JPS61121865A - Cam grinder - Google Patents

Abstract

PURPOSE:To process many kinds of cam shafts without exchanging a master cam by controlling a frictional clutch by making use of a relative angle of rotation between a main shaft detected by a rotary encoder and a master cam shaft for supporting many sets of the master cams. CONSTITUTION:A master cam shaft 22 for supporting many sets of master cams, each set comprising an intake cam and an exhaust cam IN, EX, corresponding to an engine cam shaft W of one kind, and a main shaft 4 being concentric with the master cam shaft are rotatably provided on a cradle 3, and connected with the cradle by means of a detachable frictional clutch 27. A phase angle detection shaft 52 of the main shaft 4 is connected with a rotary encoder 47 fixedly mounted on the rear end of the shaft 52 through a central hole in the shaft 22, and the frictional clutch 27 is controlled by making use of a detected relative angle of rotation between the main shaft and the cam shaft. Thus, the number of the master cams required for works of one kind is minimized, whereby a master cam for works of many kinds can be assembled.

Description

[Detailed Description of the Invention] [Objective of the Invention] "Industrial Application Field" The present invention relates to a cam grinding machine for copying and grinding the cam portion of a camshaft of a multi-cylinder internal combustion engine using a master cam, particularly for various types of cam grinders.
This invention relates to a cam grinder for grinding camshafts with small rods.

"Prior Art" FIG. 2 is a front view of a cradle that supports a workpiece in a cam grinder. On a rocking table 3 supported by a rocking shaft λ supported at both ends by a grinding machine table, a headstock part A is arranged on the left side and a workpiece mounting part B is arranged on the right side. A workpiece drive tool 6 is fixed to the headstock portion A, and the workpiece drive tool 6 is provided with a drive tool 5 that is adjustable in the rotational direction at the end of the main spindle, which is rotatably supported by a rocking table J, and the workpiece W is inserted through the drive tool 6. Both ends are supported by the center tower inserted into the main shaft II# and the center tower fixed so that it can be moved in and out of the tailstock 5 end, whose position can be adjusted and fixed in the direction of the main shaft axis on the rocking table J. engages with the keyway at the end of the work W.

A master cam 77 group is fixed to the main shaft. In the currently used cam grinding machine, the master cam l1 group is the sum of the numbers for each type of workpiece W and is arranged in parallel with the main shaft D.

Rotation of the main shaft DA is transmitted from a pulley λO fixed to the shaft end of the motor 10 via a belt/lI to a step boob IJ 1511 rotatably supported on the same axis as the swing shaft, and the step boob IJ/z Rotation is transmitted from 'b to a pulley /6 fixed to the end of the main shaft by a belt /7, and the pulley /6 is rotated.

A rotatable follower roller/Y is arranged on the same side as the cylindrical grinding wheel/3 provided on the grinding machine head.

In Figure 2, the grinding wheel/J and follower roller/J are located above the rocking table 3, but these grinding wheel/3 and follower roller/J are located above the rocking table J for the purpose of realizing the figure.
The rocking table J is always energized so that one of the master cams/l is in pressure contact with the follower roller/2 during grinding.

When motor/Q is energized, pulley/4 is turned and the main shaft ≠
turns. Then, the follower roller LY rolls on the master cam/L that is in contact with it, and the swing table 3 swings around the swing shaft 1, and the rotating grinding wheel/J rotates the workpiece W into a predetermined position. Form the cam profile.

``Problems to be Solved by the Invention'' In this type of conventional workpiece support device for a cam grinder, the master cams are arranged in parallel in the axial direction in order to coaxially support the workpiece and rotate the master cam. The number of master cams required is the same as the number of cams in the camshaft to be machined.

However, recently there has been an increasing demand for machining many types of camshafts with the same machine, and the number of types of master cams that are incorporated into the same main shaft of a workpiece support device has also increased. However, in order to process many types of camshafts with the same machine, unless the number of master cams required to process M-class camshafts is reduced, the number of types of master cams that are incorporated into the same main shaft of the workpiece support device must be increased. That is impossible.

An object of the present invention is to provide a cam grinder that can process many types of camshafts using a minimum number of master cams without replacing the master cam.

