JP3736241B2 - Thrust surface machining apparatus and machining method for crankshaft positioning of cylinder block - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention includes an arbor inserted into a bearing portion of a crankshaft in a cylinder block and rotating integrally with a main shaft, and is rotatable in an eccentric state with respect to the arbor, and a thrust for positioning a crankshaft in the cylinder block at a tip. Thrust surface machining apparatus and machining method for crankshaft positioning of a cylinder block having a tool feeding eccentric shaft provided with a tool for machining a surface and a fixed sleeve provided on a workpiece positioning jig side for rotatably supporting an arbor About.
[0002]
[Problems to be solved by the invention]
An object of the present invention is to secure a squareness of an arbor that is rotatably supported by a fixed sleeve provided on a workpiece positioning jig side with respect to a thrust processing surface.
[0003]
[Means for Solving the Problems]
In order to achieve the above object, the invention of claim 1 is an arbor inserted into a bearing portion of a crankshaft in a cylinder block and rotated integrally with a main shaft, and is rotatably supported in an eccentric state with respect to the arbor. A tool feeding eccentric shaft provided with a tool for machining a thrust surface for crankshaft positioning in the cylinder block at the tip, and a fixed sleeve provided on the workpiece positioning jig side for rotatably supporting the arbor. In the thrust surface processing apparatus for positioning the crankshaft of the cylinder block having the fixed sleeve, the fixed sleeve is provided at a plurality of positions in the axial direction of the arbor, and the arbor and the main shaft are connected by a connecting portion that can be relatively displaced in the radial direction. It is as a configuration.
[0004]
According to the thrust surface machining apparatus for crankshaft positioning of the cylinder block having such a configuration, the tool feeding eccentric shaft tip of the tool feeding eccentric shaft when the arbor rotates together with the main shaft is obtained by rotating the tool feeding eccentric shaft with respect to the arbor. The machining locus changes depending on the amount of eccentricity between the arbor and the tool feeding eccentric shaft. Thereby, the site | part which a thrust surface requires from a center part to an outer peripheral part is cut. During such processing, the arbor is rotatably supported by fixed sleeves provided on the workpiece positioning jig side at a plurality of axial directions, and at the same time, can be relatively displaced in the radial direction with respect to the main shaft. Since they are connected by the connecting portion, even if the main shaft position is displaced in the radial direction, the arbor side maintains a squareness with respect to the fixed sleeve.
[0005]
According to a second aspect of the present invention, in the configuration of the first aspect of the present invention, the tool feeding eccentric shaft is configured to be narrower than other portions so that the vicinity of the connecting portion is easily elastically deformed.
[0006]
According to the above configuration, when the main shaft position is displaced in the radial direction, the tool feeding eccentric shaft reliably elastically deforms following the displacement of the main shaft in the vicinity of the connecting portion, ensuring a perpendicularity to the fixed sleeve on the arbor side. Is done.
[0007]
According to a third aspect of the present invention, the connecting portion is constituted by an Oldham coupling.
[0008]
According to the above configuration, when the main shaft position is displaced in the radial direction, the arbor is relatively displaced with respect to the main shaft via the Oldham coupling, and a squareness is secured with respect to the thrust surface.
[0009]
According to a fourth aspect of the present invention, an arbor that rotates integrally with a main shaft is inserted into a bearing portion of a crankshaft in a cylinder block, and the arbor is fixed to a workpiece positioning jig side fixing sleeve at a plurality of axial positions. The tip of the eccentric shaft of the tool feeding that can be rotated in an eccentric state with respect to the arbor in a state where the arbor and the main shaft are connected by a connecting portion that is relatively displaceable in the radial direction. And a machining method for machining a thrust surface for crankshaft positioning in the cylinder block.
[0010]
According to the above processing method, even if the main shaft position is displaced in the radial direction, the arbor is supported by the fixed sleeve at a plurality of axial positions and at the same time, the arbor is relatively displaced through the connecting portion. A right angle with respect to the thrust surface is secured.
[0011]
【The invention's effect】
According to the first aspect of the present invention, the arbor is rotatably supported by the fixing sleeve provided on the workpiece positioning jig side at a plurality of axial directions, and at the same time, the arbor can be relatively displaced in the radial direction with respect to the main shaft. Therefore, even if the main shaft position is displaced in the radial direction, the arbor side can maintain a squareness with respect to the fixed sleeve, and the processing accuracy for the thrust surface can be improved.
