JPS6339015Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tightening device for a stove cap used in an engine assembly line.

In a conventional engine in which an oil reservoir is integrally molded at the bottom of the crankcase, the bottom of the crankcase is closed, so that the axial direction of the crankshaft b formed in the crankcase a is blocked, for example, as shown in FIG. The stove cap d is bolted to the stove body e through the side opening c. In this case, the operator inserts an air-operated ratchet impact wrench or other power wrench f through the opening c and tightens the stove cap. Generally, the pair of tightening bolts g and g in d are tightened one by one, which takes time and
During the tightening work, workers were unable to do other work, which was one of the causes of reduced productivity.

In order to eliminate such inconveniences, the present invention aims to provide a device with a simple structure that allows the stove cap to be tightened by simply setting the device and then tightening the stove cap without requiring the operator's help. The purpose is to tighten the connecting rod cap, which is used to tighten the connecting rod cap 5 to the connecting rod main body 6 by inserting the power wrench 4 into the crankcase 1 through the opening 3 on one axial side of the crankshaft 2. The attachment device includes a machine frame 7 that is removably engaged with the crankshaft 2 and positioned thereto, and a spring 8 that urges the machine frame 7 in the tightening direction of the stove cap 5. A movable frame 9 supported so as to move forward and backward is provided, and a pair of tightening bolts 10, 10 of the stove cap 5 are attached to the movable frame 9.
The present invention is characterized in that a pair of wrenches 4 are provided in correspondence with the above.

FIG. 2 shows an example of its implementation, in which the machine frame 7 is composed of a rod-shaped frame with a guide ring 7a fixedly attached to the front end that engages with the crankshaft 2, and the rear end is A seat portion 7b that is bent into a substantially U-shape and comes into contact with the opening end surface of the crankcase 1.
The guide ring 7a is used for radial positioning of the crankshaft 2, and the seat 7b is used for axial positioning.

In the drawings, reference numeral 7c indicates a set handle protruding from the guide ring 7a.

The movable frame 9 has a guide bush 9 provided thereon.
A is slidably inserted and supported with the spring 8 inserted between the machine frame 7 and the U-shaped bent portion at the rear end, and the lower holder plate 9b is attached to the bush 9a. Attach a pair of power wrenches 4 consisting of air-operated ratchet trenches to this on the left and right,
Further, an operating shaft 12 connected to a wrench operating handle 11 is rotatably supported on the upper side of the bush 9a, and when the operating handle 11 is rotated, a bifurcated swing connected to the operating shaft 12 is rotated. A switch piece 1 for an operating valve provided to each wrench 4 via a movable arm 13
4 is pushed to the right side in the figure, so that each wrench 4 is operated.

In the drawing, 15 is an air joint and hanging base connected to each wrench 4, and 16 is a crankshaft 2.
The gear assembled in is shown.

Next, to explain its operation, the crankshaft 2 and the heat rod main body 6 are assembled into the crankcase 1 at the tightening station in which the present device is placed, and the heat rod cap 5 is loosely temporarily attached to the rear end of the heat rod main body 6 from the bottom side of the crankcase 1 with a pair of tightening bolts 10, 10. The crankcase 1 is then brought in with the opening 3 facing upward. First, the machine frame 7 is engaged with the crankshaft 2 at the guide ring 7a and the movable frame 9 is lowered while being retracted against the spring 8, and the tips of a pair of wrenches 4, 4 attached to the movable frame 9 are inserted through the opening 3 into the bottom side of the crankcase 1. Next, the machine frame 7 is positioned in the axial direction of the crankshaft 2 by abutting it against the open end face of the seat portion 7b, and then the movable frame 9 is released and both wrenches 4, 4 are operated by operating the wrench operating handle 11. This causes the tip of each wrench 4 to engage with and tighten the tightening bolts 10, and as they are tightened, the movable frame 9, and therefore each wrench 4, advances due to the biasing force of the spring 8, automatically tightening the stove cap 5. When using this device in this manner,
Once the machine frame 7 is positioned on the crankshaft 2, the movable frame 9, which is supported on the machine frame 7 so that it can move back and forth, moves forward due to the biasing force of the spring 8, and a pair of tightening bolts 10, 10 of the stove cap 5 are automatically tightened by a pair of power wrenches 4, 4 attached to it.During this time, the operator can perform other work, thereby improving productivity.In addition, since no special control mechanism is used, the device itself has a simple structure and can be obtained at low cost.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional example, and FIG. 2 is a perspective view of an example of the present device. 1... Crank case, 2... Crankshaft, 3... Opening, 4... Power wrench, 5... Cooking rod cap, 6... Cooking rod body, 7...
Machine frame, 8... Spring, 9... Movable frame, 10... Tightening bolt.

Claims (1)

[Scope of utility model registration request] A connecting rod cap tightening device used for inserting a power wrench 4 into a crankcase 1 from an opening 3 on one axial side of a crankshaft 2 and bolting a connecting rod cap 5 to a connecting rod main body 6, A machine frame 7 is removably engaged with the crankshaft 2 and positioned thereon, and the machine frame 7 is biased by a spring 8 in the tightening direction of the cooking rod cap 5 to support it so that it can move forward and backward. a movable frame 9, and one of the stove caps 5 is attached to the movable frame 9.
A tightening device for a stove cap, characterized in that a pair of wrenches 4 are provided corresponding to a pair of tightening bolts 10, 10.