JP2008132561A - Differential case inner surface processing apparatus and processing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide differential case inner surface working device and working method, which works both of mutually opposing seat faces in a differential case with high precision. <P>SOLUTION: A spindle side driver 15 is provided on a spindle 13 of a working machine provided in an NC feeding unit 7, and a hydraulic cylinder side driver 17 is provided on a hydraulic feeding cylinder 41 provided in a hydraulic feeding unit 39. Each of these drivers 15, 17 is inserted into a shaft hole in the differential case 3 to nip and hold a spherical face cutter in the inside from both sides. A piston rod 53 of a hydraulic cylinder 51 for connection provided in a guide part 45 of the hydraulic feeding unit 39 is fixed by clamping by a clamp mechanism 57 provided in a movable part 11 of the NC feeding unit 7 and is connected with it, and the spindle side driver 15 is made to advance, retract, and move integrally with the spherical face cutter and the hydraulic cylinder side driver 17 by the operation of the NC feeding unit 7 to press mutually opposing spherical face seats in the differential case 3 for working. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a differential case inner surface processing apparatus and a processing method for pressing inner surfaces facing each other in a differential case of a differential device by a cutting tool disposed in the differential case.

A differential device used as a power transmission mechanism of an automobile includes a pair of side gears serving as a differential large gear and a pair of pinions serving as a differential small gear in the differential case, and the gears on the inner surface of the differential case are connected to each other. Cutting is performed on the facing seat surface (see Patent Document 1 below).
JP 2004-90181 A

  By the way, as a cutting process for such an inner surface of the differential case, a pair of pressing tools are inserted through shaft holes from both sides outside the differential case in a state where the cutting tool is arranged in the differential case, and the cutting tool is inserted from both sides with the pair of pressing tools. In the case where the pressing is performed while being pressed against the seating surface while being held, one pressing tool is connected to the main shaft of the NC processing machine, and the other pressing tool is connected to the hydraulic feed cylinder.

  Then, while the NC is controlled by the NC machine, the respective pressing tools are pushed and pulled by the main spindle of the NC machine and the hydraulic feed cylinder, so that the bearing surfaces facing each other on the inner surface of the differential case are cut by the cutting tools between the pressing tools. Cutting.

  However, in such a machining method, while machining with respect to one seating surface while being pushed by the main spindle of the NC processing machine, high-precision machining is possible by NC control, the other seating surface while being pushed by the hydraulic feed cylinder is possible. In machining with respect to the above, machining accuracy and machining position become unstable due to fluctuations in the feed speed and pressure of the hydraulic unit, and improvement is desired.

  In view of the above, an object of the present invention is to make it possible to accurately process both seating surfaces facing each other in a differential case.

  The present invention provides a differential case inner surface processing apparatus for pressing an inner surface facing each other in a differential case of a differential device having a gear mechanism therein by a cutting tool disposed in the differential case, and the shafts on both sides outside the differential case. A pair of pressing tools that are inserted from the holes to press the cutting tool from both sides and can reciprocate in the pressing direction are provided, and NC driving means for reciprocating one of the pressing tools is provided, The main feature is that a connection fixing means for connecting and fixing the respective support portions on the base end side of the tool is provided.

  According to the present invention, since the pair of pressing tools for pressing the cutting tool from both sides are connected to each other by the connection fixing means, one pressing tool is reciprocated by the NC driving means. Both opposing seating surfaces can be processed with high accuracy by NC control.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a front view of a differential case inner surface processing apparatus showing an embodiment of the present invention. On the base 1, a jig 5 for fixing a differential case 3 of a differential device, which is a workpiece, via a fixture 4 is installed, and an NC feeding unit as an NC driving means is placed on the right side of the jig 5 in FIG. 7 is installed. The jig 5 is rotatable with respect to the base 1 around the rotation support portion 8 located at a position shifted from the attachment position of the differential case 3.

  The NC feed unit 7 is provided with a movable part 11 movable on the NC feed unit base 9 in the left-right direction in FIG. 1, and a spindle 13 of a processing machine is attached to the upper left side of the movable part 11 in FIG. Yes. A spindle-side driver 15 serving as one of the pair of pressing tools is attached to the tip of the spindle 13.

