JPH0518011Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a gear chamfering device, and relates to a gear chamfering device that is capable of chamfering workpiece gears having the same module without changing the chamfering cutter.

(Prior Art) Generally, after gear cutting, a workpiece gear is chamfered at its tooth end. Chamfering is performed by rotating a chamfer cutter having a gear-shaped blade on its outer periphery that can mesh with the work gear. Japanese Utility Model Application Publication No. 56-15620 discloses an example of a device for performing such chamfering,
The cutter shaft that rotatably supports the chamfering cutter and the workpiece shaft that supports the workpiece gear are arranged in parallel, and by bringing both shafts relatively close together, the chamfering cutter is meshed with the workpiece gear, and then the workpiece gear is The tooth end of the work gear is chamfered by rolling pressure by rotating the gear. In such conventional chamfering devices, chamfering of workpiece gears having different numbers of teeth is performed using different chamfering cutters for each number of teeth.

(Problem to be solved by the invention) In this way, it is necessary to change the chamfering cutter for each different number of teeth, so if the same machine is used to chamfer workpiece gears with different numbers of teeth, the cutter A problem arises in that the number of replacements increases, which increases the work time and effort required for chamfering work.

In addition, for example, in the countershaft of an automobile transmission, one gear always has the same diameter and the same module, and another gear may have the same module and only the diameter changes, but conventionally With this chamfering device, it was necessary to replace the chamfer cutter for each gear.

This invention was made in view of these points,
It is an object of the present invention to provide a gear chamfering device capable of chamfering workpiece gears having different numbers of teeth so that the number of replacements of cutters can be reduced as much as possible.

(Means for solving the problem) The present invention is capable of chamfering workpiece gears using the same chamfer cutter even if the number of teeth on the workpiece gears is different, as long as the modules are the same. It was developed with this in mind, and has the following structure.

That is, the gear chamfering device of the present invention includes a workpiece support means that supports a gear-cut workpiece gear and drives it to rotate about its rotational axis, and a workpiece gear that is parallel to the rotational axis of the workpiece gear supported by the workpiece support means. a coaxial cutter that supports a gear-shaped first chamfered cutter so as to be coaxial with the axial center of the cutter shaft and rotatable about the axial center; and an eccentric support portion rotatably supporting the gear-shaped second chamfer cutter at an eccentric position with respect to the axis of the cutter shaft and in an adjustable eccentric direction, and the workpiece supporting means The first cutter gear and the second cutter gear are meshed with each of a plurality of workpiece gears supported by the workpiece gear, and the tooth end of the workpiece gear is chamfered by rolling pressure while the cutter gear is driven by the workpiece gear. It is characterized by being familiar.

(Function) In the chamfering device configured as described above, the eccentric support portion on the cutter shaft performs the same chamfering on the workpiece gears 1 and 3 having the same module and different numbers of teeth, as shown in Fig. 1. The cutter 5 performs chamfering. That is, for the work gear 1 with a smaller diameter, as shown in FIG. 1A,
The rotational position of the cutter shaft 9 is determined so that the distance Y between the centers of the workpiece gear and the eccentric shaft portion 7 becomes small. As a result, the work gear 1 and the cutter 5 are brought into mesh with each other, and the cutter 5 chamfers the work gear 1. On the other hand, for the workpiece gear 3 with a larger diameter, the cutter shaft 9 is fixed at a position rotated 90° counterclockwise from the position shown in FIG. 1A, for example, and the state shown in FIG. 1B is set. Eggplant. As a result, the distance between the centers of the workpiece gear 3 and the cutter 5 becomes a large value Y', and the two become in a positional relationship that allows them to mesh. Therefore, the same cutter 5 used for the work gear 1 can be used to chamfer the work gear 3.

In addition, in the coaxial support part, the cutter gear can be used as is, so for workpieces where one gear is the same and the other gears are of the same module with different diameters, the cutter gear can be used as is. Chamfering can be performed only by adjusting the eccentric direction without having to replace the

(Example) An example of the present invention will be described below with reference to the drawings.

FIG. 2 is a diagram showing an embodiment of the present invention. In the figure, 11 is an arm having an L-shape as a whole, and the tip thereof is a hanging part 13 that hangs downward.
A cutter shaft 17 is supported horizontally between this hanging portion 13 and an arm side wall 15 facing thereto. This cutter shaft 17 rotatably supports two gear-shaped chamfered cutters 19 and 21 at a constant interval. Below the cutter shaft 17, a support section for supporting the workpiece 23 parallel to the cutter shaft is constituted by an arm side wall 27 and a vertical arm 29 facing the arm side wall 27. To be more specific, the chamfering device of this example is for chamfering a gear group integrally formed with a countershaft constituting a transmission of an automobile or the like. Therefore, the above-mentioned support part is the support member 2 that supports the workpiece, that is, the countershaft 23 from both ends thereof.
5a and 25b, one support member 25a rotatably supports the workpiece 23, and the other support member 25a supports the workpiece 23 rotatably.
5b is connected to a motor (not shown), and the workpiece 2
3 is rotated around its axis 23a. 31, the work 23 is attached to the support member 2 mentioned above.
It is a loader to be installed between 5a and 25b, and the horizontal arm 3 supported by the vertical arm 31a.
A clamper 31c that grips the workpiece 23 is provided at the tip of the horizontal arm 31b, and the workpiece 23 in the magazine 31d is held by the support member by vertical rotation of the horizontal arm 31b and horizontal expansion/contraction operation of the horizontal arm 31b. It is carried between 25a and 25b. On the other hand, 33 is a deburring roller, which supports the workpieces 25a and 25b.
It is disposed opposite to the loader with the chamfering cutters 19 and 21 in between, and removes burrs generated at the tooth end of the gear of the workpiece 23 after chamfering is completed by the chamfering cutters 19 and 21.

