摘要:
A production method of a rolling/sliding part which includes applying a spherodizing annealing treatment to a steel to render an average particle diameter of the carbide of the surface layer portion in a range of 0.3 to 0.6 μm and a maximum particle diameter thereof 4 μm, to render the surface hardness 62 or more by Rockwell C hardness and to render a solid solution carbon amount in a residual austenite of the surface layer portion in a range of 0.95 to 1.15% by weight.
摘要:
There is provided a bearing constituent member capable of achieving a long life of a rolling bearing and securing sufficient static loading capacity and dimensional stability and a production process thereof as well as a rolling bearing having a long life and exhibiting sufficient static loading capacity and dimensional stability.A workpiece obtained from a steel containing 3.2 to 5.0% by mass of Cr and 0.05% by mass or more to less than 0.5% by mass of V is subjected to a heat treatment such as a carbonitriding treatment.Thereby, the following are achieved: the content of C in the surface layer ranging from the surface of the bearing constituent member of the rolling bearing to 10 μm is 1.1 to 1.6% by mass, Vickers hardness at the position of a depth of 50 μm from the surface is 740 to 900 (Rockwell C hardness is 62 to 67), the γ amount at the position of a depth of 10 μm from the surface is 20 to 55% by volume, particles composed of vanadium nitride having a particle diameter of 0.2 to 2 μm and/or particles composed of vanadium carbonitride having a particle diameter of 0.2 to 2 μm are present in the surface layer ranging from the surface to 10 μm, and the area ratio of the particles in the surface layer ranging from the surface to 10 μm is 1 to 10%.
摘要:
The invention provides a rolling-sliding part which can attain more prolonged service lives even when used in rolling bearings which are exposed to contaminated lubricating oil. Rolling-sliding parts are made of steel which contains C: 0.7 to 0.9 wt. %, Si: 0.05 to 0.7 wt. %, Mn: 0.05 to 0.7 wt. %, Cr: 3.2 to 5.0 wt. %, Al: 0.04 wt. % or less, P: 0.03 wt. % or less, S: 0.03 wt. % or less, Ti: 0.005 wt. % or less, O: 0.0015 wt. % or less, at least one of Mo: less than 1.0 wt. % and V: less than 0.50 wt. %, and Fe and unavoidable impurities: balance, and which has a carburized layer in the surface. The precipitated carbide content of the layer is adjusted to 9 to 30% in terms of area ratio. At least 50% of the precipitated carbides present in the layer are of M7C3-type and/or M23C6-type in terms of area ratio. The average particle size of the carbides present in the layer is adjusted to 0.2 to 0.4 μm and the residual austenite content of the layer is adjusted to 35 to 60%.
摘要:
The invention provides a rolling/sliding part that can elongate the service life and can increase the static load capacity to improve the indentation resistance to an indentation due to plastic deformation during rest and low-speed rotation. The rolling/sliding part is formed from a steel that contains C: 0.7 to 0.9% by weight and Cr: 3.2 to 5.0% by weight and has a surface layer portion of which surface is carburized. An area ratio of total precipitated carbide of the surface layer portion is set in the range of 15 to 25%. Of the total precipitated carbide present in the surface layer portion, 50% or more by area ratio of carbide is rendered a M7C3 type and/or M23C6 type. An average grain diameter and a maximum grain diameter of the surface layer portion are set in the range of 0.3 to 0.6 μm and at 4 μm, respectively. The surface hardness is set at 62 or more by Rockwell hardness C. A solid solution carbon amount in residual austenite of the surface layer portion is set in the range of 0.95 to 1.15% by weight.
