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1. 发明专利

JPH04327032A SPRING SEAT DEVICE 失效
公开(公告)号：JPH04327032A
公开(公告)日：1992-11-16
申请号：JP9773191
申请日：1991-04-26
申请人： TOYOTA MOTOR CORP , TOGO SEISAKUSHO KK
发明人： TAKAHASHI YOSHITAKA , MANABE AKIRA , IZAWA YOSHINOBU , OOTA TAKAYA
IPC分类号： F01L3/10 , F16F1/12
摘要： PURPOSE:To increase surging generating engine speed by preventing line abrasion on an end of a valve spring, suppressing the rolling of the valve spring, and stabilizing a compression motion. CONSTITUTION:An upper projection part 17 having a groove is provided on a seat face 9a of a retainer 7, while a lower projection part 18 having a groove is provided on a seat face 4a of a spring seat 4. Both grooves have circular arc shape in cross section. Upper and lower coils 14, 15 of a valve spring 11 are in contact to or separated from the grooves. In case that a line diameter of the valve spring 11 is X, a mean coil diameter is D, heights on ends of upper and lower seat winding parts 12, 13 in a direction of axis L are H, and pitch angles of the upper and lower coils 14, 15 on the valve spring 11 under an installation condition are B, a curvature diameter Y of the groove is indicated by the following equation: 0.5X (H/D)

2. 发明专利

JPH09157875A TREATMENT BEFORE WELDING FOR SINTERED MEMBER 失效
公开(公告)号：JPH09157875A
公开(公告)日：1997-06-17
申请号：JP31684795
申请日：1995-12-05
申请人： TOYOTA MOTOR CORP
发明人： TAKAHASHI YOSHITAKA , MORI TOSHIHIRO
IPC分类号： B23K9/235 , B22F3/24 , B23K26/21 , C23G5/00 , B23K26/00
摘要： PROBLEM TO BE SOLVED: To remove oil contained in a sintered member without deteriorating its dimensional accuracy and strength by subjecting a sintered member obtd. by sintering Fe base metal powder and executing machining to heating treatment at a specified temp. before welding. SOLUTION: A sintered member is subjected to heating treatment at 100 to 350 deg.C in a nitrogen atmosphere under the ordinary pressure or in an air atmosphere under the ordinary pressure to the reduced pressure. Oil or the like stuck to the pares of the sintered members is removed at the time of machining, and the content thereof is regulated to

3. 发明专利

JPH09155576A METHOD FOR WELDING SINTERED MEMBER 失效
公开(公告)号：JPH09155576A
公开(公告)日：1997-06-17
申请号：JP31689395
申请日：1995-12-05
申请人： TOYOTA MOTOR CORP
发明人： TAKAHASHI YOSHITAKA , NAKAMURA HITOSHI
IPC分类号： B23K26/32 , B22F7/08 , B23K26/21 , B23K26/00
摘要： PROBLEM TO BE SOLVED: To enable satisfactory welding without removing oil component contained in a sintered member by providing a degassing groove liberating to the air at least either on the welding surface of the sintered member or on the surface to be welded of the opposite member and then welding both surfaces. SOLUTION: A sintered rough shape material is machined for sizing under the conditions of dripping cutting oil to form a cylindrical sintered member 1. On the upper end of the sintered member 1, a placing surface 1a as a welding surface is formed having steps inside. In addition, on the placing surface 1a, a concentric first degassing groove 1b is provided at the boundary of the inside of the steps, as is a second degassing groove 1c communicating with the first groove 1b outside. Then, with the opposite member 2 placed on the placing surface 1a of the sintered member 1, both are assembled. Consequently, in welding the sintered member 1 to the opposite member 2, satisfactory welding is possible free from defects such as blowholes in the weld zone without removing oil component contained in the sintered member 1.