FIG. 3 is a diagram showing the structure of the cutter shaft 17 described above. The cutter shaft 17 is rotatably supported between the hanging portion 13 and the side wall 15. One chamfer cutter 19 is attached to a holder 37 via a bearing 35 and is rotatably supported by the cutter shaft 17. The rotation center of this cutter 19 and the cutter axis 17a are the same. However, the other cutter 21 is supported by a holder 43 attached to the cutter shaft 17 via a collar 39 and a bearing 41, and the collar 39 moves the rotation center 21a of the cutter 21 from the axis 17a to e. It is in an eccentric state. That is, the collar 39 forms an eccentric shaft portion on the cutter shaft 17, and the cutter 21 is rotatably supported there. Next, a hexagonal head 17b is formed at the tip of the cutter shaft 17 on the side supported by the hanging portion 13, and a hexagonal head 17b is formed for indexing the rotational position of the cutter shaft 17. A protrusion 17c for rotating the cutter shaft 17 is formed in the support hole 1 of the cutter shaft 17, which is formed in the hanging portion 13.
3a, a hexagonal cross section 17 having the same shape as the hexagonal head 17b is provided at the part of the cutter shaft located within 3a.
d is formed. The shaft center 17a of the cutter shaft 17 is located in the support hole 13a where this cross-sectional portion 17d is located.
A hole 13b having an axis extending horizontally through the hole 13b is bored, and a bolt 45 that can come into contact with the hexagonal cross section 17d is screwed into the hole 13b. That is, when this bolt 41 is tightened, its tip comes into pressure contact with the outer peripheral surface of the hexagonal cross section 17d of the cutter shaft, thereby fixing the rotational position of the cutter shaft. In this way, the bolt 45 functions as a rotation regulating member.

In this example configured in this way, the loader 3
1, a counter shaft (work) 23 is supported between support members 25a and 25b, for example,
As shown in FIG.
It is said that it is in a screwed state. Thereafter, the countershaft 23 is rotated by the motor via the support member 25b. Since both the cutters 19 and 21 are rotatably supported by the cutter shaft 17, the gears 23b and 2
3c, and while this screwing rotation is being performed, the cutters 19 and 21 chamfer the tooth ends of the gears 23b and 23c.
When using the chamfering cutter 21 to chamfer a gear having the same module as the gear 23c but a different number of teeth, the bolt 45 is loosened to allow the cutter shaft 17 to rotate. After that, if the gear to be chamfered has more teeth than the gear 23c, that is, if the diameter is larger, the cutter shaft 17 is moved in the direction of increasing the distance between the rotation center 21a of the cutter 21 and the center 23a of the gear. Rotate. After the desired distance is obtained, the bolt 45 is tightened again to fix the cutter shaft 17. As a result, the cutter 21 and the large-diameter gear can be brought into mesh with each other, so that chamfering can be performed. Contrary to the above, the gear has fewer teeth than gear 23c (smaller diameter)
In this case, the cutter shaft 17 is rotated in a direction that reduces the distance between the centers 21a and 23a. In this way, depending on the value of the eccentricity e, the centers 21a, 23a
Therefore, the chamfer of gears with different numbers of teeth can be changed accordingly.
This can be done using the same cutter 21.

(Effects of the invention) As explained above, according to the invention, an eccentric shaft is formed on the cutter shaft, a chamfered cutter is rotatably attached to the eccentric shaft, and the cutter shaft is attached to the cutter shaft with the center of the cutter shaft. It can be rotated around the
Since it can be fixed at a predetermined rotational position, the distance between the axis of the eccentric shaft portion, that is, the rotation center of the chamfering cutter, and the center of the workpiece gear can be changed depending on the rotational position of the cutter shaft. Therefore, by changing this distance between centers, it is possible to chamfer workpiece gears with the same module but different numbers of teeth using the same chamfering cutter, and the workpiece gears can be chamfered with the same module but with different numbers of teeth. Since it is no longer necessary to replace the cutter each time the number of teeth changes, the number of times the cutter is replaced can be reduced, and workpiece gears with different numbers of teeth can be chamfered efficiently in a short time.

[Brief explanation of drawings]

Figures 1A and B are explanatory diagrams showing the operating principle of the present invention, Figures 2A and B are elevational views and side views showing one embodiment of the invention, and Figures 3A and B are illustrations of the second embodiment.
FIG. 2 is an elevational view and a side view showing the detailed structure of the cutter shaft shown in the figure. 17...Katsuta shaft, 19, 21...Katsuta, 2
1a... Center of rotation, 23... Workpiece, 23a...
Axial center, 23b, 23c...gear, 25a, 25b
... Support member, 39 ... Collar, 45 ... Bolt (rotation regulating member), e ... Eccentricity.

Claims (1)

[Scope of utility model registration request] A workpiece support means that supports a cut workpiece gear and drives the workpiece gear to rotate around its rotational axis, and a cutter shaft that is arranged parallel to the rotational axis of the workpiece gear supported by the workpiece support means, The cutter shaft includes a coaxial support portion that supports a gear-shaped first chamfered cutter so as to be coaxial with the axis of the cutter shaft and rotatable around the axis, and a coaxial support portion that supports the first chamfered cutter that is coaxial with the axis of the cutter shaft and rotatable around the axis; and an eccentric support section rotatably supporting a gear-shaped second chamfer cutter at an eccentric position and in an adjustable eccentric direction, each of the plurality of workpiece gears supported by the workpiece support means. Gear chamfering characterized in that the first cutter gear and the second cutter gear are engaged with each other, and the tooth end of the workpiece gear is chamfered by rolling pressure while driving the cutter gear by the workpiece gear. Device.