CN101334090A - Worm-gear device and its making method - Google Patents
Worm-gear device and its making method Download PDFInfo
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- CN101334090A CN101334090A CNA2007101095988A CN200710109598A CN101334090A CN 101334090 A CN101334090 A CN 101334090A CN A2007101095988 A CNA2007101095988 A CN A2007101095988A CN 200710109598 A CN200710109598 A CN 200710109598A CN 101334090 A CN101334090 A CN 101334090A
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Abstract
The invention provides a worm wheel device through the discovery of the allowable error of a worm shaft corresponding to the maximal meshed position of a worm wheel, wherein, the allowable error is larger than that of the maximal meshed position of the worm wheel of a traditional worm wheel device.
Description
Technical field
The present invention relates generally to a kind of gear and manufacture method thereof that comprises intermeshing modiolus and worm gear, relate more particularly to a kind of Niemann type gear and manufacture method thereof.Niemann type gear comprises Niemann type modiolus and Niemann type worm gear.
Background technique
Up to now proposed multiple gear, and they come into operation in field of motor vehicles particularly.Gear only is called " worm gear " sometimes.
Day disclosure utility model application (Jikkaihei) 4-562 discloses one of worm gear in 50.The gear that shows in the open text is the Niemann type, and it comprises that operation in use engages or the Niemann type modiolus and the Niemann type worm gear of engagement.Such modiolus and worm gear have continuous rib of arc (or helical tooth ridge) and arc tooth respectively.Because the characteristic of this Niemann type, the continuous rib of gear and tooth have the big facewidth, therefore, the continuous rib and the tooth of Niemann type gear can have the mechanical strength of increase.
Summary of the invention
Yet, this Niemann type modiolus and worm gear arrangement and complex-shaped, therefore, the manufacturing of this modiolus and worm gear needs FA thread cutting technology, causes the expensive product of gear thus.
Therefore, the object of the present invention is to provide a kind of Niemann type gear, it has gratifying mechanical strength, and can make under the situation that need not FA thread cutting technology.
Another object of the present invention is to provide a kind of method of making this gear.
According to first purpose of the present invention, a kind of gear is provided, it comprises: worm gear, this worm gear has the tooth around its spaced at equal intervals, each tooth of this worm gear has the circular protrusions outer surface in each side, each groove that is defined by two adjacent teeth of worm gear has curved bottom, and this bottom has first curvature radius; And modiolus, this modiolus has the helical tooth ridge, this helical tooth ridge has the circular recess outer surface on each side, the tooth of this helical tooth ridge and worm gear engagement and have radius of second curvature less than first curvature radius, wherein, engagement between each tooth of worm gear and the helical tooth ridge of modiolus is represented by first characteristic line of describing in the performance plot, described performance plot has shown that modiolus is vertically with respect to the relation between the radius ratio between the permissible error of the maximum engagement position of worm gear and first curvature radius and the radius of second curvature, wherein represent by second characteristic line in the described performance plot with reference to each tooth of worm gear and with reference to the engagement between the helical tooth ridge of modiolus, each tooth with reference to worm gear has flat outer surface in each side, has flat outer surface with reference to the helical tooth ridge of modiolus in each side; Wherein first characteristic line in the performance plot and second characteristic line intersect at the set point place; And wherein, engagement between each tooth of worm gear and the helical tooth ridge of modiolus conforms to the part of first characteristic line, this part is drawn when radius ratio is equal to or greater than a predetermined value, and described predetermined value is represented or corresponding to the crossing set point of first and second characteristic lines.
According to a second aspect of the invention, provide a kind of method of making the worm gear that is meshed with modiolus, described modiolus has the helical tooth ridge, and described helical tooth ridge has the circular recess outer surface in each side, and described method comprises: prepare plectane embryo spare; With the cylindrical peripheral part of cutting plectane embryo spare to make the tooth of spaced at equal intervals around it, described each tooth has the circular protrusions outer surface in each side, described circular protrusions outer surface is configured as when forming correct the cooperation between modiolus and the worm gear with the circular recess intimate of the helical tooth ridge of modiolus and engages, wherein, the radius of curvature of the curved bottom of each groove that is defined by two adjacent teeth of worm gear is greater than the radius of curvature of the helical tooth ridge of modiolus.
