A starter motor reduction mechanism and motor thereof

Abstract

The application provides a starting motor deceleration mechanism and an assembling method thereof, which comprises a sun gear, a planet gear, an inner ring gear and a pinion; the planet gear is engaged with the inner ring gear and the sun gear to form a planet gear, bearings and a bearing are arranged between the planet gear and a planet shaft to support transmission, a planet shaft sleeve is arranged between the planet shaft and the bearing, the planet shaft sleeve is in transition or clearance fit with the bearing, and the planet shaft sleeve is in interference fit with the planet shaft. The planet gear structure provides structural support under a large linear speed condition, and the planet shaft sleeve structure and the bearing fit to meet the assembly and use requirements, thereby helping to solve the technical problem of interference assembly under the condition that the bearings are arranged separately.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of starting diesel engine for ship, in particular to a starting motor deceleration mechanism and a motor thereof. BACKGROUND

[0002] At present, the small and medium cylinder diesel engine for ship is started by starting motor, and the starting motor needs to output large torque when starting the diesel engine for ship, and the function of the deceleration mechanism is to reduce the rotating speed of the power input side and increase the torque, so as to ensure the smooth progress of the starting process. The deceleration mechanism is usually composed of one-stage planetary deceleration and two-stage parallel external meshing gear deceleration, and the stable and reliable operation of the deceleration mechanism requires reasonable gear support mode, sufficient gear strength, good lubrication, and good axial positioning of transmission parts. However, the existing deceleration structure is difficult to meet the sealing and strength requirements under large linear speed.

[0003] Therefore, there is an urgent need for a starting motor deceleration mechanism and a motor thereof, which can help to solve the technical problem that there is no deceleration structure under large linear speed in the prior art. SUMMARY

[0004] In an embodiment, the present application provides a starting motor deceleration mechanism, which provides structural support for large linear speed conditions through a planetary gear structure, and meets the structural strength requirements under large linear speed through the cooperation between the planetary shaft sleeve and the bearing, thereby helping to solve the technical problem that there is no deceleration structure under large linear speed in the prior art.

[0005] The starting motor deceleration mechanism comprises an inner ring gear, a sun gear and a planetary gear.

[0006] The planetary gear is meshed with the inner ring gear and the sun gear to form a planetary gear, the planetary gear and its planetary shaft are supported and transmitted by bearings, a planetary shaft sleeve is arranged between the planetary shaft and the bearing, the planetary shaft sleeve and the bearing are in transition or gap cooperation, and the planetary shaft sleeve and the planetary shaft are in interference fit.

[0007] In an embodiment, the inner ring of the inner ring gear has a meshing internal gear, the meshing gear is meshed with the planetary gear, and a first meshing gear is formed at one end of the inner ring gear.

[0008] The first meshing gear is meshed with the second meshing gear.

[0009] In an embodiment, the transition taper surface of the middle part of the one end of the inner ring gear is extended rearward to form an extended shaft, and the first meshing gear is sleeved on the extended shaft.

[0010] In an embodiment, the inner ring gear is arranged in a support structure, and the extended shaft extends out of the support structure.

[0011] The starter motor reduction mechanism also includes an oil separator;

[0012] The oil separator is sleeved outside the protruding shaft and fixed to the support structure to isolate the protruding shaft.

[0013] In one embodiment, an oil seal and a retaining ring are fitted inside the oil separator disc;

[0014] The cone surface is provided with weight reduction holes.

[0015] In one embodiment, the end of the protruding shaft is connected to an external structure;

[0016] A combined retaining ring is provided between the external structure and the first meshing gear;

[0017] The combined retaining ring includes a first half-circle combined retaining ring and a second half-circle combined retaining ring;

[0018] The first half-circle combined retaining ring and the second half-circle combined retaining ring surround the protruding shaft and are fixed by bolt connection.

[0019] In one embodiment, a retaining ring is sleeved on the protruding shaft between the combined retaining ring and the first meshing gear.

[0020] In one embodiment, the bearing is a deep groove ball bearing.

[0021] In one embodiment, there are two bearings, and a bearing positioning sleeve is provided between them.

[0022] In one embodiment, the present invention provides an assembly method for a starter motor reduction mechanism, based on the starter motor reduction mechanism as described above, the assembly method comprising:

[0023] Cool the planetary shaft;

[0024] The cooled planetary shaft inner sleeve is inserted into the planetary shaft sleeve, and an interference fit is achieved after the temperature recovers. Attached image description:

[0025] Figure 1 This is a schematic diagram of a starter motor reduction mechanism in one embodiment of the present invention;

[0026] Figure 2 In another embodiment of the present invention Figure 1 A magnified view of part D in the diagram;

[0027] Figure 3 In another embodiment of the present invention Figure 1 Schematic diagram of the cross-sectional structure of S1-S1.

