US20050230008A1 - Plate-shaped element of belt for belt type continuously variable transmission - Google Patents

Plate-shaped element of belt for belt type continuously variable transmission Download PDF

Info

Publication number
US20050230008A1
US20050230008A1 US11/086,409 US8640905A US2005230008A1 US 20050230008 A1 US20050230008 A1 US 20050230008A1 US 8640905 A US8640905 A US 8640905A US 2005230008 A1 US2005230008 A1 US 2005230008A1
Authority
US
United States
Prior art keywords
plate
shaped element
weight
belt
steel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US11/086,409
Other languages
English (en)
Inventor
Gou Katou
Makoto Yoshida
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JATCO Ltd
Original Assignee
JATCO Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by JATCO Ltd filed Critical JATCO Ltd
Assigned to JATCO LTD reassignment JATCO LTD ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KATOU, GOU, YOSHIDA, MAKOTO
Publication of US20050230008A1 publication Critical patent/US20050230008A1/en
Abandoned legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese

Definitions

  • This invention relates to improvements in plate-shaped elements of a belt connecting a primary pulley and a secondary pulley in a belt type continuously variable transmission, and more particularly to a composition of steel of the plate-shaped element as a component part of the belt.
  • a belt continuously variable transmission includes drive and driven pulleys which are separate from and drivingly connected with each other by a belt.
  • the belt is constituted of a plurality of plate-shaped elements or blocks which are arranged in a ring form by being supported On band-shaped steel rings so that an engine torque is transmitted to a drive shaft under friction between a tapered surface or sheave surface of a frustoconical disc of the drive and driven pulleys and a contact surface or flank surface of the plate-shaped element. Therefore, the flank surface of plate-shaped element is required to have a high wear resistance, so that a special steel such as a high carbon steel is used as a material for the plate-shaped element. After the special steel is formed into a certain shape, for example, by blanking, it is subjected to a heat treatment such as quenching or tempering, thereby producing the plate-shaped element having a high hardness which provides a wear resistance.
  • the inventors of the present invention produced plate-shaped elements on an experimental basis and carried out impact and fatigue tests, on the basis of the knowledge according to the above conventional techniques.
  • the area percentage and shape of carbide is in the range of the above-described knowledge (within the range in which impact and fatigue properties can be improved)
  • some plate-shaped elements exhibited remarkably low impact and fatigue strengths, and it seems that sufficient improvement is not achieved by the above-discussed conventional techniques.
  • an object of the present invention to provide an improved plate-shaped element of a belt for a belt type continuously variable transmission, which can effectively overcome drawbacks encountered in conventional plate-shaped elements of the similar nature.
  • Another object of the present invention is to provide an plate-shaped element of a belt for a belt type continuously variable transmission, which is provided with such composition and characteristics as to obtain high part strengths (fatigue and impact strengths).
  • a plate-shaped element of a belt for a belt type continuously variable transmission is formed of a steel which comprises at least one of martensite structure and tempered martensite structure, containing a solid-solution carbon in an amount ranging from 0.4 to 0.7% by weight.
  • the steel has a surface hardness ranging from 55 to 65 in Rockwell hardness C-scale.
  • FIG. 1 is a front view of an embodiment of a plate-shaped element of a belt for a belt type continuously variable transmission, according to the present invention
  • FIG. 2A is a schematic front view showing a manner of an Izod impact test for the plate-shaped element of FIG. 1 ;
  • FIG. 2B is a schematic side view showing the manner of the Izod impact test of FIG. 2A ;
  • FIG. 3A is a schematic front view showing a manner of a bending fatigue (fracture) test for the plate-shaped element of FIG. 1 ;
  • FIG. 3B is a schematic side view showing the manner of the bending fatigue test of FIG. 1 ;
  • FIG. 4 is a graph showing the relationship between the content of a solid-solution carbon in martensite structure and/or tempered martensite structure and the result (absorbed energy) of the impact test;