According to a third aspect of the invention we, the method that provides a kind of manufacturing to have the modiolus of helical tooth ridge, described helical tooth ridge has the circular protrusions outer surface in each side, and described method comprises: the cylindrical embryo spare of preparing modiolus; The outer surface of cutting circle cylindricality embryo spare to be forming the helical tooth ridge in its vicinity, thereby makes the semi-finished product modiolus; With the semi-finished product modiolus is carried out surface finish processing, and it is not heat-treated.
Description of drawings
When considered in conjunction with the accompanying drawings, other purposes of the present invention and advantage will become apparent by following description, wherein:
Fig. 1 is the perspective view of motor vehicle electrically powered steering apparatus using same, and in fact gear of the present invention is applied on the described the steering gear;
Fig. 2 is the sectional view of cutting open along Fig. 1 cathetus II-II;
Fig. 3 is the sectional view of cutting open along Fig. 1 cathetus III-III;
Fig. 4 is mounted in the perspective view of the modiolus of the gear of the present invention on the electrically powered steering apparatus using same shown in Figure 1;
Fig. 5 is the amplification view of the part of the modiolus helical tooth ridge cut open along Fig. 4 cathetus V-V (or rib) continuously;
Fig. 6 is and the similar view of Fig. 5 still to have shown the amplification view of traditional modiolus helical tooth ridge;
Fig. 7 is the planimetric map of partly cut-away of the worm gear of gear of the present invention, described worm gear will with the modiolus engagement of Fig. 4;
Fig. 8 is the sectional view of cutting open along Fig. 7 cathetus VIII-VIII;
Fig. 9 is the amplification view of cutting open along Fig. 8 cathetus IX-IX;
The chart of the mechanical strength (that is yield strength) of the worm gear of apparatus of the present invention that Figure 10 is a simple displaying and the worm gear of traditional gear;
Figure 11 is an amplification view, has shown the modiolus of gear of the present invention and the state that the worm gear operation engages;
Figure 12 is an amplification view, has shown the modiolus of gear of the present invention and the engagement details between the worm gear;
Figure 13 A-13D is a schematic representation, has shown the production process of modiolus of gear of the present invention and the production process of traditional modiolus;
Figure 14 is the schematic illustrations perspective view of gear of the present invention, has shown intermeshing modiolus and worm gear;
Figure 15 has shown under the situation of gear of the present invention, the chart of relation between tooth matching angle and the transmitting torque loss;
Figure 16 is and the similar chart of Figure 15 still to have shown the relation under traditional gear situation;
Figure 17 has shown the radius ratio between worm gear radius of curvature " R " and the modiolus radius of curvature " r " and maximum has allowed the chart that concerns between the tooth matching angle therebetween;
Figure 18 has shown under the situation of gear of the present invention, the chart of relation between engaging position and the transmitting torque loss;
Figure 19 is and the similar chart of Figure 18 still to have shown the relation under traditional gear situation; With
Figure 20 has shown the chart that concerns between the permissible error of radius ratio between worm gear radius of curvature " R " and the modiolus radius of curvature " r " and maximum engagement position.
Embodiment
Hereinafter, will describe the present invention by means of accompanying drawing.
For the ease of understanding, used various direction terms in the following description, for example right, left, upper and lower, wait to the right.But this term is only understood according to the accompanying drawing that has shown corresponding part or part.In specification, identical substantially parts or part are represented by identical reference number.
With reference to figure 1-3, shown the electrically powered steering apparatus using same of motor vehicle, in fact gear of the present invention is installed on the described the steering gear.
