JPH0581265U - Induction hardening equipment for the crankshaft flange - Google Patents

Abstract

(57) [Abstract] [Purpose] A coolant injection pipe provided on the front surface of a rotation unit of a coolant injection device having a rotation unit and a fixed unit to which a coolant is supplied is provided in a screw hole of a flange portion of a crankshaft. Accurately face each other mechanically. [Structure] An induction hardening apparatus is a straight line arranged to rotate mechanically in synchronization with a rotating part and to be in a predetermined position when a cooling liquid injection pipe is in a position facing a screw hole of a flange part. Dog-shaped rod 41 and a pair of first rods arranged in parallel
The dog bar stopper 42 provided with the arm 421 and the second arm 422 connecting the first arm 421, and the dog bar stopper 42 are connected to the dog bar 41.
And a proximity switch 45 for detecting that the dog rod 41 is in the substantially predetermined position. After the induction hardening of the flange portion of the crankshaft, the cylinder 44 stops the rotation of the crankshaft when the proximity switch 45 detects that the dog stick 41 has come to the predetermined position.
The dog bar 41 is arranged so as to be in the predetermined position when the dog bar 41 is advanced toward the dog bar 41 and the tips of the first arms 421 are brought into contact with the dog bar 41.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an induction hardening apparatus for a flange portion of a crankshaft.

[0002]

[Prior Art]

 Hereinafter, a conventional technique will be described with reference to the drawings. For example, for a four-cylinder engine, as shown in FIG. 7, a conventional method of quenching a peripheral surface 1 of a flange portion F of a crankshaft W having journals J1 to J5, pins P1 to P4, and a flange portion F is used. The induction hardening device will be described.

A peripheral surface 1 of the flange portion F shown in FIGS. 5 and 6 is a rubber of an oil seal 5 for sealing between a crankshaft W and an engine casing (not shown) in which the crankshaft W is housed. The seal member 6 made of steel slides and wears. However, in order to reduce this wear, the peripheral surface 1 is induction hardened to increase the hardness.

However, the crankshaft W is arranged so as to approach the peripheral surface 1 of the flange portion F while rotating around the rotation axis K (FIG. 7) which is a straight line connecting the centers of the journals J1 to J5. After heating with a high-frequency heating coil (not shown) of a semi-open type (hereinafter, high-frequency heating coil is also simply referred to as a heating coil) that has been installed, when cooling and quenching, the depth of the hardened layer formed on the peripheral surface 1 is reduced. The screw hole 3 formed in the front face 2 of the flange portion F may reach the peripheral surface 3a (FIG. 6) from the peripheral surface 1 of the screw hole 3.

When the flange portion F is connected to a machine or the like driven by the crankshaft W and a screw is inserted into the screw hole 3 for tightening, the screw hole 3 is deformed and cannot be tightened. Or, even if it can be tightened, the peripheral surface 3a on which the hardened layer is formed is fragile and may be chipped.

Therefore, in order to prevent the temperature of the peripheral surface of the screw hole 3 from reaching the quenching temperature during heating of the peripheral surface 1 of the flange portion F by the heating coil, the cooling liquid is injected into the screw hole 3. A cooling liquid ejecting device has been devised.

As shown in FIG. 4, this cooling liquid ejecting apparatus 100 has a rotating body having a substantially short columnar head portion 30A and a shaft portion 30B integrally projecting from the head portion 30A. Part 30 and a part 30B2 of the shaft part 30B on the side opposite to the head part rotatably supported by a pair of tapered roller bearings 11a and 11b, and a tail stock 10 arranged so as to surround the tail stock 10 and a tail stock. It is fixed to the stock 10 and is arranged between the head portion 30A of the rotating portion 30 and the tail stock 10 so as to surround the head side portion 30B1 of the shaft portion 30B with a gap therebetween. And a fixed portion 20 of.

An annular groove 24 is formed on the surface of the fixed portion 20 on the side of the head 30A, and an annular groove 34 is formed on the surface of the fixed portion 20 on the side of the fixed portion 20A. Has been done. That is, the groove 24 and the groove 34 are arranged so as to face each other, and an annular shield plate 25 having a plurality of cooling liquid passage holes 26 is interposed between the groove 24 and the groove 34. ing. Since the connection between the shield plate 25 and the head portion 30A and the connection between the shield plate 25 and the fixed portion 20 are loose, the head portion 30A slides on the shield plate 25 and is fixed to the fixed portion 20. It is freely rotatable and slidable.

