JP5101034B2 - Exhaust manifold bolt tightening tool with tightening adapter - Google Patents

Description

  The present invention is applied to an exhaust manifold tightening bolt of an engine, etc., and is provided with a tightening adapter that is attached to a torque wrench and transmits a tightening force applied by the torque wrench to a spanner engaged with the tightening bolt. The present invention relates to a bolt tightening tool for a manifold.

  An exhaust manifold of a diesel engine is fastened and fixed to a top surface of a cylinder head by a plurality of fastening bolts. These exhaust manifold tightening bolts are made of a heat-resistant steel material that has a relatively low tensile strength in addition to tightening the high-temperature exhaust manifold, so if the tightening torque is excessive, the tightening bolt will be broken and the tightening torque will If it is too small, gas leakage will occur at the clamping surface between the exhaust manifold and the upper surface of the cylinder head. For this reason, it is necessary for such an exhaust manifold tightening bolt to accurately maintain the tightening torque within the required tightening torque range.

One of the means for maintaining the tightening torque of the tightening bolt with high accuracy is a technique provided in Patent Document 1 (Japanese Patent Laid-Open No. 9-285972).
In such a technique, a strain gauge is attached to a socket of a tightening tool, the amount of strain detected by the strain gauge at the time of bolt tightening is converted into a tightening torque by a torque conversion circuit, and the tightening torque is viewed while viewing the displayed value. The tightening torque is managed so that the tightening torque becomes a required value.

JP-A-9-285773

As described above, the tightening bolt of the exhaust manifold of the diesel engine is used for avoiding both the breakage due to the excessive tightening torque of the tightening bolt and the occurrence of gas leakage on the tightening surface due to the excessive tightening torque. When tightening the tightening bolt, it is necessary to accurately maintain the tightening torque within the required tightening torque range.
However, since other engine components are close to the periphery of the tightening portion of the exhaust manifold on the cylinder head upper surface, a strain gauge is attached to the socket of the tightening tool as in Patent Document 1 (Japanese Patent Laid-Open No. 9-285973). It is difficult to secure a space for installing a large-scale device that attaches the tape, detects the amount of distortion, and inputs the strain amount into the torque conversion circuit.
Further, such means requires a tightening tool socket with a strain gauge attached thereto, a torque conversion circuit for torque conversion of the strain amount, a display device for displaying the calculated value of the tightening torque, etc. However, there is a problem that the cost of the apparatus becomes high.

  In addition, in the means for tightening the bolt using a normal torque wrench, as described above, other engine parts are close to the periphery of the tightening portion on the upper surface of the cylinder head of the exhaust manifold. It is also difficult to secure a space for inserting and tightening the torque wrench to hold the tightening bolt at a required tightening torque.

  In view of the problems of the prior art, the present invention has a simple and low-cost structure, and maintains the tightening torque of the tightening bolt at a required value even in a narrow place such as around the tightening portion of the exhaust manifold. An object of the present invention is to provide a bolt tightening tool that can be easily tightened.

The present invention achieves such an object, and is a tightening adapter that is attached to a torque wrench and transmits a tightening force applied by the torque wrench to an exhaust manifold tightening bolt that tightens the flange portion of the exhaust manifold to an engine member such as a cylinder head. A bolt tightening tool for an exhaust manifold , wherein the tightening adapter forms an engaging portion that can rotate simultaneously with an upper end portion thereof and a tip rotating portion of the torque wrench, and tightens the exhaust manifold at a lower end portion. A wrench portion engaged with the hexagonal head of the bolt is fixed, and the engagement portion and the wrench portion are coupled with a connecting portion formed in a curved shape capable of avoiding interference with surrounding engine members. The rotation center of the joint part and the rotation center of the spanner part are made to coincide with each other, and the connecting part is substantially in the horizontal direction. Consists from the end of the building arm portion and the arm portion and the connecting rod extending downwardly, the arm portion is disengageably socket unit to the torque wrench on the top of one end side is welded, the other end of the arm portion The upper end of the connecting rod is welded to the lower part of the side, the connecting rod extends downward, and is inclined obliquely toward the center of rotation from the middle, and the lower end of the inclined connecting rod is It is welded and joined to an end of the spanner formed shorter than the arm (Claim 1).