  • FIG. 5 is a graph showing the relationship between the content of the solid-solution carbon in martensite structure and/or tempered martensite structure and the result (fatigue life) of the fatigue test;
  • FIG. 6 is a graph showing the relationship between the content of an impurity element (P) and the result (absorbed energy) of the impact test;
  • FIG. 7 is a graph showing the relationship between the content of the impurity element (P) and the result (fatigue life) of the fatigue test;
  • FIG. 8 is a graph showing the relationship between the content of an impurity element (S) and the result (absorbed energy) of the impact test;
  • FIG. 9 is a graph showing the relationship between the content of the impurity element (S) and the result (fatigue life) of the fatigue test;
  • FIG. 10 is a graph showing the relationship between the average grain size of a prior austenite and the result (absorbed energy) of the impact test;
  • FIG. 11 is a graph showing the relationship between the content of Ni and/or Mo and the result (absorbed energy) of the impact test.
  • FIG. 12 is a graph showing the relationship between the content of Ni and/or Mo and the result (fatigue life) of the fatigue test.
  • FIG. 1 of the drawings an embodiment of a plate-shaped element (or block) of a belt for a belt type continuously variable transmission is illustrated.
  • a plurality of plate-shaped elements are aligned with and secured to band-shaped rings (not shown) to form a the belt through which drive and driven pulleys of the belt type continuously variable transmission is connected though not shown.
  • the plate-shaped element includes a body 1 which laterally extends and formed at its opposite ends (side surfaces) with flank surfaces 2 .
  • the flank surfaces 2 are opposite to each other and contactable with the sheave surfaces of one of the pulleys.
  • a neck 4 is integral with and extends vertically from the body 1 at the central portion to connect the body 1 to a head 5 .
  • the head 5 has ears 5 a which extend in opposite directions to each other and parallel with the body 1 .
  • the band-shaped ring is kept between the ear 5 a and the saddle surface 3 of the body 1 .
  • a nose 6 is formed at the central portion of the head 5 and extends perpendicular to the surface of the head 5 for the purpose of positioning of the plate-shaped element relative to adjacent plate-shaped elements.
  • the plate-shaped element is formed of a steel comprising at least one of martensite structure and tempered martensite structure, containing a solid-solution carbon in an amount ranging from 0.4 to 0.7% by weight.
  • the steel has a surface hardness ranging from 55 to 65 in Rockwell hardness C-scale.
  • FIGS. 2A and 2B are schematic illustrations showing a manner of the Izod impact test.
  • the plate-shaped element (sample) was fixed in a sample support S in such a manner that the body 1 was hidden in the support S, in which an absorbed energy was measured upon breaking the neck 4 with impact of a hammer.
  • FIGS. 3A and 3B are schematic illustrations showing the bending fatigue test.
  • a load was applied to a central position of the body 1 of the plate-shaped element which position was near the neck 4 of the plate-shaped element, and simultaneously loads in the opposite direction were applied to opposite end positions of the body 1 .
  • Such application of loads was repeated until the plate-shaped element was broken so as to make a bending fatigue fracture.
  • the number of cycles of the application of the loads at the bending fatigue fracture was measured to represent a fatigue life.
  • FIG. 4 is a graph showing the relationship between the content (% by weight) of the solid-solution carbon of martensite structure and/or tempered martensite structure and the result or absorbed energy (J) of the impact test.
  • the absorbed energy was an average value of seven measured values of the same sample.
  • FIG. 5 is a graph showing the relationship between the content of the solid-solution carbon of martensite structure and/or tempered martensite structure and the result or so-called B50 fatigue life (the number of cycles) of the bending fatigue test in which a stress ratio was constant while the samples had a surface hardness (in Rockwell hardness C-scale) ranging from 60 to 61.
  • the fatigue life was an average value of seven measured values of the same sample.
  • FIG. 6 is a graph showing the relationship between the content (% by weight) of P, which is an impurity element, and the result or impact energy (J) of the impact test.
