CN202431421U - Vehicle starter and spline device thereof - Google Patents

Vehicle starter and spline device thereof Download PDF

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Publication number
CN202431421U
CN202431421U CN 201220037636 CN201220037636U CN202431421U CN 202431421 U CN202431421 U CN 202431421U CN 201220037636 CN201220037636 CN 201220037636 CN 201220037636 U CN201220037636 U CN 201220037636U CN 202431421 U CN202431421 U CN 202431421U
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CN
China
Prior art keywords
splined section
spline
tooth
key tooth
pressure flank
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CN 201220037636
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Chinese (zh)
Inventor
邓方敏
M·施塔尔
A·尤拉施卡
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Thornger Automotive Parts Germany GmbH
Bosch Automotive Products Changsha Co Ltd
Robert Bosch GmbH
Original Assignee
Thornger Automotive Parts Germany GmbH
Robert Bosch GmbH
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Priority to CN 201220037636 priority Critical patent/CN202431421U/en
Application granted granted Critical
Publication of CN202431421U publication Critical patent/CN202431421U/en
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Abstract

The utility model relates to a spline device used in a vehicle starter. The spline device comprises a first spline portion and a second spline portion matched with the first spline portion. The first spline portion is provided with a group of spline teeth, and adjacent spline teeth form spline grooves. The second spline portion is provided with a group of spline teeth, and adjacent spline teeth form spline grooves. The spline teeth of the second spline portion are arranged in corresponding spline grooves of the first spline portion in a matched mode, and the spline teeth of the first spline portion are arranged in corresponding spline grooves of the second spline portion in a matched mode so as to enable the first spline portion and the second spline portion to perform relative axial slide mutually. The addendums of the group of spline teeth of the first spline portion are ground wholly so as to enable the radius of addendum circles limited by the addendums of the first spline portion to be 0.02-0.15mm smaller than the radius of dedendum circles limited by the bottoms of the spline grooves of the second spline portion. The utility model further relates to the vehicle starter comprising the spline device. The spline device is simple in structure and high in force moment transmission capacity.

Description

Vehicle starter and spline device thereof
Technical field
The utility model relates to a kind of spline device of vehicle starter and vehicle starter that comprises this spline device of being used for.
Background technique
The common electrification starter motor of modern vehicle starts the motor of vehicle, and starter motor changes the electric energy that vehicle battery stores into mechanical energy, drives the engine running of vehicle, with engine start.
Starter motor is made up of direct current motor, driving mechanism and control gear etc. substantially.When the motor of starting vehicle, motor produces running torque under the effect of DC of storage battery.This running torque is delivered to the gear ring on the engine flywheel through driving mechanism, drives the crankshaft rotating of motor.Driving mechanism comprises the reducing gear that links to each other with the output shaft of motor, the free wheel device that links to each other with reducing gear, passes through the output shaft that the spline device links to each other with free wheel device in the inner, is installed in the small gear that is used to drive gear ring of output shaft outer end.Said spline device comprises internal spline that is formed in the free wheel device and the external splines on output shaft the inner that is formed on that is mated, and external splines can endwisely slip with respect to internal spline.Control gear is used to control the running of motor and moving axially of output shaft, so that small gear and gear ring engagement and disengaging.
Because output shaft is exported running torque through small gear to gear ring in the outer end, so the outer end of output shaft can receive the reaction force from gear ring.This reaction force causes external splines on the inner of output shaft eccentric and produce coaxiality error with respect to the internal spline in the free wheel device.Said coaxiality error is very harmful for the transmission performance of starter motor etc., therefore need reduce this coaxiality error as far as possible.
In order to reduce the coaxiality error of spline device, a kind of scheme is disclosed among the GB2165620A, wherein, be provided with the elastic protrusion of axially being separated by in the key tooth of free-sliding spline element.According to this scheme, need to adopt supplementary structure to improve the coaxality of spline device, so the manufacture cost of spline device can increase.
In addition; According to disclosed technology among the CN1530537A; Schematically show among Fig. 1 like the application's Figure of description; Recessed spline fitted in the protruding spline on the inner of the output shaft 10 of starter motor and the interior section 11 of overrunning clutch, and interior section 11 is formed with stopper 12, and output shaft 10 passes the through hole in the stopper 12.Like this, can come the coaxality between protruding spline of complementary raising and the recessed spline through this axis hole cooperating structure.According to this scheme, also need adopt supplementary structure to improve the coaxality of spline device, so the manufacture cost of spline device can increase.