[0028] Reference signs:

[0029] Inner gear ring 1

[0030] Conical surface 101

[0031] Weight-reducing hole 1011

[0032] Extension shaft 102

[0033] Supporting structure 103

[0034] External structure 104

[0035] Oil separation disc 2

[0036] Retaining ring 3

[0037] Oil seal 4

[0038] First meshing gear 5

[0039] Second meshing gear 501

[0040] Combined retaining ring 6

[0041] First half combined retaining ring 61

[0042] Second half combined retaining ring 62

[0043] Bearing 7

[0044] Planetary shaft 8

[0045] Planetary shaft sleeve 9

[0046] Bearing positioning sleeve 10

[0047] Retaining ring 11

[0048] Bolt 12

[0049] Sun gear 13

[0050] Planetary gear 14 DETAILED DESCRIPTION

[0051] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be described in detail below in combination with the drawings and specific embodiments.

[0052] The various aspects and features of the present application are described herein with reference to the accompanying drawings.

[0053] These and other characteristics of the present application will become apparent from the following description of the preferred forms given, by way of non-limiting example, with reference to the attached drawings.

[0054] It should also be understood that although this application has been described with reference to some specific examples, those skilled in the art can certainly implement many other equivalent forms of this application, which have the features described in the claims and are therefore all within the scope of protection defined herein.

[0055] The above and other aspects, features and advantages of this application will become more apparent when taken in conjunction with the accompanying drawings and in view of the following detailed description.

[0056] Specific embodiments of this application are described below with reference to the accompanying drawings; however, it should be understood that the claimed embodiments are merely examples of this application, which can be implemented in various ways. Well-known and / or repeated functions and structures are not described in detail to ascertain the true intent based on the user's historical operations, and to avoid unnecessary or redundant details that would obscure this application. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but merely serve as the basis and representative basis for the claims to teach those skilled in the art to use this application in various ways with substantially any suitable detailed structure.

[0057] This specification may use the phrases “in one embodiment,” “in another embodiment,” “in yet another embodiment,” or “in other embodiments,” all of which may refer to one or more of the same or different embodiments according to this application.

[0058] To achieve effective gear support, good lubrication, and reliable axial positioning at high speeds, a structural scheme for a starter motor reduction mechanism is proposed.

[0059] This invention proposes a high-power, high-transmission-ratio starter motor reduction structure, achieving reliable speed reduction and torque increase in the starter motor. This invention features high space utilization, a compact structure, and light weight, while also incorporating advantages such as reliable planetary bearing support (reliable planetary shaft installation), effective oil sealing, and a retaining ring structure free from abnormal journal wear, significantly improving operational reliability.

[0060] Figure 1 This is a schematic diagram of a starter motor reduction mechanism in one embodiment of the present invention; Figure 2 In another embodiment of the present invention Figure 1 A magnified view of part D in the diagram; Figure 3 In another embodiment of the present invention Figure 1 A schematic diagram of the cross-sectional structure between S1 and S1. Figures 1 to 3 As shown, in one embodiment, the present invention provides a starter motor reduction mechanism, which includes an internal gear ring 1, a sun gear 13, and planet gears 14;

[0061] The planet wheel 14 is in mesh with the inner gear ring 1 and the sun wheel 13 respectively, and the planet wheel 14 and the planet shaft 8 thereof are supported by the bearing 7, the planet shaft 8 and the bearing 7 are provided with the planet shaft sleeve 9, the planet shaft sleeve 9 and the bearing 7 are in transition or clearance fit, and the planet shaft sleeve 9 and the planet shaft 8 are in interference fit.

[0062] Working principle: under the driving of compressed air, the sun wheel 13 rotates, the sun wheel 13 drives the planet wheel 14 and the inner gear ring 1 to rotate, the rotating speed is reduced and the torque is increased; the inner gear ring is connected with the first meshing gear through the spline, the first meshing gear drives the secondary reduction gear to rotate, and the speed reduction and torque increase functions are further realized.

