A noseless starter and its one-way device support structure

Abstract

A noseless starter motor and a one-way clutch support structure thereof, wherein the one-way clutch support structure comprises 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 comprises a thrust piece, which is arranged in a mounting hole at the rear end of a slide seat of a one-way clutch, wherein the thrust piece comprises a thrust pad and a needle bearing, wherein the thrust pad comprises a first outer cylindrical surface, a second outer cylindrical surface, a third outer cylindrical surface and a thrust inner hole which are coaxially arranged, wherein the needle bearing is installed in the thrust inner hole, and the shaft end of the armature shaft of the noseless starter motor is installed on the needle bearing, wherein a first shaft shoulder is formed between the first outer cylindrical surface and the second outer cylindrical surface, and a second shaft shoulder is formed between the first outer cylindrical surface and the third outer cylindrical surface, wherein the mounting hole is arranged as a stepped hole corresponding to the thrust pad, wherein the first shaft shoulder forms an axial positioning with the stepped end surface of the stepped hole, and wherein the first outer cylindrical surface and the second outer cylindrical surface are respectively clearance-fitted with the stepped hole.

Description

Technical Field

[0001] The invention relates to a noseless reduction starter motor, in particular to a noseless starter motor with a one-way device for a heavy diesel engine which can only rotate but not be driven out and has double supporting points and a one-way device supporting structure thereof. Background Art

[0002] Currently, starters used in commercial vehicles are mainly divided into two types: nose-type starters and noseless starters according to the structural design of the mechanical system. Noseless starters are favored by the global market and customers due to their high sealing performance, strong environmental adaptability and easier physical matching.

[0003] The traditional noseless starter is not as stable as the nosed starter because the entire one-way device is in a cantilevered support state after the drive gear is driven out. There is only one support point between the gear shaft and the bearing inside the front cover. In some heavy load applications, the gear shaft of the traditional noseless starter will bend and deform due to poor support stability when the engine is dragged by the engine, causing the drive gear to retreat and affecting the sealing effect of the oil seal between the gear shaft and the drive end cover. For some wet flywheel housing applications, such flexural deformation has a great impact on the sealing reliability of the starter. And because the one-way device of the traditional starter is axially movable as a whole, coupled with parts such as the drive gear, the mass of the entire moving pair is very large, and a larger electromagnetic switch is required to provide sufficient electromagnetic force to quickly drive the entire moving pair out.

[0004] With the continuous improvement of global energy conservation and environmental protection requirements, there is an urgent need for a new type of noseless starter, which, in addition to having better support stability, namely double support points, also needs to reduce the mass of the moving pair as much as possible to match a smaller electromagnetic switch design, thereby reducing the mass of the noseless starter as a whole, improving the power-to-weight ratio and efficiency of the starter, and meeting the increasingly stringent requirements of energy conservation and emission reduction.

[0005] Figure 1 It is a partial cross-sectional view of the prior art isolator support structure. Figure 1As shown, the core support system of the starter is composed of the following parts: a one-way device 100, a middle cover 110, an output shaft 120, a thrust pad 130, an armature 140, a gear chamber cover 150, a planetary gear 160, etc. The front end of the output shaft 120 is supported by the bearing inside the front cover of the starter, and the rear end is supported by the inner ring 101 of the one-way device 100 through a spiral spline connection, while the front end of the one-way device 100 is supported by the needle bearing of the inner ring 101 and the middle cover 110. After being driven out, the output shaft 120 is firmly supported by the above two support points. The premise of this stable support is that the one-way device 100, which is involved in supporting the rear end of the output shaft 120, must be firmly supported as a whole. In this structure, the front end support of the one-way device 100 is formed by the needle bearings of the one-way device inner ring 101 and the middle cover 110, which is fine; while the rear end support of the one-way device 100 is formed by the shaft head of the armature shaft 140 and the thrust pad 130 together with the one-way device inner ring 101 and the bushing 103 pressed on the rear end of the one-way device slide seat 102. There is no bearing between the armature shaft 140 and the thrust pad 130, and the axial positioning of the thrust pad 130 is mainly formed by its thin annular shoulder and the end face of the one-way device inner ring 101, which is very unreliable and more prone to fracture failure. The front end support of the armature shaft 140 is mainly supported by the bearing 141 pressed on the front end of the armature sun gear and the gear chamber cover 150 installed on the inner stop of the middle cover 110 to form a neck support; and the gear chamber cover 150 is a stamped part with a complicated structure and cannot be heat treated, so its strength and hardness are relatively low. During the operation of the starter, especially when it is reversely dragged by the engine, the four planetary gears 160 rotate at high speed and move axially, which can easily deform or even break the gear chamber cover 150, resulting in failure of the front end support of the armature shaft 140, thereby causing failure of the rear end support of the one-way clutch 100, and further causing failure of the entire starter support system, and the starter is forced to stop working. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a noseless starter with high stability and reliability and a one-way device supporting structure thereof.

