阅读说明：本技术 一种无鼻式起动机及其单向器支撑结构 (No nose formula starter and isolator bearing structure thereof ) 是由 李想 胡立斌 张炳琪 于 2020-04-30 设计创作，主要内容包括：一种无鼻式起动电机及其单向器支撑结构,该无鼻式起动电机的单向器支撑结构包括单向器前端支撑结构和单向器后端支撑结构,该单向器后端支撑结构包括止推件,设置在单向离合器的滑座后端的安装孔内,该止推件包括止推垫块和滚针轴承,该止推垫块包括同轴设置的第一外圆面、第二外圆面、第三外圆面和止推内孔,该滚针轴承安装在该止推内孔中,无鼻式起动电机电枢轴的轴端安装在该滚针轴承上,该第一外圆面和第二外圆面之间形成有第一轴肩,该第一外圆面与第三外圆面之间形成有第二轴肩,该安装孔对应于该止推垫块设置为阶梯孔,该第一轴肩与该阶梯孔的阶梯端面形成轴向定位,该第一外圆面和第二外圆面分别与该阶梯孔为间隙配合。(A kind of no nose type starter motor and its one-way device supporting structure, the one-way device supporting structure of the no nose type starter motor includes the front end supporting structure of the one-way device and the back end supporting structure of the one-way device, the back end supporting structure of the one-way device includes the thrust piece, set up in the mounting hole of the slide base back end of the one-way clutch, the thrust piece includes the thrust cushion block and the needle bearing, the thrust cushion block includes the first excircle surface, the second excircle surface, the third excircle surface and the thrust inner hole that set up coaxially, the needle bearing is installed in the thrust inner hole, the shaft end of the no nose type starter motor armature shaft is installed on the needle bearing, there is the first shaft shoulder between the first excircle surface and the second excircle surface, there is the second shaft shoulder between the first excircle surface and the third excircle surface, the mounting hole sets up as the shoulder corresponding to the thrust cushion block, the first shaft shoulder forms the axial location with the stepped end face of the stepped hole, the first outer circular surface and the second outer circular surface are in clearance fit with the stepped hole respectively.)

1. An isolator support structure for a nose-less starter motor for an extra-heavy one-way clutch having double rows of rollers, the isolator support structure comprising an isolator front end support structure and an isolator rear end support structure, the isolator rear end support structure comprising:

the thrust piece sets up in the mounting hole of one-way clutch's slide rear end, the thrust piece includes thrust cushion and needle bearing, the thrust cushion includes first outer disc, second outer disc, third outer disc and the thrust hole of coaxial setting, needle bearing installs in the thrust hole, and the axle head of no nose formula starter motor's armature shaft is installed on needle bearing, be formed with first shoulder between first outer disc and the second outer disc, be formed with the second shoulder between first outer disc and the third outer disc, the mounting hole correspond to the thrust cushion sets up to the shoulder, first shoulder with the ladder terminal surface of shoulder forms axial positioning, first outer disc and second outer disc respectively with the shoulder is clearance fit.

2. The isolator support structure for a nose-less starter motor according to claim 1, further comprising a quenching washer provided between the first end surface of the thrust block and the sun gear end surface of the armature shaft.

3. The isolator support structure for a nose-less starter motor according to claim 1 or 2, wherein the thrust pad is further provided with an oil reservoir on the first end surface thereof for storing grease to reduce wear caused by relative rotation between the first end surface and the hardened washer.

4. The isolator support structure of a nose-less starter motor according to claim 1 or 2, wherein a fitting clearance of the second outer circular surface with the stepped hole is smaller than a fitting clearance of the first outer circular surface with the stepped hole.

5. The isolator support structure of the nose-less starter motor according to claim 1 or 2, wherein the needle roller bearing is pressed into the thrust inner bore from a side of the second end face of the thrust pad, and an end face of the needle roller bearing is flush with the second end face.

6. The one-way clutch support structure for the nose-less starter motor according to claim 1 or 2, wherein the one-way clutch front end support structure is provided at an outer end of an inner race shaft of the one-way clutch, the outer end of the inner race shaft being mounted and supported on a middle cap of the nose-less starter motor through a middle cap needle bearing.

