JPH045227Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a crankshaft phasing device that automatically determines the rotational phase of a crankshaft in the middle of processing.

(Prior Art) Machining of engine crankshafts includes various processing steps, such as measuring the outer diameters of journal parts, pin parts, etc., which are performed independently of the rotational phase of the crankshaft. There are processes that can be performed, and processes that need to be performed at a specific rotational phase of the crankshaft, such as drilling a screw hole into the end of the crankshaft. Therefore, when moving from a phase-independent process to a process that is performed under a specific rotational phase, it is necessary to determine the phase in advance so that the crankshaft, which has an arbitrary rotational phase, will have a constant rotational phase. There is. Conventionally, the phasing of the crankshaft was determined by supporting and lifting a specific pin portion of the crankshaft and positioning the specific pin portion vertically above the journal portion and the unsupported pin portion. . However, with this method, it rarely happens that the unsupported pin part and the journal part are balanced vertically above the supported pin part, that is, lined up in the opposite direction. There was a problem that occurred.
In addition, Japanese Utility Model Application Publication No. 58-55825 discloses that when the journal part of a crankshaft is supported by a pair of conveyor bars and transported horizontally, a specific pin part is lifted by a pair of positioning bars operated by a cylinder and the pin part is moved to the journal part. A device is disclosed in which the crankshaft is rotated upward around the pin portion, and then an attitude changing member is brought into contact with the pin portion to determine the phase of the crankshaft in a horizontal state. However, this device has problems in that it has a complicated structure and is large in size.

(Means for solving the above problem) The present invention is configured to solve the above problem, and the crankshaft phasing device according to the present invention moves the crankshaft on the journal holder to A device for positioning the crankshaft such that the journal portion is located below the specific pin portion by lifting the pin portion by raising the pin holder, the device being pivotally supported by a pivot pin. , by receiving the crankshaft at a predetermined height position, and rotating the crankshaft around the pivot pin while receiving the journal part of the crankshaft in a recess formed at the tip thereof and abutting and supporting the crankshaft. , the journal receiving jig capable of displacing the recessed portion from the receiving position to a support position below the receiving position; the pin cradle for transferring the crankshaft upward to a transport position, while the journal cradle rotates around the pivot pin between the receiving position and the supporting position; , an elastic member that biases the journal holder so that the biasing direction changes with respect to the pivot pin, and an upper abutting surface and a lower abutment surface of the journal holder at the receiving position and the supporting position, respectively. A stop member is provided which restricts the rotation of the journal holder by coming into contact with a contact surface, and the concave portion of the journal holder has three surfaces forming a substantially U-shape. It has a journal receiving part that is made up of two adjacent surfaces and engages with the journal part at the receiving position, and a balance prevention part that is made up of the remaining surface, and the journal part prevents phase balance when the crankshaft is lifted. The journal retainer is rotated until the biasing direction by the elastic member changes, and then the biasing force of the elastic member rotates the journal retainer. The journal receiver is rotated by the biasing force until the lower contact surface of the journal receiver comes into contact with the stopper member, thereby causing the journal receiver to contact the crankshaft. The present invention is characterized in that the abutting position of the journal holder is configured to change during rotation of the journal receiving jig.

(Function) With the above configuration, while the journal support jig supports the crankshaft and rotates, the contact position with the journal portion changes and the biasing direction of the elastic member changes. The rotational speed changes rapidly near the receiving position and the support position, and the movement is stopped by contacting the stopper at each position, thereby imparting a constant impact to the crankshaft.