For the feature that makes gear of the present invention becomes clear, will be briefly described by means of Fig. 1-3 pair electrically powered steering apparatus using same.
As shown in the figure, particularly in Fig. 2 and 3, electrically powered steering apparatus using same comprises electric machine casing 6, worm housing 7, torque sensor 9 and motor 20.
As shown in Figure 2, inside accommodate torque sensor 9 torque sensor housing 5 within it portion support input shafts 1 by bearing 15.Although do not show in the accompanying drawing, input shaft 1 be connected to will steering wheel (not shown) by its driving on, more specifically, by the driver drives of control steering wheel.The worm housing 7 that links to each other with torque sensor housing 5 portion within it supports pinion shaft 2 by bearing 72.
As shown in Figure 3, the electric machine casing 6 that links to each other with worm housing 7 portion's reception within it brushless motor 20.As shown in the drawing, extend the common axis of crossing input shaft 1 and pinion shaft 2 as the modiolus 200 of the output shaft of motor 20.
Refer again to Fig. 2, have the worm gear 100 that tightly fits on it by the torsion bar 3 coaxial pinion shafts 2 that are connected on the input shaft 1.As shown in the figure, worm gear 100 is accommodated in the stepped bottom of worm housing 7.
Shown in Fig. 2 and 3, modiolus 200 is formed with helical tooth ridge 200a (or continuous rib), and it engages or mesh with the tooth 100a operation of worm gear 100 spaced at equal intervals.
As being understandable that from Fig. 2, when the driver applied specific rotating force by steering wheel, input shaft 1 was forced to rotate with respect to pinion shaft 2 around common axis, and torsion bar 3 is reversed.Therefore, torque sensor 9 is sensed the torque that in fact imposes on input shaft 1 and is sent corresponding dtc signal.
As shown in Figure 2, worm gear 100 is connected on the pinion shaft 2 with one heart and closely, and engages with modiolus 200 operations, and described modiolus 200 extends perpendicular to the axis of pinion shaft 2.
As shown in Figure 3, at the electric machine casing 6 inner control circuit assemblies 4 of installing with microcomputer.Control circuit assembly 4 is configured to offer by processing the running of its numerous information signals control motors 20, described information signal for example for the signal of the working state of expression associated motor vehicle, from the dtc signal of torque sensor 9 etc.
As shown in Figure 2, speed probe 8 is installed to detect the rotating speed of modiolus 200 near modiolus 200, that is, and and the rotating speed of motor 20.Speed probe 8 is the magnetic type, and this speed probe calculates the occurrence number of given location in preset time of the helical tooth ridge 200a of modiolus, thereby detects rotating speed.
With reference to figure 4, shown modiolus 200 with helical tooth ridge 200a.Modiolus 200 is made of metal.
Should be noted that in the present invention the helical tooth ridge 200a of modiolus 200 is the Niemann type.
That is to say that as shown in Figure 5, wherein Fig. 5 is the amplification view of the part of the helical tooth ridge 200a that cuts open along Fig. 4 cathetus V-V, helical tooth ridge 200a has the circular recess outer surface in each side, and this outer surface is defined by the circle with radius " C ".Should be noted that as shown in Figure 6, plain edition modiolus 200 ' in, its helical tooth ridge 200 ' b has flat outer surface in each side.
Therefore, as from Fig. 5 and 6, being understandable that, under identical pitch, the tooth root width " Sf " of Niemann type helical tooth ridge 200a is greater than the tooth root width " Sf ' " of common helical tooth ridge 200 ' b, and the addendum width " Sa " of Niemann type helical tooth ridge 200a is less than the addendum width " Sa ' " of common helical tooth ridge 200 ' b.
As hereinafter describing in detail, the surface finish of modiolus 200 realizes by texturing processing.Utilize this surface finish processing, the outer surface of helical tooth ridge 200a becomes smooth, and therefore protection is avoided scratch with the outer surface of the tooth 100a of the worm gear 100 of modiolus 200 engagements.
