1. A hydraulic power steering apparatus, comprising:
an input shaft;
an output shaft connected to said input shaft so as to be capable of elastic relative rotation in accordance with steering torque;
a hydraulic actuator for generating steering assist power;
a control valve for controlling hydraulic pressure of oil supplied to said hydraulic actuator in accordance with the amount of relative rotation between said input shaft and said output shaft;
a restricting device for restricting the relative rotation between said input shaft and said output shaft in accordance with a driving condition of a vehicle;
said restricting device having a guide bore formed in one of said input shaft and said output shaft, a plunger inserted into said guide bore so as to be capable of reciprocal movement toward the direction in which the plunger approaches to and goes away from the other of said input shaft and said output shaft, and a hydraulic pressure adjustment mechanism for adjusting hydraulic pressure for pressing the other of said input shaft and said output shaft via said plunger in accordance with said driving condition of the vehicle; and
said plunger being guided by the inner circumference of said guide bore to the reciprocal movement direction when said input shaft and said output shaft rotate relatively;
wherein a friction reducing element is interposed between the inner circumference of said guide bore and the outer circumference of said plunger.
2. The hydraulic power steering apparatus according to claim 1, wherein said friction reducing element is spheres rolling between the inner circumference of said guide bore and the outer circumference of said plunger.
3. The hydraulic power steering apparatus according to claim 2, wherein, in at least one of the inner circumference of said guide bore and the outer circumference of said plunger, three or more rows of raceway grooves are formed along the reciprocal movement direction of said plunger, with spacing in the circumferential direction of said guide bore, and said plural spheres are disposed in each of said raceway grooves.
4. The hydraulic power steering apparatus according to claim 1, wherein said friction reducing element is interposed between the inner circumference of said guide bore and the outer circumference of said plunger, by being coated on or pressed into one of the inner circumference of said guide bore and the outer circumference of said plunger.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An apparatus for manufacturing a float glass, comprising:
a float bath in which a molten glass moves on a surface of a floatable molten metal to form a glass ribbon;
a casing deformation preventing member for allowing an inert gas to flow around an end casing at an outlet of the float bath to prevent the end casing from deforming;
a dross box disposed adjacent to a downstream end of the float bath and having lift-out rollers for drawing the glass ribbon;
an introduction member for introducing an inert gas into the dross box; and
a recycling path for supplying an inert gas, which discharges from the casing deformation preventing member, to the introducing member.
2. The apparatus for manufacturing a float glass according to claim 1, further comprising a heating member installed at the recycling path.
3. The apparatus for manufacturing a float glass according to claim 1, wherein the inert gas includes argon, nitrogen or carbon dioxide.
4. The apparatus for manufacturing a float glass according to claim 2, wherein the heating member preheats the inert gas to about 600 to 850\xb0 C.
5. A method for manufacturing a float glass, which continuously supplies a molten glass onto a surface of a molten metal received in a float bath to form a glass ribbon and which pulls the glass ribbon from an outlet of the float bath and carries the glass ribbon to a cooling lehr, the method comprising:
supplying at least a part of inert gas, which is used for preventing an end casing of the float bath from deforming, into a dross box disposed between the float bath and the cooling lehr.
6. The method for manufacturing a float glass according to claim 5, wherein the inert gas is preheated by the heating member.
7. The method for manufacturing a float glass according to claim 5, wherein the inert gas includes argon, nitrogen or carbon dioxide.
8. The method for manufacturing a float glass according to claim 5, wherein the inert gas is preheated to about 600 to 850\xb0 C.
9. A float glass manufactured by the method according to claim 5.
10. A float glass manufactured by the method according to claim 6.
11. A float glass manufactured by the method according to claim 7.
12. A float glass manufactured by the method according to claim 8.