Therefore, hope can solve that the available technology adopting supplementary structure improves the coaxality of spline device and the problems such as cost increase that produce.
The model utility content
The purpose of the utility model is that the spline device that is used for vehicle starter is made improvement, wherein, needn't just can improve the coaxality of spline device by means of supplementary structure.
According to an aspect of the utility model, a kind of spline device that is used for vehicle starter is provided, it comprises: first splined section, it has one group of key tooth, forms keyway between the adjacent key tooth; And second splined section that cooperates with first splined section, it has one group of key tooth, forms keyway between the adjacent key tooth; Wherein, the key tooth of second splined section is engaged in the corresponding keyway of first splined section, and the key tooth of first splined section is engaged in the corresponding keyway of second splined section, so that first splined section and second splined section can endwisely slip against each other; The tooth top of said one group of key tooth of said first splined section is by overall grinding, so that the little 0.02~0.15mm of tooth root radius of a circle that the bottom in each keyway of said second splined section of radius ratio of the top circle that these tooth tops of said first splined section limit limits.
Preferably, the little 0.04~0.08mm of tooth root radius of a circle of said second splined section of the radius ratio of the top circle of said first splined section.
According to a preferred implementation of the utility model, said first splined section comprises external splines, the key tooth that its key tooth is an evagination; Said second splined section comprises internal spline, the key tooth that its key tooth is a convex.
According to a preferred implementation of the utility model, the key tooth of said first splined section and second splined section is the screw key tooth.
A preferred implementation according to the utility model; Under the operating condition of said spline device; The central axis of said first splined section is with respect to the central axis radial deflection of second splined section; So that the tooth top of a key tooth of first splined section contacts with the pressure flank with the corresponding teeth groove bottom of second splined section with the pressure flank, separate one section backlash between the corresponding non-pressure flank of the non-pressure flank of this key tooth and second splined section.
A preferred implementation according to the utility model; The pressure flank tooth top edge of the key tooth of said first splined section has the wedge angle that produces because of said grinding, and the pressure flank bottom margin of the corresponding teeth groove of said second splined section is provided with to be avoided dodging structure with said wedge angle clashes.
According to a preferred implementation of the utility model, the pressure flank tooth top edge of the key tooth of said first splined section is formed with chamfering.
According to a preferred implementation of the utility model, the pressure flank tooth top edge of the key tooth of said first splined section is formed with fillet.
According to a preferred implementation of the utility model, the angle of inclination of the pressure flank of the key tooth of said second splined section is less than the angle of inclination of the pressure flank of the key tooth of said first splined section.
Another aspect according to the utility model provides a kind of vehicle starter, and it comprises: motor; The reducing gear that links to each other with the output shaft of motor; The free wheel device that links to each other with reducing gear; Aforesaid spline device, second splined section of said spline device links to each other with the secondary part of free wheel device; The output shaft that links to each other with first splined section of said spline device; And be installed in being used on the output shaft and export the small gear that rotatablely moves.
According to the utility model, the tooth top of one of interior external splines of the spline device in the starter motor is by grinding, with the tip clearance of external splines in reducing.Like this, can significantly improve the coaxality of interior external splines.In addition, the coaxality of external splines in the utility model only just can improve through the spline device proper, and needn't be by means of any supplementary structure, this makes the spline device have simple structure and lower cost.In addition, the spline device can be kept high transmission of torque ability and structural reliability.
Description of drawings
Fig. 1 is a kind of according to the spline schematic representation of apparatus in the vehicle starter of existing technology.
Fig. 2 is the schematic representation according to the part of the vehicle starter of a preferred implementation of the utility model.
Fig. 3 is the enlarged diagram of the spline device in the starter motor shown in Figure 2.
Fig. 4 is the amplification profile that the A-A line in Fig. 3 is done.
Fig. 5 explains according to the inside and outside splined section fit system in the spline device of existing technology and the schematic representation of coaxiality error.
Fig. 6 explains the schematic representation that concerns between tip clearance and the backlash of the inside and outside splined section in the spline device.
Fig. 7 explains according to the inside and outside splined section fit system in the spline device of the utility model and the schematic representation of coaxiality error.