[0063] In the embodiment, the specific structure of the starting motor speed reduction mechanism is provided, the key is that the outer side and the inner side of the planet shaft sleeve 9 are provided with two different tolerance fits respectively, the planet shaft 8 can be cold assembled after the diameter is reduced at low temperature to finally realize the interference fit, the main purpose is to prevent the relative movement between the planet shaft sleeve 9 and the planet shaft 8, and the axial gap caused by the positioning sleeve between the two bearings, and the deflection is easy to form and directly knock on the inner ring of the other bearing, causing the installation jam and reducing the service life of the bearing, so as to reduce the damage when the linear velocity is large, which helps to solve the technical problem that there is no speed reduction structure under large linear velocity in the prior art.

[0064] In an embodiment, the inner ring of the inner gear ring 1 is provided with a meshing internal gear, the meshing gear is in mesh with the planet wheel 14, and the inner ring of the inner gear ring 1 is extended at one end to form the first meshing gear 5 arranged behind;

[0065] The first meshing gear 5 is in mesh with the second meshing gear 501.

[0066] In an embodiment, the transition conical surface 101 of the middle part of the one end of the inner gear ring 1 is extended to form the extended shaft 102, and the first meshing gear 5 is sleeved on the extended shaft 102.

[0067] In an embodiment, the inner gear ring 1 is arranged in the support structure 103, and the extended shaft 102 extends out of the support structure 103.

[0068] The starting motor speed reduction mechanism further comprises an oil separation disc 2.

[0069] The oil separation disc 2 is sleeved on the outside of the extended shaft 102 and fixed on the support structure 103 to separate the extended shaft 102.

[0070] In an embodiment, the oil seal 4 and the retainer 3 are sleeved in the oil separation disc 2.

[0071] The conical surface 101 is provided with a lightening hole 1011. The lightening hole 1011 not only can reduce the self weight of the inner gear ring 1, but also can pass through the tool to install the oil seal 4 and the retainer 3 in the oil separation disc 2.

[0072] In an embodiment, the end of the extension shaft 102 is connected to the external structure 104;

[0073] The external structure 104 is provided with a combined check ring 6 between the first meshing gear 5;

[0074] The combined check ring 6 comprises a first half check ring 61 and a second half check ring 62;

[0075] The first half check ring 61 and the second half check ring 62 embrace the extension shaft 102 and are fixed by the bolt 12.

[0076] In the embodiment, the installation can be performed in a smaller case.

[0077] In an embodiment, a sleeving check ring 11 is sleeved on the extension shaft 102 between the combined check ring 6 and the first meshing gear 5. The sleeving check ring 11 in the embodiment is a check ring with two anti-loosening and dynamic unbalance small opposite installations.

[0078] In an embodiment, the bearing 7 is a deep groove ball bearing, and the number is two.

[0079] In an embodiment, the bearing 7 is two, and a bearing positioning sleeve 10 is arranged therebetween.

[0080] The overall structure is compact, the space utilization rate is high, and the structure is still reliable and sealed at a high linear speed.

[0081] In an embodiment, the application further provides an assembling method of a starting motor reduction mechanism, based on the starting motor reduction mechanism, the assembling method comprises:

[0082] Cooling the planetary shaft 8;

[0083] Sleeving the cooled planetary shaft 8 into the planetary shaft sleeve 9, and realizing interference fit after temperature recovery to normal temperature.

[0084] The technical points of the above structure are mainly summarized as follows:

[0085] Two-stage reduction, planetary first-stage reduction oil lubrication cooling, and second-stage reduction grease lubrication.

[0086] Isolation disc and gear ring weight reduction hole, and disassembly and assembly structure.

[0087] Double rolling bearing and check ring limiting.

[0088] Planetary shaft double-layer structure, facilitating assembly.

[0089] Combined dynamic balance check ring.

[0090] In order to reduce the linear speed of the oil seal 4, avoid the problems of wear and tear and sealing failure caused by too large linear speed, and reduce the shaft neck diameter of the inner ring gear 1, the outer diameter of the oil seal is matched with the inner diameter of the oil screen 2. The oil screen is fixed on the reducer shell through the mounting screws in the lightening holes of the inner ring gear. The retaining ring 3 is installed in the groove of the oil screen to limit the axial displacement of the oil seal.

[0091] The axial position of the first meshing gear 5 is constrained by the combined retaining ring 6, and the two retaining rings 11 and the screws 12 are connected between the retaining rings. The retaining ring is positioned by being attached to the shoulder processed on the inner ring gear. Two screws are oppositely installed to reduce the imbalance caused by rotation.