  • the absorbed energy was an average value of six measured values of the same sample.
  • FIG. 7 is a graph showing the relationship between the content of P, which is an impurity element, and the result or so-called B50 fatigue life of the bending fatigue test in which a stress ratio was constant while the samples had a surface hardness (in Rockwell hardness C-scale) ranging from 60 to 61.
  • the fatigue life was an average value of six measured values of the same sample.
  • the upper limit of P content is set at 0.03% by weight. Since P content is preferably as small as possible, the lower limit is not set especially
  • FIG. 8 is a graph showing the relationship between the content of S, which is an impurity element, and the result or absorbed energy of the impact test.
  • the impact energy was an average value of six measured values of the same sample.
  • FIG. 9 is a graph showing the relationship between the content of S, which is an impurity element, and the result or so-called B50 fatigue life (the number of cycles) of the bending fatigue test in which a stress ratio was constant while the samples had the surface hardness (in Rockwell hardness C-scale) ranging from 60 to 61.
  • the fatigue life was an average value of six measured values of the same sample.
  • the upper limit of S content was set at 0.01% by weight. Since P content is preferably as small as possible, the lower limit is not set especially.
  • FIG. 10 is a graph showing the result or absorbed energy (J) of the impact test in case that the quenching temperature of the sample steel having the following composition was changed so that the austenite grain size at high temperatures at the time of heat treatment was changed:
  • the sample steels were same in surface hardness and generally same in composition, in which the absorbed energy was an average value of six measured values of the same sample.
  • the average grain size of so-called prior austenite is preferably 20 ⁇ m or smaller.
  • FIG. 10 shows the test result or absorbed energy (J) for only one of the sample steels, the above-described tendency is recognized on other sample steels in the same way. Therefore, even when any composition is selected, the average grain size of the prior austenite is preferably 20 ⁇ m or smaller.
  • FIG. 11 shows the relationship between the contents or added amounts of Ni and/or Mo and the result or absorbed energy (J) of the impact test.
  • the absorbed energy was an average value of six measured values of the same sample.
  • FIG. 12 shows the relationship between the contents or added amounts of Ni and/or Mo and the result or so-called B50 fatigue life (the number of cycles) of the bending fatigue test.
  • the fatigue life was an average value of six measured values of the same sample.
  • Ni and/or Mo are elements that are effective in enhancing the quenching properties, so that in order to secure the quenching properties, the lower limit of content of each of Ni and Mo were set at 0.3% by weight.
  • the upper limit of Ni content was set at 2% by weight, and that of Mo content was set at 1% by weight.
  • a carbide grain size is preferably 10 ⁇ m or smaller. If the grain size exceeds 10 ⁇ m, the start point of fatigue fracture may be formed.
  • Ti or Nb is preferably added in the range of 0.03 to 0.2% by weight. If either Ti or Nb is added, an effect of preventing the austenite grains from coarsening is obtained. However, even if the content of Ti or Nb exceeds 0.2% by weight, the effect does not so increase, so that the upper limit of addition of Ti or Nb was set at 0.2% by weight.
  • the impact properties and fatigue properties of the plate-shaped element depended mainly on the content of carbon forming a solid solution in martensite or tempered martensite and the content of impurity elements such as P and S, in which these properties were improved with a decrease in the contents.
  • the impact value depended on the grain size of austenite structure, which is a structure at the time of quenching heating, in which the impact properties were improved as the grains of the austenite structure become fine.
  • the properties were further improved by the addition of alloy elements such as Ni, Mo, Ti, Nb, etc.
  • the properties were improved by making carbide grains fine.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
US11/086,409 2004-03-31 2005-03-23 Plate-shaped element of belt for belt type continuously variable transmission Abandoned US20050230008A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2004106697A JP2005291350A (ja) 2004-03-31 2004-03-31 ベルト式無段変速機用板状エレメント
JP2004-106697 2004-03-31