A plurality of cooling liquid injection pipes 38 are planted at equal intervals on the front surface 39 of the rotating portion 30 on the side opposite to the fixed portion of the head 30A. A cooling liquid passage 37 is provided for each cooling liquid injection pipe 38 to communicate with the bottom of the groove 34. On the peripheral surface of the fixed portion 20, a coupler 28 to which a cooling liquid supply pipe (not shown) is connected is provided so as to project.

At the center of the front surface 39 of the head portion 30A, a tip portion formed in a substantially conical shape so as to support the center of the front surface 2 of the flange portion F, and a screw 36 are formed on the peripheral surface. A rear end portion of the center 35 having a central portion and a tapered rear end portion is planted. The nut 32 screwed onto the screw 36 is used to pull out the center 35 from the head portion 30A by rotating this nut. Reference numerals 21 and 31 are O-rings that keep the fixed portion 20 and the rotating portion 30 liquid-tight, and 23a and 23b are O-rings that keep the fixed portion 20 and the tailstock 10 liquid-tight. Reference numeral 22 is a hexagon socket head nut for fixing the fixing portion 20 to the tail stock 10.

Reference numeral 12 is a snap ring for providing a gap between the tapered roller bearing 11 b and the oil seal 13. Further, 14 is an O-ring embedded in a sleeve 15 externally fitted to the shaft portion 30B, and 16 is a pair of adapter nuts for tightening the tapered roller bearings 11a and 11b via the sleeve 15.

When the peripheral surface 1 of the flange portion F of the crankshaft W is induction hardened, the rotation axis K of the crankshaft W is arranged horizontally and the head portion 30A of the rotation portion 30 of the cooling liquid injection device 100 is installed. On the front face 39, the cooling liquid injection device 100 is manually arranged so that the cooling liquid injection pipes 38, which are provided in the same number and at the same angular pitch as the screw holes 3 of the flange portion F, face the respective screw holes 3. Then, the coolant injection device 100 is moved in the axial direction of the crankshaft W, and the coolant injection pipe 38 is inserted into the screw hole 3.

Next, when the cooling liquid is supplied to the coupler 28 of the fixed portion 20 while rotating the crankshaft W about the rotation axis K, the supplied cooling liquid is the groove 24 of the fixed portion 20 and the shielding plate 25. The cooling liquid passage hole 26, the groove 34 of the rotating portion 30, the cooling liquid passage 37, and the cooling liquid injection pipe 38 are injected into the screw hole 3. On the other hand, after heating the peripheral surface 1 by applying a high-frequency current for a predetermined time to a heating coil (not shown) which is arranged close to the peripheral surface 1 of the flange portion F, a cooling liquid is supplied from the jacket (not shown) to the peripheral surface 1. Spray to complete quenching of surface 1. Since the cooling liquid is continuously injected from the cooling liquid injection pipe 38 until quenching of the peripheral surface 1 is completed, the peripheral surface 1 has a depth up to the peripheral surface 3a of the screw hole 3. A hardened layer is not formed.

[0014]

[Problems to be solved by the device]

 In quenching the peripheral surface 1 of the flange portion F of the crankshaft W as described above, the cooling liquid injection pipe 38 of the cooling liquid injection device 100 is arranged so as to exactly face the screw hole 3 of the flange portion F. Since it relies on manual work by human eyes, it is extremely troublesome. Further, it is extremely rare that only the flange portion F of the crankshaft W is quenched, and before the flange portion F is quenched, the journals J1 to J5 of the crankshaft W and the pins P1 to P4. Quench. Therefore, around the crankshaft W arranged at the quenching station, a plurality of heating coils and jackets for quenching the journals J1 to J5 and a plurality of heating coils and jackets for quenching the pins P1 to P4 are provided. Also, since the wiring to these heating coils and the piping to the jacket are arranged, it is often difficult for the operator to approach the flange portion F. It has been desired to mechanize the pipe 38 so as to exactly face the screw hole 3 of the flange portion F.

The present invention has been made in view of the above circumstances, and a cooling liquid injection pipe provided on the front surface of the rotation part of a cooling liquid injection device having a rotation part and a fixed part to which the cooling liquid is supplied. It is an object of the present invention to provide an induction hardening apparatus for a flange portion of a crankshaft, which can accurately and mechanically face the screw hole of the flange portion of the crankshaft.

