JP2007247553A - Lead wire leading out device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a test to be continued for a long period of time without fracture of a flat spring even if a flat spring is employed instead of an existing link device when lead wire from a sensor embedded in a piston is led out to the outside of a crankcase. <P>SOLUTION: The flat spring 12 having a one end side connected to a large end part 5b of a connecting rod 5 supporting a piston 3, projecting out of the crankcase 13 through a cutout part 14, bending downward in another end side and connecting to a lower end part of the crankcase 13 is provided. A bearing 15 of a rotary shaft O in parallel with a crankshaft 6 is installed in a connection section of another end of the flat spring 12 and a lower end part of the crankcase 13. The flat spring 12 is constructed in such a manner that the another end of the same can displace around the rotary shaft O of the bearing 15. The lead wire 10 led to the large end part 5b of the connecting rod 5 from the piston 3 is laid along the flat spring 12 and is led out of the crankcase 13. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lead wire deriving device.

  When a test is performed with a reciprocating engine such as an air compressor being used as a test object and a sensor is embedded in the piston, a lead wire deriving device for leading the lead wire from the sensor to the outside of the crankcase is required.

  That is, in the current test, the lead wire led from the piston to the large end of the connecting rod is led out of the crankcase using the link device, and the link device is bent and deformed following the lifting and lowering operation of the piston. By arranging the lead wires, it is possible to avoid the possibility that the lead wires interfere with or entangle the surrounding structure.

Note that, as prior art document information related to collection of measurement values in a test in which this type of reciprocating engine is used as a test object, there is Patent Document 1 below.
JP-A-9-177561

  However, there is a demerit that it takes a lot of time to design the link device according to the reciprocating engine to be tested and the processing cost is high, and the link device is set in the reciprocating engine. In addition, there is a problem that it takes a lot of man-hours to make the link device have a lead wire.

  In addition, in the old days, a method was also used in which a leaf spring, which is more cost-effective than a link device and easy to prepare, was bent and used, and a lead wire was put on the leaf spring and led out of the crankcase. There is.

  However, in such a system using a leaf spring, unless the length of the leaf spring is increased to some extent and the allowable amount of bending is increased, bending stress concentrates on the fixed end of the leaf spring and the like repeatedly. However, by increasing the length of the leaf spring, this increases the weight of the leaf spring itself and increases the load due to inertial force. There was a problem that it was easy to resonate and easily break.

  Therefore, at present, the lead wire is not led to the outside of the crankcase using a leaf spring, and the link device is adopted by closing the eyes because the cost disadvantages and preparations are troublesome. The fact is.

  The present invention has been made in view of the above-described circumstances, and when the lead wire from the sensor embedded in the piston is led out of the crankcase, even if a leaf spring is used instead of the existing link device, the leaf spring is used. The purpose is to allow the test to be continued for a long time without causing breakage.

  The present invention is a lead wire lead-out device for leading a lead wire from a sensor embedded in a piston of a reciprocating engine to be tested to the outside of a crankcase, and one end side of a large end portion of a connecting rod that supports the piston. Is connected to the lower end of the crankcase by bending the other end side downward and connecting to the lower end of the crankcase. A bearing of a rotating shaft parallel to the crankshaft is interposed at a connection point with the lower end, and the other end of the leaf spring can be displaced around the rotating shaft of the bearing. The lead wire led to the point is guided to the outside of the crankcase along the leaf spring.

  Thus, in this way, the piston moves up and down, and the large end of the connecting rod moves around the crankshaft, thereby connecting the large end of the connecting rod and the lower end of the crankcase. The other end of the leaf spring is displaced around the rotation axis of the bearing at the lower end of the crankcase even if the amount of deflection of the crankcase changes. In the case of fixing, stress concentration that occurs at the fixing portion is avoided in advance.

  As a result, even if the length of the leaf spring is made shorter than that conventionally required, stress concentration does not occur at the connection point between the other end of the leaf spring and the lower end of the crankcase. It is possible to reduce the weight to suppress the inertial force and to prevent the resonance with the operation vibration of the reciprocating engine, and it is possible to continue the test for a long time without causing the leaf spring to break.

  According to the above-described lead wire deriving device of the present invention, when the lead wire from the sensor embedded in the piston is led out of the crankcase, even if a leaf spring is used instead of the existing link device, Since the test can be continued for a long time without causing breakage, the time required for the design is reduced and the processing cost is kept low compared to the case where the existing link device is adopted. In addition, the test preparation can be easily performed with a small number of man-hours, so that the labor of the examiner can be saved significantly.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows an example of an embodiment for carrying out the present invention. In FIG. 1, reference numeral 1 denotes an air compressor of a reciprocating engine to be tested. In the air compressor 1, a piston 3 accommodated in a cylinder 2 is a piston. The connecting rod 5 is connected to a small end portion 5 a via a pin 4, and the connecting rod 5 has a large end portion 5 b connected to a crank arm 7 that rotates integrally with the crankshaft 6 via a crankpin 8.