(Description of Embodiment) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

Referring to FIGS. 1 and 2, the crankshaft 1 of this example is applied to a four-cylinder in-line engine, and includes five journal parts 2, 3, 4,
5 and 6, and four crank pin parts 7, 8, 9 and 10 are formed. Between the first journal part 2 and the first pin part 7, between the second pin part 8 and the third pin part 7,
Balance weights 11, 12, 13 and 14 are provided between the journal part 4, between the third journal part 4 and the third pin part 9, and between the fourth pin part 10 and the fifth journal part 6, respectively. will be provided. Moreover, a flange portion 15 for attaching a flywheel is provided at one end. crankshaft 1
A pair of journal holders 1 are used to support the
6 and 17 are arranged. Journal jig 1
6 and 17 are the second journal part 3 and the fourth journal part 3, respectively.
The journal portion 5 is supported. Since the two journal holders 16 and 17 have the same structure and function, only the journal holder 16 will be explained, and the journal holder 17 will be explained as follows.
Corresponding parts are given the same reference numerals and explanations will be omitted. The journal receiving jig 16 is attached to the support stand 18
It is provided with a pair of rotating curms 21 and 22 which are rotatably attached around pins 19 and 20 provided in the curvature and are arranged opposite to each other. Arm 2
1 and 22 have a U-shaped recess 23 formed at their tips, and arms 21 and 22 are formed on each side of the recess 23.
Abutment member 2 which connects and serves as a journal receiver.
4, 25 and 26 as a balance prevention part are attached respectively. Further, below the recess 23,
Similarly, a pin 27 connecting arms 21 and 22 is attached. Further, a rod 28 is arranged inside the support base 18 substantially parallel to the pin 27. The pin 27 and rod 28 are connected to the coil spring 2.
They are connected by 9. This spring 29 is always in tension, and the magnitude of the tension is:
It reaches its maximum when the pin 27, rod 28, and support pins 19, 20 of the arms 21, 22 are aligned in a straight line. Therefore, when the journal receiving jig 16 is at the rotational position above the above-mentioned equilibrium position in which the journal receiving jig 16 is aligned in a straight line, a clockwise moment acts on the journal receiving jig 16 in FIG. , the moment due to the elastic force of the spring 29 acting on the journal receiving jig 16 becomes zero. and,
When the journal receiving jig rotates below the equilibrium position, a counterclockwise moment acts on it in FIG. 2. That is, the biasing force of the spring 29 against the journal holder 16 is
8 and pins 19, 20 are oppositely oriented before and after the equilibrium position where they are aligned in a straight line. Furthermore, the journal receiving jig 16 has an upper contact surface 30 that contacts the vertical surface 18a of the support base 18 at a predetermined position when rotated upward;
Each has a lower contact surface 31 that comes into contact with the vertical surface 18a at a predetermined position when rotated downward.
That is, the vertical surface 18a of the support base 18 functions as a stopper that restricts the upward and downward rotation of the journal receiving jig 16. Further, a pair of pin holders 32 and 33 are arranged below the crankshaft 1, and V-shaped support parts 32a and 33a are formed at the upper ends of these holders 32 and 33. . The pin holders 32 and 33 each have a support portion 32
a and 33a support the first pin part 7 and the fourth pin part 10 of the crankshaft 1 from below and rise.

(Operation) Crankshaft 1 is operated by arrows A and B in Fig. 3.
As shown in , a high-speed loader passes through two parallel conveyance lines 34 and 35 to stations 36 and 37, respectively. At the stations 36 and 37, the outer diameter of each part is measured and the crankshaft 1 is determined to be transferred. In this case, the second
As shown by the arrow in the figure, the crankshaft 1 is brought into stations 36 and 37 from above by a loader. At this time, as shown by the imaginary line in FIG. 2, the journal receiving jig 16 is in a stationary state with the upper contact surface 30 in contact with the vertical surface 18a, that is, in a stationary state at the receiving position. Then, the loader lowers the crankshaft 1 to the position shown by the imaginary line, and releases the crankshaft 1 at this position. With this, the crankshaft 1
The crankshaft 1 is transferred to the journal receiving jigs 16 and 17, and is supported from below in the journal parts 3 and 5 by the recesses 23 of the receiving jigs 16 and 17. Thereafter, the journal holders 16 and 17 rotate downward due to the weight of the crankshaft 1 against the elastic force of the spring 29 until the lower contact surface 31 contacts the vertical surface 18a of the support base 18. , rotate. And the journal jig 1
6 and 17 are at rest in a state where the lower contact surface 31 is in contact with the vertical surface 18a, that is, in a supporting position (solid line position in FIG. 2).

