site (environment), and manual torque tightening can be performed reliably and easily. To provide a wrench.

[0007]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the embodiments shown in FIGS.

Reference numeral 1 is a torque wrench, 2 is a handle of the torque wrench, and a head 3 of the torque wrench 1 is fixed to a nut runner 5 by a mounting screw 4. Since the internal structure of the torque wrench 1 is a conventional well-known structure, a description of the structure will be omitted.

The nut runner 5 has a vane motor 7 incorporated inside a nut runner body 6. A drive shaft 8 of the vane motor 7 is connected via a first reduction gear 9 to a cage shaft 10 (power transmission shaft) which is located on the same axis as the drive shaft 8. Further, the cage shaft 10 is such that an output shaft 12 is meshingly connected via a second speed reducer 11. A one-way clutch 15 is interposed between an outer peripheral surface of the cage shaft 10 and an annular clutch piece 14 fixed to the inner peripheral surface of the body 6 via a fixing pin 13.

The one-way clutch 15 is a clutch that can rotate the cage shaft 10 in the clockwise direction, but cannot rotate in the opposite direction, as shown in FIG. 4, for example. Since this one-way clutch structure is a conventional well-known structure, detailed description of the structure is omitted. Reference numeral 16 indicates a drive lever of the vane motor.

The structure of this embodiment has been described above. Next, the operation thereof will be described. By operating the drive lever 16, pressurized air is supplied into the vane motor 7, whereby the drive shaft 8 and the cage shaft 10 are connected. The output shaft 12 is driven via this, whereby the screw or the like engaged with the output shaft 12 can be tightened.

When the screw tightening is completed, the reaction force (preset torque) acts on the head 3 of the torque lench, whereby the toggle operates and the air supply is stopped. It will be terminated.

Therefore, when the pressure air supply is stopped or the pressure is insufficient, the handle 2 of the torque wrench is manually operated to reciprocate to continue screw tightening. At times, the output shaft 12 tends to idle due to insufficient driving force of the vane motor, but this idle rotation is blocked by the one-way clutch 15, so that the ratchet (not shown) effectively operates, and as a result, the manual screw The tightening work is effective and reliable.

[0014]

[Effect of device]

 As described above, according to the present invention, in the torque wrench with nut runner, the power transmission shaft 10 connected to the drive shaft 8 of the vane motor 7 incorporated in the body 6 of the nut runner and the body 6 are connected. Since this is a torque wrench with a nut runner in which a one-way clutch 15 is interposed, according to this, for example, manual operation when the driving force of the vane motor is insufficient, or when the torque wrench is verified. The rotation of the output shaft can be effectively and reliably operated during manual operation, which has the effect of facilitating manual screw tightening and torque wrench work.

[Brief description of drawings]

FIG. 1 is a structural explanatory view of a conventional torque wrench with a nut runner.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a structural explanatory view of a torque wrench with a nut runner according to an embodiment of the present invention.

FIG. 4 is a sectional view taken along line BB in FIG.

[Explanation of symbols]

1 ... Torque wrench 2 ... Torque wrench Handle 3 ... Head 4 ... Mounting screw 5 ... Nut runner 6 ... Nut runner body 7 ... Vane motor 8 ... Drive shaft 9 ... First reducer 10 ... Cage shaft 11 ... Second reducer 12 ... Output shaft 13 ... Fixing pin 14 ... Clutch piece 15 ... One-way clutch 16 ... Drive lever

Claims (1)

[Scope of utility model registration request] 1. In a torque wrench with a nut runner, a power transmission shaft (10) connected to a drive shaft (8) of a vane motor (7) incorporated in a body (6) of the nut runner, and the body ( A torque wrench with a nut runner, characterized in that a one-way clutch (15) is interposed between the torque wrench and the nut runner.