Abstract:
There is provided a steering mechanism for an automobile. The steering mechanism comprises a housing defining an opening, a column shaft rotatably mounted in the housing, a pinion on the column shaft, a rack bar engaging the pinion, a first yoke slidable within the opening, a yoke stopper fitted in the opening, a second yoke disposed within the first yoke and having a ring at one end, a first spring interposed between the ring and yoke stopper, and a second spring interposed between the second yoke and yoke stopper.
Abstract:
A rack bar and pinion assembly includes a rack bar 1 having a rack biased into operative engagement with a pinion 2 mounted in a pinion housing 3, under all steering loads. A support assembly 4 includes a rack bar carrier 5 consisting of carrier members 5a and 5b biased into engagement with support surfaces 1a and 1b of the rack bar by a coil spring 6. Under heavy steering loads, the rack bar 1 moves along the axis X--X and a third surface 1c is also capable of engaging in low friction manner with a roller 7 located at a predetermined clearance from the remote side of the rack bar 1 when the rack is in substantially fully enmeshed engagement with the pinion 2.
Abstract:
A rack shaft supporting device includes a support yoke, a plug that closes the other opening of an accommodation chamber, a ball screw mechanism between the support yoke and the plug, and a torsion urging member between the ball screw mechanism and the plug. The ball screw mechanism includes: a first threaded portion in which a first thread groove is formed; a second threaded portion in which a second thread groove is formed; and balls arranged in a rolling path formed of the first thread groove and the second thread groove. The torsion urging member rotates the second threaded portion relative to the plug and moves the second threaded portion toward the support yoke.
Abstract:
Since a rigid supporting structure for a gear box GB and a rolling type rack supporting device RSD are employed, an electric power steering apparatus having no response delay and having a high transmission efficiency can be realized. Further, a high steering performance required for a long period and a steering assist force that is increasing recently can be efficiently transmitted to wheels. Further, when the wheels collide with a shoulder of a road to receive a counter input, a torque sensor TS detects a torque and an assist steering force against the counter input is outputted to an output shaft OS. Consequently, the torque of the counter input is restrained from being transmitted to a steering shaft SS side. Thus, a kick back and a vibration are advantageously hardly transmitted to a steering wheel SW from the wheels.
Abstract:
A rack and pinion steering gear 10 including a pinion shaft 11 coupled to a steering shaft, a rack shaft 12 which meshes with the pinion 11, and a rack guide 14 having provided thereon a metallic roller 16 adapted to roll on a back side of the rack shaft 12 and adapted to support the rack shaft 12 via the metallic roller 16, wherein the metallic roller 16 has an elastic member 32 which is partially secured to a rolling contact surface 29 thereof in a circumferential direction, whereby the metallic roller 16 is brought into contact with the back side of the rack shaft 12 at a metallic portion of the rolling contact surface 29 and the elastic member 32 By this configuration, the generation of abnormal noise can be suppressed, and the increase in driving stability of the vehicle can be realized.
Abstract:
A pinion shaft rotated by a steering wheel has a pinion gear formed thereon. A rack bar has at a front surface thereof a toothed rack portion meshed with the pinion gear of the pinion shaft. A rotating member is arranged to support a rear surface of the rack bar while being permitted to rotate when the rack bar moves axially. A biasing mechanism that biases the rotating member toward an actually meshed portion between the toothed rack portion and the pinion gear. A supporting member is arranged to slidably support the rear surface of the rack bar.
Abstract:
An electric power steering apparatus capable of outputting an auxiliary steering force by an electric motor, includes a support device (20) supporting a rack shaft (10). The rack shaft (10) has support device guide surfaces, i.e., rolling surfaces (10b, 10b) extending in a longitudinal direction in at least two portions on an outer peripheral surface. The support device (20) has cylindrical rollers (23) rolling on the rolling surfaces (10b, 10b) in directions intersecting each other while pressing the rolling surfaces in a case where the rack shaft (10) is viewed in the longitudinal direction. Therefore, the rack shaft (10) can be supported by the cylindrical rollers (23) with a low friction, and the rolling surfaces (10b, 10b) provided on the outer peripheral surface of the rack shaft (10) are pressed by the cylindrical rollers (23), whereby the rack shaft (10) can be supported from two different directions. Hence, an axis of the rack shaft (10) and an axis of a pinion (3) intersect each other at an angle other than 90 degrees, thereby providing a configuration suitable for supporting the rack shaft (10) where a rotational torque occurs when in operation. When depicting directions of pressing forces applied on the rolling surfaces (10b) from the cylindrical rollers (23) respectively with lines, an intersection (K) of these lines is shifted from a center O of the rack shaft (10). It is therefore possible to prevent the rack shaft (10) from rotating and to press rack teeth (10a) against pinion teeth (3a) in a stable state by a resultant force of the pressing forces.
Abstract:
A steering gear assembly includes a pinion defining a pinion axis and a rack defining a rack axis. A bearing assembly includes a roller bearing biased against the rack to generate a normal force pressing the rack into engagement with the pinion. The bearing assembly engages an outer surface of the rack at two points circumferentially spanning a large degree to provide improved support. The roller bearing is preferably a plurality of ball bearings engaging an outer race. A deformable member may be utilized that is positioned between the outer race and the rack housing. The deformable member may comprise a series of O-rings which providing a force biasing the outer race towards the pinion.
Abstract:
A rack and pinion steering gear (10) comprises a housing (12) having an axially extending passage (14) and a yoke bore (18) that intersects the axially extending passage (14) within the housing (12). A pinion gear (26) is rotatably mounted in the housing (12). A rack bar (34) extends through the axially extending passage (14) and is movable relative to the pinion gear (26). The rack bar (34) has teeth in meshing engagement with teeth (32) of the pinion gear (26). A yoke assembly (54) is located in the yoke bore (18) of the housing (12) for at least partially supporting and guiding movement of the rack bar (34) relative to the pinion gear (26). The yoke assembly (54) comprises a yoke (56) having first and second roller assemblies (154 and 166) for contacting the rack bar (34) and rotating during movement of the rack bar (34). A first spindle (112) supports the first roller assembly (154) and a second spindle (114) supports the second roller assembly (166).
Abstract:
A rack and pinion steering gear (10) comprises a housing (12). A yoke assembly (40) is in the housing (12) for at least partially supporting and guiding movement of a rack bar (34) relative to a pinion gear (26). The yoke assembly (40) comprises a yoke (42) and a plurality of rotatable members. The yoke (42)has a first end surface (48) and an axis (A) that extends transverse to the direction of movement of the rack bar (34). Each of the plurality of rotatable members is supported by the yoke (42). A portion of each rotatable member projects outward of the first end surface (48) of the yoke (42) for contacting the rack bar (34). Each rotatable member is rotatable about its axis and is fixed against movement along the yoke axis (A) relative to the yoke (42).