[0092] Each inner ring of the planetary gear is supported by two deep groove ball bearings 7 (a single deep groove ball bearing cannot provide sufficient support, and if a larger size bearing is used, the size will increase), and the bearing positioning sleeve 10 is used between the two bearings to provide better axial positioning and ensure good lubrication between the bearings under high speed operation. In order to facilitate installation, the planetary shaft sleeve 9 is adopted in the patent to realize the installation of the planetary shaft to provide reliable support for the bearing: the outer diameter of the planetary shaft sleeve is matched with the inner diameter of the planetary carrier (in the cold state, sufficient gap can be achieved); the inner diameter of the planetary shaft sleeve is matched with the outer diameter of the planetary shaft (in the cold state of the planetary shaft, small gap). The outer and inner rings of the planetary shaft sleeve have long guide sections, and due to the sufficient gap in the cold state, the planetary shaft sleeve is installed without jamming. After the planetary shaft sleeve returns to room temperature, the planetary shaft can be knocked in. Due to the temperature change, the thin-walled planetary shaft sleeve will expand and achieve the purpose of interference fit with the planetary carrier.

[0093] The high-speed planetary gear train gear adopts splash lubrication due to high speed; the secondary reduction gear adopts grease lubrication, and how to form a reliable sealing and lubrication environment plays an important role in the stable operation of the starting motor. In order to reduce the shaft seal linear speed, the oil screen is designed on the inner ring gear, the oil screen is fixed on the shell through the mounting bolts in the lightening holes of the inner ring gear, the outer ring of the oil seal is matched with the inner diameter of the oil screen, the inner ring of the oil seal is matched with the inner ring gear, the shaft neck diameter of the inner ring gear is reduced, and thus the highest operating linear speed of the oil seal is reduced. Compared with the prior art, the oil seal design provided by the embodiment of the present application has the beneficial effects that: the arrangement is novel, the oil seal is installed by using the lightening holes of the ring gear, not only the disassembly and maintenance are good, but also the oil seal size can be reduced, the linear speed can be reduced, the abnormal wear problem of the shaft neck can be reduced, the oil seal function failure can be avoided, and the operation reliability is improved.

[0094] On the axial fixing mode of the first meshing gear, the commonly used is the integral ring-shaped retainer, and the connection structure is inconvenient to disassemble, increases the use difficulty, and reduces the practicability. The ring-shaped retainer generally realizes the axial positioning function through the friction force between the retainer and the shaft neck, and the axial gap is large, and in use, the shaft neck may be abnormally worn, expanded or even separated due to the axial movement and circumferential rotation of the retainer, thereby causing structural failure. The retainer adopted in the present application is a combined retainer, the retainer is positioned in the circumferential direction by being attached to the plane machined on the inner gear ring, and two screws are used to tighten the retainer 1 and the retainer 2 to fasten the retainer on the shaft. The two bolts are installed in opposition, so that the retainer is in a completely balanced state. Compared with the prior art, the beneficial effects of the retainer structure provided in the embodiment of the present application are: 1. the retainer has no axial movement and circumferential rotation relative to the shaft, effectively reducing the shaft neck wear; 2. reducing the imbalance caused by the non-closed and uneven thickness of the conventional retainer under high-speed rotation; 3. relying on the tightening of the bolts to reduce the risk of retainer disconnection under high-speed rotation.

[0095] In the support mode of the planetary gear, in order to improve the operation reliability, each planetary gear is supported by two deep groove ball bearings with high speed (a single deep groove ball bearing cannot provide sufficient support, i.e. the strength check fails; but if a larger size bearing is used, the size will increase), and the bearings are axially positioned by a bearing positioning sleeve, which also ensures good lubrication between the bearings under high-speed operation. If the bearing support shaft is cold-mounted according to the conventional method, since the outer diameter needs to be in interference fit with the inner hole of the planet carrier to prevent circumferential rotation, and there is an axial gap between the two bearings due to the positioning sleeve, it is easy to form a deflection and directly hit the inner ring of the other bearing, causing installation jamming and reducing the service life of the bearing. The present patent adopts a planetary shaft sleeve inside the planetary shaft, and relies on the deformation of the parts with temperature to indirectly realize the interference fit between the planetary shaft and the planet carrier. Compared with the prior art, the beneficial effects of the bearing support mode provided in the embodiment of the present application are: the assembly difficulty is greatly reduced, and the risk of damage to the bearing inner ring caused by knocking and the risk of reduced service life are prevented.