[0016]

[Means for Solving the Problems]

 In order to solve the above problem, the induction hardening device for the flange portion of the crankshaft of the present invention is arranged so as to face the flange portion of the crankshaft in which the position of the pin is fixed. Rotating part, a fixed part to which the rotating part is connected in a liquid-tight, rotatable and slidable manner, and a cooling liquid injection pipe projecting from a surface of the rotating part facing the flange part. And a cooling liquid injection device, the cooling liquid injection pipe is inserted into a screw hole formed in a front surface of the flange portion, and the cooling liquid supplied to the fixing portion is supplied from the cooling liquid injection pipe. In an induction hardening apparatus for a flange portion of a crankshaft, which performs induction hardening of a peripheral surface of the flange portion while injecting into the screw hole and rotating the crankshaft, the rotary portion and the mechanical portion Rotate in synchronism with A linear dog bar, which is arranged so as to be in a predetermined position when the cooling liquid injection pipe is in a position facing the screw hole of the flange portion, and a pair of first dogs which are arranged in parallel with each other. A dog bar stopper provided with an arm and a second arm connecting these first arms, a dog bar stopper advancing / retreating device for advancing / retreating the dog bar stopper in the direction of the dog bar, and the dog bar at substantially the predetermined position. And a detection device for detecting that

After the induction hardening, the dog bar stopper advancing / retreating device stops the rotation of the crank shaft after the detection device detects that the dog bar is almost at the predetermined position. The dog bar stopper is arranged so that the dog bar is in the predetermined position when the dog bar stopper is advanced in the direction of the dog bar and the tips of the first arms are brought into contact with the dog bar. ..

[0018]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 to 3 are drawings for explaining the present embodiment. FIG. 1 is a view for explaining a view taken along the line AA of FIG. 2, FIG. 2 is a front view, and FIG. FIG. The same parts as those described in the related art are designated by the same reference numerals.

As shown in FIG. 2, the crankshaft W is located above the bed 300 by a transfer device (not shown), and between the chuck 61 and the coolant injection device 200, for example, the pins P2 and P3 are at the highest positions. And the axis of rotation K is horizontal.

Reference numeral 62 denotes a chuck control device that controls opening / closing and rotation of the chuck 61, and is connected to an output shaft of a motor 64 via a speed reducer 63. The chuck 61 holding one end of the crankshaft W is rotated by the operation of the motor 64 and can rotate the held crankshaft W about the rotation axis K thereof. The motor 64 is connected to the power source 73 via the switch 71. A brake 65 is provided on the opposite output side of the output shaft of the motor 64, and is connected to the power supply 74 via the switch 72. When operating the motor 64, the switch 72 is closed to excite an electromagnetic coil (not shown) to open the brake.

The lower part of the chuck control device 62 is slidably inserted into a rod 67 bridged between a pair of support members 66 fixed to the upper surface of the bed 300, and is operated by a cylinder 68. The rod (not shown) that moves forward and backward is moved in the direction of the rotation axis K of the crankshaft W.

Since the cooling liquid ejecting apparatus 200 differs from the cooling liquid ejecting apparatus 100 described in FIG. 4 only in the following points, only the different points will be described. That is, as shown in FIGS. 1, 2 and 3, a linear dog bar 41 is provided at the end of the portion 30B2 on the side opposite to the head portion of the shaft portion 30B. The central portion of the dog rod 41 is attached to the end face of the portion 30B2 by means of a hexagon socket head bolt 17. A dog rod stopper 42, a rod 43 fixed to the lower portion of the dog rod stopper 42, and a cylinder 44 (dog rod stopper advancing / retracting device) for advancing / retreating the rod 43 are provided below the dog rod 41. ing. The dog bar stopper 42 includes a pair of first arms 421, 421 arranged in parallel, and a horizontal second arm 422 connecting the ends of the first arms 421, 421. The rod 43 is fixed to the lower center of the second arm 422. Further, the cylinder 44 is attached to the rear portion of the tail stock 10 via a bracket 45.

In addition, in the screw hole 3 of the flange portion F of the crankshaft W 1 in which the pins P2 and P3 are arranged at the highest position, the coolant injection pipe 38 provided on the front surface 39 of the rotating portion 30 is accurately When facing each other, the dog bar 41 is attached to the end face of the portion 30B2 so that the dog bar 41 is at a predetermined position (horizontal position in this embodiment).

Reference numeral 45 denotes a proximity switch as a detection means for the dog rod 41, which is arranged so as to operate when the dog rod 41 reaches a horizontal position. Further, 46 and 47 are proximity switches for detecting that the dog bar stopper 42 has moved up and down, respectively. In addition, 423 is a protrusion provided on the dog bar stopper 42, and the protrusion 423 approaches the proximity switches 46 and 47 to operate the proximity switches 46 and 47.

