Honda Giken Kogyo Kabushiki Kaisha

Honda Motor Co., Ltd.

Yamada Manufacturing Co., Ltd.

Shigeru Kanehara

Toru Yagasaki

Takamichi Shimada

Hideaki Aoyama

Hideaki Yoshida

Atsushi Fujikawa

Hirofumi Akagi

Mamoru Arikawa

Hideo Koyama

Kouhei Ohsono

Tooru Yagasaki

Takashi Aoki

Torao Hattori

Noboru Sekine

Toru Fujii

Masamichi Harada

Ken Kanokogi

Akihito Ohhashi

Keiichi Hanyu

Kosuke Yamane

Motonori Ohnuki

Hiroshi Wakui

Hideo Nirasawa

Shinichi Hirai

Tetsushi Miyazaki

Kenichi Namerikawa

Manabu Murakami

Tooru Fujii

Masahiko Shinohara

Shinya Kuwabara

Masashi Nakaoka

Takemasa Kurokawa

A frequency of a harmonic of a drive source frequency of a rotary drive source is defined as a harmonic frequency, a resonant frequency of a torque transmitting rotary body is defined as a rotary body resonant frequency, and a resonant frequency of an endless belt is defined as a belt resonant frequency. A control device of a vehicle controls the belt resonant frequency in a manner so as to suppress a triple overlapping state in which the drive source frequency or the harmonic frequency, the rotary body resonant frequency, and the belt resonant frequency coincide with or closely approximate each other.

Vehicle and vehicle control method

A hydraulic pressure supply apparatus for automatic transmission having a first and a second regulator valvesthat are installed in a first and a second oil passagesthat connect a hydraulic pumpfor pumping and discharging hydraulic oil from a reservoirand a plurality of hydraulic actuators and depressurize the hydraulic oil discharged from the pump to pressure required by the hydraulic actuators, a third and a fourth oil passagesthat convey discharged hydraulic oil to lubrication systemand an ejectorhaving a nozzleconnected to one of the third and fourth oil passages and an intakeconnected to the reservoirsuch that hydraulic oil merged at a diffuseris conveyed to the lubrication systemthrough a fifth oil passage, hydraulic energy generated by the hydraulic pump can be effectively utilized in an automatic transmission having the hydraulic actuators and lubrication system.

Hydraulic pressure supply apparatus for automatic transmission

A metal element deformation state detection device is provided in which since a plurality of the metal elements are in line contact with each other via a rocking edge and are aligned in an arc shape to form a metal element row, a light source is disposed on the radially inner side or the radially outer side of the arc of the metal element row, and a deformation state of the metal element is detected by observing passed-through light that has been emitted from the light source and has passed through a gap between adjacent metal elements, slight deformation in the metal element can reliably be detected.

Metal element deformation state detection device

In a hydraulic pressure supply apparatus for an automatic transmission having hydraulic pressure supply destinations comprising at least three hydraulic actuators different from one another in required hydraulic pressure and a lubrication system, there are provided with at least three, actually five, hydraulic pumps, at least three, actually five, regulator valves capable of regulating hydraulic pressures delivered from the hydraulic pumps to values corresponding to the respective required pressures to be supplied to the hydraulic pressure supply destinations, and the selector valves installed between the hydraulic pumps and the regulator valves, wherein the operation of the selector valves is controlled to connect the hydraulic pumps to the regulator valves in accordance with the flow rates required by five hydraulic pressure supply destinations comprising the hydraulic actuators and the lubrication system.

In a gear pump in which a driving rotor that is driven by a driving source meshes with a driven rotor that is driven by the driving rotor for rotation to pump a hydraulic oil, only one of the driving rotor and the driven rotor is given the steam treatment while the other remains untreated.

Gear pump

In an apparatus for controlling a continuously variable transmission, a transmission ratio, an input shaft rotational speed and an input torque, etc., are detected, an axial thrusts of the drive and driven pulleys are detected therefrom, an inter-shaft force is detected, a friction coefficient of the driven pulley including at least a radial component of the friction coefficient &#x3bc;RDN is calculated in accordance with predetermined relational equations, a target axial thrust of the driven pulley is calculated based on at least the friction coefficient and the axial thrust of the driven pulley is controlled based on the calculated target axial thrust.

Control apparatus for continuously variable transmission

A coefficient of friction correction device for a belt-type continuously variable transmission is provided in which the coefficient of friction corrector calculates a coefficient of friction correction factor from the coefficient of friction calculated by the coefficient of friction calculator for a predetermined gear ratio and the default value of the coefficient of friction stored in the coefficient of friction map for the predetermined gear ratio, and uniformly corrects the default value of the coefficient of friction stored in the coefficient of friction map for each gear ratio using the coefficient of friction correction factor. This enables the default values of the coefficient of friction of all the coefficient of friction maps to be corrected by calculating just one coefficient of friction correction factor, and enables the reliability of the corrected default value of the coefficient of friction to be ensured.