According to the present invention, the clamping adapter is attached to the exhaust manifold to a torque wrench for tightening the exhaust manifold clamping bolt is tightened to the engine member, and simultaneously rotatably formed between this upper end portion and the distal end rotational portion of the torque wrench The engagement portion and the spanner portion engaged with the tightening bolt are coupled by a connecting portion formed in a curved shape capable of avoiding interference with surrounding inclusions such as engine parts, and the engagement is further performed. with the center of rotation of the parts is matched with the center of rotation of the spanner portion constituted by further the connecting portion is made from an end portion of the arm portion and the arm portion extending in a substantially horizontal direction and connecting rod extending downwardly, the arm is disengageably socket portion welded to the torque wrench on the top of one end, the upper end of the connecting rod is welded to the lower portion of the other end of the arm portion, the connecting rod Extends towards, is formed to be inclined obliquely to the rotational center side from the middle, the lower end of the connecting rod which is formed by the inclined is welded to an end of the wrench portion formed shorter than the arm portion since (claim 1), and other engine parts as peripheral clamping bolt to the cylinder head top surface of the exhaust manifold close, there in narrow places as 0.00 turning range for normal torque wrench However, a wrench portion that requires a small installation space is arranged around the tightening bolt, and the wrench portion is formed by a connecting portion formed so as to avoid interference with surrounding inclusions such as engine parts. Since the upper end of the connecting part arranged above the narrow space and the engaging part formed so as to be able to rotate at the same time by the tip rotating part of the torque wrench are connected, the torque wrench is arranged at a rotatable part. It is possible to perform the tightening operation of easily tightening bolts without being impaired inclusions around the engine parts.

  Furthermore, by matching the rotation center of the engaging part on the torque wrench side with the rotation center of the spanner part on the tightening bolt side, the actual tightening torque of the tightening bolt and the tightening torque value indicated by the torque wrench match. Thus, an operator holding the torque wrench can perform the tightening operation of the tightening bolt while looking at the tightening torque value of the torque wrench in front of him.

  Therefore, according to the present invention, the tightening adapter formed by connecting the engagement portion on the torque wrench side and the spanner portion on the tightening bolt side by the connecting portion formed in a curved shape is very simple and low in that it is simply attached to the torque wrench. Due to the cost structure, even if the tightening bolt is located in a narrow space such as around the tightening part of the exhaust manifold, the tightening torque of the tightening bolt is accurately maintained at the required value, and the tightening work is extremely easy. be able to.

  Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this example are not intended to limit the scope of the present invention only to specific examples unless otherwise specified. Only.

FIG. 1 is a side view of a bolt tightening tool provided with a tightening adapter according to an embodiment of the present invention, and FIG. 2 is a side view showing a state in which the bolt tightening tool is applied to a tightening bolt of an exhaust manifold.
1 and 2, 2 is a torque wrench, and 10 is a tightening adapter that can be attached to and detached from the torque wrench 2. The tightening adapter 10 includes a socket portion that constitutes an upper end portion that can be engaged with and disengaged from the torque wrench 2, a spanner portion 13 that can be engaged and disengaged with a hexagonal head of the tightening bolt 4, and the socket portion 11 and the spanner portion 13. It is comprised by the connection part 1 to couple | bond.
The connecting portion 1 is formed in a substantially U shape by an arm portion 14 extending in a substantially horizontal direction and a rod-like connecting rod 12 extending downwardly from the arm portion 14, and an upper portion on one end side of the arm portion 14. The socket portion 11 is welded and joined, the upper end of the connecting rod 12 is welded to the lower portion of the other end of the arm portion 14, and the spanner portion 13 is welded and joined to the lower end of the connecting rod 12. Tei Ru.

  As shown in FIG. 2, the connecting portion 1 of the tightening adapter 10 has a curved shape that can avoid interference with the exhaust manifold 3 and the surrounding engine member 8, and preferably has a substantially U shape as described above. The rotation of the spanner 13 that is formed and engages the rotation center 15 of the engagement portion between the torque wrench 2 and the socket portion 11, which is the rotation center of the torque wrench 2, and the hexagonal head of the tightening bolt 4. It is formed so as to coincide with the center 15.

