US3765202A

US3765202A - Die roll apparatus for internal gears

Info

Publication number: US3765202A
Application number: US00180004A
Authority: US
Inventors: O Bauknecht; A Horl
Original assignee: ZF Friedrichshafen AG
Current assignee: ZF Friedrichshafen AG
Priority date: 1970-09-24
Filing date: 1971-09-13
Publication date: 1973-10-16
Anticipated expiration: 1990-10-16
Also published as: CH540736A; GB1356597A; DE2047037B2; FR2106225A5; DE2047037C3; DE2047037A1

Abstract

A floating mount for internal gears is provided which holds the gears against a die roll gear that smooths and chamfers the teeth. The die roll gear operates inside the internal gear which is pressed against it by one or more freely rotative pressure wheels engaging its exterior periphery and force feeding it against the die roll gear as the die roll gear is rotated by power means. An adjustable holding member is disposed against one radial face of the internal gear to limit axial movement and support it against axial stress while the other radial face is slidably supported on a surface encompassing the die roll gear.

Description

United States Patent [191 Baukneclit et a1.

[ DIE ROLL APPARATUS FOR INTERNAL GEARS [75] Inventors: Otto Bauknecht; Adolf Horl, both of Friedrichshafen, Germany [73] Assignee: Zahnradfabrik Friedrichshafen Aktiengesellschatt, Friedrichshafen, Germany [22] Filed: Sept. 13, 1971 [21] Appl. No.: 180,004

[30] Foreign Application Priority Data Sept. 24, 1970 Germany P 20 47 037.5

[52] U.S. Cl; 72/94, 72/105, 72/109 [51] Int. Cl. B21h 5/02 [58] Field of Search 72/94, 106, 110,

[56] References Cited UNITED STATES PATENTS 309,082 12/1884 Munton 72/109 1 Oct. 16, 1973 Primary Examiner-Lowell A. Larson Attorney-Zalkind, Home &'Shuster [57] ABSTRACT A floating mount for internal gears is provided which holds the gears against a die roll gear that smooths and chamfers the teeth. The die roll gear operates inside the internal gear which is pressed against it by one or more freely rotative pressure wheels engaging its exterior periphery and force feeding it against the die roll gear as the die roll gear is rotated by power means. An adjustable holding member is disposed against one radial face of the internal gear to limit axial movement and support it against axial stress while the other radial face is slidably supported on a surface encompassing the die roll gear.

8 Claims, 4 Drawing Figures PATENTEDUCT 1 5197s INVENTORS Otto Bauknech' Adolf Hb'rl ATTORNEY Z/AXAQWMM 1 DIE ROLL APPARATUS FOR INTERNAL GEARS The invention is an improvement on the previously filed patent copending application of the same assignee, invented by Bauknecht et al., Ser. No. 141,708, filed May 10, 1971 for Apparatus and Method Finishing Gear Teeth. In the previously filed application there is described an apparatus and method of smoothing the flanks of external gear teeth and chamfering the corners, in which a die roll gear, Le, a tool gear is power rotated in engagement with a spur gear, i.e., a work gear, and a roller means for effecting pressure on the tool gear is utilized for progressively increasing feed engagement by a hydraulic power apparatus as the gears roll in engagement with each other. Various modifications are shown in the prior application, but essentially the die roll gear is power rotated and is wider across the tooth flank than the work gear. The die roll gear is made up of a central guide gear to which chamfering gears are fastened on either side. The previous application is relied on to show details not shown in the present application.

The present invention relates to the finishing that is smoothing, deburring and chamfering of internal gears which present problems not present in performing such an operation on externally toothed gears.

Such problems have been solved in a novel and simple manner in the present instance by providing a mount for the work gear comprising a surface on which a radial face of the work gear rests and can slide radially.into progressive tooth engagement with a die roll gear rotated by power and disposed inside the work gear. A holder member is adjustable so as to be engageable with the opposite radial face of the work gear in order to prevent axial displacement. By providing a feed pressure against the periphery of the work gear via one or more pressure feed rollers, progressive tooth engagement is effected.

A detailed description of the invention now follows in conjunction with the appended drawing in which:

FIG. 1 illustrates in elevational partial cross-section the essential elements of an apparatus for carrying out the invention utilizing a single pressure roller;

FIG. 1(a) shows an adjusting device which may be of any conventional nature but which controls the positioning of a work gear.

FIG. 2 shows a modified arrangement using a pair of pressure rollers; and

FIG. 3 is a view essentially as shown in FIG. 1 except that the die roll gear is a single integral tool gear.

Referring now to FIG. 1, the apparatus comprises a base 7 carrying a power rotated shaft 4 having a chuck 6 for holding a composite die roll gear comprised of guide gear 1 flanked by

chamfer gears

2 and 3 secured as an integral unit, all as heretofore described in the previously filed application.

The guide roll gear extends upwardly from the chuck which presents a top bearing surface for sliding support of an internal work gear 10.

