Starting motor reducing mechanism and motor thereof

Abstract

The invention provides a starting motor reducing mechanism and an assembling method thereof. The starting motor reducing mechanism comprises a sun gear, a planet gear, an inner gear ring and a pinion. The planetary gear is meshed with the inner gear ring and the sun gear to form a planetary gear, the planetary gear and a planetary shaft of the planetary gear are in positioning, supporting and transmission through two bearings and one bearing, a planetary shaft sleeve is arranged between the planetary shaft and the bearings, the planetary shaft sleeve and the bearings are in transition or clearance fit, and the planetary shaft sleeve and the bearings are in transmission or clearance fit. And the planet shaft sleeve is in interference fit with the planet shaft. Structural support under the condition of high linear speed is provided through the planet wheel structure, the assembling and using requirements are met through the matching relation of the planet shaft sleeve structure and the bearings, and the technical problem of interference assembling under the condition that the assembling and using requirements are met and the bearings are arranged separately is solved.

Description

Technical field:

[0001] The invention relates to the technical field of marine diesel engine starting, in particular to a starting motor speed reduction mechanism and a motor thereof. Background technology:

[0002] At present, marine diesel engines with small and medium cylinder diameters are all started by starting motors. When starting marine diesel engines, the starting motor needs to output large torque, and the function of the reduction mechanism is to reduce the speed of the power input side and increase the torque, so as to ensure the smooth progress of the starting process. The reduction mechanism is usually composed of a first-stage planetary reduction and a second-stage parallel external gear reduction. The smooth and reliable operation of the reduction mechanism requires a reasonable gear support method, sufficient gear strength, good lubrication, and good axial limit of the transmission parts. However, the reduction part structure in the existing technology is difficult to cope with the sealing and strength requirements under high linear speeds.

[0003] Therefore, there is an urgent need for a starter motor deceleration mechanism and a motor thereof, which can help solve the technical problem of the lack of a deceleration structure at a large linear speed in the prior art. Summary of the invention:

[0004] In one embodiment, the present invention provides a starter motor deceleration mechanism, which provides structural support under high linear speed conditions through a planetary gear structure, and meets the structural strength requirements under high linear speeds through the matching relationship between the planetary sleeve and the bearing, which helps to solve the technical problem of the lack of a deceleration structure under high linear speeds in the prior art.

[0005] The starter motor speed reduction mechanism includes an internal gear ring, a sun gear, and planetary gears;

[0006] The planetary gears are respectively meshed with the inner gear ring and the sun gear to form planetary gears. The planetary gears and their planetary shafts are supported and driven by bearings. A planetary sleeve is arranged between the planetary shaft and the bearing. The planetary sleeve and the bearing have a transition or clearance fit, and the planetary sleeve and the planetary shaft have an interference fit.

[0007] In one embodiment, the inner ring of the inner gear has a meshing internal gear, the meshing gear meshes with the planetary gear, and one end of the inner gear is extended to form a first meshing gear;

[0008] The first meshing gear meshes with the second meshing gear.

[0009] In one embodiment, a transition cone surface in the middle of one end of the inner gear ring extends backward to form a protruding shaft, and the first meshing gear is sleeved on the protruding shaft.

[0010] In one embodiment, the inner gear ring is placed in a support structure, and the extension shaft extends out of the support structure;

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

[0012] The oil separator is sleeved outside the extending shaft and fixed on the supporting structure to isolate the extending shaft.

[0013] In one embodiment, the oil separator is sleeved with an oil seal and a retaining ring;

[0014] The conical surface is provided with a weight-reducing hole.

[0015] In one embodiment, the end of the extended 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 comprises 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 embrace the extended shaft and are fixed by bolt connection.

[0019] In one embodiment, a sleeve 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 arranged between them.

[0022] In one embodiment, the present invention provides an assembly method of a starter motor reduction mechanism. Based on the starter motor reduction mechanism as described above, the assembly method includes:

[0023] Cooling the planetary shaft;

[0024] The cooled planetary shaft is inserted into the planetary shaft sleeve to achieve interference fit after the temperature is restored. Description of the drawings:

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

[0026] Figure 2 In another embodiment of the present invention Figure 1 A local enlarged schematic diagram of D in FIG.

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

[0028] Reference numerals:

[0029] Internal gear ring 1

[0030] Cone 101

[0031] Weight reduction hole 1011

[0032] Extended shaft 102

[0033] Support structure 103

[0034] External structure 104

[0035] Grease trap 2

[0036] Retaining ring 3

[0037] Oil seal 4

[0038] First meshing gear 5

[0039] The second meshing gear 501

[0040] Combined retaining ring 6

[0041] The first half circle combined retaining ring 61

[0042] Second half circle combined retaining ring 62

[0043] Bearing 7

[0044] Planetary axis 8

[0045] Planetary sleeve 9

[0046] Bearing locating sleeve 10

[0047] Retaining ring 11

[0048] Bolt 12

[0049] Sun gear 13

[0050] Planetary gear 14 Specific embodiment:

[0051] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0052] 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 a preferred form of embodiment given as a non-limiting example with reference to the accompanying drawings.

[0054] It should also be understood that, although the present application has been described with reference to some specific examples, those skilled in the art will be able to realize many other equivalent forms of the present application that have the features described in the claims and are therefore within the scope of protection defined thereby.

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

[0056] Specific embodiments of the present application are described hereinafter with reference to the accompanying drawings; however, it should be understood that the embodiments applied for are merely examples of the present application, which may be implemented in a variety of ways. Well-known and / or repeated functions and structures are not described in detail to determine the true intent based on the user's historical operations and to avoid unnecessary or redundant details that make the present application unclear. Therefore, the specific structural and functional details applied for herein are not intended to be limiting, but are merely used as the basis and representative basis for the claims to teach those skilled in the art to use the present application in a variety of 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 the present application.

[0058] In order to achieve effective gear support, good lubrication conditions and reliable axial positioning at high speed, a structural scheme of the starter motor reduction mechanism is proposed.

[0059] The invention proposes a high-power, high-transmission ratio starter motor deceleration structure, which realizes the reliable speed reduction and torque increase function of the starter motor. The invention has high space utilization, compact structure and light weight, while taking into account the advantages of reliable support of planetary bearings (reliable installation of planetary shafts), effective sealing of oil seals, and a gear ring structure without abnormal wear of the journal, which greatly improves the operating reliability.

[0060] Figure 1 This is a schematic diagram of the structure of a starter motor deceleration mechanism in one embodiment of the present invention; Figure 2 In another embodiment of the present invention Figure 1 A local enlarged schematic diagram of D in FIG. Figure 3 In another embodiment of the present invention Figure 1 Schematic diagram of the S1-S1 cross-section structure. Figures 1 to 3 As shown, in one embodiment, the present invention provides a starter motor reduction mechanism, the starter motor reduction mechanism includes an internal gear ring 1, a sun gear 13, and a planetary gear 14;

[0061] The planetary gear 14 is meshed with the inner gear ring 1 and the sun gear 13 respectively to form the planetary gear 14. The planetary gear 14 and its planetary shaft 8 are supported and driven by bearings 7. A planetary sleeve 9 is arranged between the planetary shaft 8 and the bearing 7. The planetary sleeve 9 and the bearing 7 have a transition or clearance fit, and the planetary sleeve 9 and the planetary shaft 8 have an interference fit.

[0062] Working principle: driven by compressed air, the sun gear 13 rotates, and the sun gear 13 drives the planetary gears 14 and the inner ring gear 1 to rotate, the speed decreases and the torque increases; the inner ring gear is connected to the first meshing gear through a spline, and the first meshing gear drives the secondary reduction gear to rotate, further realizing the function of reducing speed and increasing torque.

[0063] In this embodiment, a specific structure of a starter motor reduction mechanism is provided, the key of which is that the outer side and the inner side of the planetary sleeve 9 have two different tolerance fits respectively, and the planetary shaft 8 can be cold assembled after the diameter is reduced at low temperature to finally achieve an interference fit. The main purpose is to prevent relative movement between the planetary sleeve 9 and the planetary shaft 8, and there is an axial clearance caused by the positioning sleeve between the two bearings, which can easily cause deflection and directly hit the inner ring of the other bearing, causing installation jamming and reducing the bearing life, so as to reduce damage when the linear speed is large, which helps to solve the technical problem of the lack of a reduction structure under high linear speed in the prior art.

[0064] In one embodiment, the inner ring of the inner gear ring 1 has a meshing internal gear, and the meshing gear is meshed with the planetary gear 14. One end of the inner gear ring 1 is extended to form a first meshing gear 5;

[0065] The first meshing gear 501 meshes with the second meshing gear 501 .

[0066] In one embodiment, the transition cone surface 101 in the middle of the one end of the inner gear ring 1 extends backward to form a protruding shaft 102 , and the first meshing gear 5 is sleeved on the protruding shaft 102 .

[0067] In one embodiment, the inner gear ring 1 is placed in the support structure 103, and the extension shaft 102 extends out of the support structure 103;

[0068] The starter motor speed reduction mechanism further includes an oil separator 2;

[0069] The oil separator 2 is sleeved on the outside of the extending shaft 102 and fixed on the supporting structure 103 to isolate the extending shaft 102 .

[0070] In one embodiment, the oil seal 4 and the retaining ring 3 are sleeved in the oil separator 2;

[0071] A weight-reducing hole 1011 is provided on the conical surface 101. The weight-reducing hole 1011 here can not only reduce the deadweight of the inner gear ring 1, but also can be penetrated by a tool to install the oil seal 4 and the retaining ring 3 in the oil separator 2.

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

[0073] A combined retaining ring 6 is provided between the external structure 104 and the first meshing gear 5;

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

[0075] The first half circle combined retaining ring 61 and the second half circle combined retaining ring 62 embrace the extended shaft 102 and are connected and fixed by bolts 12 .

[0076] In this embodiment, it can be installed in a smaller case.

[0077] In one embodiment, a sleeve retaining ring 11 is sleeved on the extended shaft 102 between the combined retaining ring 6 and the first meshing gear 5. The sleeve retaining rings 11 in this embodiment are two retaining rings with small dynamic imbalance and anti-loosening installed oppositely.

[0078] In one embodiment, the bearings 7 are deep groove ball bearings, and there are two of them.

[0079] In one embodiment, there are two bearings 7, and a bearing positioning sleeve 10 is disposed between them.

[0080] The overall structure is compact, the space utilization rate is high, and the structural sealing is reliable even at high line speed.

[0081] In one embodiment, the present invention further provides an assembly method of a starter motor reduction mechanism. Based on the starter motor reduction mechanism, the assembly method includes:

[0082] Cooling the planetary shaft 8;

[0083] The cooled planetary shaft 8 is inserted into the planetary shaft sleeve 9, and an interference fit is achieved after the temperature returns to normal temperature.

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

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

[0086] Isolation disc and gear ring weight reduction holes, as well as disassembly and assembly structure.

[0087] Double rolling bearings and retaining rings.

[0088] The planetary shaft has a double-layer structure, which is easy to assemble.

[0089] Combined dynamic balancing retaining ring.

[0090] In order to reduce the linear speed of the oil seal 4 and avoid the problems of wear, heating and seal failure caused by excessive linear speed; reduce the diameter of the inner gear ring 1, and the outer diameter of the oil seal matches the inner diameter of the oil separator 2. The oil separator is fixed to the reducer housing through the weight-reducing hole on the inner gear ring. The retaining ring 3 is installed in the groove opened on the oil separator to limit the axial displacement of the oil seal.

[0091] The axial position of the first meshing gear 5 is constrained by a combined retaining ring 6, and the retaining rings are connected by two retaining rings 11 and screws 12. The retaining ring is positioned by fitting with the boss processed on the inner gear ring. The two screws are installed opposite to each other 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 is difficult to provide sufficient support, and the use of larger bearings will increase the size). The bearing positioning sleeve 10 is used between the two bearings to provide better axial positioning, while also ensuring good lubrication between the bearings under high-speed operation. To facilitate installation, this patent adopts a planetary sleeve 9 to achieve the installation of the planetary shaft to provide reliable support for the bearing: the outer diameter of the planetary sleeve and the inner diameter of the planetary carrier are transitional or clearance fit (sufficient clearance can be achieved in the cold installation state); the inner diameter of the planetary sleeve and the outer diameter of the planetary shaft are interference fit (small clearance in the cold installation state of the planetary shaft). The outer and inner rings of the planetary sleeve have long guide sections, and since there is sufficient clearance in the cold installation state, the planetary sleeve can be installed without jamming. After the planetary sleeve returns to normal temperature, the planetary shaft can be cold-installed and knocked in. Due to temperature changes, the planetary shaft will expand the thin-walled planetary sleeve and achieve the purpose of interference fit with the planetary carrier.