With reference to figure 7, shown the planimetric map of the partly cut-away of worm gear 100.
From Fig. 8 and 9, can understand the structure of worm gear 100 better.Fig. 8 is the sectional view of cutting open along Fig. 7 cathetus VIII-VIII, and Fig. 9 is the amplification view of cutting open along Fig. 8 cathetus IX-IX.
As shown in Figure 9, each tooth of the band ring gear shape vinyl cover 120 of worm gear 100 has circular protrusions outer surface 101 in each side, and it can engage (referring to Figure 12) with the above-mentioned circular recess intimate of the Niemann type helical tooth ridge 200a of modiolus 200.That is to say that worm gear 100 and modiolus 200 constitute so-called Niemann type gear.
As mentioned above, band ring gear female cap 120 is made by the nylon (trade name) with reinforcing fibre not, therefore, and with modiolus 200 engagements the time, band ring gear shape vinyl cover 120 bears resiliently deformable and thermal distortion, its elimination or reduced undesirable backlash of gear at least.In addition, because band ring gear shape vinyl cover 120 does not comprise reinforcing fibre, thereby make the outer surface of the helical tooth ridge 200a of modiolus 200 avoid scratch.
In addition, as shown in Figure 9, because circular protrusions outer surface 101 is set, each tooth of the band ring gear shape vinyl cover 120 of worm gear 100 can have thicker thickness, thereby causes the mechanical strength of worm gear 100 to increase.Therefore, do not comprise reinforcing fibre, can have gratifying mechanical strength yet although should be noted that each tooth of band ring gear shape vinyl cover 120.
This point can be known from the chart of Figure 10 and find out, has wherein shown the mechanical strength (that is yield strength) of worm gear 100 and traditional worm gear.
As shown in Figure 9, each tooth 111 of band ring gear shape metal core 110 stretches into the intermediate portion of the respective teeth of band ring gear shape vinyl cover 120.Utilize this structure, any heat that produces in the tooth 100a of band ring gear shape vinyl cover 120 is by the 110 effective radiation of band ring gear shape metal core, and described metal core 110 is compared with vinyl cover 120 has excellent thermal conductivity.
Hereinafter, will be with reference to Figure 11 and 12 engagements of discussing between worm gear 100 and the modiolus 200, so that make the advantage of the Niemann type gear of the present invention that comprises worm gear 100 and modiolus 200 clearer.
Figure 11 is an amplification view, has shown the modiolus 200 of gear of the present invention and the state that worm gear 100 operations engage, and Figure 12 is an amplification view, has shown the engagement details between modiolus 200 and the worm gear 100.
As from these accompanying drawings, especially from Figure 12, can be clear that, when worm gear 100 and modiolus 200 correct engagement or assembling, the circular recess intimate of the circular protrusions outer surface 101 of each tooth of worm gear 100 and the helical tooth ridge 200a of modiolus 200 and in depth contacting.That is to say, be defined in area of contact between the helical tooth ridge 200a of each tooth of worm gear 100 and modiolus 200 significantly greater than the area of contact between the appropriate section that is defined in traditional gear.Therefore, compare with traditional gear, the bearing stress that produces under the situation according to gear of the present invention is quite little.Therefore, under situation of the present invention, needn't use reinforcing fibre reinforcing band ring gear shape vinyl cover 120.
In Figure 11, the radius of curvature that is defined in each curved slot 102 between two adjacent teeth 100a of worm gear 100 is by " R " expression, and the radius of curvature of the helical tooth ridge 200a of modiolus 200 is represented by " r ".Meshing zone between the helical tooth ridge 200a of each tooth of worm gear 100 and modiolus 200 is represented by " D ".As shown in the figure, when correctly cooperating between worm gear 100 and the modiolus 200, meshing zone " D " has radius of curvature " r ".
