JPH0572339U - Crankshaft mounting jig for automatic unbalance correction device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a crankshaft mounting jig that can automatically hold and index multiple types of crankshafts with different journal diameters, pin diameters, and strokes in a crankshaft imbalance correction device. To do. A pair of centers that support a crankshaft from both sides, a rotary indexing mechanism that performs a rotary indexing of the crankshaft with the center as a center of rotation, and a swivel plate that is rotated by the rotary indexing mechanism. A pin clamp mechanism configured to open and close in synchronization with a pair of clamp arms sandwiching a crankpin of the crankshaft, and which is attached to the swivel plate such that a center line of the pair of clamp arms passes through a center of the center. And a natural clamp that supports the journal of the crankshaft, and a main clamp that presses the journal against the natural clamp.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a crankshaft mounting jig for holding and cranking a crankshaft when an imbalance is corrected in an automatic crankshaft imbalance correction device.

[0002]

[Prior Art]

 In a multi-cylinder engine, the connecting position of the connecting rod with respect to the crankshaft is shifted so that the piston and the inertial force of the connecting rod due to the rotation of the crankshaft cancel each other out during engine operation to suppress engine vibration. However, this is not enough, and the crankshaft itself has a balance weight on the crank arm to counteract the inertial force of the piston and connecting rod.

The balance weight is designed according to the piston or the cylinder connected to the crankshaft, but it may cause imbalance (residual imbalance) due to processing error or the like. For this reason, the crankshaft is measured for imbalance after being machined a predetermined amount by an imbalance measuring device, and the presence or absence of residual imbalance and the correction amount are required. And for the crankshaft that needs to be modified, holes are drilled in the balance weight to modify it.

As shown in FIGS. 7 and 8, the above-described processing involves clamping the journal (2) of the crankshaft (1) with the main clamp (5) and positioning the crankpin (3) from the side. The balance weight (4) of the crankshaft (1) is punched with the drill (7) by pressing it against the metal fitting (6) for positioning.

[0005]

[Problems to be solved by the device]

 Even for the same type of engine, various types of engines such as normal type and high output type with supercharger are made, and the crankshaft (1) also has the same diameter as the journal (2) and crank pin (3). ), The stroke from the journal center to the pin center (pin stroke), and so on.

As described above, when different types of crankshafts are machined, in order to position the crankshaft (1) so that the posture of the crankshaft is always constant, the main clamp (5) has a receiving plate (8). ) Are prepared according to the diameter of the journal (2), and the mounting position of the positioning bracket (6) is changed according to the diameter of the crank pin (3) and the pin stroke.

When the type of the crankshaft (1) changes, the operator replaces the receiving plate (8) and moves the position of the positioning fitting (6) accordingly. Therefore, workability was poor, and productivity was low when the type of crankshaft changed frequently.

The present invention is intended to provide a mounting jig that can be automatically clamped to maintain its posture constant even if the type of crankshaft changes.

[0009]

[Means for Solving the Problems]

 This invention proposes a pair of centers that support the crankshaft from both sides, a rotary indexing mechanism that rotates and indexes the crankshaft with the center as the center of rotation, and a swivel that is rotated by the rotary indexing mechanism. The plate and the pair of clamp arms sandwiching the crankpin of the crankshaft are configured to be opened and closed in synchronization with each other, and attached to the swivel plate so that the center lines of the pair of clamp arms pass through the center of the center. It is composed of a pin clamp mechanism, a natural clamp that supports the journal of the crankshaft, and a main clamp that presses the journal against the natural clamp.

[0010]

With the above-described mounting jig, the crankshaft is supported by the pair of centers from both sides, and the journal of the crankshaft is centered. After centering, one of the crankshaft's crankpins is clamped with a pin clamp, and then the swivel plate and center are rotated by the rotary indexing mechanism to index the crankshaft.

When indexing is completed, the journal of the crankshaft is supported by the natural clamp, and then the journal is pressed and fixed by the main clamp. In this condition, the crankshaft balance weight is drilled.

As described above, since the journal of the crankshaft and the crankpin are centered and indexed by the pair of center and pin clamps, and then the journal is clamped, the journal diameter, the crankpin diameter, and the pin Even if the stroke is changed, the posture of the crankshaft can be kept constant without any adjustment or replacement of parts.

[0013]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 1 and FIG. 2, the crankshaft mounting jig includes a pair of centers (10) and (11) for supporting the crankshaft (1) from both sides and a rotation for indexing and rotating the crankshaft. The indexing mechanism (12), the swivel plate (13) that rotates integrally with the center (10), the pin clamp (14) that clamps the crank pin (3) of the crankshaft (1), and the crankshaft (1). It is composed of a natural clamp (15) that supports the journal (2) and a main clamp (16) that presses the journal (2) against the natural clamp (15).

One center (hereinafter referred to as the first center) (10) is slidable on a first center box (22) rotatably supported by a first support frame (20) via a bearing (21). Supported by. A first piston (23) is provided at the first center (10) and is slid by a first clamp cylinder (24) formed in a first center box (22). Further, the shift cylinder (25) is installed outside the first clamp cylinder (24) in the first center box (22), and the piston (26) of the shift cylinder (25) slides to move the first center (10). ) Can be shifted.

The other center (hereinafter referred to as the second center) (11) is slidable in a second center box (32) rotatably supported by a second support frame (30) via a bearing (31). Supported by. A second piston (33) is provided on the second center (11) and is slid by a second clamp cylinder (34) formed on a second center box (32).

The rotary indexing mechanism (12) mounts an indexing servomotor (35) on the first support frame (20) and rotates the output shaft (36) of the servomotor (35) by a gear mechanism (37). ), The first center box (22) is rotated, and the swivel plate (13) is rotated via the first center box (22).

Further, the swivel plate (13) is provided with a temporary receiving base (41) for temporarily receiving the flange (40) at the end of the crankshaft (1). Further, a temporary receiving stand (43) for temporarily receiving the end portion (42) of the crankshaft (1) is also mounted on the upper surface of the second support frame (30) via a bracket (44). .

As shown in FIGS. 3 to 5, the pink lamp (14) has a support block (45) attached to the lower vertical wall of the swiveling plate (13), and a pair of pivot shafts ( 46 and 47 are rotatably attached, the ends of the pivot shafts 46 and 47 are projected from the support block 45, and the clamp arms 50 and 51 are attached to the protruding ends. Pinions (52) (53) are formed on the pivot shafts (46) (47) and are engaged with a rack (54) slidably interposed between the pinions (52) (53). The rack (54) has pistons (55) and (56) attached to both ends, and is slid by a clamp cylinder (57) formed in a support block (45). The clamp arms (50) (51) are formed such that the gripping parts (50a) (51a) have a thickness that fits between the crank arms sandwiching the pin part (3) of the crankshaft (1) and have a certain length. is there. Moreover, the clamp arms (50) and (51) are arranged so that the center line between them passes through the center of the first center (10).

The pin clamp (14) rotates the pinion shafts (46) (47) via the pinions (52) (53) by sliding the rack (54) with the clamp cylinder (57). The clamp arms (50) (51) attached to the pinion shafts (46) (47) are opened and closed.

The natural clamp (15) supporting the journal (2) of the crankshaft (1) is installed between the first support frame (20) and the second support frame (30) as shown in FIG. The backup rod (61) is slidably supported through the fixed block (60), and the reference block (62) that supports the journal (2) of the crankshaft (1) is attached to the upper end of the backup rod (61). There is. A wedge rod (63) is slidably attached to the fixed block (60) in parallel with the backup rod (61), and an extruding plate (64) attached to the rear end of the wedge rod (63) is attached to the backup rod (61). The rear end portion is slidably penetrated, and a spring (66) is interposed between the step portion (65) of the backup rod (61) and the pushing plate (64) while being compressed.

A fixed rod (67) is slidably provided in the support block (60) so as to intersect with the backup rod (61), and a taper surface (70) of the fixed rod (67) is provided around the backup rod (61). It is inserted in the taper groove (71) formed in the surface, and the taper portion (73) of the wedge rod (63) is inserted in the through hole (72) formed in the intermediate portion of the fixed rod (67). The taper surface (70) of the fixing rod (67) is inclined so that the backup rod (61) is not retracted, and the taper portion (73) of the wedge rod (63) backs up the fixing rod (67). It is inclined so that it is pressed against the cord (61). The taper groove (71) of the backup rod (61) is formed longer than the thickness of the fixed rod (67), and the through hole (72) of the fixed rod (67) is longer than the thickness of the wedge rod (63). Has been formed. Further, a back-up spring (74) is interposed between the fixed rod (67) and the fixed block (60) so that the fixed rod (67) is constantly pressed against the wedge rod (63).

The natural clamp (15) is configured such that the wedge rod (63) is slid by the backup cylinder (75) formed in the fixed block (60), and when the wedge rod (63) is advanced. The pusher plate (64) advances the backup rod (61) through the spring (66). On the other hand, when the wedge rod (63) moves forward, the fixed rod (67) is pushed by the tapered portion (73) of the wedge rod (63) and moves to the backup rod (61) side. The forward movement of the backup rod (61) and the movement of the fixed rod (67) are performed at the same time, and before the tapered surface (70) of the fixed rod (67) comes into contact with the tapered groove (71) of the backup rod (61), the reference A block (62) is arranged to contact the journal (2) of the crankshaft (1).

When the reference block (62) comes into contact with the journal (2) of the crankshaft (1), the backup rod (61) stops, but the wedge rod (63) continues to move forward and its tapered portion (73). ) Pushes up the fixed rod (67), and its tapered surface (70) contacts the tapered groove (71) of the backup rod (61) and stops. When the backup rod (61) is stopped, the fixed rod (67) and the wedge rod (63) are also stopped. Therefore, the reference block (62) does not move by pushing the journal (2). Further, even if the reference block (62) is pressed in the fixed state, the wedge action of the fixed rod (67) and the wedge rod (63) prevents the backup rod (61) from retreating, thus preventing the positional displacement. . The reference block (62) is formed so as to support a predetermined journal according to the processing conditions.

The main clamp (16) is arranged on the opposite side of the natural clamp (15) with the crankshaft (1) sandwiched therebetween, and the central portion of the presser arm (77) can be swung on the support bracket (76). The clamp arm (77) is oscillated by the main clamp cylinder (81) via the intermediate rod (80). The holding arm (77) has an elongated hole (83) formed at the end (82), and the elongated hole (83) is engaged with a connecting pin (84) provided at the tip of the intermediate rod (80). The rocking motion is not disturbed. Further, the holding portion (85) of the holding arm (77) is arranged so as to face the journal (2) supported by the reference block (62) of the natural clamp (15) so as to face the holding arm (77). The journal (2) of the crankshaft (1) is pressed against the reference block (62) of the natural clamp (15).

When mounting the crankshaft, the first center (10) and the second center (11) are separated from each other, and the clamp arms (50) (51) of the pin clamp (14) are opened. Then, when the crankshaft (1) held in advance at a predetermined angle is placed on the temporary receiving bases (41) (43), the first center (10) and the second center (11) are brought close to each other, The crankshaft (1) is supported from both sides and the journal (2) of the crankshaft (1) is centered. Next, the clamp arms (50) (51) of the pin clamp (14) are closed to hold the crank pin (3), and the held crank pin (3) is centered. After that, the servo motor (35) of the rotary indexing mechanism (12) operates to rotate the turning plate (13) and index the crankshaft (1).

After indexing, the backup cylinder (75) of the natural clamp (15) is operated to project the backup rod (61), and the reference block (62) is brought into contact with the journal (2) of the crankshaft (1). Then, the main clamp cylinder (81) of the main clamp (16) is operated to move the intermediate rod (80) forward to swing the holding arm (77), and the holding arm (77) clamps. Hold the journal (2) of the rank shaft (1), and firmly clamp the crankshaft (1) with the reference block (62) and the holding arm (77).

When the clamp is completed, a predetermined balance weight of the crankshaft (1) is perforated to correct the imbalance. Once processing is completed, the main clamp cylinder (81) retracts the intermediate rod (80) to release the holding arm (77) of the main clamp (16), and the backup cylinder (75) allows the wedge rod (63) to move. Is retracted, the reference block (62) of the natural clamp (15) is also released via the push-out plate (64), and the crankshaft (1) is released. In this state, the servo motor (35) of the rotary indexing mechanism (12) is operated again to rotate the turning plate (13) and index the crankshaft (1) to the next machining position.

After the indexing, the reference block (62) of the natural clamp (15) and the holding arm (77) of the main clamp (16) are pressed against the journal (2) of the crankshaft (1) again, and the crankshaft (1) is pressed. ) Is clamped and the imbalance is corrected.

When all the modifications to the crankshaft (1) are completed by repeating the above operation, the clamps by the main clamp (16), the natural clamp (15) and the pin clamp (14) are released, and then the first center is released. (10) and the second center (11) are separated from each other, the crankshaft (1) is released, placed on the temporary receiving bases (41) and (43), and carried out.

In the above mounting jig, since the center of the journal (2) of the crankshaft (1) and the center of the crank pin (3) are used as a reference for clamping and indexing, the crankshaft (1) crank Even if the pin diameter of the pin (3) or the diameter of the journal (2) changes, it can be gripped without any problem.

[0032]

[Effect of the device]

 According to this invention, the crankshaft is automatically centered and indexed and then held, so that imbalance correction can be automated, and the crankshaft pin diameter, journal diameter, and pin stroke differ. However, it can be maintained without any problems, and workability and productivity are greatly improved.

[Brief description of drawings]

FIG. 1 is a schematic view showing the structure of a mounting jig according to the present invention.

FIG. 2 is a front view showing the entire structure of a mounting jig according to the present invention.

FIG. 3 is a side view showing the pin clamp of the present invention.

FIG. 4 is a sectional view taken along the line AA in FIG.

5 is a sectional view taken along line BB in FIG.

FIG. 6 is a sectional view showing a natural clamp and a main clamp of the present invention.

FIG. 7 is a partial sectional side view showing a conventional imbalance correction.

FIG. 8 is a front view of a main part showing a conventional imbalance correction.

[Explanation of symbols]

 1 Crankshaft 2 Journal 3 Crank Pin 10 Center 11 Center 12 Rotation Indexing Mechanism 13 Swivel Plate 14 Pink Lamp 15 Natural Clamp 16 Main Clamp

Claims (1)

[Scope of utility model registration request] 1. A pair of centers for supporting a crankshaft from both sides, a rotary indexing mechanism for rotating and indexing the crankshaft with the center as a center of rotation, and a swivel rotated by the rotary indexing mechanism. The plate and a pair of clamp arms sandwiching the crankpin of the crankshaft are configured to be opened and closed in synchronization with each other, and the center line of the pair of clamp arms is attached to the swivel plate so as to pass through the center of the center. A crankshaft mounting jig for an unbalance automatic correction device, comprising a pink ramp mechanism, a natural clamp that supports the journal of the crankshaft, and a main clamp that presses the journal against the natural clamp.