[0007] In order to achieve the above object, the present invention provides a one-way device support structure of a noseless starter motor, which is used for an extra-heavy one-way clutch with double-row rollers, wherein the one-way device support structure comprises a one-way device front end support structure and a one-way device rear end support structure, wherein the one-way device rear end support structure comprises:

[0008] A thrust piece is arranged in a mounting hole at the rear end of the slide seat of the extra-heavy one-way clutch, the thrust piece includes a thrust pad and a needle bearing, the thrust pad includes a first outer cylindrical surface, a second outer cylindrical surface, a third outer cylindrical surface and a thrust inner hole which are coaxially arranged, the needle bearing is installed in the thrust inner hole, the shaft end of the armature shaft of the noseless starter motor is installed on the needle bearing, a first shaft shoulder is formed between the first outer cylindrical surface and the second outer cylindrical surface, a second shaft shoulder is formed between the first outer cylindrical surface and the third outer cylindrical surface, the mounting hole is arranged as a stepped hole corresponding to the thrust pad, the first shaft shoulder forms an axial positioning with the stepped end surface of the stepped hole, and the first outer cylindrical surface and the second outer cylindrical surface are respectively clearance-fitted with the stepped hole.

[0009] The above-mentioned isolator support structure of the noseless starter motor also includes a quenching gasket, which is arranged between the first end face of the thrust pad and the sun gear end face of the armature shaft.

[0010] In the above-mentioned isolator support structure of the noseless starter motor, an oil storage groove is also provided on the first end face of the thrust pad for storing grease to reduce the wear caused by the relative rotation between the first end face and the quenching gasket.

[0011] In the above-mentioned isolator support structure of the noseless starter motor, the fitting clearance between the second outer cylindrical surface and the stepped hole is smaller than the fitting clearance between the first outer cylindrical surface and the stepped hole.

[0012] In the above-mentioned isolator support structure of the noseless starter motor, the needle roller bearing is pressed into the thrust inner hole from one side of the second end surface of the thrust pad, and the end surface of the needle roller bearing is flush with the second end surface.

[0013] The above-mentioned one-way clutch support structure of the noseless starter motor, wherein the front end support structure of the one-way clutch 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 installed and supported on the middle cover of the noseless starter motor through the middle cover needle bearing.

[0014] The above-mentioned isolator support structure of the noseless starter motor, wherein the side of the armature shaft close to the shaft end is supported and installed on the inner hole of the gear chamber cover plate of the noseless starter motor.

[0015] In the above-mentioned isolator support structure of the noseless starter motor, a ball bearing is pressed into the root of the sun gear of the armature shaft, and the ball bearing is installed on the inner hole of the gear chamber cover plate.

[0016] The above-mentioned one-way clutch support structure of the noseless starter motor, wherein a friction plate is also arranged between the gear chamber cover plate and the planetary gear chamber of the noseless starter motor, the friction plate is mounted on the inner stopper of the middle cover, and a positioning opening for circumferential positioning and stopping is arranged on the circumference of the friction plate.

[0017] In order to better achieve the above-mentioned purpose, the present invention also provides a noseless starter motor, which includes the above-mentioned isolator support structure.