Fig. 8 shows according to the tooth top of the inside and outside splined section in the spline device of existing technology, the schematic representation of Fillet.
Fig. 9 is the schematic representation according to the inside and outside splined section in the spline device of a preferred implementation of the utility model, and wherein, internal spline partly has the grinding tooth top.
Figure 10-the 12nd is the schematic representation of the certain exemplary measure avoiding the grinding tooth top and the gullet base fillet of cooperation to conflict mutually taking.
Embodiment
Some preferred implementations of the utility model are described with reference to the accompanying drawings.
Part according to the vehicle starter of the preferred implementation of the utility model has been shown among Fig. 2.This starter motor mainly comprises compositions such as direct current motor 1, driving mechanism and control gear.
Motor 1 is installed in the housing (not shown) of starter motor.When the motor of starting vehicle, control gear is to the direct current of motor 1 supply from storage battery, so that motor 1 turns round and produces running torque.This running torque is delivered to the gear ring 2 on the engine flywheel through driving mechanism, drives the crankshaft rotating of motor.
Driving mechanism mainly comprises the reducing gear 3 that links to each other with the output shaft of motor 1, the free wheel device 4 that links to each other with reducing gear 3, passes through the output shaft 10 that spline device 5 links to each other with free wheel device 4 at inner (near that end of motor 1), is installed in the small gear that is used to drive gear ring 2 that output shaft 10 outer ends (away from that end of motor 1) are located.
Reducing gear 3 can be any type of reducing gear, for example reduction gears mechanism.Shown a kind of planetary gear reducing mechanism among Fig. 2; It comprises central gear 3-1 on the output shaft that is installed in motor 1, the external toothing 3-2 that installs with one heart around central gear 3-1 regularly, is engaged at least one the planetary pinion 3-3 between central gear and the external toothing, and the central shaft of planetary pinion 3-3 is installed on the planet carrier 3-4.When the output shaft of motor 1 drove central gear 3-1 rotation, what planet carrier 3-4 output speed had reduced rotatablely moved.
Like Fig. 2, shown in 3, free wheel device 4 comprises inside part 4-1, external lateral portion 4-2 and between inside part and external lateral portion, transmits the transmission of movement element of unidirectional rotary motion.At Fig. 2, shown in 3 in the example, the transmission of movement element is roller 4-3, but is appreciated that the transmission of movement element also can adopt other form well known in the art, for example voussoir, ratchet or the like.
In addition, at Fig. 2, shown in 3 in the example, inside part 4-1 constitutes the active part of free wheel device 4, and external lateral portion 4-2 constitutes the secondary part of free wheel device 4.Yet, is appreciated that also and can constitutes active part, and inside part 4-1 constitutes secondary part by external lateral portion 4-2.The planet carrier 3-4 of reducing gear 3 is installed in said active part (the inside part 4-1 among Fig. 2,3) and goes up or be integrally formed with it.
The secondary part of free wheel device 4 transmits rotatablely moving from reducing gear 3 through spline device 5 to output shaft 10.Like Fig. 2, shown in 3, spline device 5 comprises internal spline part 20 and the external splines part 30 that is mated.Internal spline part 20 forms or is installed on the secondary part (the external lateral portion 4-2 among Fig. 2,3) of free wheel device.External splines part 30 forms or is installed in the place, the inner of output shaft 10.
Inside and outside splined section key tooth separately is engaged in the other side's the teeth groove, and is as shown in Figure 4.
The flank profil of the key tooth of inside and outside splined section can adopt any form well known in the art, for example trapezoidal flank profil, involute profile etc.In addition, the key tooth can be with respect to the central axis of inside and outside splined section straight or spiral extension.Consider service behaviour, the key tooth of spiral extension shown in Figure 2 is preferred.