Next, the operation of this embodiment will be described. First, as described above, the crankshaft W 1 is cooled by the transport device (not shown) while the pins P2 and P3 are at the highest position, and the rotation axis K of the crankshaft W 2 is cooled with the rotation center of the chuck 61. It is arranged horizontally so as to pass through the center of rotation of the liquid ejecting apparatus 200.

At this time, the coolant injection pipe 38 of the coolant injection device 200 does not always exactly face the screw hole 3 of the flange portion F of the crankshaft W. Because, when the quenching of the crankshaft in front of the crankshaft W is completed, the rotation of the crankshaft after the quenching is stopped, and then the crankshaft after the quenching is gripped by the carrying device. After that, the cylinders 53 and 68 are operated to move the cooling liquid ejecting apparatus 200 and the chuck 61 in the directions away from each other, and the support of the crankshaft by the chuck 61 and the center 35 of the cooling liquid ejecting apparatus 200 is removed. From, the crankshaft hardened by the transfer device is carried out.

At this time, the cooling liquid injection pipe 38 of the cooling liquid injection device 200, which has been hardened and separated from the flange portion of the crankshaft by the cylinder 53, is carried in so that the pins P2 and P3 are at the highest position. Generally, it does not face the screw hole 3 of the flange portion F of the next crankshaft W that has been cut.

Therefore, when quenching of the peripheral surface of the flange portion of the crankshaft is completed and the rotation of the crankshaft is stopped, the proximity switch 45 is operated by the dog rod 41 so that the switches 71 and 72 of the motor 64 are switched. Cut. Then, the brake of the motor 64 is activated and the motor 64 is rapidly stopped, so that the crankshaft and the rotating portion 30 of the coolant injection device 200 are also rapidly stopped. Therefore, at this time, the dog bar 41 is stopped in a state in which it is slightly inclined from the horizontal.

Then, the switch 72 is closed to release the brake so that the crankshaft, and thus the rotating portion 30 of the cooling liquid injection device 200 can freely rotate, and then the cylinder 44 is operated to move the rod 43 to the arrow P. When it is lifted in the direction (vertical direction), the tips of the first arms 421, 421 of the dog bar stopper 42 abut the dog bar 41, and the dog bar 41 is fixed in a horizontal state. Next, after grasping the hardened crankshaft by a transfer device (not shown), the cylinders 53 and 68 are operated to move the chuck 61 and the center 35 of the cooling liquid injection device 200 in a direction away from each other and hardened. After releasing the support of the crank 61 of the crankshaft and the center 35, the crankshaft hardened by the carrying device is carried out. After that, the crankshaft W to be subsequently quenched by the transfer device is located between the chuck 61 and the coolant injection device 200, the pins P2 and P3 are at the highest position, and the rotation axis K is The chuck 61 and the coolant injection device 200 are loaded so as to be on the center line.

Then, when the cylinders 53 and 68 are operated to move the cooling liquid ejecting apparatus 200 and the chuck 61 toward each other, the center 35 and the chuck 61 of the cooling liquid ejecting apparatus 200 cause the crankshaft W to move. One end and the other end are supported, and the cooling liquid injection pipe 38 of the cooling liquid injection device 200 is inserted into the screw hole 3 of the flange portion F of the crankshaft W. Next, the cylinder 44 is operated to lower the dog bar stopper 42 in the direction opposite to the arrow P, the switches 71 and 72 are closed, the motor 64 is started, and the crank shaft W and the rotating portion of the cooling liquid injection device 200 are rotated. At the same time as starting the rotation of 30 and heating the peripheral surface 1 of the flange portion F by a heating coil (not shown), the cooling liquid is supplied to the coupler 28 of the fixed portion 20 of the cooling liquid injection device 200 to make a screw hole from the cooling liquid injection pipe 38. Inject within 3 After the quenching of the peripheral surface 1 of the flange portion F is completed, the proximity switch 45 detects the dog rod 41 to turn off the switches 71 and 72 to stop the rotation of the crankshaft W. The brake 65 of the motor 64 is released, the dog bar stopper 42 is raised in the direction of arrow P to fix the dog bar 41 horizontally, and then the crankshaft W is carried out by the carrying device.

