CN86101932A

CN86101932A - The method of manufacturing gear strip

Info

Publication number: CN86101932A
Application number: CN86101932A
Authority: CN
Inventors: 安斯加·比茨
Original assignee: Zehnradfabrick Friedrichshafen AG
Current assignee: Zehnradfabrick Friedrichshafen AG; ZF Friedrichshafen AG
Priority date: 1985-01-29
Filing date: 1986-03-25
Publication date: 1986-10-15

Abstract

A kind of tooth bar, the tooth bar in the auto steerer specifically is the tooth bar blank (1) that section is sub-circular at least to be carried out ELEMENTARY INTRODUCTION TO NON make.Add man-hour, with the surplus material outwards extrusion from the side of blank (1) tooth portion, and form broadening part (2,3), thereby tooth portion is broadened.The back section of tooth bar is processed near round shape at least.This radius of a circle (R ²) greater than the radius (R of blank ¹).

Description

The method of manufacturing gear strip

The present invention relates to a kind of process of making tooth bar, specifically, is a kind of tooth bar that is used for auto steerer, and this method is that the tooth bar blank of pairing approximation circular cross section carries out ELEMENTARY INTRODUCTION TO NON.Also relate to the tooth bar of making after this.

Equipment to the process of making tooth bar in DE-OS 32 02 254 illustrates.Described process is that tooth bar is carried out pressure processing, is about to the tooth bar blank and is positioned in the forcing press, carries out the cold forming pressure processing by a patrix and a counterdie, adds man-hour, and the pressing mold on the blank can produce a kind of oscillating motion.Be relatively shorter the process time of this manufacture method, also very low to the requirement of material.The method tooth bar bottom or the back of making is Y-shaped thus.In transfer, tooth bar is supported on the supporting plate with this position.Because Y-shaped, thereby tooth bar can be supported on this supporting plate well, yet but can not rotate around its longitudinal axis.This just means, if when having gap, processing inaccuracy position or bending moment, tooth bar and and its meshed gears between the engagement situation, be jiggly sometimes.

People are known, and in multiple rack steering mechanism, the back of tooth bar is a circular cross section.The advantage of this tooth bar is that it can promptly in the supporting plate, rotate around its longitudinal axis at its guided bearing spare, so just can be positioned at the tooth portion of pinion exactly.For the tooth portion that makes this tooth bar has bigger width, just quite a few of circle cross section blank must be cut.Like this, if tooth portion is near more from the section center of tooth bar, then tooth portion is also wide more, and this is to the transmission of steering force, and the power (sliding friction, tooth bar is tumbled) and the tooth bar that produce during to engagement have very big meaning around the ability to bear of its rotating torque.But near the center of section, the bending strength of tooth bar is just low more more in tooth portion, and this does not allow the weak spot that exists with forming concerning the very big transfer that is lambdoid track rod of intensity is installed.Like this, people just have among above-mentioned two kinds of extreme cases, make a kind of often also not satisfied compromise, and cause can producing noise rattly in the transfer owing to tooth portion is wide inadequately.Because tooth portion, people also often have to select for use than the much bigger bar of the desired diameter of tooth bar.For this reason, so well-known, the tooth bar of Y shape section is still using, its manufacture method, for example can be as above-mentioned, whether the operational circumstances of Y shape section tooth bar is intact, depends on the manufacturing tolerance of tooth bar guided bearing spare (supporting plate) and transfer housing to a great extent.

So, the objective of the invention is to propose a kind of tooth bar and a kind of process of making tooth bar, this tooth bar can create with simple method, and power and the moment that occurs had high intensity, and be insensitive, the steering force that when operation occurred particularly, the power of tooth portion and bending force and be insensitive around the turning torque of its longitudinal axis.These power and moment are owing to there being manufacturing tolerance to produce.

According to the present invention, these purposes reach like this, promptly do not mill the surplus material at the tooth portion place of circle cross section tooth bar raw material, but the method by the chipless moulding is wide to external pressure from the side, so just can make the width increasing of tooth portion, and the section configuration at tooth bar back approaches circular at least.

The manufacturing process that proposes according to the present invention can outwards be rolled the tooth portion surplus material on the tooth bar blank, thereby realized ELEMENTARY INTRODUCTION TO NON.Also have, because the bearing-surface broad, thereby tooth bar promptly can allow its tooth portion be supported on the pinion.So just, can remove slide block, the size of tooth bar itself also needn't be very big.In addition, it is round that the back of tooth bar is still, and so just can realize good guiding in supporting plate, and have suitable cooperation, because bearing-surface increases, tooth bar just has bigger bearing capacity, and the noise of generation is less.

Another preferred version of the present invention is the radius that makes the circular portion of tooth bar, than the radius of blank and (or) radius of tooth bar supporting end is big.The semicircle center of circle of circular portion is positioned at the top in tooth bar axle center.

This design can form bigger slide surface on supporting plate, this means, corresponding surface pressing is just less, can stop tooth bar to produce excessive inclination in addition, because when producing this situation, tooth bar just will more make progress near pinion, like this, because lever arm of force diminishes, thereby the effect of the frictional force of tooth bar rotation has also been diminished.