  A spherical cutter 19 (see FIG. 2) as a cutting tool disposed in the differential case 3 by the main spindle side driver 15 and a hydraulic cylinder side driver 17 to be described later on the opposite side of the main spindle side driver 15 with the differential case 3 in between. ) Are clamped from both left and right sides, and the inner surfaces of the differential case 3 facing each other are pressed and pressed.

  Although not shown, the differential case 3 houses a pair of side gears fixed to the wheel drive shaft and a pair of pinions meshing with the side gears, which are gear mechanisms, and as shown in FIG. The main shaft side driver 15 and the hydraulic cylinder side driver 17 are respectively inserted from the shaft holes 21 and 23 into which the shaft is inserted.

  2 corresponds to a plan view of the front view of FIG. 1, and the spherical seats 19 are processed by the spherical cutter 19 which are the inner surfaces facing each other in the differential case 3. FIG. These spherical seats 25 and 27 are portions where the spherical back surfaces of a pair of left and right pinions (not shown) are in contact.

  On the other hand, FIG. 3 is a plan view similar to FIG. 2, except that the differential case 3 is rotated 90 degrees clockwise in FIG. 2 as a cutting tool disposed in the differential case 3. A state in which the flat seats 31 and 33 which are inner surfaces facing each other in the differential case 3 are processed by the cutter 29 is shown.

  The planar seats 31 and 33 are portions where the planar back surface of the side gear (not shown) contacts, and from the shaft holes 35 and 37 into which the wheel drive shaft (not shown) that rotatably supports the side gear is inserted, The main spindle side driver 15A and the hydraulic cylinder side driver 17A, which are different from the main spindle side driver 15 and the hydraulic cylinder side driver 17, are inserted.

  The differential case 3 is rotated 90 degrees between the state shown in FIG. 2 and the state shown in FIG. 3 by rotating the jig 5 shown in FIG. 1 90 degrees around the rotation support portion 8. . Therefore, the positions for processing the spherical seats 25 and 27 in FIG. 2 and the positions for processing the plane seats 31 and 33 in FIG. 2 are shifted from each other in the direction perpendicular to the paper surface in FIG. Two sets of the main spindle 13 of the processing machine and a hydraulic feed cylinder 41 of a hydraulic feed unit 39 to be described later are provided corresponding to the positions.

  That is, the spindle-side driver 15A and the hydraulic cylinder-side driver 17A used when machining the plane seats 31 and 33 in FIG. 3 described above correspond to the spindle (not shown) instead of the spindle 13 and the hydraulic feed cylinder 41. And a hydraulic feed cylinder.

  In the following description, the processing of the spherical seats 25 and 27 in FIG. 2 is performed.

  As shown in FIG. 1, the hydraulic cylinder side driver 17 is connected to a hydraulic feed cylinder 41 of a hydraulic feed unit 39 installed on the opposite side of the NC feed unit 7 with a jig 5 interposed therebetween. The hydraulic feed cylinder 41 can be moved toward and away from the differential case 3.

  The hydraulic feed unit 39 includes a guide portion 45 that can move along the guide rail 47 on the hydraulic feed unit base 43 provided on the base 1, and the hydraulic feed cylinder 41 described above is provided on the guide portion 45. ing.

  A cylinder mounting portion 49 is provided at a position shifted from the hydraulic feed cylinder 41 on the guide portion 45 in a direction perpendicular to the paper surface in FIG. 1, and the connecting hydraulic cylinder 51 is installed on the cylinder mounting portion 49. That is, the hydraulic feed cylinder 41 and the connecting hydraulic cylinder 51 are movable along the guide rail 47 together with the guide portion 45. The piston rod 53 of the connecting hydraulic cylinder 51 protrudes toward the NC feed unit 7 and is provided with a connecting jig 55 at the tip.

  The cylinder mounting portion 49 and the connecting hydraulic cylinder 51 described above are positioned between two hydraulic feed cylinders 41 arranged for spherical seat processing and flat seat processing in a direction orthogonal to the paper surface in FIG. It shall be.