摘要翻译:本发明提供一种滚动/滑动部件,其可以延长使用寿命并且可以增加静态载荷能力,以改善由于休息和低速旋转期间的塑性变形而导致的凹陷的耐压痕性。 滚动/滑动部分由含有C:0.7至0.9重量%且Cr:3.2至5.0重量%的钢形成,并且具有表面被渗碳的表面层部分。 表面层部分的总沉积碳化物的面积率设定在15〜25%的范围内。 存在于表面层部分中的总沉积碳化物中,碳化物的面积比为50%或更多,为M 7 N 3 N 3+型和/ 23类型6类型。 表面层部分的平均粒径和最大粒径分别设定在0.3〜0.6μm的范围和4μm的范围内。 表面硬度通过洛氏硬度C设定在62以上。表层部的残留奥氏体中的固溶碳量为0.95〜1.15重量%。
摘要:
A bearing constituent member includes a surface layer, at least one of particles composed of vanadium nitride having a particle diameter of 0.2 to 2 μm and particles composed of vanadium carbonitride having a particle diameter of 0.2 to 2 μm are present in the surface layer ranging from the surface to a depth of 10 μm and at least one of the area ratio of the particles composed of vanadium nitride having a particle diameter of 0.2 to 2 μm and the particles composed of vanadium carbonitride having a particle diameter of 0.2 to 2 μm in the surface layer ranging from the surface to a depth of 10 μm is 1 to 10%.
摘要:
A hybrid drive system for a motor vehicle, including an engine, a motor/motor, an automatic transmission disposed between the engine and a vehicle drive wheel, a regenerative braking device for applying to the vehicle a regenerative braking force corresponding to an amount of electric energy generated by the motor/generator during an operation of the motor/generator by a kinetic energy of the running vehicle, and at least one of (a) a shift inhibiting device for inhibiting a shifting action of the automatic transmission during an operation of the regenerative braking device so as to prevent a change of an engine braking force applied to the vehicle, (b) a braking shift control device which is operated when the regenerative braking device is inoperable to provide the required regenerative braking force, for changing the speed ratio of the automatic transmission to increase the engine braking force, or operated prior to the operation of the regenerative braking device, for controlling the speed ratio of the transmission so as to apply the engine brake to the vehicle, and (c) a mode change inhibiting device for inhibiting a change of operation mode between regenerative braking mode and engine braking mode during regenerative braking or engine braking.
摘要:
An oil pressure controller of an automatic transmission which is capable of supplying engaging pressures to hydraulic servos of two frictional engaging elements which require different engaging pressures by a single pressure governing valve with a good pressure governing accuracy. The oil pressure controller comprises a hydraulic power source (10), hydraulic servos (70 and 80), signal pressure generating means (20), a pressure governing valve (30) for governing an oil pressure (P.sub.s) from the hydraulic power source (10) by a signal pressure (P.sub.ACC) and a control valve (40). The pressure governing valve (30)has a pressure receiving face A.sub.1 to which the signal pressure is applied, a pressure receiving face A.sub.2 to which the engaging pressure (P.sub.s) is fed back in the opposite direction and a pressure receiving face (A.sub.3) for selecting whether the feedback of the engaging pressure is present or not in order to change the control gain of the pressure governing valve (30)in response to the change of the control valve (40) for selecting the hydraulic servo (70 or 80) to which the oil pressure is supplied.
摘要:
When an engine is in operation an ignition switch is turned off by a driver an ECU executes a program including the step of actuating an electric motor driven oil pump.
摘要:
A control device causes a motor-generator to stop while a shift lever is set to a neutral position, and changes the rotation speed of an electric oil pump from a first rotation speed to a second rotation speed lower than the first rotation speed if a state of the electric oil pump in a hydraulic pressure control device enters a state where it is not preferable to continue operation at the first rotation speed. Preferably, the control device warns a driver to change the shift lever position from the neutral-position to another position if the vehicle satisfies a prescribed warning condition. Further preferably, the control device sets the vehicle to a running non-permitted state if the shift lever position is not changed from the neutral position to another position after warning.
摘要:
Lubricating oil supply holes are drilled into a first member that is fitted to a plurality of first annular plates by a spline. Of splines to which each lubricating oil supply hole corresponds, lubricating oil grooves provided in the plurality of first annular plates do not overlap the splines on at least one of the front and rear surfaces of the first annular plates, and therefore lubricating oil flowing out of the lubricating oil supply holes is dispersed in a circumferential direction and flows from the inner periphery to the outer periphery of the first annular plates, rather than gathering in each lubricating oil groove and flowing in an outer peripheral direction. As a result, a force generated by an axial lubricating oil flow, which acts in a direction for causing the second annular plates to contact friction materials on the first annular plates, is suppressed, leading to a reduction in drag torque.