CN202901217U - Gear of large-power marine gearbox - Google Patents
Gear of large-power marine gearbox Download PDFInfo
- Publication number
- CN202901217U CN202901217U CN 201220504807 CN201220504807U CN202901217U CN 202901217 U CN202901217 U CN 202901217U CN 201220504807 CN201220504807 CN 201220504807 CN 201220504807 U CN201220504807 U CN 201220504807U CN 202901217 U CN202901217 U CN 202901217U
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- Prior art keywords
- gear
- arc
- tooth
- segment
- marine gearbox
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Abstract
The utility model relates to gear, and particularly to a gear in a large-power marine gearbox. The gear of the large-power marine gearbox comprises a gear body. Teeth are uniformly arranged on the outer circumferential surface of the gear body. The connection parts between tooth roots of the teeth and the gear body are respectively provided with an arc connection segment. The connection part between each arc connection segment and the tooth root is provided with an arc transition segment. The diameter of the arc transition segment is smaller than the diameter of the arc connection segment. The arc transition segment and the arc connection segment respectively dent inwards. The gear of the large-power marine gearbox provided by the utility model has the following advantages: capability of effectively eliminating stress concentration in thermal treatment, improved tensile strength of the tooth core part of the gear, small noise and long service life. The gear of the large-power marine gearbox settles the following technical problems in the prior-art marine gear: low toughness, easy tooth root breakage and large noise.
Description
Technical field
The utility model relates to gear, relates in particular to the gear in a kind of powerful marine gearbox.
Background technique
It is very wide that gear is used in present machinery and technique, and gear is divided into cylindrical gears, bevel gear, noncircular gear, tooth bar, worm and worm gear by its profile; Be divided into spur gear, helical gear, herringbone gear, curved tooth cylindrical gear by the tooth trace shape; Surface by gear teeth place is divided into external gear, internal gear; Can be divided into cast gear, cutting gear, rolling gear, sintered gear(s) etc. by manufacture method.In existing patent document, about the patent document of gear Chinese patent is arranged: " a kind of high-power arc umbrella gear (CN102364164A) " comprises arc umbrella gear and splined shaft, the modulus Mn=25 of described arc umbrella gear.It follows these steps to carry out: design-selection-forging-blank heat treatment-roughing-fine finishing-mill teeth-polishing-carburizing and quenching-roll flute-detection.The gear of gear box for high-power ship is generally helical gear, and its tooth root section easily ruptures.
Summary of the invention
The utility model provides a kind of stress can effectively eliminate heat treatment the time to concentrate, and improves the tooth heart section tensile strength of gear, and noise is little, the gear box for high-power ship gear of long service life; The toughness that has solved the marine gear that exists in the prior art is bad, and tooth root easily ruptures, the technical problem that noise is large.
Above-mentioned technical problem of the present utility model solves by following technical proposals: a kind of gear box for high-power ship gear, comprise gear body, external peripheral surface in gear body is evenly equipped with tooth, tooth root and gear body joint at tooth respectively are provided with an arc linkage section, be provided with the arc-shaped transition section in the joint of arc linkage section and tooth root, the diameter of arc-shaped transition section is less than arc linkage section diameter, and arc-shaped transition section and arc linkage section all concave.Concaving is the direction depression of pointing to tooth, namely is less than the width at tooth root place at the width of the tooth at arc-shaped transition section and arc linkage section place.Formed an arc-shaped transition section by fine finishing, the ess-strain when having reduced the heat treatment of tooth root section, not easy tooth-breaking.Gear is by normalizing, and carburizing is roughly ground tooth and finishing grinding tooth after the operations such as secondary high-temperature oil processing again, improves the toughness of gear, has also improved the tooth face hardness of gear and the tensile strength of tooth heart section simultaneously.Simultaneously to the tooth of gear through tooth top tip relief and teeth directional tip relief, eliminated the excessive and noise that produces of flank of tooth contact ratio that the reasons such as large width teeth directional invar and accuracy of manufacturing cause thereby reduced gear in the fashionable moment percussion of rotary cutting.
As preferably, the radius R of described arc-shaped transition section is 0.08 ~ 0.12mm.The radius of arc-shaped transition section is selected according to precision and the processing request of gear.
As preferably, the radius R of arc linkage section is 1.2 ~ 1.4mm.
As preferably, described gear adopts the manufacturing of 20CrMnTi material.Have higher intensity and toughness, particularly have higher low-temperature impact toughness.And the through hardening performance is good, has hard and wear-resisting surface and tough and tensile heart section behind carburizing and quenching, has higher low-temperature impact toughness, and weldability is medium, and machinability is good after the normalizing.
