JPH04762B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of machining positioning holes for connecting split casings.

[Prior Art] In an automatic transmission casing that uses a rotatable bearing structure, the coaxial core bearing is formed of two or more casing parts, and due to space constraints, the span between the bearings is short and the coaxial accuracy is When required, conventionally the casing parts were positioned using a dowel pin or a dowel shape, and the bearing diameter was drilled using a drill or the like.

[Problems to be Solved by the Invention] However, in the above processing method, the casing parts are positioned and the bearing diameter is drilled using a drill etc., so the drill becomes long.
This results in increased machining resistance, poor machining accuracy, longer machining time, and the need to increase the rigidity of the jig, resulting in an increase in the size of the jig.

The present invention solves the above problems, and includes:
For connecting split casings, by individually machining the bearing parts on the split casings, it is possible to improve the machining accuracy of the bearing diameter and shorten the machining time, and also to easily position the bearing parts of the split casings coaxially. The purpose of this invention is to provide a positioning hole machining method.

[Means for Solving the Problems] For this purpose, the method of machining positioning holes for connecting divided casings of the present invention is a method of machining positioning holes for connecting divided casings each having a coaxial bearing portion for supporting a rotating member. a step of machining each bearing diameter on the casing; a step of joining each of the divided casings at a predetermined position and clamping the bearing portion with a jig from inside the bearing portion;
The method comprises the steps of temporarily tightening the clamped split casings and positioning them coaxially, and drilling positioning holes in two or more locations of the joined and positioned split casings to communicate the two. Features.

[Operations and Effects of the Invention] In the present invention, since the bearing diameter is machined on each of the divided casings individually, it is possible to improve the machining accuracy of the bearing diameter and shorten the machining time.

Furthermore, since positioning holes are co-drilled at two or more locations while clamped coaxially with a jig, even if the bearing parts are machined individually in the split casing, the positioning of the co-drilled holes will be fixed when assembling the split casing. By simply matching the holes, the bearing parts of the split casing can be positioned coaxially. Therefore, in cases where positioning using a jig is difficult during assembly, such as when assembling the rotating member supported by the bearing part of the split casing and then assembling the split casing, the split casing allows the bearing parts to be easily coaxial. You can get the casing. Further, even when disassembled and reassembled for repair, it can be assembled with high precision without requiring any jigs. In addition, after each bearing part of the split casing is machined, the split casings are joined and temporarily tightened, and then the positioning holes are drilled, so chips do not enter the machined bearing part, and the chip removal process can be simplified.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view of the casing of an automatic transmission to which the present invention is applied, viewed from the rear cover side, and FIG. 2 is a diagram for explaining one embodiment of the method of machining positioning holes for connection of split casings of the present invention. and the first
FIG. 3 is a sectional view taken along line A-A in the figure, and FIG. 3 is a sectional view of an automatic transmission to which the present invention is applied.

In the processing method of the present invention, first, as a first step, the bearing parts 3 and 4 of the rear cover 1 and the case 2, which are divided casings of an automatic transmission manufactured through a predetermined processing process, are individually assembled. Processing is carried out to finish the bearing diameter with high precision.

Next, as a second step, the bearing part 3 of the rear cover 1 is clamped in the radial direction with a collection chuck 5 (jig), and at the same time, the bearing part 3 of the case 2 is clamped with an arbor 6 (jig) with a reduced clearance. It is regulated in the radial direction, and coaxial accuracy is achieved with the collector chuck 5 and arbor 6. In this case, the direction of rotation is controlled by fitting dowel pins into holes 7 and 8 shown by broken lines, which are individually machined.

Next, as a third step, the rear cover 1 and the case 2 are temporarily tightened with bolts (not shown) at predetermined positions to position the rear cover 1 and the case 2 while achieving the above-mentioned coaxial accuracy.

Next, as a fourth step, remove the dowel pins from the holes 7 and 8, and
Positioning hole 1 for connection with a diameter larger than holes 7 and 8 in 0
Correct holes 1 and 12.

Therefore, since the bearing diameters are machined on each of the divided casings 1 and 2 individually, it is possible to improve the machining accuracy of the bearing diameters and shorten the machining time. Further, since the bearing parts 3 and 4 are clamped or restricted by the jigs 5 and 6 from inside the bearing parts, the size of the jigs can be reduced.

Furthermore, the split casings 1 and 2 are coaxially clamped with a jig, and positioning holes 11,
12, so the split casing 1,
Even if the bearing parts 3 and 4 are individually machined on the split casings 1 and 2, when assembling the split casings 1 and 2, the bearing parts 3, 4 can be located coaxially.

FIG. 3 shows a sectional view of an automatic transmission to which the present invention is applied, in which a rotating member 23, which is a count gear, is mounted on an output shaft 22 of a main transmission mechanism 21, and a bearing 2 is attached to the output shaft 22 of a main transmission mechanism 21.
It is supported by the bearing parts 3 and 4 of the split casings 1 and 2 via 5 and 26. In this case, if the rotating member 23 is assembled to the bearing parts 3, 4 of the divided casings 1, 2 and then the divided casings 1, 2 are attempted to be assembled, a jig is required during assembly, making positioning difficult. When assembling the split casings 1 and 2, the bearing parts 3 and 4 of the split casings 1 and 2 can be positioned coaxially by simply aligning the bored positioning holes 11 and 12. A split casing in which the bearing parts 3 and 4 can be made coaxial can be obtained. Further, even when disassembled and reassembled for repair, the assembly can be performed with high accuracy without requiring any jigs.

[Brief explanation of drawings]

FIG. 1 is a side view of the casing of an automatic transmission to which the present invention is applied, viewed from the rear cover side, and FIG. 2 is a diagram for explaining one embodiment of the method of machining positioning holes for connection of split casings of the present invention. and the first
FIG. 3 is a sectional view taken along line A-A in the figure, and FIG. 3 is a sectional view of an automatic transmission to which the present invention is applied. 1, 2... Divided casing, 3, 4... Bearing portion, 5, 6... Jig, 11, 12... Positioning hole for connection.

Claims (1)

[Scope of Claims] 1. A method for machining positioning holes for connecting divided casings each having a coaxial bearing portion for supporting a rotating member, comprising: machining a bearing diameter in each of the casings; There are two steps: a step of joining the bearing portion in position and clamping the bearing portion with a jig from inside the bearing portion, a step of temporarily tightening each of the clamped divided casings to position them coaxially, and a step of joining and positioning the divided casings. A method for drilling a positioning hole for connecting split casings, the method comprising the step of drilling a positioning hole in the above locations for communication between the two. 2. The method of machining a positioning hole for connection in a divided casing according to claim 1, wherein the divided casing is a casing of an automatic transmission for a vehicle.