External splines part 30 can endwisely slip with respect to internal spline part 20 (under the situation that is provided with the screw key tooth, external splines part 30 is rotated with respect to internal spline part 20 simultaneously), to realize moving axially of output shaft 10.This axial motion is to realize through the driving lever 14 of control gear.The middle part of driving lever 14 is pivotably mounted on the fixing pivot 14-1, but the actuation element (not shown) in the rear end 14-2 controlled device of driving lever 14 roughly along the axial push-and-pull of output shaft 10, the front end 14-3 of driving lever 14 rests on the output shaft 10 pivotly.Through the rear end of push-and-pull driving lever 14 vertically of the actuation element in the control gear, so that driving lever pivots around pivot 14-1, the front end of driving lever drives output shaft 10 and moves axially (external splines part 30 endwisely slips with respect to internal spline part 20).Output shaft 10 (external splines part 30) has been shown among Fig. 2 has been in axial outermost locations.In order to keep this position of output shaft 10 (external splines part 30); Be provided with backstop 16 in the inner of output shaft 10; It can be resisted against the inner (or being resisted against on certain position of external lateral portion 4-2) of internal spline part 20, and (left side among Fig. 2) endwisely slips further towards the distally with respect to internal spline part 20 to stop external splines part 30.In this position, internal spline part 20 can drive external splines part 30 and rotate together.
Output shaft 10 is supported in the housing of starter motor through bearing 18 in approximate mid-section.Certainly, also can spring bearing be set at other position of output shaft.
In addition, small gear 6 is equipped with in the outer end of output shaft 10.Through moving axially of output shaft 10, gear ring 2 engagements and disengaging on this small gear 6 and the engine flywheel.Under the state that small gear 6 shown in Figure 2 and gear ring 2 mesh; The output of motor 1 rotatablely moves and running torque is delivered to gear ring 2 through reducing gear 3, free wheel device 4, spline device 5, output shaft 10, small gear 6 successively; So that drive the engine flywheel rotation, thereby ato unit.Behind engine start, control gear moves output shaft 10 through driving lever 14 towards nearside (right side among Fig. 2), so that small gear 6 breaks away from gear ring 2.
Transmit under the state of running torque with gear ring 2 engagements and to it at small gear 6; Small gear 6 can receive the reaction force from gear ring 2; This reaction force is passed to the outer end of output shaft 10, thereby causes external splines part 30 on the inner of output shaft 10 eccentric and produce coaxiality error with respect to internal spline part 20.As previously mentioned, the utility model is intended to reduce as far as possible this coaxiality error.
Below with reference to the coaxiality error in the spline device of Fig. 5,6 explanation existing technologies and the utility model.
It may be noted that in each accompanying drawing of the application various CONSTRUCTED SPECIFICATIONs are not to draw in proportion, in order clearly to show, certain structures details (especially key backlash) is exaggerated.And the distance among Fig. 5,6 between a pair of radially phase antibonding tooth has been dwindled, so that clearly explain.
External splines part 30 has the one group of evagination key tooth that distributes along excircle, forms keyway between the adjacent key tooth.Internal spline part 20 has the one group of inner earn key tooth that distributes along inner circumference, forms keyway between the adjacent key tooth.The key tooth of external splines part 30 is engaged in the corresponding keyway of internal spline part 20, and the key tooth of internal spline part 20 is engaged in the corresponding keyway of external splines part 30, and is as shown in Figure 4.
Referring to Fig. 5, according to the existing technology of routine, a pair of radially relative key tooth 32 of external splines part 30 is engaged in a pair of radially relative keyway 22 of internal spline part 20.
Pressure flank 34 and non-pressure flank 34 ' that each key tooth 32 of external splines part 30 has tooth top 36 and is positioned at tooth top 36 both sides.
The relative flank of each keyway 22 of internal spline part 20 pair of keys tooth of 26 both sides bottom 26 and bottom being positioned at (being pressure flank 24 and non-pressure flank 24 ') limits.The pressure flank 34 of the pressure flank 24 pushing external splines parts 30 through internal spline part 20, internal spline part 20 drives 30 rotations of external splines parts.
As well known in the art, the slip to axial between the interior external splines realizing being fitted to each other must provide tip clearance and backlash.According to prior standard, in vehicle starter, the conventional tip clearance of interior external splines is usually greater than 0.4mm, and conventional backlash is usually greater than 0.2mm.
Because output shaft is stressed, external splines part 30 produces eccentric with respect to internal spline part 20, i.e. coaxiality error, thus above-mentioned tip clearance and backlash can change.