4. 发明专利

JPH07138714A WEAR RESISTANT IRON-BASED SINTERED ALLOY AND ITS PRODUCTION 失效
公开(公告)号：JPH07138714A
公开(公告)日：1995-05-30
申请号：JP11797094
申请日：1994-05-31
申请人： TOYOTA MOTOR CORP
发明人： TAKAHASHI YOSHITAKA , KANEKO TADATAKA , DAIZA SETSUHITO , ITO YOSHIHIKO
IPC分类号： B22F3/26 , C22C33/02 , C22C38/00
摘要： PURPOSE:To produce an iron-based sintered alloy excellent in wear resistance. CONSTITUTION:Ni-based alloy power having a compsn. contg., by weight, 2 to 15% Co and 2 to 10%, preferably >3 to 10% Mo, and the balance Fe with inevitable impurities is mixed with Ni-based alloy powder having a compsn. contg. 5 to 20% Mo, 20 to 40% Cr, 10 to 20% W and 10 to 30% Fe, furthermore contg., if necessary, 0.5 to 4% C and

5. 发明专利

JPH06172942A WEAR RESISTANT IRON BASE SINTERED ALLOY 失效
公开(公告)号：JPH06172942A
公开(公告)日：1994-06-21
申请号：JP32571492
申请日：1992-12-04
申请人： TOYOTA MOTOR CORP
发明人： TAKAHASHI YOSHITAKA , KANEKO TADATAKA , OKAJIMA HIROSHI
IPC分类号： B22F1/00 , B22F5/00 , C22C33/02 , C22C38/00
摘要： PURPOSE:To produce an iron base sintered alloy for a valve seat excellent in wear resistance. CONSTITUTION:This sintered allay is obtd. by mixing iron base alloy powder contg., by weight, 2 to 15% Co and 3 to 10% Mo, and the balance Fe with inevitable impurities with total 2 to 30% of one or >= two kinds among the hard grains of ferromolybdenum powder, ferrochrome powder and ferrotungsten powder, 0.3 to 1.7% graphite powder and a lubricant for compacting and executing compacting and sintering. Since the solid solution homogenizing degree of the alloy elements to a matrix is high, excellent corrosion resistance, oxidation resistance and wear resistance can be obtd. by a low quantity of alloy compared to the case by the conventional method in which elemental powder is mixed. Since the compositional ranges of the alloy elements are regulated to the same ones, the lowering ratio of compressibility is small and there is no fear of affecting its oxidation resistance and corrosion resistance having close connection with the density.

6. 发明专利

JPH0657387A IRON-BASE SINTERED ALLOY FOR VALVE SEAT 失效
公开(公告)号：JPH0657387A
公开(公告)日：1994-03-01
申请号：JP23303892
申请日：1992-08-07
申请人： TOYOTA MOTOR CORP , SUMITOMO ELECTRIC INDUSTRIES
发明人： TAKAHASHI YOSHITAKA , KANEKO TADATAKA , OKAJIMA HIROSHI , MOTOOKA NAOKI , IWAGAKI HIROYUKI
IPC分类号： C22C33/02 , C22C38/00 , C22C38/18 , F01L3/02
摘要： PURPOSE:To produce an iron-base sintered alloy for a valve seat excellent in wear resistance, heat resistance and corrosion resistance and small in mating attackability. CONSTITUTION:Since the iron-base alloy constituting the fundamental structure is a one contg. 0.5 to 2.0% C and in which 2 to 10% total of one or two or more kinds from among Cr, Ni, Mn, Mo and V are incorporated into solid solution, the fundamental compsn. is strengthened to improve its heat resistance, corrosion resistance and wear resistance. Furthermore, since the hard grains const of a Co-base alloy contg. 30 to 50% Cr, 10 to 20% W, 5 to 15% Mo, 5 to 15% Fe and 0.5 to 3% C as well as a certain ratio of pores are incorporated in the hard grains and the specific gravity ratio is regulated to 20 to 80%, the ratio of the part functioning as the hard grains reduces, its mating attackability is small and it shows excellent wear resistance. Moreover, as a solid lubricant, by dispersing CaF2, MoS2 or MnS therein, its seizing resistance and machinability can be improved.

7. 发明专利

JPH0633201A IRON SERIES SINTERED ALLOY FOR VALVE SEAT 失效
公开(公告)号：JPH0633201A
公开(公告)日：1994-02-08
申请号：JP19423292
申请日：1992-07-21
申请人： TOYOTA MOTOR CORP , NIPPON FUNMATSU GOKIN KK
发明人： TAKAHASHI YOSHITAKA , KANEKO TADATAKA , ITO YOSHIHIKO , OKAJIMA HIROSHI , MAEJIMA TAKASHI
IPC分类号： C22C33/02 , C22C38/00 , F01L3/02
摘要： PURPOSE:To manufacture an iron series sintered alloy for a valve seat excellent in wear resistance, heat resistance and high temp. corrosion resistance. CONSTITUTION:Since 3 to 30% Co, Ni Mn or V is entered into solid solution in an Fe series base structure contg., by weight, 0.3 to 1.5% C and constituting a matrix, its strength is improved and also excellent heat resistance and corrosion resistance can be obtd. Furthermore, since Fe-Mo and Fe-W as hard grains, are dispersed into the base structure by 3 to 15%, its wear resistance can be improved. Moreover, as a solid lubricant, by dispersing CaFe2, MoS2 or MnS, its seizing resistance and machinability can be improved, and since its upper limit is regulated to 2.0% and also the opening porosity of a sintered body is regulated to

8. 发明专利

JPH01184254A SINTERED MEMBER 失效
公开(公告)号：JPH01184254A
公开(公告)日：1989-07-21
申请号：JP632688
申请日：1988-01-14
申请人： TOYOTA MOTOR CORP
发明人： TAKAHASHI YOSHITAKA
IPC分类号： C22C38/00 , C22C38/16
摘要： PURPOSE:To improve strength and toughness of the title member by forming a duplex-layer structure in which C content is regulated so that it is smaller at the surface side in a sintered member in which respective contents of Ni, Cu, Mo, C, and Fe are specified. CONSTITUTION:This sintered member has a composition consisting of, by weight, 1-6% Ni, 1-3% Cu, 0.2-1% Mo, 0.3-0.7% C, and the balance Fe. Moreover, the average carbon content in the above member is regulated so that it is smaller in the surface part than in the inside part, and further, the difference between the average carbon contents of both is regulated to 0.05-0.3%.

9. 发明专利

JPS6475651A SINTERED ALLOY COMBINING HIGH STRENGTH WITH WEAR RESISTANCE 失效
公开(公告)号：JPS6475651A
公开(公告)日：1989-03-22
申请号：JP23414487
申请日：1987-09-18
申请人： TOYOTA MOTOR CORP
发明人： TAKAHASHI YOSHITAKA
IPC分类号： C22C38/00 , C22C38/16
摘要： PURPOSE:To improve strength and wear resistance, by uniformly dispersing free graphite in a specific proportion into a ferrous sintered alloy containing specific amounts of Ni, Cu, Mo and combined carbon. CONSTITUTION:Atomized iron powder, carbonyl Ni powder, electrolytic copper powder, metallic Mo powder, and graphite powder are mixed, which is compacted. The resulting green compact is preheated in an N2-gas atmosphere at 800-900 deg.C and cooled slowly to undergo removal of distortion during forming and then heated at 1,050-1,150 deg.C for 5-60min to undergo sintering. By this method, a high-strength and wear-resistant sintered alloy in which free graphite is uniformly dispersed by 0.02-0.2% into a structure consisting of, by weight, 1-6% Ni, 1-2% Cu, 0.3-0.7% Mo, 0.3-0.8% combined carbon, and the balance Fe and which has >=7.2g/cm density can be obtained.

10. 发明专利

JPS63114903A POWER HAVING HIGH COMPRESSIBILITY FOR SINTERING AND ITS PRODUCTION 失效
公开(公告)号：JPS63114903A
公开(公告)日：1988-05-19
申请号：JP26231886
申请日：1986-11-04
申请人： TOYOTA MOTOR CORP
发明人： TAKAHASHI YOSHITAKA , SUDO SHUNTARO
IPC分类号： B22F1/00
摘要： PURPOSE:To develop powder having high compressibility for sintering to be used for producing a high strength sintered material by mixing powder of Cu or oxide of Cu with particles of a low carbon steel contg. specific small ratios of Mo and Mn and heating the mixture of stick the particles of Cu onto the surface of the low carbon steel particles. CONSTITUTION:The Cu powder or CuO powder having the average grain size of

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