7. The isolator support structure of the nose-less starter motor according to claim 1 or 2, wherein a side of the armature shaft near the shaft end is supported and mounted on an inner hole of a cover plate of a gear chamber of the nose-less starter motor.

8. The isolator support structure of a nose-less starter motor according to claim 7, wherein a ball bearing is press-fitted to a root of a sun gear of the armature shaft, and the ball bearing is mounted on an inner hole of the cover plate of the gear chamber.

9. The isolator support structure of the nose-less starter motor according to claim 7, wherein a friction plate is further provided between the gear chamber cover plate and the planetary gear chamber of the nose-less starter motor, the friction plate is mounted on the inner spigot of the middle cover, and a positioning port for circumferential positioning and stopping is provided on a circumference of the friction plate.

10. A naseless starter motor characterized by comprising the isolator support structure according to any one of claims 1 to 9.

Technical Field

The invention relates to a nose-free speed reduction starting motor, in particular to a nose-free starter which is used for a heavy diesel engine and has a double supporting point and an isolator supporting structure thereof, wherein an isolator only rotates and does not drive out.

Background

The starter that present commercial car was used mainly divide into according to mechanical system's structural design and has two kinds with nose formula starter and no nose formula starter, and no nose formula starter is owing to its sealing performance height, environmental suitability is strong and physics matches advantages such as easier and is received global market and customer's favor.

The traditional nose-free starter is characterized in that the whole isolator is in a cantilever supporting state after the driving gear is driven out, and only the gear shaft and the inner bearing of the front cover have one supporting point, so that the nose-free starter is not provided in the aspect of supporting stability. And because the one-way clutch of the traditional starter is moved axially as a whole, and in addition, the parts such as the driving gear and the like are added, the mass of the whole moving pair is very large, and a large electromagnetic switch is needed to provide enough electromagnetic force to quickly drive the whole moving pair out.

With the continuous improvement of global energy-saving and environment-friendly requirements, a novel nose-free starter is urgently needed, the mass of a moving pair needs to be reduced as much as possible besides better supporting stability, namely double supporting points, so as to match with a smaller electromagnetic switch design, thereby reducing the mass of the nose-free starter on the whole, improving the power-to-quality ratio and efficiency of the starter, and meeting the increasingly severe requirements of energy conservation and emission reduction.

Fig. 1 is a partial cross-sectional view of a prior art isolator support structure. As shown in fig. 1, the core support system of the starter is composed of the following components: an isolator 100, a middle cover 110, an output shaft 120, a thrust pad 130, an armature 140, a gear chamber cover plate 150, a planetary gear 160, and the like. The front end of the output shaft 120 forms a support with the starter front cover inner bearing, the rear end forms a support with the inner ring 101 of the isolator 100 through spiral spline connection, and the front end of the isolator 100 forms a support with the needle bearing of the middle cover 110 through the inner ring 101. The output shaft 120 is firmly supported by the two support points after being driven out. The support is stable on the premise that the support of the isolator 100, which participates in the rear end support of the output shaft 120, must be stable as a whole. In this structure, the front end support of the isolator 100 is formed by the isolator inner ring 101 and the needle bearing of the middle cap 110, without problems; the rear support of the isolator 100 is formed by a shaft head of an armature shaft 140, a thrust pad 130, an isolator inner ring 101 and a bushing 103 which is pressed at the rear end of an isolator sliding seat 102, a bearing is not arranged between the armature shaft 140 and the thrust pad 130, the axial positioning of the thrust pad 130 is mainly formed by a thin annular shoulder and the end surface of the isolator inner ring 101, and the bearing is very unreliable and is easy to break and fail. The front support of the armature shaft 140 mainly forms a neck support by a bearing 141 pressed on the front end of the armature sun gear and a gear chamber cover plate 150 arranged on the inner spigot of the middle cover 110; the gear chamber cover plate 150 is a stamping part, has a complicated structure, and cannot be subjected to heat treatment, so that the strength and the hardness are low, and in the working process of the starter, particularly when the starter is reversely dragged by an engine, the four planetary gears 160 rotate at a high speed and axially shift at the same time, so that the gear chamber cover plate 150 is easily impacted, deformed and even broken, and the front end support of the armature shaft 140 fails, thereby the rear end support of the isolator 100 fails, further the support system of the whole starter fails, and the starter is forced to work.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a non-nose starter with high stability and reliability and an isolator supporting structure thereof.

In order to accomplish the above object, the present invention provides a one-way clutch support structure of a nose-less starter motor for an extra-heavy one-way clutch having double rows of rollers, the one-way clutch support structure including a one-way clutch front end support structure and a one-way clutch rear end support structure, wherein the one-way clutch rear end support structure includes:

the thrust piece sets up in the mounting hole of very heavy one-way clutch's slide rear end, the thrust piece includes thrust cushion and needle bearing, the thrust cushion includes first outer disc, second outer disc, the outer disc of third and the thrust hole of coaxial setting, needle bearing installs in the thrust hole, the axle head of no nose formula starter motor's armature shaft is installed on needle bearing, be formed with first shaft shoulder between first outer disc and the second outer disc, be formed with the second shaft shoulder between first outer disc and the third outer disc, the mounting hole correspond to the thrust cushion sets up to the shoulder hole, first shaft shoulder with the shoulder end face of shoulder hole forms axial positioning, first outer disc and second outer disc respectively with the shoulder hole is clearance fit.

The isolator supporting structure of the nose-free starting motor further comprises a quenching gasket arranged between the first end face of the thrust cushion block and the sun gear end face of the armature shaft.

In the above isolator supporting structure of the nose-less starting motor, the first end surface of the thrust pad block is further provided with an oil storage groove for storing lubricating grease so as to reduce wear caused by relative rotation between the first end surface and the quenching gasket.

In the above isolator supporting structure of the nose-less starter motor, a fitting clearance between the second outer circular surface and the stepped hole is smaller than a fitting clearance between the first outer circular surface and the stepped hole.

In the above isolator supporting structure of the nose-less starter motor, the needle roller bearing is pressed into the thrust inner hole from the second end face side of the thrust cushion block, and the end face of the needle roller bearing is flush with the second end face.

In the above isolator support structure of the nose-less starter motor, the front end support structure of the isolator is arranged at the outer end of the inner ring shaft of the one-way clutch, and the outer end of the inner ring shaft is mounted and supported on the middle cover of the nose-less starter motor through the needle roller bearing of the middle cover.

In the above isolator supporting structure of the nose-less starter motor, one side of the armature shaft near the shaft end is supported and mounted on the inner hole of the gear chamber cover plate of the nose-less starter motor.

In the above isolator supporting structure of the nose-less starter motor, the ball bearing is press-fitted at the root of the sun gear of the armature shaft, and the ball bearing is mounted on the inner hole of the gear chamber cover plate.

In the above isolator supporting structure of the nose-less starter motor, a friction plate is further arranged between the gear chamber cover plate and the planetary gear chamber of the nose-less starter motor, the friction plate is mounted on the inner spigot of the middle cover, and a positioning opening for circumferential positioning and stopping is arranged on the circumference of the friction plate.

In order to better achieve the above object, the present invention also provides a nose-less starter motor, which includes the above-described isolator support structure.

The invention has the technical effects that:

1. according to the invention, the needle roller bearing is arranged on the thrust cushion block, the armature and the isolator are connected through the thrust cushion block, the armature front end armature shaft supports the thrust cushion block, and the thrust cushion block provides reliable radial support for the rear end of the isolator through the armature shaft, so that the isolator only rotates and does not move, and the problem that the support structure of the isolator in the prior art is unstable and cannot provide stable and reliable support for the heavy double-row roller isolator with larger mass, so that early failure occurs can be thoroughly solved;

2. by assembling the quenched friction plate between the gear chamber cover plate and the planetary gear chamber, the problem that the gear chamber cover plate is damaged due to high-speed rotation and axial leaping of the planetary gear in the working process of the starter caused by low hardness of the punch-formed gear chamber cover plate is solved, and the stability and durability reliability of the whole supporting system are improved;

3. according to the invention, the quenched steel gasket is assembled between the thrust cushion block and the armature shaft sun gear, the thrust cushion block is made of powder metallurgy materials, and the oil storage groove is formed in the second end face of the thrust cushion block, so that the abrasion of the thrust cushion block, the isolator and the armature shaft is greatly reduced, and the service life of the whole machine is prolonged;

4. the support structure of the invention has simple structure, easy assembly and low cost, and is suitable for mass production.

The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.

Drawings

FIG. 1 is a partial cross-sectional view of a prior art isolator support structure;

fig. 2 is a schematic structural view (at rest) of a noseless starter according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view of a noseless starter in accordance with an embodiment of the present invention;

FIG. 4 is a cross-sectional view of a support structure for an isolator in accordance with an embodiment of the present invention;

FIG. 5 is a cross-sectional view of an output shaft support structure according to one embodiment of the present invention;

FIG. 6 is a cross-sectional view of a thrust member according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a friction plate according to an embodiment of the invention.

Wherein the reference numerals

Prior Art

100 one-way clutch

101 isolator inner ring

102 isolator slide

103 lining

110 middle cover

120 output shaft

130 thrust pad

140 armature

141 bearing

150 gear chamber cover plate

160 planetary gear

The invention

1 stator

2 front cover

3 one-way clutch

31 sliding seat

32 mounting hole

33 stepped end face

34 inner ring shaft

4 middle cover

41 middle cover needle roller bearing

42 seam allowance

5 output shaft

6 thrust piece

61 thrust pad

62 needle roller bearing

63 first outer circular surface

64 second outer circular surface

65 third outer circular surface

66 first end face

661 oil storage tank

67 second end face

68 first shoulder

69 second shoulder

60 thrust inner hole

7 armature

71 armature shaft

72 shaft end

73 sun gear

74 sun gear end face

75 ball bearing

8 quenching gasket

9 Gear chamber cover plate

91 inner hole

10 friction plate

101 positioning port

11 Shifting fork

12 front bearing

13 rear cover

14 electromagnetic switch

15 drive gear

16 planetary gear

Detailed Description

The invention will be described in detail with reference to the following drawings, which are provided for illustration purposes and the like:

referring to fig. 2 and 3, fig. 2 is a schematic structural view (at rest state) of a non-nose type starter according to an embodiment of the present invention, and fig. 3 is a sectional view of the non-nose type starter according to the embodiment of the present invention. The starter can be applied to heavy and extra-heavy commercial vehicles. The non-nose starter is characterized in that a supporting framework is formed by a front cover 2, a middle cover 4 and a rear cover 13 which are sequentially arranged, an output shaft 5 is installed and supported on the front cover 2 and the middle cover 4, a driving gear 15 is installed at the shaft end 72 of the output shaft 5, a stator 1 and an armature 7 are installed between the rear cover 13 and the middle cover 4, the output shaft 5 is connected with an electromagnetic switch 14 through a shifting fork 11, the electromagnetic switch 14 can be installed on the middle cover 4, the front end of the output shaft 5 supports a front bearing 12 which is pressed on the front cover 2, the rear end of the output shaft 5 supports the outer end of an inner ring shaft 34 which depends on a one-way clutch 3 and forms reliable radial support with a middle cover needle bearing 41 in the middle cover 4, and the one-way clutch 3 is preferably an extra-heavy one-way clutch with double rows of rollers. When the one-way clutch works, the electromagnetic switch 14 pulls out the output shaft 5 through the shifting fork 11, the output shaft 5 drives the driving gear 15 to be driven forwards together to be meshed with a flywheel gear ring of an engine, and the one-way clutch 3 only rotates in the circumferential direction and cannot move axially along with the driving of the output shaft 5; the output shaft 5 has two support points for a reliable support in both the rest and the driving position. The composition, structure, mutual position relation and connection relation of other parts of the non-nose type starter, working principle and the like are mature prior art, so that the detailed description is not repeated, and only the support structure of the isolator is explained in detail below.

Referring to fig. 4 and 5, fig. 4 is a sectional view of a support structure of a one-way clutch according to an embodiment of the present invention, and fig. 5 is a sectional view of a support structure of an output shaft according to an embodiment of the present invention. The invention relates to an isolator supporting structure of a nose-free starting motor, which is used for an extra-heavy one-way clutch with double rows of rollers, and comprises an isolator front end supporting structure and an isolator rear end supporting structure, wherein the isolator front end supporting structure is arranged at the outer end of an inner ring shaft 34 of a one-way clutch 3, the outer end of the inner ring shaft 34 is installed and supported on a middle cover 4 of the nose-free starting motor through a middle cover needle roller bearing 41, and the isolator rear end supporting structure comprises: and the thrust piece 6 is arranged in a mounting hole 32 at the rear end of the sliding seat 31 of the extra-heavy one-way clutch. Referring to fig. 6, fig. 6 is a cross-sectional view of a thrust member 6 according to an embodiment of the present invention. The thrust piece 6 comprises a thrust pad block 61 and a needle roller bearing 62, the thrust pad block 61 is preferably a powder metallurgy material piece, the thrust pad block 61 comprises a first outer circular surface 63, a second outer circular surface 64, a third outer circular surface 65 and a thrust inner hole 60 which are coaxially arranged, the needle roller bearing 62 is installed in the thrust inner hole 60, a shaft end 72 of an armature shaft 71 of the nose-less starter motor is installed on the needle roller bearing 62, one side of the armature shaft 71 close to the shaft end 72 is supported and installed on an inner hole 91 of a gear chamber cover plate 9 of the nose-less starter motor, specifically, a ball bearing 75 can be pressed at a sun wheel root 73 of the armature shaft 71, then the ball bearing 75 is installed on the inner hole 91 of the gear chamber cover plate 9, a first shaft shoulder 68 is formed between the first outer circular surface 63 and the second outer circular surface 64, a second shaft shoulder 69 is formed between the first outer circular surface 63 and the third outer circular surface 65, the mounting hole 32 is provided as a stepped hole corresponding to the thrust pad 61, the first shoulder 68 and the stepped end face 33 of the mounting hole 32 form axial positioning, and the first outer circular surface 63 and the second outer circular surface 64 are in clearance fit with the stepped hole respectively. The fit clearance of the second outer circular surface 64 with the stepped hole is smaller than the fit clearance of the first outer circular surface 63 with the stepped hole.

This embodiment may further comprise a hardened shim 8, preferably a hardened steel shim, disposed between the first end face 66 of the thrust block 61 and the sun gear end face 74 of the armature shaft 71, the hardened shim 8 being greased on both sides to reduce wear between the sun gear end face 74 of the armature 7 and the first end face 66 of the thrust block 61. The first end surface 66 of the thrust block 61 is also provided with an oil reservoir 661 for storing grease to reduce wear caused by relative rotation between the first end surface 66 and the hardened shim 8. The needle roller bearing 62 is pressed into the thrust inner hole 60 from the side of the second end face 67 of the thrust pad block 61, the end face of the needle roller bearing 62 is flush with the second end face 67, and a certain gap exists between the other end face of the needle roller bearing 62 and the first end face 66 of the thrust pad block 61. The first shoulder 68 of the thrust washer 61 is an axial positioning surface of the thrust washer 61 and engages the stepped end surface 33 of the mounting hole 32 of the slider 31 of the isolator 3.

Referring to fig. 7, fig. 7 is a schematic structural diagram of a friction plate 10 according to an embodiment of the present invention. A friction plate 10 can be further arranged between the gear chamber cover plate 9 and the planetary gear chamber of the nose-free starting motor, the friction plate 10 is installed on the inner spigot 42 of the middle cover 4, and a positioning hole 101 for circumferential positioning and stopping is arranged on the circumference of the friction plate 10. That is, in the present embodiment, the rear end support of the one-way clutch 3 having the double row rollers is performed by the stepped hole of the rear end of the slider 31, the thrust pad 61, and the shaft end 72 of the armature shaft 71; the front end of the one-way clutch 3 is radially supported by the outer end of the inner ring shaft 34 and a middle cover needle roller bearing 41 in the middle cover 4; the second outer circular surface 64 of the thrust cushion block 61 is in clearance fit with the stepped hole of the sliding seat 31 of the one-way clutch 3, the first shaft shoulder 68 of the thrust cushion block 61 and the stepped end surface 33 of the stepped hole of the sliding seat 31 of the one-way clutch 3 form axial positioning, the root of the sun gear 73 of the armature 7 is pressed with the ball bearing 75, and forms radial rotation support with the inner hole 91 of the gear chamber cover plate 9; the axial positioning of the armature 7 is formed by the sun wheel end face 74 and the first end face 66 of the thrust block 61; a quenching gasket 8 is arranged between the armature shaft 71 and the thrust cushion block 61; a friction plate 10 is arranged between the gear chamber cover plate 9 and the middle cover 4, and the friction plate 10 is installed on an inner spigot 42 of the middle cover 4. The friction plate 10 is preferably a quenching piece, is high in strength and hardness, is arranged between the gear chamber cover plate 9 and the planetary gear 16, can thoroughly eliminate damage to the gear chamber cover plate 9 due to high-speed rotation and axial movement of the planetary gear 16, and enables the gear chamber cover plate 9 to provide effective and stable support for the front end of the armature shaft 71, so that the front end of the armature shaft 71 passes through the thrust cushion block 61 and provides reliable and effective support for the rear end of the one-way clutch 3, and the support stability and strength of the whole machine are greatly improved.

The invention is suitable for the nose-free starter with a one-way clutch which only rotates and does not drive out and has double supporting points. The rear end support of the one-way clutch 3 which only rotates and does not move is completed by a stepped hole at the rear end of the sliding seat 31, the thrust piece 6 and a shaft end 72 of the armature shaft 71; the thrust cushion block 61 is internally provided with a needle bearing 62 in a pressing way and is arranged in a rear end mounting hole 32 of a sliding seat 31 of the one-way clutch; the rear end of the one-way clutch 3 is positively supported for radial rotation by a separate thrust piece 6 with the front shaft end 72 of the armature 7. The thrust pad 61 is preferably stepped, with the diameter of the second outer circular surface 64 being smaller than the diameter of the first outer circular surface 63; the second outer circular surface 64 of the thrust cushion block 61 is in small clearance fit with a stepped hole at the rear end of the sliding seat 31; the first outer circular surface 63 of the thrust cushion block 61 is in large clearance fit with a stepped hole at the rear end of the sliding seat 31; the first shoulder 68 of the thrust block 61 forms an axial location with the stepped end face 33 of the slide 31.

According to the invention, the needle roller bearing 62 is arranged on the thrust cushion block 61, the thrust cushion block 61 is connected with the armature shaft 71 and the one-way clutch 3, the shaft end 72 of the armature shaft 71 supports the thrust piece 6, and the thrust piece 6 provides reliable radial support for the rear end of the one-way clutch 3 through the armature shaft 71, so that the one-way clutch 3 only rotates and does not move, and the problems that the support structure of the one-way clutch in the prior art is unstable, and stable and reliable support cannot be provided for the heavy double-row roller one-way clutch with large mass, so that early failure occurs can be thoroughly solved; the quenched friction plate 10 is assembled between the gear chamber cover plate 9 and the planetary gear chamber, so that the problem that the gear chamber cover plate 9 is damaged due to high-speed rotation and axial leaping of the planetary gear 16 in the working process of the starter caused by low hardness of the punch-formed gear chamber cover plate 9 is solved, and the stability and durability reliability of the whole supporting system are improved; meanwhile, the quenching gasket 10 made of steel materials is assembled between the thrust block 61 and the sun gear 73, the thrust block 61 is preferably made of powder metallurgy materials, the first end face 66 of the thrust block 61 is provided with the oil storage groove 661, abrasion of the thrust block 61, the one-way clutch 3 and the armature shaft 71 is greatly reduced, and the service life of the whole machine is prolonged. The isolator supporting structure is low in cost, simple in structure, easy to assemble and suitable for mass production.

The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.