[0096] In order to realize effective support of the gear under high speed, good lubrication condition and reliable axial positioning, a structural scheme of a starting motor reduction mechanism is provided.

[0097] The power input drives the sun gear, the planet gear and the inner gear ring (collectively referred to as a planetary assembly) to rotate, the lubricating oil seal of the planetary assembly is sealed by an oil seal installed on the inner gear ring journal, the outer diameter of the oil seal is limited by a oil separation disc, and the baffle is installed in the groove of the oil separation disc to limit the axial displacement of the oil seal; the secondary reduction pinion is connected with the inner gear ring through the spline, in order to prevent the wear of the small diameter shaft shoulder of the combined baffle matched with the inner gear ring, the combined baffle is adopted to change the positioning surface into the boss of the inner gear ring, two screws are used to symmetrically tighten the two baffles, and the maximum axial displacement of the secondary reduction pinion is limited by the groove of the combined baffle installed on the inner gear ring. Considering the design reliability and assembly feasibility, when the planet gear is installed, since the double deep groove ball bearing and the positioning sleeve are used as the supporting mode, the planet shaft is installed in steps: 1. cold installation of the planet shaft sleeve (the planet shaft sleeve outer circle and the planet carrier inner hole are in transition or clearance fit); 2. after the planet shaft sleeve returns to normal temperature, the planet shaft is cold installed (the planet shaft outer circle and the planet shaft sleeve inner hole are in interference fit). After the planet shaft returns to normal temperature, the thin-walled planet shaft sleeve can be expanded to realize the interference fit between the planet shaft and the planet shaft sleeve, the planet shaft sleeve and the planet carrier, and realize effective bearing support.

[0098] The above examples are only exemplary embodiments of the present application and are not used to limit the present application, and the protection scope of the present application is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements to the present application within the spirit and protection scope of the present application, and such modifications or equivalent replacements are also regarded as falling within the protection scope of the present application.

Claims

1. A starter motor reduction mechanism characterized by, The starting motor reduction mechanism comprises: an inner ring (1); a sun gear (13); a planet gear (14) engaged with the inner ring (1) and the sun gear (13) respectively, the planet gear (14) and its planet shaft (8) are supported by bearings (7), the planet shaft (8) and the bearings (7) are provided with a planet shaft sleeve (9), the planet shaft sleeve (9) and the bearings (7) are clearance fit, and the planet shaft sleeve (9) and the planet shaft (8) are interference fit; the inner ring of the inner ring (1) has an engagement inner gear, the engagement inner gear is engaged with the planet gear (14), and the inner ring (1) has a first engagement gear (5) at one end; the first engagement gear (5) is engaged with a second engagement gear (501); the transition taper surface (101) of the inner ring (1) is extended to form an extension shaft (102) at the middle of the one end, and the first engagement gear (5) is sleeved on the extension shaft (102).

2. The starter motor reduction mechanism of claim 1, wherein The inner ring (1) is placed in a support structure (103), and the extension shaft (102) extends out of the support structure (103); The starting motor reduction mechanism further comprises an oil separation disc (2); The oil separation disc (2) is sleeved on the extension shaft (102) and fixed on the support structure (103) to isolate the extension shaft (102).

3. The starter motor reduction mechanism of claim 2, wherein The oil separation disc (2) is sleeved with an oil seal (4) and a retainer (3) inside; The taper surface (101) is provided with a weight reduction hole (1011).

4. The starter motor reduction mechanism of claim 3, wherein The extension shaft (102) is connected to an external structure (104); The external structure (104) and the first engagement gear (5) are provided with a combined retainer (6); The combined retainer (6) comprises a first half combined retainer (61) and a second half combined retainer (62); The first half combined retainer (61) and the second half combined retainer (62) embrace the extension shaft (102) and are connected and fixed by bolts (12).

5. The starter motor reduction mechanism of claim 4, wherein, The extension shaft (102) between the combined retainer (6) and the first engagement gear (5) is sleeved with a sleeved retainer (11).

6. The starter motor reduction mechanism of claim 5, wherein, The bearing (7) is a deep groove ball bearing.

7. The starter motor reduction mechanism of claim 6, wherein, The bearing (7) is two, and the bearing positioning sleeve (10) is arranged between them.

8. A method of assembling a reduction mechanism for a starter motor, characterized by, Based on the starting motor reduction mechanism according to any one of claims 1 to 7, the assembly method comprises: cooling the planet shaft (8); sleeving the cooled planet shaft (8) into the planet shaft sleeve (9), and realizing interference fit after temperature recovery.

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