Should be noted that in the present invention and have following relationship between " R " and " r ":
R＞r…………(1)
Because the reason than larger radius of curvature " R " of each curved slot 102 of worm gear 100 needn't use FA thread cutting technology to make worm gear 100, therefore, worm gear 100 can be made at lower cost.
As mentioned above, the thickness less (referring to Fig. 5) of the tooth top 211 of the helical tooth ridge 200a of modiolus 200.Therefore, as from Figure 12, being understandable that, even along applying remarkable active force for modiolus 200 with the direction of worm gear 100 inclinations, the frictional force that results between the circular protrusions outer surface 101 of each tooth of the tooth top 211 of helical tooth ridge 200a of modiolus 200 and worm gear 100 is also very little, therefore, 100 transmission of torque is unaffected basically from modiolus 200 to worm gear.
With reference to figure 13A-13D, shown modiolus 200 and traditional modiolus 200 ' manufacture method.
At first, the manufacture method of modiolus 200 of the present invention will be described by means of accompanying drawing.
As shown in FIG. 13A, prepare semi-finished product cylindrical metal member 2000, described member 2000 has cylindrical major component 2000a and the terminal 2000b of spline.Subsequently, shown in Figure 13 B,, major component 2000a provides helical tooth ridge 2000c nearby thereby being carried out cutting.For this cutting method, two cutting tool C1 and C2 have been used.That is to say, as shown in the figure, in order to make helical tooth ridge 2000c, semi-finished product cylindrical member 2000 is rotated with specific speed around its axis, subsequently, the tip is pressed the cutting tool C1 of cylindrical major component 2000a and C2 and is moved along the axis of cylindrical member 2000.Utilize this method, produce so-called semi-finished product modiolus 2000A.
Subsequently, shown in Figure 13 C, the semi-finished product modiolus 2000A that is formed with helical tooth ridge 2000c thus is subjected to parts rollings (component rolling) finishing processing.For this method, two polishing roll R1 and R2 have been used.That is to say, use so-called roller polishing method.Utilize this method for finishing, provide modiolus finished product 200, as shown in the figure.
Should be noted that in the present invention semi-finished product modiolus 2000A carries out parts rolling finishing processing immediately under the situation of not heat-treating.
As shown in Figure 13 B and 13D, make traditional modiolus 200 ' situation under, 2000A heat-treats to the semi-finished product modiolus, polishes processing subsequently.
As mentioned above, in gear according to the present invention, the bearing stress that results between worm gear 100 and the modiolus 200 is minimum, and the load that therefore imposes on modiolus 200 is minimum.Therefore, needn't carry out above-mentioned heat treatment to semi-finished product modiolus 2000A more specifically to modiolus 200.Owing to need not such heat treatment, necessary polishing processing no longer is essential in the present invention when therefore using this heat treatment.
Hereinafter, gear of the present invention will be discussed according to its unique construction.
Figure 14 schematically illustrates the perspective view of gear of the present invention.
The axis " A " that should be noted that modiolus 200 is represented by " θ " with respect to the radially angle of " B " (perhaps tooth matching angle) of worm gear 100.Therefore, when radially " B " of worm gear 100 was consistent with axial " A " of modiolus 200, angle " θ " was shown as 0 (zero) degree.
Shall also be noted that modiolus 200 vertically " A " represent by " y " with respect to the position (will be referred to below the engaging position) of worm gear 100.Therefore, when each tooth 100a of worm gear 100 suitably or fully engaged with the helical tooth ridge 200a of modiolus 200, engaging position " y " was shown as 0 (zero).
For being convenient to purpose of description, hereinafter, the radius of curvature " R " that is defined in each curved slot 102 (referring to Figure 11) between two adjacent teeth of worm gear 100 will be called the radius of curvature " R " of the tooth of worm gear 100, and the radius of curvature " r " of the helical tooth ridge 200a of modiolus 200 will be called the radius of curvature " r " of the helical tooth ridge of modiolus 200.