[0012]
According to the invention of claim 2, the tool feeding eccentric shaft is made thinner than the other parts so that the vicinity of the connecting portion is easily elastically deformed. Therefore, when the main shaft position is displaced in the radial direction, the tool feeding eccentric shaft is The shaft can be elastically deformed reliably in the vicinity of the connecting portion following the displacement of the main shaft, and a perpendicularity to the fixed sleeve on the arbor side can be secured.
[0013]
According to the invention of claim 3, since the connecting portion is configured by Oldham coupling, when the main shaft position is displaced in the radial direction, the arbor is displaced relative to the main shaft via the Oldham coupling. The perpendicularity to the thrust surface can be ensured.
[0014]
According to the invention of claim 4, even if the main shaft position is displaced in the radial direction, the arbor is supported by the fixed sleeve at a plurality of positions in the axial direction, and at the same time, the arbor is relatively displaced through the connecting portion. The perpendicularity to the thrust surface of the arbor can be ensured.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0016]
FIG. 1 is a sectional view of a thrust surface machining apparatus for crankshaft positioning of a cylinder block showing an embodiment of the present invention. The cylinder block 1 of the automobile engine is positioned and fixed to a workpiece positioning jig 3 at a portion not shown. The cylinder block 1 includes crankshaft bearing holes 5a, 5b, 5c, 5d, and 5e as bearings into which a crankshaft (not shown) is rotatably inserted. The left and right side surfaces are axial positioning thrust surfaces 7 and 9 of the crankshaft, and the thrust surfaces 7 and 9 are finished by this apparatus.
[0017]
The main shaft 10 of the present apparatus can be slid in the left-right direction in the figure via a slide unit on the bed on the workpiece positioning jig 3 side, and the central axis A is integrated with the main shaft 10 at the tip thereof. A floating arbor 11 is attached as an arbor that rotates around the center. The floating arbor 11 can be inserted into the crankshaft bearing holes 5a, 5b, 5c, 5d, and 5e, and is in a state of being inserted into the crankshaft bearing holes 5e and 5d from the right side in FIG.
[0018]
The floating arbor 11 is held by the main shaft 10 by arranging the flange 11a at the right end in the figure in the fixture 12, and the end surface 11b of the flange 11a and the end surface 10a of the main shaft 10 serve as a connecting portion. They are connected by Oldham coupling 13. That is, the Oldham coupling 13 allows the floating arbor 11 to rotate together with the main shaft 10 and at the same time be relatively displaced in the radial direction with respect to the main shaft 10.
[0019]
The floating arbor 11 is formed with an eccentric shaft insertion hole 11c penetrating in the axial direction at a position eccentric to the central axis A, and the tool feeding eccentric shaft 15 is centered on the central axis B in the eccentric shaft insertion hole 11c. Is inserted in a rotatable manner. The tool feeding eccentric shaft 15 has a tool tip 19 as a tool attached to the periphery of the tip protruding from the tip of the floating arbor 11 via a pair of cartridges 17. The thrust surfaces 7 and 9 are processed by the tool tip 19.
[0020]
The tool feeding eccentric shaft 15 is formed with a thin shaft portion 15a having a diameter smaller than that of the Oldham coupling 13 in the drawing in the vicinity of the right side, and is easily elastically deformed by the thin shaft portion 15a. It has become.
[0021]
On the other hand, fixed sleeves 21 and 23 are integrally provided on the workpiece positioning jig 3 side in a state of being disposed between the crankshaft bearing holes 5c and 5d and between the crankshaft bearing holes 5d and 5e. The fixed sleeves 21 and 23 are provided with bearings 25 and 27, respectively, and the floating arbor 11 is supported by the bearings 25 and 27 so that the floating arbor 11 can be rotated at two positions, that is, a tip portion thereof and a substantially central portion in the axial direction. ing.
[0022]
A fixed sleeve 29 is also provided between the crankshaft bearing holes 5b and 5c. This is because a tool feeding eccentric shaft for rough machining with respect to the thrust surfaces 7 and 9 is provided on the cylinder block 1 from the left side in the drawing. It is inserted and supported rotatably.
[0023]
By rotating the tool feeding eccentric shaft 15 about the central axis B with respect to the floating arbor 11, the machining locus of the tool tip 19 at the tip of the tool feeding eccentric shaft 15 when the floating arbor 11 rotates with the main shaft 10 is 11 and the eccentric amount T of the tool feeding eccentric shaft 15. Thereby, the necessary portions of the thrust surfaces 7 and 9 are cut from the central portion to the outer peripheral portion.