Publications (1)

Publication Number Publication Date
US20050230008A1 true US20050230008A1 (en) 2005-10-20

Family

ID=35062408

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/086,409 Abandoned US20050230008A1 (en) 2004-03-31 2005-03-23 Plate-shaped element of belt for belt type continuously variable transmission

Country Status (4)

Country Link
US (1) US20050230008A1 (ja)
JP (1) JP2005291350A (ja)
DE (1) DE102005013538A1 (ja)
NL (1) NL1028609C2 (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101792885A (zh) * 2010-03-30 2010-08-04 莱芜钢铁集团有限公司 一种高碳锰铬磨球用热轧圆钢及其制造方法
KR20180095540A (ko) * 2015-12-21 2018-08-27 아르셀러미탈 연성 및 성형성이 개선된 고강도 강 시트를 제조하기 위한 방법, 및 얻어진 강 시트

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2370708B1 (en) * 2008-11-28 2013-01-09 Robert Bosch GmbH Method for manufacturing a drive belt, a drive belt and a method for operating a continuously variable transmission incorporating such a drive belt
NL1037185C2 (en) * 2009-08-10 2011-02-14 Bosch Gmbh Robert Transverse element for a drive belt, drive belt and method for manufacturing such a transverse element.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3663314A (en) * 1970-10-14 1972-05-16 Kaizo Monma Bearing steel composition
US6348109B1 (en) * 1998-03-23 2002-02-19 Uddeholm Tooling Aktiebolag Steel material and method for its manufacturing
US6562153B1 (en) * 1999-10-04 2003-05-13 Hitachi Metals, Ltd. Strain-induced type martensitic steel having high hardness and having high fatigue strength
US6739995B2 (en) * 2001-02-16 2004-05-25 Honda Giken Kogyo Kabushiki Kaisha Pushing block for CVT belt and manufacturing method therefor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3663314A (en) * 1970-10-14 1972-05-16 Kaizo Monma Bearing steel composition
US6348109B1 (en) * 1998-03-23 2002-02-19 Uddeholm Tooling Aktiebolag Steel material and method for its manufacturing
US6562153B1 (en) * 1999-10-04 2003-05-13 Hitachi Metals, Ltd. Strain-induced type martensitic steel having high hardness and having high fatigue strength
US6739995B2 (en) * 2001-02-16 2004-05-25 Honda Giken Kogyo Kabushiki Kaisha Pushing block for CVT belt and manufacturing method therefor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101792885A (zh) * 2010-03-30 2010-08-04 莱芜钢铁集团有限公司 一种高碳锰铬磨球用热轧圆钢及其制造方法
KR20180095540A (ko) * 2015-12-21 2018-08-27 아르셀러미탈 연성 및 성형성이 개선된 고강도 강 시트를 제조하기 위한 방법, 및 얻어진 강 시트
KR102618088B1 (ko) * 2015-12-21 2023-12-26 아르셀러미탈 연성 및 성형성이 개선된 고강도 강 시트를 제조하기 위한 방법, 및 얻어진 강 시트
US12054799B2 (en) * 2015-12-21 2024-08-06 Arcelormittal Method for producing a high strength steel sheet having improved ductility and formability, and obtained steel sheet

Also Published As

Publication number Publication date
NL1028609C2 (nl) 2005-12-28
JP2005291350A (ja) 2005-10-20
NL1028609A1 (nl) 2005-10-03
DE102005013538A1 (de) 2005-10-27

Similar Documents

Publication Publication Date Title
KR101671133B1 (ko) 표면 경화강 및 침탄재
US9051634B2 (en) Steel sheet
JP2007302950A (ja) 耐へたり性に優れた高強度ばね用鋼線
JP2003027181A (ja) 高靭性耐摩耗用鋼
CA2667291A1 (en) Forging steel
WO2009119388A1 (ja) 内燃機関用ピストンリング材
CA2405278C (en) Hot-working steel article
EP2011892A1 (en) Piston ring material for internal combustion engine
US6053991A (en) Production of cold working tool steel
EP1048744A1 (en) Bearing steel excellent in rolling fatigue life
JPS59179762A (ja) 冷間ダイス鋼
US20050230008A1 (en) Plate-shaped element of belt for belt type continuously variable transmission
JP3565960B2 (ja) 軸受用鋼、軸受および転がり軸受
JP4925971B2 (ja) 高張力鋼板用タッピンねじ類の製造方法
JP3535112B2 (ja) 耐溶損性・高温強度に優れた熱間工具鋼および該熱間工具鋼からなる高温用部材
JP4291941B2 (ja) 曲げ疲労強度に優れた軟窒化用鋼
JP2002155344A (ja) 高強度ねじ用鋼および高強度ねじ
JP4347763B2 (ja) 高温浸炭用鋼およびその製造方法
JP5707938B2 (ja) 冷間加工性に優れる肌焼鋼および高疲労強度浸炭材
RU2430186C2 (ru) Теплостойкая сталь
JP2650225B2 (ja) ばね用鋼
JP2004277838A (ja) 非調質鋼
JPH05148581A (ja) 高強度ばね用鋼および高強度ばねの製造方法
KR20080056945A (ko) 접촉피로강도가 우수한 침탄용 초고강도강
JP4515347B2 (ja) ばね用鋼線材およびばね用鋼線の耐疲労性の判定方法

Legal Events

Date Code Title Description
AS Assignment

Owner name: JATCO LTD, JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KATOU, GOU;YOSHIDA, MAKOTO;REEL/FRAME:016402/0958

Effective date: 20050224

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION