JP5231329B2 - Support method and apparatus for machining camshaft - Google Patents

Description

  The present invention relates to a support method and apparatus for processing a camshaft, and more particularly, to process a camshaft for processing tap holes, key grooves, and the like on a camshaft incorporated in an internal combustion engine. The present invention relates to a support method and an apparatus therefor.

  The shaft portion and the shaft end portion of the camshaft incorporated in the internal combustion engine are subjected to processing such as suspending a timing belt or providing a hole for supplying lubricating oil. When machining such holes, tap holes, keyways, etc., it is necessary to horizontally support a camshaft that is long in the axial direction. For this reason, an apparatus for accurately positioning the camshaft has been proposed by positioning the camshaft axis, positioning in the axial direction, and positioning around the axis.

  For example, Patent Document 1 discloses an invention “camshaft material support device”. According to this invention, positioning of the shaft core of the camshaft is performed by a V-shaped block of the cylindrical portion of the camshaft. Positioning in the axial direction is performed by abutting one end of the camshaft against the wall or the like, and positioning around the axis is performed by forming a positioning projection in advance when forming the camshaft material, and during drilling or other processing. It is configured to regulate using the protrusion.

Japanese Patent No. 3828735

  However, in recent years, the number of valves provided for each cylinder of the engine has increased, and it has become difficult to provide positioning protrusions on the shaft of the camshaft. The position and angle of the cam shape that can be positioned may not match. Furthermore, when trying to reduce the weight of the camshaft itself for the purpose of improving fuel consumption, the weight of the protrusion cannot be ignored. Furthermore, when the protrusions are provided, the position and shape vary depending on the type of camshaft, so the manufacturing process becomes complicated, such as the need for a positioning jig for each type of product, and the product cost. This increases the machining time and increases the machining time.

  The present invention has been made in consideration of the above-described problems, and can easily position a camshaft during processing without providing a positioning projection for processing on a material constituting the camshaft. It is an object of the present invention to provide a support method and an apparatus for processing a shaft.

To achieve the above object, the present onset Ming, a support method for processing a cam shaft having an end portion at least mutually parallel sides, a step of placing the cam shaft in the axial support section A step of pressing the camshaft from one end side thereof to position the camshaft on the abutting reference portion; a step of regulating the phase of the camshaft by gripping parallel sides of the camshaft; and the cam And a step of pressing the shaft to fix the camshaft.

According to the present invention, when processing different types of camshafts such as tapped holes and keyways, positioning of the shaft core, the length direction, and the axis is easily performed. In addition, there is a simple and low manufacturing cost.

Further, the present invention is characterized by comprising the step of determining the correctness of the positioning of the cam shaft before the step of regulating the position of the mosquito Mushafuto.

According to the present invention, it is possible to determine whether or not the camshaft is positioned correctly before processing, thereby producing an effect that the camshaft can be processed with high yield and efficiency.

Furthermore, the present invention provides a supporting apparatus for processing a cam shaft having an end portion at least mutually parallel sides, a plurality of rotatably supporting lifting unit provided on the table, placing the shaft supporting lifting unit and abutting the reference section one end of the location has been camshaft abutment, the actuator abutting the cam shaft impact this standard unit, a phase regulating portion for holding the parallel sides of the mosquito Mushafuto, journalled lifting And a pressing portion that presses and fixes the camshaft held by the portion.

According to the present invention, the cam shaft is positioned in the axial direction by the abutting reference portion and the cam phase of the cam shaft is restricted by the phase restricting portion, so that positioning of the entire cam shaft is facilitated. The processing can be performed as easily as possible. Moreover, since it is versatile, there is an advantage that it can be applied to different types of camshafts.

Furthermore, the present invention is supported lifting device is characterized in that it comprises a positioning determination unit that conforms to the cam shape of the cam shaft determines the correctness of the processing position of the cam shaft.

According to the present invention, since it is possible to determine whether or not the machining position is correctly secured before the camshaft is processed by the positioning determination unit, it is possible to obtain an effect that the camshaft is processed with high yield and efficiency.

Furthermore, the present invention is, press pressure portion is characterized in that it comprises a freely camshaft abutment rotation.

According to the present invention, since the camshaft abutting portion is rotatable, even if the camshaft is of a different type, the camshaft is pressed and positioned at an optimum position according to the type of the camshaft. It is possible to provide.

  According to the supporting method and apparatus for processing a camshaft according to the present invention, the axial position of the camshaft is fixed by the abutting reference portion, and the camshaft is clamped by holding parallel sides of the camshaft. In addition, by determining the camshaft positioning, it is possible to determine whether the camshaft is positioned in the circumferential direction. Therefore, according to the present invention, when the camshaft is processed, the camshaft material is not provided with a positioning projection for processing, and therefore, it is easy to position even for various types of camshafts. Can also be shortened.

FIG. 1 is a partially cutaway sectional view in the longitudinal direction of a camshaft machining support device according to an embodiment of the present invention. FIG. 2 is a partial cross-sectional plan view of FIG. 3 is a partial cross-sectional view taken along line III-III in FIG. FIG. 4 is a partial cross-sectional view taken along line IV-IV in FIG. FIG. 5 is a partial cross-sectional view taken along line VV in FIG. FIG. 6 is a partially longitudinal explanatory view of a camshaft machining support device according to another embodiment of the present invention.

  Hereinafter, a support method for processing a camshaft according to the present invention will be described in detail with reference to the accompanying drawings by giving preferred embodiments in relation to an apparatus for carrying out the support.

  First, the present invention focuses on the shape of a camshaft for converting the reciprocating motion of a piston into a rotational motion.

  As shown in FIG. 1, the camshaft is provided with cams that are spaced apart from each other by a predetermined interval and have different rotational phases in order to open and close the intake valve and the exhaust valve with a time difference according to the number of cylinders constituting the internal combustion engine. Adopt the structure. That is, in FIG. 1, reference numeral 10 indicates a camshaft. The camshaft 10 has cams 12 spaced apart from each other by a predetermined distance, and these cams 12 have egg-shaped projections that are out of phase with each other. They are arranged in a state of being spaced apart at equal intervals. A cam journal 14 is provided between the plurality of cams 12. One end of the camshaft 10 has surfaces 16a and 16b parallel to each other as shown in the cross-sectional view of FIG. These parallel surfaces 16a and 16b are conventionally provided in order to position the camshaft using a spanner or the like, or to perform processing or the like. The inventor of the present application contacts a shaft positioning member (to be described later) with the parallel surfaces 16a and 16b to fix the camshaft 10, and then, for example, processes a tap hole for supplying lubricating oil. In order to suspend the timing belt, the camshaft 10 is intended to be used as a fixing mechanism when a keyway is cut.

  Therefore, a camshaft machining support device 20 for fixing and supporting a tapped hole or a keyway in the camshaft 10 will be described below.

  As shown in FIGS. 1 and 2, the camshaft processing support device 20 has a base 22 that is held horizontally, and a plurality of legs 24 are erected on the base 22. The legs 24 hold the table 26 in the horizontal direction. At one end of the table 26, there is provided a fluid supply / discharge passage 28 for supplying and discharging a pressure fluid to an actuator, that is, a cylinder described later. A pin receiving portion 30 for inserting a pin is provided at the other end portion of the table 26 so as to fix an abutting reference portion to which the other end portion of the camshaft 10 is pressed and fixed, as will be described later. As described above, the abutting reference portion 32 is provided corresponding to the pin receiving portion 30. The abutting reference portion 32 has a cylinder 34 therein, and the cylinder rod 36 of the cylinder 34 moves forward relative to the pin receiving portion 30 to position the abutting reference portion 32 on the table 26.

  Actually, the abutting reference portion 32 has an abutting portion 38 protruding on one side surface, and the abutting portion 38 abuts against the other end portion of the camshaft 10 which is a workpiece, and the camshaft 10 is brought into its Position in the axial direction. In the vicinity of the abutting reference portion 32, a phase restricting portion 40 that restricts the phase around the axis of the camshaft 10 is provided.

  As easily understood from FIG. 2, the phase restricting portion 40 includes mounting members 42 a and 42 b so as to face each other on the table 26 with the camshaft 10 interposed therebetween, and the mounting members 42 a and 42 b include Pushing members 44a and 44b are provided.

  The pressing members 44a and 44b have plungers 48a and 48b that come into contact with the mutually parallel surfaces 16a and 16b of the camshaft 10, which is a workpiece, by the coil springs 46a and 46b, respectively. , 46b and the elastic force of 46b, the screws 50a, 50b are always pressed toward the camshaft 10 side. Therefore, it can be easily understood that if the screws 50a and 50b are adjusted under the screw action, the amount of protrusion of the plungers 48a and 48b onto the camshaft 10 and the pressing force thereof are adjusted.

  A shaft support 60 is provided at a predetermined distance from the mounting members 42a and 42b. As shown in FIG. 4, the shaft support portion 60 has a mounting block 61, and the mounting block 61 is fixed on the table 26 via a bolt or the like (not shown). The mounting block 61 has a work holding portion 64 formed by inclined surfaces 62a and 62b that expand at 90 ° relative to each other at the upper portion thereof. As a result of having the inclined surfaces 62a and 62b as described above, it is possible to hold the camshaft 10 having different diameters, and if the height of the workpiece holding portion 64 is adjustable, a wider variety of camshafts. 10 can be accommodated.

On the other hand, a pressing portion 70 is provided on the table 26 between the shaft support portion 60 and a positioning determination portion 90 described later . As shown in FIG. 4, the pressing portion 70 has a support 72, and a support shaft 74 is provided at the tip of the support 72. The support shaft 74 holds the arm 76 rotatably. An abutting member 78 is provided at one end of the arm 76, and a cylinder rod 80 that moves forward and backward by a cylinder (not shown) is engaged with the other end of the arm 76 on the opposite side of the abutting member 78. . The cylinder rod 80 is actually connected to the arm 76 by a pin 82 provided on the arm 76. Therefore, it will be understood that when the cylinder rod 80 is displaced in the vertical direction indicated by the arrow X in FIG. 4, the arm 76 swings as indicated by a solid line or a two-dot chain line. When the cylinder rod 80 moves up as indicated by the arrow X, the contact member 78 at the tip of the arm 76 presses the cam surface of one cam 12 of the camshaft 10, and the inclined surface 62 a of the work holding portion 64. The camshaft 10 is firmly positioned and held at 62b.

  As can be understood from FIG. 2, the support column 72 can rotate around its axis indicated by the arrow Y. Accordingly, the contact member 78 of the arm 76 can be brought into contact with the cam 12 at a desired position of the camshaft 10 by rotating the support column 72. This also makes it possible to deal with various types of camshafts 10.

A positioning determination unit 90 is disposed on the table 26 in proximity to the pressing unit 70. The positioning discriminating unit 90 is provided so that the camshaft 10, which is a workpiece, is not misplaced in the workpiece holding unit 64 or the like. Specifically, as shown in FIG. 5, the positioning determination unit 90 has a mounting portion 92, and a curved recess 94 is formed on the upper surface of the mounting portion 92. The shape of the concave portion 94 is a shape corresponding to the side curved surface of the cam 12 constituting the camshaft 10 that is a workpiece. The positioning determination unit 90 is configured with attention paid to the shape of the camshaft 10 that is a workpiece. As is well known, the cams 12 provided on the camshaft 10 are out of phase with each other. Therefore, the height H ₂ showing the height H ₁ and the broken line of the protrusion of the cam 12 shown by the solid line in FIG. 5 when focusing on a particular cam 12 is different heights. Therefore, if the heights are different, it is possible to easily determine whether or not the mounting position of the camshaft 10 is correct.

  Next, as easily understood from FIG. 1, a cylinder 100 as an actuator is provided on one end portion side of the table 26. The cylinder 100 includes a piston 102 that reciprocates therein, a piston rod 104 that is fixed to the piston 102 and exposed to the outside, and a fluid supply / discharge port 108 that communicates with a chamber 106 formed in the cylinder 100. A fluid supply / discharge passage 28 provided in the table 26 communicates with the chamber 106 on the opposite side of the fluid supply / discharge port 108.

  On the other hand, a support column 110 that is bent on the front end side of the piston rod 104 and on the table 26 is provided. An arm 112 is provided at the upper end of the support 110, and a pin 114 is implanted at the tip of the arm 112. The pin 114 holds the swing arm 116 at substantially the center thereof, and a pin 118 attached to the tip of the piston rod 104 is engaged with the lower end of the swing arm 116 so as to be relatively rotatable. Therefore, when the piston 102 of the cylinder 100 reciprocates, the piston rod 104 moves forward and backward, and the pin 114 swings the swing arm 116 as indicated by the arrow Z. The upper end of the swing arm 116 faces one end of the camshaft 10.

  A shaft support portion 130 is provided on the table 26 in the vicinity of the column 110. The shaft support portion 130 has a work holding portion 132 having inclined surfaces that expand each other by 90 °, like the shaft support portion 60. A pressing portion 140 is provided in the vicinity of the shaft support portion 130 and has the same configuration as the pressing portion 70. Since the pressing unit 140 adopts the same configuration as the pressing unit 70, detailed description thereof is omitted.

  The camshaft machining support device 20 according to the present embodiment is basically configured as described above. Next, the operation and effects thereof will be described.

First, in the cylinder 100, pressure fluid is introduced from the fluid supply / discharge port 108, the piston 102 is pressed, and the piston rod 104 is advanced. As a result, the swing arm 116 is rotated in the direction of the arrow Z ₁ . On the other hand, the pressing portion 70, the cylinder rod 80 is retreat operated to urge the cylinder (not shown), is rotated in the arrow M ₁ direction as shown the arm 76 by the two-dot chain line. Similarly, the arm is also opened in the pressing portion 140.

  After such a preparation stage, the camshaft 10 is placed on the workpiece holding portion 64, the placement portion 92, and the workpiece holding portion 132. At this time, when the egg-shaped curved lower surface of the cam 12 of the camshaft 10 set on the mounting portion 92 does not align with the concave portion 94, the positioning discriminating unit 90 naturally mounts the camshaft 10 by the operator. It is confirmed that the installation state is not normal. Therefore, the camshaft 10 is rotated by the operator, and the cam 12 is placed again so that the curved surface of the cam 12 matches the curved surface of the recess 94. Thus, the camshaft 10 is positioned so as to ensure a height suitable for processing. At this time, if a sensor is arranged on the mounting portion 92 and a signal is derived when the curved surface of the cam 12 constituting the camshaft 10 and the curved surface of the concave portion 94 coincide, The operation can be easily continued without visually confirming the normal mounting state of the camshaft 10.

Therefore, when the camshaft 10 is disposed at a normal position, the pressure fluid is introduced from the fluid supply / discharge passage 28 into the cylinder 100, and the piston 102 moves backward. This piston rod 104 is degraded, and swings in the arrow Z ₂ direction swing arm 116 of pin 114 as a fulcrum, the leading end portion of the swing arm 116 pushes the cam shaft 10 at its one end. The camshaft 10 thus pressed comes into contact with the abutting portion 38 of the abutting reference portion 32 and enters the abutted positioning state. This is the reference position.

Accordingly, the pressing portion 70 and the pressing portion 140 are energized, and the cylinder rod 80 moves forward to rotate in the direction of the arrow M ₂ from the state indicated by the two-dot chain line in FIG. It works. Thereby, the contact member 78 presses the cam 12 of the camshaft 10. As a result, the camshaft 10 is firmly held by the work holding portion 64 using the inclined surfaces 62a and 62b. A similar operation is performed on the pressing portion 140 side.

  Thereafter, a hole for supplying lubricating oil is drilled in the camshaft 10 from a direction perpendicular to the axis of the camshaft 10 with a drill (not shown).

The camshaft 10 that has been drilled is first disengaged from the camshaft 10 that is the workpiece by the pressing portions 70 and 140, and the cylinder 100 is further energized, so that the pressure fluid is supplied from the fluid supply / discharge port 108. When the piston rod 104 is supplied, the swing arm 116 is rotated in the direction of the arrow Z ₁ to release the engagement from the end of the camshaft 10. As a result, the camshaft 10 in a free state is sent to the next work process.

  FIG. 6 shows another embodiment of the camshaft machining support device 20 according to the present invention. The same components as those of the camshaft machining support device 20 shown in FIGS. 1 to 5 are denoted by the same reference numerals, and detailed description thereof is omitted.