The crankshaft 1 is a journal jig 1
The outer diameter is measured by the post cage while being supported at the support position by the contact members 24 and 25 of 6 and 17. Thereafter, the crankshaft 1 is lifted upward with the first pin part 7 and the fourth pin part supported from below by the pin holders 32 and 33. When the journal parts 2, 3, 4, 5, and 6 reach the receiving position indicated by the imaginary line above, they are transferred to a loader for transport to the next process. In this case, the crank pin 1 is supported by a first pin part 7 and a fourth pin part 1 supported by pin holders 32 and 33.
The phase is determined with 0 at the highest position. Note that the crankshaft 1 is unstable but balanced with the first pin part 7 and the fourth pin part 10 at the lowest position, and when the pin holders 32 and 33 rise in that state, In this case, the journal parts 2, 3, 4, 5, and 6 will be located above the receiving position shown by the imaginary line, resulting in a mishandling of the crankshaft 1.
However, in this example, when the pin holders 32 and 33 rise, the journal holder 1 follows this up.
6 and 17 are adapted to rotate upward in a state in which they are engaged with the journal parts 3 and 5. In this case, at the rotational position below the equilibrium position of the spring 29, the journal parts 3 and 5 engage with the contact member 26 above the recess of the journal receiver jigs 16 and 17, and the biasing force of the spring 29 However, when the spring 29 passes the equilibrium position, the direction of the biasing force of the spring 29 changes, and the journal retainers 16 and 17 are rotated to lift the journal holder 16 and 17 against the biasing force of the spring 29. Therefore, it rotates independently, and the abutment member 24 on the lower side of the recess 23 abuts against the journal parts 3 and 5, and conversely rotates so as to push up the crankshaft 1.
As the journal support jig discontinuously rotates before and after the equilibrium position, the crankshaft 1 receives a certain amount of impact, and does not create the unstable balance state described above. . Therefore, the crankshaft 1 is always phased in a stable balanced state in which the first pin part 7 and the fourth pin part 10 are in the uppermost position. In this way, the crankshaft 1 is connected to the station 36,
After being phased in step 37, they are again collected in one place by a loader in a circular arc trajectory, brought to a conveyance line 38 for the next process, and then conveyed in the direction of arrow C.

(Effects of the present invention) According to the present invention, when the pin holder moves upward while supporting a specific pin part, a certain impact is applied to the crankshaft by the journal holder, causing the crankshaft to become unbalanced. Because it is becoming possible to
As a result, it is possible to reliably prevent a situation where an unsupported pin section comes above a specific supported pin section, creating an unstable balance state and causing a crankshaft transfer error. Therefore, a reliable positioning device can be obtained. Further, the journal receiving jig according to the present invention has a simple structure and is rational because it not only has a positioning function but also a function as a crankshaft support member when measuring the outer diameter.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a positioning device according to a first embodiment of the present invention, FIG. 2 is a sectional view taken along line AA in FIG. 1, and FIG. 3 is a schematic plan view of a crankshaft processing device. . 1...Crankshaft, 2, 3, 4, 5, 6
...Journal part, 7,8,9,10...Pin part, 16,17...Journal receiving jig, 18...
Support stand, 32, 33...pin holder.

Claims (1)

[Scope of utility model registration request] A device for positioning a crankshaft on a journal holder by lifting a specific pin part of the crankshaft by lifting a pin holder, and positioning the crankshaft so that the journal part is positioned below with respect to the specific pin part. It is pivotally supported by a pivot pin,
By receiving the crankshaft at a predetermined height position, and rotating the crankshaft around the pivot pin while receiving the journal part of the crankshaft in a recess formed at the tip thereof and abutting and supporting the crankshaft, the journal support jig capable of displacing the recessed portion from the receiving position to a support position below the receiving position; and the crankshaft being moved from the supporting position to the receiving position while supporting the specific pin portion of the crankshaft. while the pin holder and the journal holder rotate between the receiving position and the supporting position around the pivot pin, an elastic member that biases the journal holder so that the biasing direction changes with respect to the pivot pin; and an upper abutting surface and a lower abutment surface of the journal holder at the receiving position and the supporting position, respectively. A stopper member that restricts rotation of the journal holder by coming into contact with a surface,
The recessed portion of the journal receiving jig has three surfaces forming a substantially U-shape, and a journal receiving portion that is made up of two adjacent surfaces and engages with the journal portion at the receiving position, and a journal receiving portion that engages with the journal portion at the receiving position; When the crankshaft is lifted, the journal part engages with the phase balance prevention part to bias the journal support jig, and the biasing direction by the elastic member changes. Then, the biasing force of the elastic member rotates the journal retainer to bring the journal receiver into contact with the crankshaft, and then the bias force causes the journal retainer to rotate. The lower contact surface of the journal is rotated until it comes into contact with a stopper member, so that the contact position of the journal part in the concave part changes during rotation of the journal receiving jig. Characteristic crankshaft phasing device.