Coefficient of friction correction device for belt-type continuously variable transmission

In a metal ring for a metal belt of a belt type continuously variable transmission, a relationship is established between a compressive residual stress of a metal ring of an innermost layer imparted by a nitriding treatment and a free state radius of the metal ring nondimensionalized by a minimum winding radius. In the relationship, the sum of a compressive residual stress acting on the inner peripheral face of the metal ring, a compressive stress due to flexure and a contact stress does not exceed the elastic deformation limit of the metal ring. The maximum compressive stress of the metal ring does not become excessive, and an abrasion resistance of the surfaces of the metal ring is guaranteed.

Metal ring for metal belt

A belt (metal V belt) has a number of elements held by a ring in an endless shape and aligned in a peripheral direction of the ring. The element includes a head portion, a neck portion and a body portion. The body portion has a V face brought into contact with a drive pulley and a driven pulley and left and right locking edge portions wrapped with the ring and disposed on an inner peripheral side of the ring. The head portion is disposed on an outer peripheral side of the ring and having an ear portion extended to left and to right sides to be opposed to the locking edge portion. The neck portion integrally connects the body portion and the head portion. Front faces of the ear portion, the neck portion and the locking edge portion of the element are formed with contact portions capable of bringing the contiguous elements into contact with each other.

Belt for continuously variable transmission

In a continuously variable transmission metal belt, a lateral-most projecting portion of a side edge of a metal ring assembly wherein each metal ring is located between a radially central plane and a radially inner peripheral surface of the metal ring. A contact point in which the projecting portion abuts against a V-face of a pulley is closer to the radially central plane than to the radially inner peripheral surface. Moreover, as the metal rings are laminated on one another, recesses are formed between the side edges of the adjacent metal rings to retain oil therein, which lubricates the sliding faces of adjacent metal rings and enhances durability of the assembly.

Continuously variable transmission metal belt, process for producing metal ring, and process for measuring shape of metal ring

A metal belt includes a metal ring assembly formed from a plurality of layered endless metal rings, and a large number of metal elements supported on the metal ring assembly, the metal belt assembly being wound around a pulley and transmitting a driving force. The clearance between adjacent metal rings is set to be in a range from negative to positive from the innermost ring to a middle ring and to be only positive from the middle ring to the outermost ring. Therefore, good lubricating conditions can be maintained by virtue of the clearance being always positive for sliding surfaces of the metal rings from the middle ring to the outermost ring, for which lubrication easily becomes insufficient in the prior art. Thus the behavior is stabilized, preventing a side face of the metal ring from coming into dynamic contact with a metal ring contact face of a neck portion of the metal element, and maintaining the tension of the metal ring in the innermost ring at a low level, so that friction is suppressed to extend the life of the ring.

Metal belt

A belt for a continuously variable transmission comprises endless plate-like ringsand a plurality of plate-like elements, which are placed adjacent to one another and slidably on the rings, so that the ringsare disposed on the saddle portionsof the elements, respectively. In each element, a first recessis provided at the upper innermost part of each saddle portionsuch that the first recessis continuous to a corresponding lower side end of the neck portion. In addition, a second recessis provided at the lower innermost part of each ear portionsuch that the second recessis continuous to a corresponding upper side end of the neck portion. At least one of the first and second recessesandis in an elliptic arc figure, in a compound arc figure that comprises various circular arcs or in a compound arc figure that comprises an elliptic arc and one or more circular arcs.

Protrusions formed on an inner peripheral surface of at least an innermost metal ring of a belt for a continuously variable transmission are initially worn. An average contact widthof the protrusions, measured in a direction perpendicular to a direction of travel of the metal ring, is equal to or less than 16 &#x3bc;m. The development of pitching at a top of the protrusion in a depthwise direction is inhibited. Shallow pitching is eliminated due to the contact between the protrusion and a metal element, which prevents the generation of cracks. When the metal ring and the metal element are conformed to each other, the average Hertz's surface pressure is lowered, whereby the pitching is difficult to occur. Also, the top of the protrusion is worn, leading to an improved surface roughness, whereby the lubrication is enhanced, resulting in an enhancement of metal ring durability.

A belt for a continuously variable transmission includes a metal ring assembly and a plurality of metal elements formed of a carbon steel and supported on the metal ring assembly. A recess of the metal element at which stress concentrates, namely, undercut portions of a root of a neck, a root of an engaging projection, and recesses of an element body, are removed. The carbon concentration in the removed portions is lower than that in the other potions, thereby enhancing the toughness, fatigue strength, and impact strength while maintaining, at a high level, the surface hardness of portions at which stress does not concentrate, thereby obtaining a wear resistant belt.

A free-state diameter (a diameter in a state in which a residual stress has been released by cutting) of each of metal rings in a continuously variable transmission) is determined so that a predetermined compression stress and a predetermined tensile stress are applied to outer and inner surfaces of the metal ring in an endless state in which the metal ring is not cut, respectively. When the metal ring is cut in order to measure the free-state diameter, the metal ring is cut at least at two points so that cut ends do not interfere with each other in the free state, and the free-state diameter is then measured. Thus, the free-state diameter of the metal ring in a continuously variable transmission can be accurately measure.

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Wako, Japan

Shigeru Kanehara