[0018] The technical effects of the present invention are:

[0019] 1. The present invention sets a needle bearing on a thrust pad, connects the armature and the non-return device through the thrust pad, and the armature shaft at the front end of the armature supports the thrust pad. The thrust pad provides reliable radial support for the rear end of the non-return device through the armature shaft, so that the non-return device can only rotate but not move. This can completely solve the problem of unstable support structure of the non-return device in the prior art, which cannot provide stable and reliable support for the non-return device with heavy double-row rollers of large mass and thus causes early failure.

[0020] 2. By installing a hardened friction plate between the gear chamber cover and the planetary gear chamber, the problem of the gear chamber cover being damaged by the high-speed rotation and axial movement of the planetary gears during the operation of the starter is solved due to the low hardness of the stamped gear chamber cover, thereby improving the stability and durability of the entire support system;

[0021] 3. A quenched steel gasket is installed between the thrust pad and the armature shaft sun gear of the present invention, and the thrust pad itself is made of powder metallurgy material. An oil storage tank is designed on the second end face of the thrust pad, which greatly reduces the wear of the thrust pad, the check valve and the armature shaft, and increases the service life of the whole machine;

[0022] 4. The support structure of the present invention is simple in structure, easy to assemble, and low in cost, and is suitable for mass production.

[0023] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments, but is not intended to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a partial cross-sectional view of a prior art isolator support structure;

[0025] Figure 2 It is a schematic diagram of the structure of a noseless starter according to an embodiment of the present invention (stationary state);

[0026] Figure 3 A cross-sectional view of a noseless starter according to an embodiment of the present invention;

[0027] Figure 4A cross-sectional view of a support structure of a isolator according to an embodiment of the present invention;

[0028] Figure 5 A cross-sectional view of an output shaft support structure according to an embodiment of the present invention;

[0029] Figure 6 A cross-sectional view of a thrust member according to an embodiment of the present invention;

[0030] Figure 7 The figure is a schematic diagram of the friction plate structure according to an embodiment of the present invention.

[0031] Among them, the reference numerals

[0032] Prior art

[0033] 100 one-way device

[0034] 101 one-way device inner ring

[0035] 102 one-way device slide

[0036] 103 Bushing

[0037] 110 middle cover

[0038] 120 output shaft

[0039] 130 thrust pad

[0040] 140 Armature

[0041] 141 bearings

[0042] 150 gear room cover

[0043] 160 planetary gear

[0044] The present invention

[0045] 1 Stator

[0046] 2Front cover

[0047] 3 One-way clutch

[0048] 31 Slide

[0049] 32 mounting holes

[0050] 33 step end face

[0051] 34 Inner ring shaft

[0052] 4 Middle cover

[0053] 41 middle cover needle roller bearing

[0054] 42stop

[0055] 5 Output shaft

[0056] 6Thrust piece

[0057] 61 thrust pad

[0058] 62 Needle Roller Bearing

[0059] 63 first outer surface

[0060] 64 second outer surface

[0061] 65 third outer surface

[0062] 66 first end face

[0063] 661 oil tank

[0064] 67 Second end face

[0065] 68 first shoulder

[0066] 69 Second shoulder

[0067] 60 thrust inner hole

[0068] 7 Armature

[0069] 71 armature shaft

[0070] 72 shaft end

[0071] 73 Sun gear

[0072] 74 sun gear end face

[0073] 75 ball bearings

[0074] 8Quenching gasket

[0075] 9Gear chamber cover

[0076] 91 inner hole

[0077] 10 Friction plate

[0078] 101 positioning port

[0079] 11 Fork

[0080] 12 front bearings

[0081] 13 Back cover

[0082] 14 Electromagnetic switch

[0083] 15 driving gear

[0084] 16Planetary gear DETAILED DESCRIPTION

[0085] The structural principle and working principle of the present invention are described in detail below in conjunction with the accompanying drawings:

[0086] See also Figure 2 and Figure 3 , Figure 2 Schematic diagram of the noseless starter structure (stationary state) according to an embodiment of the present invention. Figure 3 The figure is a cross-sectional view of a noseless starter according to an embodiment of the present invention. The starter according to the present invention can be applied to heavy-duty and extra-heavy-duty commercial vehicles. The noseless starter is formed of a support frame formed by a front cover 2, a middle cover 4 and a rear cover 13 arranged in sequence. The output shaft 5 is mounted and supported on the front cover 2 and the middle cover 4. The shaft end 72 of the output shaft 5 is mounted with a driving gear 15. The stator 1 and the armature 7 are mounted between the rear cover 13 and the middle cover 4. The output shaft 5 is connected to the electromagnetic switch 14 through a shift fork 11. The electromagnetic switch 14 can be mounted on the middle cover 4. The front end support of the output shaft 5 relies on the front bearing 12 pressed on the front cover 2. The rear end support of the output shaft 5 relies on the outer end of the inner ring shaft 34 of the one-way clutch 3 and the middle cover needle bearing 41 in the middle cover 4 to form a reliable radial support. The one-way clutch 3 is preferably an extra-heavy one-way clutch with double rows of rollers. When working, the electromagnetic switch 14 pulls out the output shaft 5 through the fork 11, and the output shaft 5 drives forward with the driving gear 15 to mesh with the engine flywheel ring gear, while the one-way clutch 3 only rotates circumferentially and does not move axially with the output shaft 5; the output shaft 5 has two supporting points to form reliable support when it is at rest and in the extended position. The composition, structure, relative position relationship and connection relationship of other parts of the noseless starter and their working principles are all relatively mature existing technologies, so they will not be described here in detail. Only the one-way clutch support structure of the present invention is described in detail below.

[0087] See also Figure 4 and Figure 5 , Figure 4 is a cross-sectional view of a support structure of a isolator according to an embodiment of the present invention, Figure 5 The output shaft support structure of one embodiment of the present invention is a cross-sectional view. The one-way device support structure of the noseless starter motor of the present invention is used for an extra-heavy-duty one-way clutch with double-row rollers. The one-way device support structure includes a one-way device front end support structure and a one-way device rear end support structure. The one-way device front end support structure is arranged at the outer end of the inner ring shaft 34 of the one-way clutch 3. The outer end of the inner ring shaft 34 is supported and mounted on the middle cover 4 of the noseless starter motor through a middle cover needle bearing 41. The one-way device rear end support structure includes: a thrust piece 6, which is arranged in the mounting hole 32 at the rear end of the slide seat 31 of the extra-heavy-duty one-way clutch. See Figure 6 , Figure 6The thrust member 6 of one embodiment of the present invention is a cross-sectional view. The thrust member 6 includes a thrust pad 61 and a needle bearing 62. The thrust pad 61 is preferably a powder metallurgy material. The thrust pad 61 includes a first outer cylindrical surface 63, a second outer cylindrical surface 64, a third outer cylindrical surface 65 and a thrust inner hole 60 which are coaxially arranged. The needle bearing 62 is installed in the thrust inner hole 60. The shaft end 72 of the armature shaft 71 of the noseless starter motor is installed on the needle bearing 62. The armature shaft 71 is supported and installed on the inner hole 91 of the gear chamber cover plate 9 of the noseless starter motor on one side of the armature shaft 71 close to the shaft end 72. Specifically, the armature shaft 71 can be supported and installed on the inner hole 91 of the gear chamber cover plate 9 of the noseless starter motor. A ball bearing 75 is pressed into the root of the sun gear 73 of the gear chamber 71, and 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 cylindrical surface 63 and the second outer cylindrical surface 64, and a second shaft shoulder 69 is formed between the first outer cylindrical surface 63 and the third outer cylindrical surface 65. The mounting hole 32 is set as a stepped hole corresponding to the thrust pad 61. The first shaft shoulder 68 forms an axial positioning with the stepped end surface 33 of the mounting hole 32. The first outer cylindrical surface 63 and the second outer cylindrical surface 64 are respectively clearance-matched with the stepped hole. The clearance between the second outer cylindrical surface 64 and the stepped hole is smaller than the clearance between the first outer cylindrical surface 63 and the stepped hole.