  On the other hand, a clamp mechanism 57 is provided at a position corresponding to the connecting jig 55 on the movable portion 11 on the NC feeding unit 7 side, and the clamp mechanism 57 clamps the connecting jig 55 so that The movable part 11 on the NC feed unit 7 side and the guide part 45 serving as the movable part on the hydraulic feed unit 39 side are connected and fixed to each other.

  That is, the connecting fixing means (the connecting hydraulic cylinder 51, the connecting hydraulic cylinder 51, the connecting part (movable part 11, guide part 45)) that connects and fixes the respective support parts (movable part 11, guide part 45) on the base end side of each pressing tool (spindle side driver 15 and hydraulic cylinder side driver 17) The connecting jig 55 and the clamp mechanism 57) are provided, and the connecting hydraulic cylinder 51, the connecting jig 55, and the clamp mechanism 57 constitute a connection fixing means.

  Further, although the planar cutter 19 arranged in the differential case 3 is omitted in FIG. 1, as shown in FIG. 4, it is held by the tip (lower end) of a cutter holder 59 as a tool holder. Then, the simplified differential case 3 is inserted into the differential case 3 through a tool insertion hole 61 as an opening provided in the upper part in FIG.

  In the above cutter holder 59, the horizontal slide portion 63 at the upper end in FIG. 4 is movable in the horizontal direction (left and right in FIG. 4) along the horizontal guide rail 65. The horizontal guide rail 65 is , Provided below the vertical slide portion 67. The vertical slide portion 67 is movable in the vertical direction (vertical direction in FIG. 4) along the vertical guide rail 69 located at the left end in FIG. 4, and the vertical guide rail 69 is connected to the apparatus main body (base 1). ) Side support bracket 71.

  That is, the cutter holder 59 inserts and pulls out the held spherical cutter 19 into the differential case 3 by moving the vertical slide portion 67 in the vertical direction in FIG. Further, as the spindle-side driver 15 pushes and pulls the spherical cutter 19 to reciprocate during machining, the cutter holder 59 moves in the left-right direction in FIG. 4 along the horizontal guide rail 65 together with the horizontal slide portion 63.

  Further, a displacement sensor 73 as a processing position measuring means is attached to the lower part of the right end portion of the vertical slide portion 67 in FIG. The displacement sensor 73 measures the position of the cutter holder 59 in the left-right direction in FIG. 4, that is, the processing position by the held spherical cutter 19.

  The spherical cutter 19 includes an annular holding groove 19a at the center, and a semi-annular portion 59a at the tip of the cutter holder 59 is fitted into the holding groove 19a from above in FIG. 4, and a semi-circular bush 77 is provided from below. In this state, the bush 77 is bolted to the semi-annular portion 59a so that the cutter holder 59 holds the spherical cutter 19 rotatably.

  As for the flat cutter 29, as shown in FIG. 5, a cutter holder 79 as a tool holder and a semi-annular bush 81 are held by a holding mechanism similar to the spherical cutter 19. 3 and 5, 29a is an annular holding groove, and 29b and 29c are recesses into which the ends of the spindle driver 15A and the hydraulic cylinder driver 17A are inserted and fixed.

  Next, the operation will be described. In the description of this operation, the processing of the spherical seats 25 and 27 in FIG. 2 is performed.

  As shown in FIG. 1, the spherical cutter 19 held by the cutter holder 59 is inserted into the differential case 3 from the tool insertion hole 61 as shown in FIG. 4 with respect to the differential case 3 installed and fixed on the jig 5.

  At this time, the connecting jig 55 at the tip of the piston rod 53 of the connecting hydraulic cylinder 51 shown in FIG. 1 is not clamped by the clamp mechanism 57 on the NC feed unit 7 side, and the movable part 11 of the NC feed unit 7 The connection and fixing with the guide portion 45 of the hydraulic feed unit 39 is released.