By operating the proximity switch 46 by raising the dog bar stopper 42, it can be indicated by a signal light that the cooling liquid injection pipe 38 is accurately facing the screw hole 3 of the flange portion F. .. Further, the proximity switch 47 is operated by the lowering of the dog bar stopper 42, so that it is possible to display a state in which the dog bar stopper 42 is also lowered by a signal light or the like.

In the above-mentioned embodiment, the predetermined position of the dog bar 41 is set to the horizontal position and the dog bar stopper 42 is moved up and down in the vertical direction. However, the predetermined position of the dog bar 41 can be changed from the horizontal position without being particular about this. The position can be inclined at an angle of. At this time, the dog bar stopper 42 is also moved back and forth so as to be orthogonal to the predetermined position.

[0033]

[Effect of the device]

 As described above, according to the present invention, the pin rotates mechanically in synchronism with the rotating portion arranged so as to face the flange portion of the crankshaft in which the position of the pin is fixed. In parallel with the straight dog bar, which is arranged so that the cooling liquid injection pipe planted on the surface of the rotating part facing the flange part is in the specified position when facing the screw hole of the flange part. A dog bar stopper provided with a pair of first arms provided and a second arm connecting these first arms, a dog bar stopper advancing / retracting device for advancing / retracting the dog bar stopper in the direction of the dog bar, and a dog. And a detection device for detecting that the rod is substantially at the predetermined position.

The dog rod stopper advancing / retreating device stops the rotation of the crankshaft when the detecting device detects that the dog rod has almost reached the predetermined position after the high frequency quenching of the flange portion of the crankshaft. Then, when the dog bar stopper is advanced in the direction of the dog bar by the dog bar stopper advancing / retracting device and the tips of the first arms are brought into contact with the dog bar, the dog bar is located at the predetermined position. It is arranged.

Therefore, according to the induction hardening apparatus for the flange portion of the crankshaft of the present invention, it is provided on the front surface of the rotating portion of the cooling liquid injection device having the rotating portion and the fixed portion to which the cooling liquid is supplied. The coolant injection pipe can accurately and mechanically face the screw hole of the flange portion of the crankshaft.

[Brief description of drawings]

FIG. 1 is an explanatory view taken along the line AA of FIG.

FIG. 2 is a front view showing an embodiment of the present invention.

FIG. 3 is a vertical cross-sectional explanatory view of a main part of an embodiment of the present invention.

FIG. 4 is a vertical cross-sectional view of a conventional coolant injection device.

FIG. 5 is a front view of a flange portion of a crankshaft.

6 is an explanatory cross-sectional view taken along the line BB of FIG.

FIG. 7 is a front view of a crankshaft.

[Explanation of symbols]

 1 Circumferential surface 2 Front surface 3 Screw hole 20 Fixed part 30 Rotating part 38 Coolant injection pipe 41 Dog rod 42 Dog rod stopper 421 First arm 422 Second arm 43 Rod 44 Cylinder 45 Proximity switch F Flange P1 to P4 pin W crank shaft

Claims (1)

[Scope of utility model registration request] 1. A rotating portion arranged so as to face a flange portion of a crankshaft in which a pin position is arranged at a fixed position, and the rotating portion is liquid-tight, rotatable and slidable. A cooling liquid injection device provided with a fixed part movably connected to the rotary part and a cooling liquid injection pipe projectingly provided on a surface of the rotary part facing the flange part; The flange is inserted into a screw hole formed in the front of the portion, and the coolant supplied to the fixed portion is injected from the coolant injection pipe into the screw hole while rotating the crankshaft. In an induction hardening apparatus for a flange portion of a crankshaft for induction hardening of a peripheral surface of a portion, the cooling liquid injection pipe is opposed to a screw hole of the flange portion while rotating mechanically in synchronization with the rotating portion. When in position A dog bar stopper provided with a linear dog bar arranged so as to be in a position, a pair of first arms arranged in parallel and a second arm connecting these first arms, and this dog bar stopper A dog bar stopper advancing / retreating device for advancing / retreating a rod stopper in the direction of the dog bar, and a detection device for detecting that the dog bar is at the substantially predetermined position, the dog bar stopper advancing / retracting device is the induction hardening. After that, the rotation of the crankshaft is stopped by the detection device detecting that the dog bar has almost reached the predetermined position, and then the dog bar stopper is advanced in the direction of the dog bar to move the first and second first bars. When the tip of the arm is brought into contact with the dog bar, the dog bar is in the predetermined position,
An induction hardening device for a flange portion of a crankshaft, wherein the induction hardening device is provided.