  When performing the tightening operation of the tightening bolt 4 for the exhaust manifold 3 using the bolt tightening tool having the tightening adapter having such a configuration, as shown in FIG. 2, the exhaust for tightening the exhaust manifold 3 to the cylinder head 7 of the engine. The tightening adapter 10 attached to the torque wrench 2 for tightening the manifold tightening bolt 4 (6 is a cylindrical spacer, 5 is a set nut) is connected to the socket 11 of the tightening adapter 10 at the tip of the torque wrench 2. The connecting portion 1 that connects the engaging portion engaged with the rotating portion and the spanner portion 13 engaged with the tightening bolt 4 avoids interference with the exhaust manifold 3 and the engine component 8 adjacent to the tightening bolt 4. Since it is formed in a substantially U-shape (curved shape) that can be used, an exhaust mask such as around the tightening bolt 4 is used. A wrench that requires a small installation space around the tightening bolt 4 even in a narrow place where the hold 3 and other engine parts 8 are close to each other and a rotation range cannot be obtained with a normal torque wrench. Torque wrench in which the portion 13 is disposed and the spanner portion 13 is disposed in a wide space above the connecting portion 1 formed so as to avoid interference with the exhaust manifold 3 and the adjacent engine component 8. The torque wrench 2 can be easily rotated without being obstructed by the exhaust manifold 3 and other engine parts 8, and the tightening operation of the tightening bolt 4 can be performed.

  Furthermore, since the rotation center 15 of the engaging part (socket part 11) on the torque wrench 2 side and the rotation center 15 of the spanner part 13 on the tightening bolt 4 side are matched, the actual tightening torque of the tightening bolt 4 The tightening torque value instructed to the torque wrench 2 coincides, so that the operator who holds the torque wrench 2 can perform the tightening operation of the tightening bolt while looking at the tightening torque value of the torque wrench 2 immediately before. .

  Therefore, according to this embodiment, the tightening adapter 10 formed by connecting the engaging portion (socket portion 11) on the torque wrench 2 side and the spanner portion 13 on the tightening bolt 4 side with the connecting portion 1 formed in a curved shape, Even if the tightening bolt 4 is located in a narrow place such as around the tightening portion of the exhaust manifold 3 with a very simple and low-cost structure that is only attached to the torque wrench 2, the tightening torque of the tightening bolt 4 Can be held at the required value accurately and tightening can be performed very easily.

  According to the present invention, with a simple and low-cost structure, even in a narrow place such as around the exhaust manifold tightening portion, the tightening torque of the tightening bolt can be maintained at a required value and the tightening operation can be performed very easily. Can provide the bolt tightening tool to get.

It is a side view of a bolt tightening tool provided with a tightening adapter according to an embodiment of the present invention. It is a side view which shows the state which applied the bolt fastening tool to the fastening bolt of an exhaust manifold.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Connection part 2 Torque wrench 3 Exhaust manifold 4 Clamping bolt 7 Cylinder head 8 Engine part 10 Tightening adapter 11 Socket part 12 Connection rod 13 Spanner part 14 Arm part 15 Center of rotation

Claims (1)

This is an exhaust manifold bolt tightening tool equipped with a tightening adapter that is attached to a torque wrench and transmits the tightening force applied by the torque wrench to an exhaust manifold tightening bolt that tightens the flange portion of the exhaust manifold to an engine member such as a cylinder head. And
The tightening adapter constitutes an engaging portion that can rotate simultaneously with an upper end portion thereof and a tip rotating portion of the torque wrench, and a spanner portion engaged with a hexagonal head portion of the exhaust manifold tightening bolt at a lower end portion. The engaging portion and the spanner portion are coupled by a connecting portion formed in a curved shape capable of avoiding interference with surrounding engine members, and the rotation center of the engaging portion and the rotation center of the spanner portion Configured to match,
Further, the connecting portion includes an arm portion extending in a substantially horizontal direction and a connecting rod extending downward from the end portion of the arm portion, and the arm portion has a socket portion that can be attached to and detached from the torque wrench at an upper portion on one end side. The upper end of the connecting rod is welded to the lower portion on the other end side of the arm portion, and the connecting rod extends downward and is formed to be inclined obliquely from the middle to the rotation center side. A bolt tightening tool for an exhaust manifold having a tightening adapter, wherein a lower end portion of the connecting rod formed in this manner is welded to an end portion of the spanner portion formed shorter than the arm portion.

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