[Structure of the invention]

``Means for Solving the Problems'' The present invention rotatably supports a main shaft for rotationally driving a workpiece in a cradle of a cam grinding machine, and also rotatably supports a master cam shaft carrying a master cam along with the main shaft. ,
The master cam shaft and the main shaft are connected via a detachable friction clutch, an encoder is fixed to the rear end of the master cam shaft, and the encoder shaft is inserted through a cam phase detection shaft that passes through the center hole of the master cam shaft. This is a cam grinding machine that is connected to a main shaft, and a master cam shaft and a rotary drive device are connected.

"Operation" When a cam indexing command signal is used, for example, in the case of a friction clutch that is connected by hydraulic pressure, the supply of hydraulic pressure is cut off, and the main shaft and master cam shaft can freely rotate relative to each other, and only the master cam shaft is relative to the main shaft. Rotate. The relative rotation angle between the master cam shaft and the main shaft is transmitted to the encoder via the cam phase detection shaft, the rotation angle detected by the encoder is guided to the control device, and when the rotation angle reaches a predetermined cam phase equivalent angle, the control device detects friction. By energizing the clutch, the main shaft and master cam shaft are fixed, and the master cam rotates relative to the workpiece by an amount corresponding to the cam phase.

"Embodiments" Examples of the present invention will be described below with reference to the drawings. In the following description, the axial direction refers to the axial direction of the main shaft, although it may not be specified otherwise.

Figure 1 is a vertical cross-sectional view of the headstock portion A of the cam grinder, including the main shaft.

The main shaft is fitted into bearings /f and 2/ provided on a bearing stand /g fixed to the rocking table J, and is supported so as not to move in the axial direction.

The master cam l1 group is the same master cam shaft as the main shaft.
The master cam shaft unit is fixed to the bearing stand 3.2 fixed to the rocking table J. Bearings ready for Koda! , is rotatably supported by rollers and supported by a bearing unit 6 so as not to move in the axial direction.

A clamping sleeve cog is fitted and fixed into the center hole at the rear end of the main shaft l, and the clamping sleeve cog is attached to the inner diameter of the clamping sleeve core so that when the clamping sleeve core is not in operation, the main shaft and the master cam shaft unit can freely rotate (so that they rotate relative to each other). The end of the master cam shaft unit is sliding in.

The middle part of the outer periphery of the clamping sleeve core is made smaller in diameter than the part with the circumferential groove into which the sealing ring g is fitted at both ends, and forms a pressure chamber. The rotation of the hydraulic rotary joint 3/, which is fitted into the main shaft DA in an oil-sealed manner, is stopped by a detent jjf fixed by a machine screw J- screwed into the rocking table 3.

Pressure oil passes through the piping to the hydraulic rotary joint 3 via the switching valve 3≠
Hydraulic pressure is applied from the radial oil passage J3 of No. 1 to the pressure chamber cog via the radial oil passage J3 of the main shaft through the circumference $34 of the main shaft.

In the present invention, the master cam/l is a master cam IN for creating an intake cam and a master cam I for creating an F-gist cam for the intake and exhaust of the engine. Two pieces of lx are available. And Master Cam IN and Master Cam 1
nX is in the same phase. That is, the cam tops should be aligned.

Therefore, for example, in the case of a six-cylinder engine, a total of 12 intake and exhaust master cams are required, but in the present invention, only 2 master cams are required.
There are 1 pieces. Also, even if the internal combustion engine is different and the phase difference between the intake cam and the F-gist cam is different, the cam shapes are the same. ! X
Grinding can be done in the same way with one piece.

Between the pulley 3g fixed to the rear end of the master camshaft 2 and the pulley lug fixed to the shaft end of the motor 3D, there is a pulley 3g fixed to the rear end of the motor 3D. IJ tItl and pulley, y
Belt lI between t! are wrapped and connected.

Intermediate boo IJ l! The motor 3 can be fixedly mounted on the grinding machine table 1 by aligning the shaft center with the swing axis y. If this is not the case, fix the motor 3 to the rocking table J.