[0093] The high-speed planetary gear system gears are splash lubricated with lubricating oil due to their high rotation speed; the secondary reduction gears are grease lubricated. How to form a reliable sealing and lubrication environment plays an important role in the stable operation of the starter motor. The inner ring gear has a high rotation speed and a large size. In order to reduce the linear speed of the shaft seal, the present invention is designed with an oil separator. The oil separator is fixed to the outer shell through the mounting bolts through the weight reduction holes on the inner ring gear. The outer ring of the oil seal cooperates with the inner diameter of the oil separator, and the inner ring of the oil seal cooperates with the inner ring gear to reduce the diameter of the inner ring gear and the shaft neck, thereby reducing the maximum operating linear speed of the oil seal. Compared with the prior art, the beneficial effects of the oil seal design provided by the embodiment of the present invention are: the arrangement is novel, and the oil seal is installed by utilizing the weight reduction holes of the ring gear. Not only is the disassembly and maintenance easier, but the oil seal specifications can also be reduced, the linear speed can be reduced, the abnormal wear of the shaft neck can be reduced, and the oil seal function failure can be avoided, thereby improving the operating reliability.

[0094] In the axial fixing method of the first meshing gear, the integral annular retaining ring was mostly used in the past. This connection structure is not convenient to disassemble, which increases the difficulty of use and reduces practicality. The annular retaining ring generally realizes the axial positioning function through the friction between the annular retaining ring and the shaft neck, and the axial clearance is large. During use, the shaft neck may be abnormally worn, expanded or even detached due to the axial movement and circumferential rotation of the retaining ring, resulting in structural failure. The retaining ring adopted by the present invention is a combined retaining ring. The retaining ring relies on the plane fit processed on the inner gear ring to achieve circumferential positioning. The retaining ring 1 and the retaining ring 2 are tightened by two screws to fasten the retaining ring to the shaft. The two bolts are installed oppositely to make the retaining ring in a completely balanced state. Compared with the prior art, the beneficial effects of the retaining ring structure provided by the embodiment of the present invention are: 1. The retaining ring has no axial movement or circumferential rotation relative to the shaft, which effectively reduces the wear of the shaft neck; 2. Reduce the imbalance caused by the non-closure and uneven thickness of the conventional retaining ring under high-speed rotation; 3. Reduce the risk of the retaining ring detaching under high-speed rotation by tightening the bolts.

[0095] In terms of the support method of the planetary gear, in order to improve the operational reliability, each planetary gear is supported by two deep groove ball bearings with good high speed (a single deep groove ball bearing is difficult to provide sufficient support capacity, that is, the strength check fails; but if a larger specification bearing is used, the size will increase), and a bearing positioning sleeve is used between the two bearings to achieve axial positioning, while also ensuring good lubrication between the bearings under high-speed operation. If the support shaft is cold-mounted according to the conventional method to support the planetary gear bearing, since its outer diameter needs to be an interference fit with the inner hole of the planetary carrier to prevent circumferential rotation, and there is an axial gap caused by the positioning sleeve between the two bearings, it is easy to form a deflection and directly knock on the inner ring of the other bearing, causing installation jamming and reducing the bearing life. This patent adopts the method of installing the planetary shaft inside the planetary sleeve, and indirectly realizes the interference fit between the planetary shaft and the planetary carrier by relying on the deformation of the parts with temperature. Compared with the prior art, the beneficial effect of the bearing support method provided by the embodiment of the present invention is that the difficulty of assembly is greatly reduced, and the risk of damage to the parts and reduced life caused by knocking on the inner ring of the bearing is prevented.

[0096] In order to achieve effective gear support, good lubrication conditions and reliable axial positioning at high speed, a structural scheme of the starter motor reduction mechanism is proposed.