Therefore, gear box for high-power ship gear of the present utility model possesses following advantage: tooth root section is carried out accurate gear hobbing processing, so that tooth root section forms good geometrical shape and surface accuracy, ess-strain when reducing heat treatment improves the tooth face hardness of gear and the tensile strength of tooth heart section; Simultaneously, the gear ring Runout tolerance from 0.036 permitted value bring up to≤0.031; Gear is carried out tip relief, eliminated the excessive and noise that produces of flank of tooth contact ratio that the reasons such as large width teeth directional invar and accuracy of manufacturing cause thereby reduced gear in rotary cutting fashionable moment percussion.
Description of drawings
Fig. 1 is the schematic diagram of gear box for high-power ship gear of the present utility model.
Fig. 2 is the enlarged diagram at A place in Fig. 1.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, the technological scheme of model utility is described in further detail.
Embodiment:
As illustrated in fig. 1 and 2, the gear box for high-power ship gear, gear adopts 20GrMnTi to make, comprise gear body 2, be processed with uniform helical teeth 1 in gear body 2, be connected by arc linkage section 3 between the tooth root section 5 of helical teeth 1 and the gear body, the radius R 2 of arc linkage section 3 is 1.3mm, being connected with tooth root section at arc linkage section 3 also is to connect by an arc-shaped transition section 4, and the radius R 1 of arc-shaped transition section 4 is 0.1mm, stays the mill hobboing cutter to process arc-shaped transition section 4 by plush copper.Arc-shaped transition section 4 and arc linkage section 3 all are the direction depressions to helical teeth 1, tooth root section 5 are namely arranged to arc-shaped transition section 4, arc linkage section 3, and the width of tooth is more and more less.
When making gear, get 20GrMnTi as raw material, forge, the thickness of the workpiece after forging is 5cm, and the workpiece after then will forging is heated to 420 ℃, is incubated 5 hours and cools off with stove.Then machine, in the centre-drilling hole of workpiece, carry out gear hobbing at the external peripheral surface of workpiece, in center hole, process spline.Workpiece shape roughly after machining finishes is finished, then carry out Carburization Treatment, with Work piece sealing in carbon dust, be warming up to 700 ~ 850 ℃ under negative pressure 800 handkerchief conditions, carburized layer thickness guarantees at 1.2 ~ 1.8mm, is incubated 2-3 hour, diffusion is 15 minutes after the blow-on, the adding temperature is 25 ℃ normal temperature oil, and Cooling Quenching keeps doing in 2-3 hour the processing that eliminates stress in 200 ℃ of temperature after the cooling.Carry out the secondary high-temperature oil processing after the Cooling Quenching, part is placed in 280 ~ 380 ℃ the high temperature oil and immersed 2 hours, to eliminate the residual stress in the carburizing process.Then the laggard parallel planes mill of secondary high-temperature oil processing, mill endoporus roughly grind tooth, carry out accuracy detection behind the corase grind tooth, then on High Precision Automatic gear grinding machine gear surface are carried out finishing grinding tooth again, then carry out profile of tooth and teeth directional tip relief, and then inspection oils eventually.
Claims (4)
1. gear box for high-power ship gear, it is characterized in that: comprise gear body, external peripheral surface in gear body is evenly equipped with tooth, tooth root and gear body joint at tooth respectively are provided with an arc linkage section, be provided with the arc-shaped transition section in the joint of arc linkage section and tooth root, the diameter of arc-shaped transition section is less than arc linkage section diameter, and arc-shaped transition section and arc linkage section all concave.
2. gear box for high-power ship gear according to claim 1, it is characterized in that: the radius R 1 of described arc-shaped transition section is 0.08 ~ 0.12mm.
3. gear box for high-power ship gear according to claim 1 and 2, it is characterized in that: the radius R 2 of arc linkage section is 1.2 ~ 1.4mm.
4. gear box for high-power ship gear according to claim 1 and 2 is characterized in that: the manufacturing of described gear employing 20CrMnTi material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220504807 CN202901217U (en) | 2012-09-29 | 2012-09-29 | Gear of large-power marine gearbox |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220504807 CN202901217U (en) | 2012-09-29 | 2012-09-29 | Gear of large-power marine gearbox |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202901217U true CN202901217U (en) | 2013-04-24 |
Family
ID=48121889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220504807 Expired - Fee Related CN202901217U (en) | 2012-09-29 | 2012-09-29 | Gear of large-power marine gearbox |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202901217U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111571156A (en) * | 2020-05-29 | 2020-08-25 | 全椒县众联机械有限公司 | Cylindrical gear machining method with high impact resistance |
-
2012
- 2012-09-29 CN CN 201220504807 patent/CN202901217U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111571156A (en) * | 2020-05-29 | 2020-08-25 | 全椒县众联机械有限公司 | Cylindrical gear machining method with high impact resistance |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130424 Termination date: 20170929 |