[0024]
At the time of such processing, the floating arbor 11 is rotatably supported by fixed sleeves 21 and 23 provided on the workpiece positioning jig 3 side in two axial directions, and at the same time, the Oldham cup with respect to the main shaft 10. Since they are connected by the ring 13, even if the position of the main shaft 10 is displaced in the radial direction, the positional relationship between the floating arbor 11 and the fixing sleeves 21 and 23 is always maintained at a constant accuracy. As the main shaft 10 is displaced in the radial direction, the tool feeding eccentric shaft 15 easily elastically deforms the thin shaft portion 15a whose diameter is reduced on the base end side, so that the distal end side of the thin shaft portion 15a has a floating arbor. 11, the parallelism is maintained.
[0025]
Thereby, even if the center alignment of the main shaft 10 and the floating arbor 11 is not highly accurate, the perpendicularity between the floating arbor 11 and the thrust surfaces 7 and 9 can be obtained with high accuracy, and the processing accuracy of the thrust surfaces 7 and 9 can be improved. Can be kept high.
[0026]
As a form in which the position of the main shaft 10 is displaced in the radial direction, there are wear of a slide unit on which the main shaft 10 slides, thermal deformation (warping) of the bed on which the slide unit is installed due to cutting water, a change in the foundation, and the like.
[0027]
FIG. 2 is an image diagram of the apparatus when the bed 33 on which the slide unit 31 is installed warps downward as shown by a two-dot chain line. According to this, due to the downward displacement of the slide unit 31, the main shaft 10 is displaced downward with the Oldham coupling 13 as a fulcrum, and the floating arbor 11 is secured in a horizontal state.
[0028]
On the other hand, FIG. 3 is an image view similar to FIG. 2 in which the arbor 35 is integrally formed with the main shaft 37 and the fixing sleeve 39 for rotatably supporting the arbor 35 is provided at only one place. According to this, it can be seen that due to the downward displacement of the slide unit 31, the arbor 35 is displaced together with the main shaft 37, and the perpendicularity to the thrust surfaces 7 and 9 is impaired.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a thrust surface machining apparatus for positioning a crankshaft of a cylinder block showing an embodiment of the present invention.
FIG. 2 is an operation explanatory diagram of the thrust surface processing apparatus of FIG. 1;
FIG. 3 is an operation explanatory view when the arbor is integrated with the main shaft and a fixed sleeve for rotatably supporting the arbor is provided at only one place with respect to the thrust surface machining apparatus of FIG. 1;
[Explanation of symbols]
1 Cylinder block 3 Work positioning jigs 5a, 5b, 5c, 5d, 5e Crankshaft bearing hole (bearing part)
7, 9 Thrust surface 10 Spindle 11 Floating arbor (arbor)
13 Oldham coupling (connection part)
15 Tool feeding eccentric shaft 15a Thin shaft portion 19 Tool tip (tool)
21,23 Fixed sleeve

Claims (4)

An arbor inserted into the bearing portion of the crankshaft in the cylinder block and rotated integrally with the main shaft, and is supported rotatably in an eccentric manner with respect to the arbor, and a thrust surface for positioning the crankshaft in the cylinder block at the tip In a thrust surface machining apparatus for crankshaft positioning of a cylinder block, comprising a tool feeding eccentric shaft provided with a tool for machining the workpiece, and a fixed sleeve provided on a workpiece positioning jig side for rotatably supporting the arbor, A thrust surface for positioning a crankshaft of a cylinder block, characterized in that fixing sleeves are provided at a plurality of locations in the axial direction of the arbor, and the arbor and the main shaft are connected by a connecting portion that can be relatively displaced in the radial direction. Processing equipment. 2. The thrust surface machining apparatus for crankshaft positioning of a cylinder block according to claim 1, wherein the tool feeding eccentric shaft is made thinner than other parts so that the vicinity of the connecting portion is easily elastically deformed. The thrust surface machining apparatus for crankshaft positioning of a cylinder block according to claim 1 or 2, wherein the connecting portion is constituted by an Oldham coupling. Insert an arbor that rotates integrally with the main shaft into the bearing part of the crankshaft in the cylinder block, and support this arbor rotatably at multiple locations in the axial direction with fixed sleeves on the workpiece positioning jig side. The tool provided at the tip of the tool feeding eccentric shaft that is rotatable in a state of being eccentric with respect to the arbor in a state where the arbor and the main shaft are connected by a connecting portion that is relatively displaceable in the radial direction. A thrust surface machining method for crankshaft positioning of a cylinder block, wherein a thrust surface for crankshaft positioning in the cylinder block is machined.

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