[0097] The power input drives the sun gear, planetary gear, and inner gear ring (collectively referred to as the planetary assembly) to rotate. The lubricating oil seal of the planetary assembly is sealed by the oil seal installed on the inner gear ring shaft neck. The outer diameter of the oil seal is limited by the oil separator, and the retaining ring is installed in the groove opened on the oil separator to limit the axial displacement of the oil seal; the secondary reduction pinion is connected to the inner gear ring through a spline. In order to prevent wear at the small diameter shoulder of the combined retaining ring and the inner gear ring, the combined retaining ring is used to turn the positioning surface into a boss of the inner gear ring. The two retaining rings are tightened symmetrically with two screws. The maximum axial displacement of the secondary reduction pinion is limited by the groove where the combined retaining ring is installed on the inner gear ring. Considering the design reliability and assembly feasibility, when installing the planetary gear, due to the support method of double deep groove ball bearings and positioning sleeves, the planetary shaft is installed in steps: 1. Cold installation of the planetary shaft sleeve (transition or clearance fit between the outer ring of the planetary shaft sleeve and the inner hole of the planetary carrier); 2. After the planetary shaft sleeve returns to normal temperature, the planetary shaft is cold installed (interference fit between the outer ring of the planetary shaft and the inner hole of the planetary shaft sleeve). After the planetary shaft returns to normal temperature, the thin-walled planetary sleeve can be expanded to achieve the purpose of interference fit between the planetary shaft and the planetary sleeve, and between the planetary sleeve and the planetary carrier, thereby achieving effective support for the bearing.

[0098] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

Claims

1. A starter motor speed reduction mechanism, characterized in that: The starter motor speed reduction mechanism comprises: an inner gear ring (1); a sun gear (13); A planetary gear (14) is meshed with the inner gear ring (1) and the sun gear (13) to form a planetary gear (14); a bearing (7) is used to support the transmission between the planetary gear (14) and its planetary shaft (8); a planetary shaft sleeve (9) is arranged between the planetary shaft (8) and the bearing (7); a transition or clearance fit is formed between the planetary shaft sleeve (9) and the bearing (7); and an interference fit is formed between the planetary shaft sleeve (9) and the planetary shaft (8).

2. The starter motor speed reduction mechanism according to claim 1, characterized in that: The inner ring of the inner gear ring (1) has a meshing internal gear, the meshing gear meshes with the planetary gear (14), and a first meshing gear (5) is arranged after one end of the inner gear ring (1) extends out; The first meshing gear (5) meshes with the second meshing gear (501).

3. The starter motor speed reduction mechanism according to claim 2, characterized in that: A transition cone surface (101) in the middle of one end of the inner gear ring (1) extends backward to form a protruding shaft (102), and the first meshing gear (5) is sleeved on the protruding shaft (102).

4. The starter motor speed reduction mechanism according to claim 3, characterized in that: The inner gear ring (1) is placed in a support structure (103), and the extension shaft (102) extends out of the support structure (103); The starter motor speed reduction mechanism also includes an oil separator (2); The oil separator (2) is sleeved outside the protruding shaft (102) and fixed on the supporting structure (103) to isolate the protruding shaft (102).

5. The starter motor speed reduction mechanism according to claim 4, characterized in that: The oil separator (2) is internally sleeved with an oil seal (4) and a retaining ring (3); The conical surface (101) is provided with a weight-reducing hole (1011).

6. The starter motor speed reduction mechanism according to claim 5, characterized in that: The end of the extended shaft (102) is connected to an external structure (104); A combined retaining ring (6) is provided between the external structure (104) and the first meshing gear (5); The combined retaining ring (6) comprises a first half-circle combined retaining ring (61) and a second half-circle combined retaining ring (62); The first half circle combined retaining ring (61) and the second half circle combined retaining ring (62) surround the extended shaft (102) and are connected and fixed by bolts (12).

7. The starter motor speed reduction mechanism according to claim 6, characterized in that: A sleeve-type retaining ring (11) is sleeved on the protruding shaft (102) between the combined retaining ring (6) and the first meshing gear (5).

8. The starter motor speed reduction mechanism according to claim 7, characterized in that: The bearing (7) is a deep groove ball bearing.

9. The starter motor speed reduction mechanism according to claim 8, characterized in that: There are two bearings (7), and a bearing positioning sleeve (10) is arranged between them.

10. A method for assembling a starter motor reduction mechanism, characterized in that: Based on the starter motor reduction mechanism according to any one of claims 1 to 9, the assembly method comprises: Cooling the planetary shaft (8); The cooled planetary shaft (8) is inserted into the planetary shaft sleeve (9) to achieve interference fit after the temperature is restored.

Images