A rotary encoder is fixed to the pulley JK fixed to the master cam shaft 2 via a cylindrical distance piece 6, and a rotary encoder is fixed to the distance piece 6 via a bracket lIg.
A rotary contactor dub is fixed which takes the signal from 7. A shaft coupling is attached to the rotary shaft of the rotary encoder! The cam phase detection shaft octopus, one end of which is fixed via the l, is rotatably inserted into the center hole of the master cam shaft, and the other end is inserted into the center hole of the main shaft and screwed in the radial direction of the main shaft. Set screw! It is fixed by 3.

Rotary encoder Hiro 7 to rotary contactor '7
The switching valve JDA 5QL-/ is controlled by the signal taken out via the control device via the control device. When calculating the mutual phase angle of the cams in the grinding order of the workpiece W, this control device receives a signal from the rotary encoder after energizing 5QL-/, and when the number of pulses corresponding to the indexing angle has been counted, the switching valve 31I 5QL-/ is cut off.

When grinding the cam, the switching valve 74Z 5QL-/ is deenergized, and the pressure oil flows from the oil passage 3 of the hydraulic rotary joint to the pressure chamber cog via the circumferential groove J6 of the main shaft and the oil passage 37 of the main shaft. The diameter of the clamping sleeve core is reduced by this hydraulic pressure, and the clamping sleeve core holds and fixes the master cam shaft 1, so the master cam shaft 1 and the main shaft 1 are integrated. It has become.

First, the work W is supported between both centers 7 and 9, and the work drive metal 3 is engaged with the work W. As shown in FIG. 2, the phase of the intake cam I is made to match the phase of the master cam N. Next, bring Master Kamue N into contact with the follower roller saw. When motor 3D is energized, pulley lI/
rotates, and the intermediate pulley '12. The pulley 3g is rotated by being decelerated by Il'l, and the main shaft DA is rotated via the master cam shaft 2 and the clamping sleeve core, and the master cam/
/ rotates integrally with the main shaft.

At this time, the speed of the rotation of the work W is changed by the motor 3D even during one rotation so as to perform optimal grinding. The drive tool 6 rotates with the drive metal 5 to rotate the work W, and the intake cam/IN is driven by the grinding wheel/3 and the follower roller/Y mounted on the grinding machine table/Y presses the master wheel N. As the rocking table 3 is rocked, copy grinding is performed.

When the machining of the intake cam/work N is completed, the master cam/l is separated from the follower roller lλ by the retraction cylinder of the oscillating table J of the circuit.

Next, the grinding machine table is indexed to the position where the next efjst cam/IX corresponds to the grinding wheel 13+, and the follower roller/yu is further shifted to the position of the master cam IX. On the other hand, when the machining of the intake cam/IN for the first cylinder of the engine is completed, the motor 3 rotates at a reduced speed, and the master cam shaft and main shaft rotate at a low speed.
Subsequently, 8OL-/ of the switching valve 31I is energized from a control device (not shown), and the pressure chamber between the clamping sleeve and the main shaft is switched via the oil passage 37, the circumferential groove 36, and the oil passage Jj1 external piping. It is guided to the drain by the switching valve 3≠. The clamping sleeve is restored, and the main shaft and master cam shaft can now rotate freely, allowing motor 3 to rotate freely.
The master camshaft 2 continues to rotate because the master camshaft 2 continues to rotate, and the main shaft 2 eventually decelerates or stops due to the frictional resistance of the support, so the main shaft 2 and the master camshaft 2 rotate relative to each other.

This relative rotation angle is detected by a rotary encoder≠7 via the cam phase detection shaft SX, and the rotary encoder 7 is sent to an external control device by a rotary contactor 7. When the external control device counts the number of pulses sent from the rotary encoder 7 that corresponds to the phase angle in the rotational direction of the master cam shaft knee of the efjst cam/EX and intake cam/IN, the switching valve 3≠5QL- / is cut off, hydraulic pressure is applied to the pressure chamber via the switching valve 74 (, the external piping, the oil passage 3, the circumferential groove 36, and the oil passage 3), and the diameter of the clamping sleeve core is reduced. Then, the main shaft DA and the master cam shaft 2λ are fixed and integrated, and the indexing is completed.

Thus, the F-Gist cam 7KX is patterned and ground using the grinding wheel 13 in the same manner as described above.

