摘要:
Ein Kugelgewindetrieb (10) umfasst eine Gewindespindel (12) mit einem ersten, freien Ende (16) und einem zweiten Ende (17), das mit einem Antrieb verbbindbar ist, und eine Spindelmutter (14), die die Gewindespindel (12) koaxial zumindest teilweise umschliesst. Eine Vielzahl von Kugeln (26), die im Zwischenraum zwischen Gewindespindel (12) und Spindelmutter (14) umlaufen bilden das Kernelement. Eine Verlängerungshülse (15), die koaxial an die Spindelmutter (14) anschliesst ist mit dieser fest verbunden ist und mit ihr relativ zur Gewindespindel (12) beweglich. Am ersten Ende (16) der Gewindespindel (12) ist am Aussenumfang der Gewindespindel (12) ein im Wesentlichen kreisförmiger Lagerring (18, 30, 50, 70) angebracht, der als Wellenlager zwischen Gewindespindel (12) und der Verlängerungshülse (15) dient und der durch mindestens ein integriertes Feder-/Dämpfungselement eine geräuschhemmende Wirkung entfaltet. Dieses Feder-Dämpfungselement des Lagerrings (30, 50, 70) ist bevorzugt eine Kombination von mindestens einer Einkerbung (32, 52, 72) am Innenumfang des Lagerrings (30, 50, 70) und einem Ringspalt (34, 54, 74).
摘要:
The present invention provides a ball screw device in which the shape of a ceiling surface of a deflector is so defined that an allowance for engagement is secured between a rolling ball and a retainer when the rolling ball moves inside a coupling passage. A ball screw device (40) includes a ball screw shaft (20), a ball nut (21), a deflector (43) forming a coupling passage (43b), a rolling ball (44), and a retainer (45). The coupling passage (43b) is defined by an outer circumferential ball rolling groove (23a1), a ridge (52), and a ceiling surface (43c). The ceiling surface (43c) has a first rounded portion (56) at which a projected shape of the ceiling surface (43c) seen in an axial direction has a first radius of curvature (R1) at least such that a constant first clearance (α1) is provided between the rolling ball (44) and the ceiling surface (43c), and a second rounded portion at which the projected shape has a second radius of curvature (R2) smaller than the first radius of curvature (R1) and which is located on a groove bottom side of the outer circumferential ball rolling groove (23a1).
摘要:
Provided are a nut, an attachment for nut and a screw shaft, which are fitted to a coating material coating device or a soldering device and can change a fixed position of the nut easier than that of a convention example even if any adhered matters generated when each device is used for a long time are fixed, and a soldering device using the same. The nut 10 screws on to the screw shaft 2 having a predetermined length. The nut 10 is provided with a non-meshing part 11 composed of a notch 12 that is formed parallel to a movement direction thereof by cutting off screw threads and a flange portion 13, which has connecting holes 14 for connecting another member. Under such a configuration, by forward and/or backward movement of the nut 10, the notch 12 functions as if it scraps the fixed matters 6.
摘要:
A production method of a ball screw device and a production method of a steering system using the ball screw device are provided. The ball screw device (40) includes a ball screw portion (23), a ball nut (42), rolling balls (43), and a retainer (45). The production method of the ball screw device (40) includes: a first preparation step (S10) of preparing a nut subassembly (41) as a standard product; a second preparation step (S20) of preparing the ball screw portion (23) in plurality by types as ranked products; a measuring step (S30) of measuring a relative displacement (ΔX1) in a thrust direction between the standard product and each ranked product; a determination step (S40) of determining whether the displacement (ΔX1) meets a displacement specification (H); a replacing step (S50) of, if the displacement (ΔX1) does not meet the specification (H), replacing the ranked product with another ranked product; and an assembling step (S60) of, if the displacement (ΔX1) meets the specification (H), assembling the standard product and the ranked product into the ball screw device (40).
摘要:
A linear motion actuator is provided of which the output member can be smoothly moved linearly even when lateral moment acts on the output member. A carrier (6) supporting planetary rollers (7) is axially immovable, while an outer ring member (5), as the output member, is axially slidably fitted in the radially inner surface of a cylindrical portion (1a) of a housing (1), and is rotationally fixed to a driven member through keys (22). Hard plating layers are formed on the radially outer surface of a rotary shaft (4), the radially outer surfaces of the planetary rollers (7), including helical grooves (7a), and the surface of a helical rib member (5b) which is fixed to the radially inner surface of the outer ring member (5) forming a helical rib.
摘要:
A mold oscillator includes: a ball screw unit that has a ball screw 32 having a threaded shaft 29 and a ball nut 30, and a nut-side shaft 31 fixed to the ball nut 30 coaxially with the threaded shaft 29, wherein the ball screw unit is positioned so that the central axis of the ball screw unit extends in the vertical direction; and a power transmitting mechanism that transmits rotation to the ball screw unit. Bearings rotatably support a first shaft. A second shaft that is the other of the threaded shaft and the nut-side shaft is connected to the mold side. An attachment portion to fix the mold oscillator at an installation position is provided so as to be immovable relative to the bearings in the vertical direction and is configured to be able to change the relative position between the bearings and the second shaft in the vertical direction in a state where operation of the mold oscillator is stopped.
摘要:
A ball screw device is provided for which quality can be easily evaluated. The ball screw device includes a threaded shaft with a groove formed on an outer peripheral surface of the shaft, and a cylindrical nut (60) whose screw-thread mates with the groove on the threaded shaft via a plurality of balls. The nut (60) has a pair of mounting holes in each of which a deflector is installed and a communication groove (67) that allows the mounting holes to communicate with each other and is open on the outer peripheral surface of the nut (60) and through which the balls (62) can roll. The width W of an opening (67a) of the communication groove (67) is smaller than the diameter (D1) of the ball (62).
摘要:
A linear electric actuator (10) for steering systems comprising: a casing (20), an electric motor (50), housed in the casing (20), which is provided with a stator (55) and a hollow rotor (60) internally concentric to the stator (55), a holder nut (80) internally fixed to the rotor (60), and a stem (85) having a thread (90) coupled to the holder nut (80), wherein the stem (85) comprises a first portion (105) provided with a surface treatment, which projects outside the casing (20), and a second portion (120) without said surface treatment, which is contained inside the casing (20) and in which said thread (90) is obtained.