[0088] This embodiment may also include a quenching gasket 8, preferably a quenching steel gasket, which is arranged between the first end face 66 of the thrust pad 61 and the sun gear end face 74 of the armature shaft 71. Both sides of the quenching gasket 8 are coated with grease to reduce the wear between the sun gear end face 74 of the armature 7 and the first end face 66 of the thrust pad 61. An oil storage tank 661 is also arranged on the first end face 66 of the thrust pad 61 to store grease to reduce the wear caused by the relative rotation between the first end face 66 and the quenching gasket 8. The needle bearing 62 is pressed into the thrust inner hole 60 from the side of the second end face 67 of the thrust pad 61, and the end face of the needle bearing 62 is flush with the second end face 67, and there is a certain gap between the other end face of the needle bearing 62 and the first end face 66 of the thrust pad 61. The first shaft shoulder 68 of the thrust pad 61 is an axial positioning surface of the thrust pad 61 , and cooperates with the stepped end surface 33 of the mounting hole 32 of the sliding seat 31 of the isolator 3 .

[0089] See also Figure 7 , Figure 7It is a schematic diagram of the structure of the friction plate 10 of an embodiment of the present invention. A friction plate 10 may also be arranged between the gear chamber cover plate 9 and the planetary gear chamber of the noseless starter motor. The friction plate 10 is mounted on the inner stop 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 this embodiment, the rear end support of the one-way clutch 3 with double-row rollers is completed by the stepped hole at the rear end of the slide seat 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 the middle cover needle bearing 41 in the middle cover 4; the second outer cylindrical surface 64 of the thrust pad 61 is clearance-matched with the stepped hole of the slide seat 31 of the one-way clutch 3, and the first shaft shoulder 68 of the thrust pad 61 is clearance-matched with the slide seat 31 of the one-way clutch 3. 1 forms an axial positioning, the root of the sun gear 73 of the armature 7 is pressed with a ball bearing 75, and forms a 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 gear end face 74 and the first end face 66 of the thrust pad 61; a quenching gasket 8 is installed between the armature shaft 71 and the thrust pad 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 the inner stop 42 of the middle cover 4. The friction plate 10 is preferably a quenched part with high strength and hardness. It is arranged between the gear chamber cover plate 9 and the planetary gear 16, which can completely eliminate the damage to the gear chamber cover plate 9 caused by the high-speed rotation and axial movement of the planetary gear 16, so that the gear chamber cover plate 9 can provide effective and stable support for the front end of the armature shaft 71, so that the front end of the armature shaft 71 can provide reliable and effective support for the rear end of the one-way clutch 3 through the thrust pad 61, thereby greatly improving the support stability and strength of the whole machine.

[0090] The present invention is suitable for a noseless starter with a one-way clutch that can only rotate but not strike out and has double supporting points. The rear end support of the one-way clutch 3 that can only rotate but not move is completed by the rear end stepped hole of the slide seat 31, the thrust piece 6 and the shaft end 72 of the armature shaft 71; the thrust pad 61 is press-fitted with a needle bearing 62 and is installed in the rear end mounting hole 32 of the slide seat 31 of the one-way clutch; the rear end of the one-way clutch 3 forms a reliable radial rotation support with the front shaft end 72 of the armature 7 through the independent thrust piece 6. The thrust pad 61 is preferably stepped, and the diameter of the second outer cylindrical surface 64 is smaller than the diameter of the first outer cylindrical surface 63; the second outer cylindrical surface 64 of the thrust pad 61 and the rear end stepped hole of the slide seat 31 are matched with a small clearance; the first outer cylindrical surface 63 of the thrust pad 61 and the rear end stepped hole of the slide seat 31 are matched with a large clearance; the first shaft shoulder 68 of the thrust pad 61 and the stepped end surface 33 of the slide seat 31 form an axial positioning.

[0091] The present invention sets the needle bearing 62 on the thrust pad 61, and then connects the armature shaft 71 and the one-way clutch 3 through the thrust pad 61. The shaft end 72 of the armature shaft 71 supports the thrust piece 6. 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 can only rotate without moving. This can completely solve the problem of the unstable support structure of the one-way device in the prior art, which cannot provide stable and reliable support for the heavy-duty double-row roller one-way device with a large mass and causes early failure; and by assembling a hardened friction plate between the gear chamber cover plate 9 and the planetary gear chamber. 10, solves the problem that the gear chamber cover plate 9 is damaged by the high-speed rotation and axial movement of the planetary gear 16 during the operation of the starter due to the low hardness of the stamped gear chamber cover plate 9, and improves the stability and durability of the entire support system; at the same time, a quenching gasket 10 made of steel is installed between the thrust pad 61 and the sun gear 73, and the thrust pad 61 itself is preferably made of powder metallurgy material, and there is an oil storage tank 661 on the first end face 66 of the thrust pad 61, which greatly reduces the wear of the thrust pad 61, the one-way clutch 3 and the armature shaft 71, and improves the service life of the whole machine. The one-way clutch support structure has low cost, simple structure, easy assembly, and is suitable for mass production.