Figure 15 and 16 is a chart, has shown the loss of transmitting torque relevant with tooth matching angle " θ " under gear of the present invention and situation at traditional gear respectively.In each chart, two types data have been shown, a kind of data that provide when very big for the radius of curvature of worm-gear tooth " R ", the another kind of data that provide when very little for radius of curvature " R ".
As from the chart of Figure 15 and 16 as can be seen, in gear of the present invention, the very little scope of transmitting torque loss is greater than traditional gear.That is to say that under situation of the present invention, even meshing error is a bit big, transmission loss also only demonstrates very little loss.The reasons are as follows.That is to say that As mentioned above, the helical tooth ridge 200a (referring to Fig. 5) of modiolus 200 has the circular recess outer surface in each side, therefore, the width " Sa " of the tooth top 211 of helical tooth ridge 200a is very little.Therefore, as shown in figure 12, when with the engagement of the tooth of worm gear 100, the tooth top of helical tooth ridge 200a is 211 smooth-going, in depth contact with the circular protrusions outer surface 101 of each tooth of worm gear 100.
Figure 17 be shown with worm-gear tooth radius of curvature " R " and modiolus helical tooth ridge radius of curvature " r " between relevant gear of the present invention of radius ratio and the maximum of the traditional gear chart of allowing tooth matching angle " θ max ".
Shown in chart, the maximum of gear of the present invention allows that tooth matching angle " θ max " is higher than traditional gear.
Figure 18 and 19 is a chart, has shown the loss of transmitting torque relevant with engaging position " y " under gear of the present invention and situation at traditional gear respectively.In each chart, two types data have been shown, a kind of data that provide when very big for the radius of curvature of worm-gear tooth " R ", the another kind of data that provide when very little for radius of curvature " R ".
Shown in the chart in Figure 18 and 19, with regard to engaging position (y), gear of the present invention is compared with traditional gear and is not being shown advantage aspect the transmitting torque loss.That is to say that shown in chart, when the radius of curvature " R " of worm-gear tooth was very big, the very little scope of torque transmitted loss was very big under the situation of gear of the present invention.Yet when the radius of curvature " R " of worm-gear tooth was very little, the very little scope of torque transmitted loss was very little under the situation of gear of the present invention.
Figure 20 be shown with worm-gear tooth radius of curvature " R " and modiolus helical tooth ridge radius of curvature " r " between the relevant gear of the present invention of radius ratio and the chart of the permissible error of the maximum engagement position " ymax " of traditional gear.
Shown in this chart, under the situation of the permissible error of maximum engagement position " ymax ", the characteristic line separately of gear of the present invention and traditional gear is being located to intersect by the point " α " of the value representation of radius ratio R/r (α).Shown in this chart, consider the higher permissible error of maximum engagement position " ymax ", should get the radius ratio R/r of the value that is equal to or greater than R/r (α) according to gear of the present invention.In an example of the present invention, radius ratio (R/r) is 5/3.Shown in chart, if radius ratio is 5/3, gear acquisition of the present invention is higher than the permissible error of the maximum engagement position (ymax) of traditional gear.Preferably, radius ratio (R/r) is in 5/3 to 2 scope.
If desired, following improvement can be applied to modiolus 200.That is to say that modiolus 200 can be formed with two around its helical tooth ridge that extends in parallel.
The full content that is filed in the Japanese patent application 2005-374089 on December 27th, 2006 is hereby incorporated by.
Although above invention has been described with respect to embodiments of the invention, the present invention is not limited to aforesaid embodiment.According to above description, those skilled in the art can carry out various improvement and distortion to this embodiment.