For example; Suppose that external splines part 30 is with respect to 20 skews of internal spline part; As shown in Figure 5; External splines part 30 has a key tooth (the key tooth of top among Fig. 5) two flanks (pressure flank 34 and non-pressure flank 34 ') of 32 and contacts respectively with two relative flanks (pressure flank 24 and non-pressure flank 24 ') of the corresponding teeth groove 22 that limits internal spline part 20, and certainly, the contact pressure between the pressure flank 34 and 24 is much larger than the contact pressure between non-pressure flank 34 ' and 24 '.At this moment, the backlash of upside disappears, and upside tip clearance L1 reduces with respect to conventional tip clearance.
On the other hand; The key tooth of the opposition side of external splines part 30 (the key tooth of below among Fig. 5) 32 has only pressure flank 34 to contact with the relevant pressure flank 24 of internal spline part 20, and the backlash L2 ' between the corresponding non-pressure flank 24 ' of the non-pressure flank 34 ' of this key tooth 32 and internal spline part 20 increases with respect to conventional backlash.Under this state, downside tooth top gap L 1 ' increases with respect to conventional tip clearance.Because the increase of downside tip clearance, the area of contact of side pressure flank reduces under causing, and this can cause the transmission of torque ability drop of spline device, and causes the key tooth impaired easily.
For at this as far as other the phase antibonding tooth radially in pairs between the radially opposite key tooth, have a side tip clearance equally with backlash reduces, the situation of opposite side tip clearance and backlash increase.
Because the variation of above-mentioned tip clearance and backlash, the central axis 30A of external splines part 30 squints and generation offset (coaxiality error) with respect to the central axis 20A of internal spline part 20, and is as shown in Figure 5.
This offset (coaxiality error) depends primarily on the variable quantity of tip clearance and backlash.In conventional art, this offset (coaxiality error) be generally 0.2mm or more than.
The variable quantity that it may be noted that backlash is relevant with the variable quantity of tip clearance, and this point can be found out by the schematic representation from Fig. 6.
As shown in Figure 6, suppose in the cross section of a key tooth its flank with respect to the angle θ that tilts of the direction with its center line parallel, the variable quantity of the backlash L2 variable quantity that equals tip clearance L1 substantially multiply by sin θ so.
The utility model reduces conventional tip clearance through the grinding top circle, to help to suppress the variable quantity of tip clearance and backlash.
It may be noted that; In next doing description with reference to accompanying drawing; It is the tip clearance between the keyway of mode with the tooth top of the grinding external splines part 30 key tooth and the internal spline part 20 that reduce external splines part 30; Yet, be appreciated that mode that the utility model is equally applicable to the tooth top of grinding internal spline part 20 reduces the tip clearance between the keyway of key tooth and external splines part 30 of internal spline part 20.For fear of repetition, the latter's detailed description is omitted.
As shown in Figure 7; After splined section 30 creates through conventional processing technology (for example forging, digital control processing, electric discharge machining etc.) on the whole outside; Externally the tooth top of splined section 30 carries out grinding, so that the difference (conventional tip clearance) between the tooth root radius of a circle that the keyway of tooth top radius of a circle that the tooth top of external splines part 30 limits and internal spline part 20 bottom limits reduces with respect to conventional art.Because grinding can obtain high dimensional accuracy, the dimensional accuracy of the Outside radius of external splines part 30 is improved, thereby can accurately control conventional tip clearance.For example, according to a preferred implementation of the utility model, the radius size precision of grinding process itself maybe be in ± 0.005~0.01mm.On the other hand, for internal spline part 20, utilize broaching tool to process usually through pulling eye technology.For pulling eye technology, the radius size precision that it obtained maybe be at ± 0.010~0.015mm.Utilize such pulling eye technology to make internal spline part 20, and utilize above-mentioned grinding process processing external splines part 30, might conventional tip clearance be controlled at 0.02~0.15mm, preferably be controlled at 0.04~0.08mm.
According to the utility model; Because conventional tip clearance might be reduced to tens of/one with respect to existing technology; Therefore, in the starter motor operation process, the variable quantity of tip clearance and backlash all can reduce with similar magnitude; This makes the offset (coaxiality error) of inside and outside splined section might be controlled at utmost point low level; For example at 0.04mm or littler, this is significantly less than common 0.2mm in the conventional art or above offset (coaxiality error), thereby can greatly improve the performance of starter motor.
Further say; Referring to Fig. 7; Because reducing of conventional tip clearance, this makes when splined section 30 is with respect to 20 skews of internal spline part outside, after minimum radial deflection amount takes place; A key tooth (the key tooth of top among Fig. 7) 32 the tooth top 36 that just has external splines part 30 touches the bottom of the corresponding teeth groove of internal spline part 20; In this state, the pressure flank 34 of this key tooth and top side 36 contact respectively with bottom 26 with the pressure flank 24 of the corresponding teeth groove 22 that limits internal spline part 20, and non-pressure flank 34 ', have backlash L2 between 24 '.The tip clearance that is this key tooth is reduced to zero, and on the other hand, its backlash L2 has only reduced very little degree with respect to conventional backlash.
On the other hand; 32 pressure flank 34 contacts with the relevant pressure flank 24 of internal spline part 20 the key tooth of the opposition side of external splines part 30 (the key tooth of below among Fig. 7), and the non-pressure flank 34 ' of this key tooth 32 is separated corresponding backlash L2 ' and tip clearance L1 ' with the top side 36 and the corresponding non-pressure flank 24 ' of internal spline part 20 with gullet base 26.Because the variation (reducing) of upside tip clearance amount is minimum, so the variation (increase) of downside tooth top gap L 1 ' and backlash L2 ' is also minimum.According to this configuration, the central axis 30A of external splines part 30 is minimum with respect to the offset (coaxiality error) of the central axis 20A of internal spline part 20.
In addition, because the increasing amount of downside tip clearance is minimum, therefore the decrease of the area of contact of side pressure flank is also minimum down, and this makes the spline device can keep very high transmission of torque ability drop, and the key tooth is difficult for impaired.
It may be noted that; The tooth top edge of the key tooth of the interior external splines of spline device is formed with fillet usually with the bottom margin of corresponding teeth groove; As shown in Figure 8, and the fillet radius R1 of the tooth top edge of key tooth is usually greater than the fillet radius R2 at the bottom margin place of corresponding teeth groove.According to the utility model and during the tooth top of grinding external splines part 30, the tooth top edge of the key tooth of splined section 30 goes out to produce wedge angle outside possibly, and is as shown in Figure 9.In this case, the tooth top edge wedge angle of the key tooth of external splines part 30 can clash with the bottom margin fillet of the teeth groove of internal spline part 20.For fear of this situation, need internal splined section 20 and/or external splines part 30 further to handle.With reference to Figure 10-12 the feasible treatment measures according to some mode of executions of the utility model are described below.
Shown in figure 10; A mode of execution according to the utility model; Can change the pressure flank gradient of the key tooth of internal spline part 20 or external splines part 30; So that the pressure flank gradient of the key tooth of internal spline part 20 is less than the pressure flank gradient of the key tooth of external splines part 30, thereby between the pressure flank of the key tooth of internal spline part 20 and external splines part 30, stagger a little angle [alpha].For example; In the cross section of spline device, see; The pressure flank of the key tooth of internal spline part 20 with respect to the tilt angle of 28 degree of the direction of key tooth radial center line parallel; And the pressure flank of the key tooth of external splines part 30 with respect to the tilt angle of 30 degree of the direction of key tooth radial center line parallel, the angle [alpha] of 2 degree that so produce can be so that the pressure flank tooth top edge wedge angle of the key tooth of external splines part 30 be dodged the pressure flank bottom margin fillet of the teeth groove of internal spline part 20.
Shown in figure 11, according to another mode of execution of the utility model, the pressure flank tooth top edge of the key tooth of splined section 30 processes a chamfering 40 outside, with the pressure flank bottom margin fillet of the teeth groove of dodging internal spline part 20.
Shown in figure 12, according to another mode of execution of the utility model, can process inscribe part 42, with the pressure flank tooth top edge wedge angle of the key tooth of dodging external splines part 30 at the pressure flank bottom margin fillet place of the teeth groove of internal spline part 20.
Another mode of execution (not shown) according to the utility model; Can make before grinding that the pressure flank tooth top edge of external splines key tooth partly has bigger fillet, and still have and be enough to dodge the pressure flank bottom margin fillet of the teeth groove of internal spline part through the part of this fillet after the grinding.
It will be understood by those skilled in the art that and to adopt any other suitable structure of dodging to avoid the front conflict.
Can see that according to the basic principle of the utility model, the tooth top of one of interior external splines of the spline device in the starter motor is by grinding, with the tip clearance of external splines in reducing.Simultaneously, in the starter motor operation process, the grinding tooth top of a spline is connected on the gullet base of corresponding spline.Like this, can significantly improve the coaxality of interior external splines.In addition, the utility model only just can improve the coaxality of interior external splines through the spline device proper, and needn't be in existing technology by means of any supplementary structure, this makes the spline device have simple structure and lower cost.Simultaneously, the spline device can be kept high transmission of torque ability and structural reliability.
This spline device of the utility model is applicable to the starter motor of various vehicles, the for example starter motor of diesel vehicle.
Though described the utility model, the details shown in the scope of the utility model is not limited to reference to concrete mode of execution here.Under the situation of the basic principle that does not depart from the utility model, can make various modifications to these details.

Claims (10)

1. spline device that is used for vehicle starter comprises:
First splined section, it has one group of key tooth, forms keyway between the adjacent key tooth; And
Second splined section that cooperates with first splined section, it has one group of key tooth, forms keyway between the adjacent key tooth;
Wherein, the key tooth of second splined section is engaged in the corresponding keyway of first splined section, and the key tooth of first splined section is engaged in the corresponding keyway of second splined section, so that first splined section and second splined section can endwisely slip against each other;
It is characterized in that; The tooth top of said one group of key tooth of said first splined section is by overall grinding, so that the little 0.02~0.15mm of tooth root radius of a circle that the bottom in each keyway of said second splined section of radius ratio of the top circle that these tooth tops of said first splined section limit limits.
2. spline device as claimed in claim 1 is characterized in that, the little 0.04~0.08mm of tooth root radius of a circle of said second splined section of the radius ratio of the top circle of said first splined section.
3. spline device as claimed in claim 1 is characterized in that, said first splined section comprises external splines, the key tooth that its key tooth is an evagination; Said second splined section comprises internal spline, the key tooth that its key tooth is a convex.
4. spline device as claimed in claim 1 is characterized in that, the key tooth of said first splined section and second splined section is the screw key tooth.
5. spline device as claimed in claim 1; It is characterized in that; Under the operating condition of said spline device; The central axis of said first splined section is with respect to the central axis radial deflection of second splined section, so that the tooth top of a key tooth of first splined section contacts with the pressure flank with the corresponding teeth groove bottom of second splined section with the pressure flank, separates one section backlash between the corresponding non-pressure flank of the non-pressure flank of this key tooth and second splined section.
6. like each described spline device in the claim 1 to 5; It is characterized in that; The pressure flank tooth top edge of the key tooth of said first splined section has the wedge angle that produces because of said grinding, and the pressure flank bottom margin of the corresponding teeth groove of said second splined section is provided with to be avoided dodging structure with said wedge angle clashes.
7. like each described spline device in the claim 1 to 5, it is characterized in that the pressure flank tooth top edge of the key tooth of said first splined section is formed with chamfering.
8. like each described spline device in the claim 1 to 5, it is characterized in that the pressure flank tooth top edge of the key tooth of said first splined section is formed with fillet.
9. like each described spline device in the claim 1 to 5, it is characterized in that the angle of inclination of the pressure flank of the key tooth of said second splined section is less than the angle of inclination of the pressure flank of the key tooth of said first splined section.
10. a vehicle starter is characterized in that, comprising:
Motor;
The reducing gear that links to each other with the output shaft of motor;
The free wheel device that links to each other with reducing gear;
Like each described spline device in the claim 1 to 9, second splined section of said spline device links to each other with the secondary part of free wheel device;
The output shaft that links to each other with first splined section of said spline device; And
Being installed in being used on the output shaft exports the small gear that rotatablely moves.
CN 201220037636 2012-02-06 2012-02-06 Vehicle starter and spline device thereof Withdrawn - After Issue CN202431421U (en)

Priority Applications (1)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103244570A (en) * 2012-02-06 2013-08-14 博世汽车部件(长沙)有限公司 Vehicle starter and spline device thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103244570A (en) * 2012-02-06 2013-08-14 博世汽车部件(长沙)有限公司 Vehicle starter and spline device thereof
WO2013117158A1 (en) * 2012-02-06 2013-08-15 Bosch Automotive Products (Changsha) Co. Ltd. Vehicle starter and spline assembly thereof

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