In the first embodiment, the phase restricting portion 40 is provided with mounting members 42a and 42b, coil springs 46a and 46b, plungers 48a and 48b so as to sandwich the parallel surfaces 16a and 16b from both sides of the camshaft 10 as a workpiece. Are provided so as to face each other. However, in the second embodiment, the mounting member 42a, the coil spring 46a, and the plunger 48a are omitted, and instead of this, a fixed reference fixing portion 200 is provided on the table 26. The reference fixing portion 200 includes a metal block 202 bent in a substantially L shape, and holds the parallel surface 16a and the bottom surface of the camshaft 10 by its vertical side surface 204 and horizontal side surface 206, The screw 50b on the side of the mounting member 42b is screwed and the other surface 16b which is parallel to the camshaft 10 is strongly pressed by the plunger 48b. As a result, the surface 16 a of the camshaft 10 is pressed against the side surface 204 of the block 202, and the bottom surface of the camshaft 10 is held by the side surface 206.

  Therefore, the reference fixing unit 200 according to the second embodiment has an advantage that the structure is further simplified and the manufacturing cost can be reduced as compared with the phase restricting unit 40 in the first embodiment.

  As described above, the supporting method for processing the camshaft according to the present invention has been described with reference to preferred embodiments in relation to the apparatus therefor, but the present invention is not limited to these embodiments. Needless to say, various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Cam shaft 12 ... Cam 16a, 16b ... Parallel surface 20 ... Camshaft processing support device 26 ... Table 32 ... Abutting reference | standard part 38 ... Abutting part 40 ... Phase control part 60 ... Shaft support part 70 ... Press part 90 ... Positioning determination unit 100 ... Cylinder 104 ... Piston rod 116 ... Swing arm 200 ... Reference fixing unit 202 ... Block

Claims (9)

A supporting method for processing a camshaft cam shifting the plurality of phase and have at least mutually parallel sides end along the longitudinal direction is provided,
Placing the camshaft on a shaft support;
Pressing the camshaft from one end side thereof and positioning the camshaft reference portion;
Regulating the phase of the camshaft by gripping parallel side surfaces provided at the end of the camshaft;
Rotating the arm along the camshaft with respect to the predetermined cam of the camshaft and pressing the predetermined cam by an abutting member provided at the tip of the arm; and fixing the camshaft;
A support method for processing a camshaft characterized by comprising: The supporting method according to claim 1,
A support method for processing a camshaft, comprising a step of determining whether the camshaft is positioned correctly before the step of regulating the position of the camshaft. The supporting method according to claim 1 or 2,
The step of regulating the phase of the camshaft by gripping the parallel side surfaces of the camshaft is performed by a set of plungers that press the parallel surface of the camshaft under the action of the spring force of the coil spring. A support method for processing a camshaft characterized by the above. 4. The supporting method according to claim 1, wherein the step of pressing the camshaft from one end side thereof and positioning the camshaft on the abutting reference portion swings the swing arm by urging the actuator. A support method for machining a camshaft, wherein the camshaft is moved by pressing the swing arm against an end of the camshaft . A supporting apparatus for processing a camshaft cam shifting the plurality of phase and have at least mutually parallel sides end along the longitudinal direction is provided,
A plurality of rotatably supporting lifting unit provided on the table,
A reference portion abutting the one end portion of the placed camshaft on the axial support sandwiching member abuts,
An actuator for abutting the camshaft against the abutting reference portion;
A phase restricting portion sandwiching parallel side surfaces provided at an end of the camshaft;
A pressing portion for fixing by pressing the camshaft which is held in the axial support lifting unit,
The pressing portion includes an arm that is rotatably held by a support shaft, and an abutting member provided at one end of the arm, and the arm is in contact with a predetermined cam of the camshaft. A support device for machining a camshaft, wherein the camshaft is rotated along a camshaft to press the abutting member against the predetermined cam . The support device according to claim 5 , wherein
A support device for processing a camshaft, wherein the support device includes a positioning discriminating unit adapted to determine whether the camshaft machining position is correct or not according to a cam shape of the camshaft. The support device according to claim 5 or 6,
The phase restricting portion includes a pair of pressing members, and each of the pressing members includes a coil spring and a plunger that is pressed by the elastic force of the coil spring and abuts against a parallel surface of the camshaft. A support device for machining a characteristic camshaft. The support device according to claim 7,
The coil spring is pressed by a screw, and the amount of protrusion of the plunger to the cam shaft and the pressing force can be adjusted by adjusting the screw under a screw action. Support device. The support device according to any one of claims 5 to 8,
The actuator that abuts the camshaft against the abutting reference portion is a cylinder, and the piston rod of the cylinder is connected to a swing arm, and the piston is operated by urging the actuator to press the swing arm against the camshaft. A support device for processing a camshaft.

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