The lower radial face of the work gear thus rests on the chuck, or for that matter, on any other suitably rigid surface while the upper radial surface of the work gear is engageable by a holder member 16 in the form of a cylindrical cup and which is vertically and horizontally adjustable as by any suitable adjusting means K which may be of completely conventional construction.

The adjustment is such that sliding clearance between the bottom edge of member 16 and the upper face of the work gear is provided so as not to cause any clamping of the work gear. However, the presence of the member 16 will prevent any axial displacement of the work gear to any significant degree and will support axial stresses in order to insure proper engagement with the chamfering rolls and symmetrical chamfering.

A large pressure feed roller 12 is mounted freely rotative on a slide 5 and disposed to bear on the outer surface 11 of work gear 10 at a point which will be understood to effect a radial pressure against the engaged teeth of the tool or die roll gear and the work gear. From a geometric standpoint, the point of tangency of pressure roller 12 with the work gear would be in a radial plane with the engaging teeth at the point of greatest engagement, as will be apparent to persons skilled in the machine design arts.

The pressure roller 12 is journaled to be freely rotated on the slide 5 as the roller bears against the work gear rotated by the tool gear. Slide 5 is guided in tracks 9 on base plate 7. The slide is power reciprocated by piston rod 17 of hydraulic motor piston 8 in a well known manner and in a general construction as described in the previously filed application.

Thus, as the die roll gear is power rotated by means of shaft 4, the roller 12 bears against the work gear periphery to progressively increase engagement in order to produce a fully finished smoothing and chamfering operation. The work gear is thus seen as being slidably carried, i.e., having a floating mount but restrained from moving in any direction except that required for the finishing operation.

Any conventional bi-planar adjustable mechanism K may be used which will be understood to be fixed to ground or to the base plate 7 and adjustments may be made during the course of an operation as necessary by simple hand screws or the like.

Referring now to FIG. 2, the previous arrangement is modified only to the extent of providing a pair of

rollers

14 and 15 carried by a yoke 13 and disposed at equal angles with respect to the radial plane that bisects the angle of tooth engagement. Yoke 13 is reversibly movable as by the hydraulic system described in FIG. 1 and as indicated by the double headed arrow in FIG. 2.

FIG. 3 is a section similar to FIG. 1, the difference being that the die roll gear 1A is made of a single integral gear rather than by a composite gear as described in FIG. 1, to engage work gear 10A and having greater width so as to extend at both sides as shown.

We claim:

1. A die roll apparatus for finishing internal gear teeth comprising a power rotated chuck for a die roll gear and a support member for slidably supporting the radial face of an internal gear in mesh with a die roll gear disposed internally of said internal gear and rotated by said chuck;

pressure roller means disposed to engage the exterior of the said internal gear to feed said gear in sliding movement on said support member into said die roll gear while said die roll gear is rotating;

and means disposed to be engageable with the opposite radial face of said internal gear to limit axial displacement thereof while sliding on said support member and being worked by said die roll gear.

2. A die roll apparatus as set forth in claim 1, including a die roll gear comprising a guide gear and chamfering gears secured to the sides thereof, the composite being wider than an internal gear to be worked.

3. A die roll apparatus as set forth in claim 1, including a die roll having a tooth width greater than that of an internal gear to be worked thereby.

4. A die roll apparatus as set forth in claim 1, said pressure roller means comprising a rotatively mounted pressure roller disposed to exert pressure against said internal gear exteriorly thereof and means carrying said roller to exert tooth engaging force on said internal gear to effect working of the teeth thereof by said die roll gear.

5. A die roll apparatus as set forth in claim 1, and said pressure roller means comprising a pair of spaced rollers disposed to exert pressure against said internal gear exteriorly thereof and means carrying said rollers to exert tooth engaging force on said internal gear to effect working of the teeth thereof by said die roll gear.

6. A die roll apparatus as set forth in claim 1, said pressure roller means being disposed to exert radial force on said work gear at equal angles to a plane bisecting the angle of tooth engagement of said work gear and said die roll gear.

7. A die roll apparatus as set forth in claim 1, said means disposed to be engageable with the opposite radial face of said internal gear to limit axial displacement comprising a member having a surface engageable with said opposite radial face of said internal gear and adjusting means to locate said member surface relative to said gear face with clearance to permit sliding of said internal gear while being worked.

8. A die roll apparatus as set forth in claim 1, and said pressure roller means comprising at least one freely rotative pressure roller disposed to exert tooth engaging force against said internal gear exteriorly thereof; and reciprocal means carrying said roller to exert said tooth engaging force by progressive linear movement.

* II i

Claims

1. A die roll apparatus for finishing internal gear teeth comprising a power rotated chuck for a die roll gear and a support member for slidably supporting the radial face of an internal gear in mesh with a die roll gear disposed internally of said internal gear and rotated by said chuck; pressure roller means disposed to engage the exterior of the said internal gear to feed said gear in sliding movement on said support member into said die roll gear while said die roll gear is rotating; and means disposed to be engageable with the opposite radial face of said internal gear to limit axial displacement thereof while sliding on said support member and being worked by said die roll gear.