When the machining of the F-Gist cam 7zx is completed, the master cam/l is separated from the follower roller/2, and the workpiece W
-x;,) Index the grinding machine table/longitudinal direction so that Camco EX corresponds to grinding wheel/3, and set the follower roller 12 again to the exhaust cam creation mask - cam EX. At the same time, the master cam shaft is indexed and rotated with respect to the main shaft by the phase angle of the efjst cam /EX and -EX.

This indexing rotation of the master cam // is performed in the following manner.

Intake cam/I for the first cylinder of the engine mentioned above
N, when the exhaust cam/EX machining is completed, the motor 39
The master cam shaft 1 rotates at a reduced speed, the main shaft DA rotates at a low speed, and then the switching valve 34! 5QL-/ is energized from a control device (not shown), and the clamping sleeve λ7
The pressure chamber -9 between the oil passage 3 and the main shaft DA is connected to the oil passage 3, the circumferential groove 36, and the oil passage 3j1 via the switching valve 34, which is switched via external piping. is led to the drain. The clamping sleeve 27 is restored, and the main shaft 1 and the master cam shaft 1 can rotate freely relative to each other, and the motor 3 continues to rotate, so the master cam shaft 22 continues to rotate, and the main shaft 1 is soon supported. The main shaft 42 and the master cam shaft 42 rotate relative to each other because the main shaft 42 is decelerated or stopped due to the frictional resistance of the parts. This relative rotation angle is detected by a rotary encoder 7 via a cam phase detection shaft 5.2, and the rotary encoder 7 is sent to an external control device by a rotary contactor dub. When the external control device counts the number of pulses sent from the rotary encoder Doug that correspond to the phase angle in the rotational direction of the master cam shafts of the F-Gist cam L original and F-GEST cam UEX, it calculates 5QL-/ of the switching valve Jφ. Due to power outage, selector valve 3
Hydraulic pressure is applied to the pressure chamber knob through the pipe, external piping, oil passage 33, circumferential groove J, and oil passage 37, the diameter of the clamping sleeve 7 is reduced, and the main shaft and master cam shaft 2 are fixed. and the indexing is completed.

With this, you can copy and grind the F-G-st cam-■ using the Follower Ronia 1 and the master cam EX for creating the F-G-st cam in the master cam/l, and when copy-grinding the second intake cam-IN, Cam/I
The rotation indexing operation of master cam II is performed in the same way as when the machining was changed from N to F-GIST cam/1i1iX, and the intake gum of follower roller/2 is
Processing is performed by shifting to the creation master cam/l.

Similarly, while rotating and indexing the master cam/l with respect to the main shaft by a predetermined angle, the intake cam, 7IN, HiroshiIN, and F-gist cam are rotated. I [! X.

! E! Grind X sequentially. As a result, each intake and efjst cam can be patterned and ground by a set of two master cams.

When grinding other types of cams, if a set of two master cams, one for creating an intake cam and the other for creating an F-ggest cam, are arranged side by side on the master cam 77 group, it is only necessary to change the position of the follower roller/yu.

Also, as long as the intake cam and the F-gist cam are camshafts equipped with cams of the same shape, the phase difference between the intake cam and F-gist cam of the pair is determined, so it is only possible when the number of cylinders is different. Even if the internal combustion engine is different, only two identical master cams are required.

In the embodiment, a center hole is provided at the rear end of the main shaft, a clamping sleeve is fitted and fixed into the center hole, and the front end of the master cam shaft is fitted into the clamping sleeve, but the relationship between the main shaft and the master cam shaft may be reversed.

Therefore, the connection means between the main shaft and the master cam is such that a clamping sleeve whose diameter changes by elastic deformation due to hydraulic pressure is fixed to one of the master cam shaft or main shaft, and the inner diameter of the clamping sleeve is connected to the other master cam shaft or main shaft. At the same time, a pressure chamber is provided between the shaft on the side where the clamping sleeve is fixed and the clamping sleeve, and an oil passage leading to the outside communicates with the hydraulic rotary joint fitted on the shaft on the side where the clamping sleeve is fixed. This is not limited to friction clutches that obtain frictional force by utilizing the deformation of the diameter of the ramping sleeve.
The main shaft and the master camshaft may be connected to each other so as to be freely connected to and separated from each other via another friction clutch such as a multi-disc clutch.

〔Effect of the invention〕

As described above, the present invention includes a set of two master cams for cam generation corresponding to one type of engine camshaft, and multiple sets of master cams for cam generation so as to correspond to many types of engine camshafts. The master cam shaft to be carried and a concentric main shaft are rotatably mounted on a cradle and connected by a removable friction notch, and a phase angle detection shaft fixed to the main shaft is inserted through the center hole of the master cam shaft. A rotary encoder fixed to the rear end of the master camshaft (this is connected to the phase angle detection shaft so that the friction clutch is controlled by the relative rotation angle between the main shaft and the master camshaft detected by the rotary encoder, thereby driving the master camshaft) Since the cam grinding machine is equipped with a device, (1) the number of master cams for seven types of workpieces is minimized.

(-) It is possible to incorporate master cams for much more moderate workpieces than in the past.

(J) When grinding the engine cam, there is no variation in the profiles of the intake cam and master cam in each cylinder.

(ri) When manufacturing a model cam, the intake cam,
It is easy to manufacture model cams because only 7 sets of exhaust cams need to be made, and there are fewer master cams, so the number of machining steps can be reduced.

) It is also possible to index the intake cam and the F-gist cam for the same cylinder, so the cam shape does not change, but the phase difference between the intake cam and the F-gist cam for the same cylinder is different even when machining a camshaft for an internal combustion engine. Only 7 sets of the same master cam are required, making it easy to adapt to 7MS.

[Brief explanation of drawings]

FIG. 7 is a front view of the cradle portion of the cam grinder, and FIG. 2 is a longitudinal sectional view of the embodiment of the present invention. /・-Grinding machine table 2・・Swinging axis 3・−Swinging table
Da... main axis!・・Driver ４・・Driver ri・・Center G・・Tailstock De・Fist center / θ fist・Motor /
/-Fist Master Cam /Yu-Follower Roller /J
・・Grinding wheel /+・・Bell) tra, /sb・
・Step pulley /l-・Pulley Noah・・Belt ig・
-Ring holder /9...Bearing 20...Pulley λl...Bearing -Co...Master cam shaft, 2se Utah -s + cradle!
Yo, Yu 6 - Bearing, 27 @ Clamping sleeve
U&φ・Sealing ring Cob・・Pressure chamber 31・・Hydraulic rotary joint 32・・Machine screw J3・・Stop rotation 34!・・Switching valve J3・-Oil path 36・・Circumferential groove J・・Oil path 3
S...Pulley 3911・Motor Reference 1+1@Pulley
≠2...Middle pulley 'AJ-'Belt Dada--Medium nR
Fu-IJ ll66・Bell) 4'4@・Tistance piece Dub・・Rotary encoder Dag・・
Bracket Dove... Rotary contactor &/... Shaft coupling! Yu [Co., Ltd.] Cam phase detection axis! J11 Set screw A... Headstock part B, - Workpiece mounting part IN... Master cam for intake cam generation l Engineering M-, -11 Engineering 1 @ Life intake cam KX... Master cam for F-gist cam generation /FIX ~Tei Bx...FJ Stock Cam W...Work.

Claims (1)

[Scope of Claims] 1. A main shaft for rotationally driving a workpiece is rotatably supported in a cradle of a cam grinding machine, and a master cam shaft carrying a master cam concentrically with the main shaft is rotatably supported; The main shaft is connected via a friction clutch that can be engaged and disengaged, and an encoder is fixed to the rear end of the master cam shaft.
A cam grinding machine in which the encoder shaft is connected to the main shaft via a cam phase detection shaft inserted through the center hole of the master cam shaft, and the master cam shaft is connected to a rotary drive device. 2. A friction clutch that can freely engage and disengage the master camshaft and main shaft fixes a clamping sleeve whose diameter changes by elastically deforming due to hydraulic pressure to either the master camshaft or the main shaft, and connects the other master to the inner diameter of the clamping sleeve. A pressure chamber is provided between the clamping sleeve and the shaft on which the clamping sleeve is fixed while the camshaft or main shaft is inserted, and an oil passage is introduced to the outside. The cam grinding machine according to claim 2, which communicates with the joint and with an external hydraulic power source.