[0092] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A one-way clutch support structure for a noseless starter motor, used for a heavy-duty one-way clutch with double-row rollers, the one-way clutch support structure comprising a one-way clutch front end support structure and a one-way clutch rear end support structure, characterized in that: The isolator rear end support structure comprises: A thrust piece is arranged in a mounting hole at the rear end of the slide seat of the one-way clutch, the thrust piece includes a thrust pad and a needle bearing, the thrust pad includes a first outer cylindrical surface, a second outer cylindrical surface, a third outer cylindrical surface and a thrust inner hole which are coaxially arranged, the needle bearing is installed in the thrust inner hole, the shaft end of the armature shaft of the noseless starter motor is installed on the needle bearing, and the side support of the armature shaft close to the shaft end is installed on the inner hole of the gear chamber cover plate of the noseless starter motor; the first outer cylindrical surface is located in the middle, and the second outer cylindrical surface is located in the middle. The first outer cylindrical surface and the third outer cylindrical surface are respectively located on both sides of the first outer cylindrical surface, and the third outer cylindrical surface is located on the side close to the armature shaft; a first shaft shoulder is formed between the first outer cylindrical surface and the second outer cylindrical surface, and a second shaft shoulder is formed between the first outer cylindrical surface and the third outer cylindrical surface, the mounting hole is set as a stepped hole corresponding to the thrust pad, the first shaft shoulder is located on the side away from the armature shaft, and abuts against the stepped end surface of the stepped hole to form axial positioning, and the first outer cylindrical surface and the second outer cylindrical surface are respectively clearance-matched with the stepped hole; The diameter of the third outer cylindrical surface is smaller than the diameter of the second outer cylindrical surface, and the diameter of the second outer cylindrical surface is smaller than the diameter of the first outer cylindrical surface.

2. The isolator support structure of the noseless starter motor as claimed in claim 1, characterized in that: It also includes a quenching gasket, which passes through the shaft end of the armature shaft and is arranged between the first end face of the thrust pad and the sun gear end face of the armature shaft, the first end face is an end face that intersects the third outer cylindrical surface perpendicularly, and the sun gear end face of the armature shaft is adjacent to the shaft end of the armature shaft.

3. The isolator support structure of the noseless starter motor as claimed in claim 2, characterized in that: The first end surface of the thrust pad is also provided with an oil storage groove for storing grease to reduce the wear caused by the relative rotation between the first end surface and the quenching pad.

4. The isolator support structure of the noseless starter motor according to claim 1 or 2, characterized in that: The fitting clearance between the second outer cylindrical surface and the stepped hole is smaller than the fitting clearance between the first outer cylindrical surface and the stepped hole.

5. The isolator support structure of the noseless starter motor according to claim 1 or 2, characterized in that: The needle roller bearing is pressed into the thrust inner hole from one side of the second end surface of the thrust pad, and the end surface of the needle roller bearing is flush with the second end surface.

6. The isolator support structure of the noseless starter motor according to claim 1 or 2, characterized in that: The front end support structure of the one-way clutch 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 supported on the middle cover of the noseless starter motor through the middle cover needle bearing.

7. The isolator support structure of the noseless starter motor as claimed in claim 1, characterized in that: A ball bearing is press-fitted on 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.

8. The isolator support structure of the noseless starter motor as claimed in claim 1, characterized in that: A friction plate is also arranged between the gear chamber cover plate and the planetary gear chamber of the noseless starter motor. The friction plate is mounted on the inner stop of the middle cover of the noseless starter motor, and a positioning opening for circumferential positioning and stopping is arranged on the circumference of the friction plate.

9. A noseless starter motor, characterized in that: The isolator support structure comprises the isolator support structure as described in any one of claims 1-8.

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