  Here, for example, a sensor 9 for detecting the hydraulic pressure under the oil ring is embedded in the piston 3, and the lead wire 10 from the sensor 9 is prevented from rotating with respect to the small end portion 5 a of the connecting rod 5. Is passed through the inside of the piston pin 4 to which the piston rod 4 is applied (see FIG. 2), and through the through-hole 11 drilled in alignment with the piston pin 4 and the small end portion 5a of the connecting rod 5, the connecting rod 5 is led to the large end 5b while being wound on the side surface of the connecting rod 5 with a wire (not shown), and the outer side of the crankcase 13 while being wound on the leaf spring 12 (not shown) with a wire (not shown). To be led to.

  The leaf spring 12 leading the lead wire 10 from the large end portion 5b of the connecting rod 5 to the outside of the crankcase 13 is connected to the large end portion 5b of the connecting rod 5 at one end side so that the notched portion 14 extends from the crankcase 13. And the other end side is bent downward and connected to the lower end of the crankcase 13.

  However, a bearing 15 (miniature bearing) of a rotating shaft O parallel to the crankshaft 6 is interposed at a connection portion between the other end of the leaf spring 12 and the lower end portion of the crankcase 13. The other end of the leaf spring 12 can be displaced around the rotation axis O.

  That is, the bearing 15 has a structure in which a roll 17 is rotatably supported by a bearing housing 16 as shown in detail in a sectional view seen from above in FIG. The other end of the leaf spring 12 is mounted via a rivet, a screw or the like, and the other end of the leaf spring 12 is displaced around the rotation axis O by the roll of the roll 17 as shown in FIGS. It is. Note that one end of the leaf spring 12 is fastened together with a bolt for externally fitting and fixing the large end portion 5 b of the connecting rod 5 that is halved to the crankpin 8.

  Thus, if the lead wire lead-out device is configured in this way, the piston 3 moves up and down and the large end portion 5b of the connecting rod 5 moves around the crankshaft 6, thereby the large end portion 5b of the connecting rod 5 and the crankcase. 13, the other end of the leaf spring 12 is displaced around the rotation axis O of the bearing 15 at the lower end portion of the crankcase 13 even if the amount of bending of the leaf spring 12 connecting the lower end portion of the bearing 13 changes. Therefore, when the other end of the leaf spring 12 as shown in FIG. 6 is directly fixed to the lower end portion of the crankcase 13, stress concentration that occurs at the fixing portion is avoided.

  As a result, even if the length of the leaf spring 12 is made shorter than that conventionally required, stress concentration does not occur at the connecting portion between the other end of the leaf spring 12 and the lower end portion of the crankcase 13. It is possible to reduce the weight of the spring 12 itself, to suppress the inertial force and to prevent resonance with the operation vibration of the air compressor 1, and to continue the test for a long time without causing the leaf spring 12 to break. It becomes possible.

  Therefore, according to the above embodiment, when the lead wire 10 from the sensor 9 embedded in the piston 3 is led out of the crankcase 13, even if the leaf spring 12 is used instead of the existing link device, the leaf spring Since the test can be continued for a long time without causing breakage in 12, the time required for the design is reduced and the processing cost is reduced compared with the case where the existing link device is adopted. In addition, it is possible to reduce the labor of the tester by making it easy to prepare for the test with a small number of man-hours.

  In addition, the lead wire derivation device of the present invention is not limited to the above-described embodiment. The reciprocating engine to be tested is not necessarily limited to the air compressor, and the engine or the like may be the test target. In addition, it goes without saying that various changes can be made without departing from the scope of the present invention.

It is sectional drawing which shows an example of the form which implements this invention. It is sectional drawing of the II-II arrow of the piston of FIG. It is sectional drawing seen from the upper direction of the bearing of FIG. It is sectional drawing of the roll of FIG. 3 at the IV-IV arrow. It is sectional drawing which shows the state which the roll of FIG. 4 rolled to reverse direction. It is a side view which shows the state at the time of fixing the other end of a leaf | plate spring directly.

Explanation of symbols

1 Air compressor (reciprocating engine to be tested)
3 Piston 5 Connecting rod 5a Small end 5b Large end 6 Crankshaft 9 Sensor 10 Lead wire 12 Leaf spring 13 Crankcase 14 Notch 15 Bearing O Rotating shaft

Claims (1)

  A lead wire lead-out device for leading a lead wire from a sensor embedded in a piston of a reciprocating engine to be tested to the outside of a crankcase, with one end connected to the large end of a connecting rod that supports the piston A leaf spring extending from the crankcase through the notch and projecting the other end side downward and connected to the lower end portion of the crankcase, and the other end of the leaf spring and the lower end portion of the crankcase A lead that leads from the piston to the large end of the connecting rod is configured such that the other end of the leaf spring can be displaced around the rotation axis of the bearing by interposing a bearing of the rotation axis parallel to the crankshaft at the connection location. A lead wire deriving device, wherein a wire is guided to the outside of the crankcase along the leaf spring.

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