Claims (20)
1. gear comprises:
Worm gear (100), this worm gear has the tooth around its spaced at equal intervals, and each tooth of this worm gear has the circular protrusions outer surface in each side, and each groove (102) that is defined by two adjacent teeth of worm gear has curved bottom, and this bottom has first curvature radius (R); With
Modiolus (200), this modiolus has helical tooth ridge (200a), described helical tooth ridge (200a) has the circular recess outer surface in each side, the tooth of this helical tooth ridge and worm gear (100) engagement and have radius of second curvature (r) less than first curvature radius (R)
Wherein, engagement between each tooth of worm gear (100) and the helical tooth ridge of modiolus is represented by first characteristic line of describing in the performance plot, described performance plot has shown that modiolus (200) is vertically with respect to the relation between the radius ratio (R/r) between the permissible error of the maximum engagement position of worm gear (100) and first curvature radius (R) and the radius of second curvature (r)
Wherein, represent by second characteristic line in the described performance plot with reference to each tooth of worm gear and with reference to the engagement between the helical tooth ridge of modiolus, each tooth with reference to worm gear has flat outer surface in each side, has flat outer surface with reference to the helical tooth ridge of modiolus in each side;
Wherein, first characteristic line in the performance plot and second characteristic line intersect at the set point place; And
Wherein, engagement between the helical tooth ridge of each tooth of worm gear (100) and modiolus (200) conforms to the part of first characteristic line, this part is drawn when radius ratio is equal to or greater than a predetermined value, and described predetermined value is represented or corresponding to the crossing set point of first and second characteristic lines.
2. gear as claimed in claim 1 is characterized in that, the predetermined value of radius ratio (R/r) is about 5/3.
3. gear as claimed in claim 2 is characterized in that, the predetermined value of radius ratio (R/r) is in 5/3 to 2 scope.
4. gear as claimed in claim 1 is characterized in that, the tooth of the spaced at equal intervals of worm gear (100) is integrally formed on the annular plastics lid (120).
5. gear as claimed in claim 4 is characterized in that, described annular plastics lid (120) does not have and is included in its inner reinforcing fibre.
6. gear as claimed in claim 4 is characterized in that, described annular plastics lid (120) installs to endless metal core (110) with one heart and closely and goes up to form worm gear (100).
7. gear as claimed in claim 6 is characterized in that, described endless metal core (110) is formed with the tooth (111) of spaced at equal intervals around it, and each tooth (111) stretches into corresponding one middle part in annular plastics lid (120) tooth.
8. gear as claimed in claim 1, it is characterized in that, described worm gear (100) is connected in the steering equipment of motor vehicle, and modiolus (200) is connected on the motor, makes the driving torque of motor pass to steering equipment by intermeshing modiolus (200) and worm gear (100).
9. the method for the worm gear that is meshed with modiolus of a manufacturing, described modiolus has helical tooth ridge (200a), and described helical tooth ridge has the circular recess outer surface in each side, and described method comprises:
Prepare plectane embryo spare; With
The cylindrical peripheral part of cutting plectane embryo spare is to make the tooth (100a) of spaced at equal intervals around it, each described tooth (100a) has circular protrusions outer surface (101) in each side, when forming correct the cooperation between modiolus (200) and the worm gear (100), described circular protrusions outer surface (101) is configured as with the circular recess intimate of the helical tooth ridge (200a) of modiolus and engages
Wherein, the radius of curvature (R) of the curved bottom of each groove (102) that is defined by two adjacent teeth of worm gear (100) is greater than the radius of curvature (r) of the helical tooth ridge (200a) of modiolus (200).
10. method as claimed in claim 9 is characterized in that:
Engagement between each tooth of worm gear (100) and the helical tooth ridge of modiolus is represented by first characteristic line of describing in the performance plot, described performance plot has shown that modiolus (200) is vertically with respect to the relation between the radius ratio (R/r) between the permissible error of the maximum engagement position of worm gear (100) and first curvature radius (R) and the radius of second curvature (r)
Represent to have flat outer surface in each side with reference to each tooth of worm gear and with reference to the engagement between the helical tooth ridge of modiolus by second characteristic line in the described performance plot, have flat outer surface in each side with reference to the helical tooth ridge of modiolus with reference to each tooth of worm gear;
First characteristic line in the performance plot and second characteristic line intersect at the set point place; And
Engagement between the helical tooth ridge of each tooth of worm gear (100) and modiolus (200) conforms to the part of first characteristic line, this part is drawn when radius ratio is equal to or greater than a predetermined value, and described predetermined value is represented or corresponding to the crossing set point of first and second characteristic lines.