  In this state, as shown in FIG. 2, by moving the movable portion 11 forward by the NC feed unit 7, the spindle-side driver 15 is inserted into the differential case 3 from the shaft hole 21, and the hydraulic feed cylinder 41 is driven forward. The hydraulic cylinder side driver 17 is inserted into the differential case 3 from the shaft hole 23. The drivers 15 and 17 inserted into the differential case 3 have their tips inserted and fixed in the recesses 19b and 19c of the spherical cutter 19, respectively.

  Since the hydraulic cylinder side driver 17 is inserted into the differential case 3 by the forward drive of the hydraulic feed cylinder 41, the spherical cutter 19 can be reliably held between the main shaft side driver 15 and the driver.

  In the state shown in FIG. 2, the spherical cutter 19 is substantially at the center position in the left-right direction in FIG. 2 in the space in the differential case 3 that accommodates the spherical cutter 19, and moves to the left and right from this center position. Each of 25 and 27 can be cut.

  Next, the connecting hydraulic cylinder 51 is driven forward, the piston rod 53 is advanced, and the connecting jig 55 at the tip is clamped and fixed by the clamp mechanism 57 on the NC feed unit 7 side. After the clamp is fixed, the connecting hydraulic cylinder 51 is always operated in the direction of pulling the movable part 11 on the NC feed unit 7 side.

  Accordingly, the movable portion 11 of the NC feed unit 7 and the guide portion of the hydraulic feed unit 39 are pressed by the spindle driver 15 and the hydraulic cylinder side driver 17 so as to sandwich the spherical cutter 19 from both the left and right sides in FIG. 45 are connected and fixed to each other by the connecting hydraulic cylinder 51.

  That is, the connecting hydraulic cylinder 51 presses the main spindle driver 15 and the hydraulic cylinder driver 17 in a direction approaching each other with the spherical cutter 19 in between, thereby ensuring a connected state and the spherical cutter 19. Retention is ensured.

  Thus, preparations for machining the spherical seats 25 and 27 are completed. In this state, the spindle 13 of the processing machine is rotated, so that the spindle driver 15, the spherical cutter 19 and the hydraulic cylinder driver 17 are integrated. Rotate to

  During the rotation of the spherical cutter 19 as described above, the NC feed unit 7 is driven to move the movable part 11 together with the guide part 45 of the connected hydraulic feed unit 39 via the connecting hydraulic cylinder 51 as shown in FIG. The spherical seat 25 is cut by moving it forward in the left direction and pressing the rotating spherical cutter 19 against the spherical seat 25 on the hydraulic feed unit 39 side.

  Conversely, by driving the NC feed unit 7, the movable portion 11 is moved backward together with the guide portion 45 of the hydraulic feed unit 39 in the right direction in FIG. 1, and the rotating spherical cutter 19 is moved to the NC feed unit 7. The spherical seat 27 is cut by being pressed against the spherical seat 27 on the side.

  As described above, when the spherical seats 25 and 27 that are the inner surfaces facing each other in the differential case 3 are processed, the one spherical seat 25 is moved by the forward movement of the movable portion 11 by the NC feed unit 7 and the other spherical seat is made. 27 is performed by moving the movable part 11 backward by the NC feed unit 7, and the NC feed unit 7 is used for processing of both spherical seats 25 and 27.

  For this reason, the processing of the spherical seats 25 and 27 which are the inner surfaces facing each other in the differential case 3 can be performed with high accuracy by NC control.

  In the processing, as shown in FIG. 4, the displacement displacement of the cutter holder 59 relative to the horizontal guide rail 65 is measured by the displacement sensor 73, and left and right spherical seats by the spherical cutter 19 held by the cutter holder 59. Measure machining end positions for 25 and 27.

  Thus, since the left and right machining end positions are measured by the displacement of the cutter holder 59 holding the spherical cutter 19, a value closer to the actual measurement value can be obtained, which can contribute to the improvement of machining accuracy.

  Although the processing of the spherical seats 25 and 27 has been described above, the NC feed unit 7 can be moved with respect to the processing of the plane seats 31 and 33 shown in FIGS. Since the part 11 and the guide part 45 of the hydraulic feed unit 39 are integrated by the connecting hydraulic cylinder 51 and moved forward and backward by driving the NC feed unit 7, high-precision machining is possible. Become.