If tooth portion is carried out ELEMENTARY INTRODUCTION TO NON equally, that is favourable, in case of necessity, the tooth bar blank can be made tooth bar with an operation sequence.

In category of the present invention, can make tooth bar with multiple ELEMENTARY INTRODUCTION TO NON technology, as the forge hot method, and the cold deformation technology of band swing mould.

Be an embodiment of the present invention below, and with the description of drawings principle.

Be represented by dotted lines part among the tooth bar blank 1(figure) can be that the circular bar of R1 is as the raw material manufacturing by a kind of radius.Through after the ELEMENTARY INTRODUCTION TO NON, the tooth bar blank can be processed into tooth bar with suitable mould (have two, have opposite shape) with tooth bar to be processed.The unshowned die joint of two moulds will be determined according to applicable cases.Generally, people make the moulding of tooth portion with a mould, make the back shape of tooth bar with the another one mould.

In forming process, the material of tooth bar blank can be depressed from above, and outwards extrudes from the side, so just forms broadening part 2 and 3 in both sides, and its width has exceeded radius R 1.This broadening part is positioned at tooth portion 4, and promptly rack teeth will extend in two broadening parts 2 and 3, and tooth portion 4 is obviously widened.

Right half part shows a kind of processing mode among the figure: the bottom radius of tooth bar blank still is R1, and promptly the back 5 of tooth bar still keeps circular or is similar to circle at least.Like this, just, the transition region between back 5 and broadening part 3 forms a rib.

Left-half shows another kind of processing mode among the figure: except broadening part 2, also protrude a part of material (being shown in dotted line) at tooth portion 4 positions, the radius R 2 at the back that forms 5 is greater than raw-material radius R 1.This shows that the center of circle M of radius R 2 is higher than tooth bar axle center 6.So just, in supporting plate 7(figure, be represented by dotted lines) the last bigger sliding surface that forms.Have, when tooth bar was tumbled, tooth bar can be raised and more close pinion again.In other words, tooth bar to be supported on rack axis 6(be the center of circle of radius R 1) be in the bearing at center.And tooth bar then can only rotate around the center of circle of radius R 2 M when being arranged in supporting plate 7.This just means that when tooth bar rotates, tooth portion will upwards lift, thereby the end play of supporting plate is diminished, and meanwhile noise can diminish.

In process, must note stoping the material of tooth bar blank 1 longitudinally to flow with suitable baffle plate.So just, can make the surplus of material minimum, simultaneously, also can be in process, force material only can directly flow in the tooth portion with negative shape of patrix and go.So just, can avoid occurring the folding phenomenon and because the phenomenon that the mobile drafts that causes of material increases of material.

Can know from illustrated two kinds of processing modes and to find out that in the embodiment shown in right-hand, the cross section at back is a semicircle, with its adjacency be broadening part 3.At left, the radius R 2 at back 5 is bigger, thereby the circumference at back can join smoothly with broadening part 2.Like this, just, can make tooth bar have bigger bearing capacity.

Claims

1, a kind of process of making tooth bar, specifically, it is a kind of tooth bar in the auto steerer, it is the process of the tooth bar blank that is at least the sub-circular section being carried out ELEMENTARY INTRODUCTION TO NON, it is characterized by: make the surplus material at blank (1) tooth portion (4) position, outwards extrude and form broadening part (2,3) from the side, make tooth portion broadening thus, and make the cross section at tooth bar back (5) be similar to circle at least.

2, the process that proposes according to claim 1, it is characterized by: the circle that processes, radius be (R2), it than blank and (or) radius (R1) of the supported end of tooth bar greatly, the center of circle (M) of radius (R2) is positioned on the tooth bar axle center (6).

3, according to claim 1 or 2 processes that propose, it is characterized by: in same process, also can tooth portion (4) be processed with the method for ELEMENTARY INTRODUCTION TO NON.

4, according to the process of a proposition among the claim 1-3, it is characterized by: tooth bar can be processed with the cold deformation method with a mould of doing oscillating motion.

5, a kind of tooth bar, the tooth bar in the auto steerer specifically, be that the tooth bar blank that is at least the sub-circular section is carried out ELEMENTARY INTRODUCTION TO NON is produced, it is characterized by: tooth portion (4) one sides in tooth bar or blank (1) radius (R1) top, be processed with a broadening part (2,3), thus tooth portion is widened; The section at the tooth bar back (5) after the processing is near round shape at least.

6, the tooth bar that proposes according to claim 5 is characterized by: this radius of a circle (R2) greater than blank and (or) radius (R1) of tooth bar supporting end, the center of circle (M) of radius (R2) is positioned on the tooth bar axle center (6).

7, the tooth bars that propose according to claim 5 or 6 is characterized by: the section semicircular in shape of back (5), and be connected with broadening part (3).

8, according to claim 5 or 6 tooth bars that propose, it is characterized by: this semicircle and broadening part (2) smooth connection.