11. method as claimed in claim 10 is characterized in that, the predetermined value of radius ratio (R/r) is for being about 5/3.
12. method as claimed in claim 11 is characterized in that, the predetermined value of radius ratio (R/r) is in 5/3 to 2 scope.
13. method as claimed in claim 9, it is characterized in that, described worm gear comprises endless metal core (110) and with one heart and tightly fit to annular plastics lid (120) on the outer peripheral portion of described endless metal core, described annular plastics lid has tooth with helical tooth ridge (200a) engagement of modiolus (200) around it, and described endless metal core (110) is made by cutting method.
14. method as claimed in claim 9, it is characterized in that, described worm gear comprises endless metal core (110) and with one heart and tightly fit to annular plastics lid (120) on the outer peripheral portion of described endless metal core, described annular plastics lid has tooth with helical tooth ridge (200a) engagement of modiolus (200) around it, and described endless metal core (110) is made by sintering process.
15. a manufacturing has the method for the modiolus of helical tooth ridge (200a), described helical tooth ridge has the circular protrusions outer surface in each side, and described method comprises:
Prepare the cylindrical embryo spare of modiolus;
The outer surface of cutting circle cylindricality embryo spare forms helical tooth ridge (200a) to center on it, thereby makes the semi-finished product modiolus; With
The semi-finished product modiolus is carried out surface finish processing, and it is not heat-treated.
16. method as claimed in claim 15 is characterized in that, described surface finish processing is finished by texturing processing.
17. method as claimed in claim 16 is characterized in that, described texturing processing is so carried out, and makes the dimensional changes of face width of helical tooth ridge (200a) along with described part reduces near the tooth top of helical tooth ridge.
18. method as claimed in claim 16 is characterized in that, described texturing processing is so carried out, and makes the texturing processing rate along with described part reduces near the tooth top of helical tooth ridge.
19. method as claimed in claim 16 is characterized in that, compares with the helical tooth ridge of the modiolus that has carried out surface finish processing, the tolerance variation of the face width of helical tooth ridge is along with described part reduces near the tooth top of helical tooth ridge.
20. method as claimed in claim 16 is characterized in that, described modiolus is formed with two around its helical tooth ridge that extends in parallel, and wherein said two helical tooth ridges use two rolling forging dies to make.
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| CNA2007101095988A CN101334090A (en) | 2007-06-27 | 2007-06-27 | Worm-gear device and its making method |
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| CNA2007101095988A CN101334090A (en) | 2007-06-27 | 2007-06-27 | Worm-gear device and its making method |
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| CN101334090A true CN101334090A (en) | 2008-12-31 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20170071648A (en) * | 2015-12-15 | 2017-06-26 | 주식회사 만도 | Reducer of Power Steering Apparatus for Vehicle |
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2007
- 2007-06-27 CN CNA2007101095988A patent/CN101334090A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20170071648A (en) * | 2015-12-15 | 2017-06-26 | 주식회사 만도 | Reducer of Power Steering Apparatus for Vehicle |
| CN107031710A (en) * | 2015-12-15 | 2017-08-11 | 株式会社万都 | The decelerator of electric power-assisted steering apparatus |
| US10421479B2 (en) | 2015-12-15 | 2019-09-24 | Mando Corporation | Reducer of electric power steering apparatus |
| CN107031710B (en) * | 2015-12-15 | 2019-12-06 | 株式会社万都 | Speed reducer of electric power steering apparatus |
| KR102395672B1 (en) | 2015-12-15 | 2022-05-11 | 주식회사 만도 | Reducer of Power Steering Apparatus for Vehicle |
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