  Further, regarding the measurement of the machining end position for each of the left and right planar seats 31 and 33, the cutter holder 79 holding the planar cutter 29 is moved relative to the horizontal guide rail in the same manner as the machining of the spherical seats 25 and 27 shown in FIG. Since the displacement sensor measures the displacement, a value closer to the actual measurement value can be obtained, which can contribute to improvement of machining accuracy.

It is a front view of the differential case inner surface processing apparatus which shows one Embodiment of this invention. It is a top view which shows the state which processes the spherical seat in a differential case by the differential case inner surface processing apparatus of FIG. It is a top view which shows the state which processes the plane seat in a differential case with the differential case inner surface processing apparatus of FIG. It is a front view of the cutter holder periphery in the differential case inner surface processing apparatus of FIG. It is a front view which shows the state which is processing the plane seat with the plane cutter hold | maintained at the cutter holder.

Explanation of symbols

3 Differential case 7 NC feed unit (NC drive means)
11 NC feed unit movable part (support part)
15, 15A Spindle side driver (pressing tool)
17, 17A Hydraulic cylinder side driver (pressing tool)
19 Spherical cutter (cutting tool)
21, 23 Shaft hole 29 Flat cutter (cutting tool)
25, 27 Spherical seat (inner surfaces facing each other in the differential case)
31, 33 Planar face (inner surfaces facing each other in the differential case)
35, 37 Shaft hole 45 Guide part (support part) of hydraulic feed unit
51 Hydraulic cylinder for connection (hydraulic cylinder, connection fixing means)
55 Connection jig (connection fixing means)
57 Clamp mechanism (connection fixing means)
59, 79 Cutter holder (tool holder)
61 Tool insertion hole (opening hole)
73 Displacement sensor (processing position measuring means)

Claims (5)

  In the differential case inner surface processing apparatus, in which the mutually facing inner surfaces in the differential case of the differential device having a gear mechanism are pressed by a cutting tool disposed in the differential case and inserted through the shaft holes on both sides outside the differential case. A pair of pressing tools that press the cutting tool from both sides and reciprocally move in the pressing direction, NC driving means for reciprocating one of the pressing tools is provided, and a base end of each pressing tool A differential case inner surface processing apparatus, comprising a connecting and fixing means for connecting and fixing the respective support portions on the side.   The cutting tool is held by a tool holder inserted from the opening hole of the differential case, the tool holder is provided so as to be movable in the same direction as the reciprocating direction of the pressing tool, and the reciprocating position of the tool holder is measured. 2. The differential case inner surface processing apparatus according to claim 1, further comprising processing position measuring means for measuring a processing position of the inner surface of the differential case.   The inner surface of a differential case according to claim 1 or 2, wherein the coupling fixing means includes a hydraulic cylinder, and the pressing tool presses the pressing tools in a direction approaching each other with the cutting tool interposed therebetween. Processing equipment.   The differential case according to any one of claims 1 to 3, further comprising a hydraulic feed cylinder that reciprocally moves the other of the pressing tools with respect to the support portion of the other pressing tool. Internal processing equipment.   In a differential case inner surface machining method in which inner surfaces facing each other in a differential case of a differential device having a gear mechanism inside are pressed by a cutting tool arranged in the differential case, the differential case is inserted into shaft holes from both sides outside the differential case. A pair of pressing tools capable of pressing the cutting tool from both sides and reciprocating in the pressing direction, and connecting and fixing the support portions on the base end side of the pressing tools by connecting and fixing means. The NC driving means provided on one of the tools causes the one pressing tool to move forward together with the other pressing tool together with the cutting tool, thereby pressing the cutting tool against one of the inner surfaces of the differential case. Then, the NC pressing means moves the one pressing tool together with the cutting tool to the other pressing device. Only ingredients and by retracting move integrally, the differential case inner surface machining method characterized in that processing by pressing the cutting tool to the other of the differential case inner surface.

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