JPS60189672A - Power steering device - Google Patents

Abstract

PURPOSE:To make an operating part settable in an optional position or angle irrespective of the position or direction of a driven part, by connecting the operating part such as a wheel shaft or the like to the driven part such as a tie rod or the like with a control cable having flexibility. CONSTITUTION:An operating part 1 is provided with a wheel shaft 10 and a wheel being tightly attached to one end of the wheel shaft 10, while a first casing 4 is made so as to slide in response to rotation of the wheel via a rack in design. The operating part 1 and a driven part 2 both are connected with each other through a push-and-pull control cable 3 which consists of the first casing 4 at the side of the operating part 1, an outer casing 8 whose both ends 6 and 7 are locked to a second casing 5 at the side of the drive part 2 and an inner cable being housed inside the outer casing. With a flexible cable utilized, both of the operating part and driven part are coupled together so that a setting spot for the operating part is selectable at will.

Description

[Detailed Description of the Invention] Related. More specifically, the present invention relates to a power steering system for an automobile in which an operating part such as a steering wheel shaft and a driven part such as a tie rod can be separately attached to the vehicle body.

In general, four-wheeled vehicles such as passenger cars, trucks, and forklifts are equipped with a latch mechanism on the front two wheels or the rear two wheels to change the direction of travel of the vehicle. A support body that rotatably supports the axle of the two wheels in response to a rotational operation is provided so as to rotate around a steering axis such as a king pin.

However, in all conventional latch mechanisms, the steering wheel shaft and rudder gear are directly connected, so it is difficult to use when a power unit that requires a complicated hydraulic circuit is installed, or when a front-drive/front-engine car is installed. When the rudder pawl mechanism is complicated, it is extremely complicated to pass the long handle shaft into the narrow engine room and connect it to the steering gear.

Furthermore, there is a problem in that the degree of freedom of selection is relatively limited in designing work for appropriately arranging various members. Also, the long handle shaft increases the vehicle body weight! In addition, there is a problem in that it is difficult to install or design a shock absorbing handle for safety. Especially forklift I
- For cars with a steering wheel 4J or 4M installed on the rear wheel side, the steering shaft and rake mechanism become complicated. In order to balance the 15, it is necessary to operate the steering wheel while supporting the weight on the rear wheels and the weight of the engine, so a power steering device is often installed.For this reason, a power steering device is often installed. There is a problem in that the connection of the pawl mechanism is more complicated.

On the other hand, in order to explain problem 1-1, push-pull con 1
~ Although it is possible to connect the short steering wheel shaft and the rotating shaft of the steering gear with a control cable such as a roll cable or a toothed cable, it is possible to sufficiently and safely transmit steering wheel operating torque reaching 10 to 15 m-kg. In order to do this, a control cable with an extremely large diameter is required, and if the wiring work is not taken into consideration, it cannot be put to practical use.

Therefore, as a result of various studies, the inventor of the present invention has found that when combining a push/pull controller 1~roll cable that can transmit a relatively large 1~luke and a power unit for power steering as described later, each problem has been solved. The present invention was completed based on the new fact that it is possible to provide a power steering device that can solve the problems at the same time, is easy to install, and is easy to design in terms of layout.

That is, the present invention is a power steering device for an automobile for transmitting the rotational operation of a steering wheel rotatably installed near the driver's seat to the steering wheels,
A) The handle, a handle shaft having one end fixed to the handle, a first casing provided near the (+!!) end of the handle shaft, and a first casing provided slidably within the first casing. , a sliding member in which a first opening groove for inserting the inner cable is formed in sliding contact with the inner wall surface of the first casing, and the handle shaft and the sliding member are connected to each other when the handle shaft rotates. (B) the steering wheel; and (B) the steering wheel, which rotates around a substantially perpendicular line with respect to the steering wheel. a tie rod having a second opening groove formed on its surface for passing the other end of the inner cable; a second casing that is slidably housed therein; and a driven part that rightly moves a power unit for providing auxiliary power to the sliding movement of the tie rod; (C) one end of which is an end of the first frontage groove of the sliding member; an inner cable whose other end is engaged with the end of the second opening groove of the tie rod; and an outer casing for slidably guiding the inner cable from the first casing to the second casing. The gist of the invention is a power steering device comprising a push/pull control cable having a push/pull control cable.

Note that the power unit referred to in the claims refers to a power unit that amplifies the operating force in the sliding direction applied to the tie rod using a hydraulic servo mechanism, such as those used in conventionally known rack-and-binion bower sparring devices. It is a concept that includes all.

In addition, the concept of circumferential contact includes not only direct contact but also relative movement through a slight gap.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A power steering device (hereinafter simply referred to as the device) of the present invention will be explained with reference to the drawings.

FIG. 1 is a schematic perspective view showing an embodiment of the device of the present invention, FIG. 2 is a cross-sectional view taken along the lines (X) and -(X) in FIG. 1, and FIG. 3 is a (Y)-- (Y) line sectional view, FIG. 4 is an exploded perspective view of essential parts of the operating section shown in FIG. 3, and FIGS. 5 and 6 are schematic diagrams showing other embodiments of the operating section in the device of the present invention, respectively. A perspective view, FIG. 7 is a vertical sectional view of a main part showing an embodiment of the driven part in the device of the present invention, FIG. 8 is a partially enlarged view of FIG. 7, and FIG. 9 is a (Z)-- (Z) line sectional view.

As shown in FIG. 1, the device of the present invention is divided into two parts: an operating part (1) and a driven part (2).
) and driven part (2) are push/pull control cable (
3).

The push/pull control cable (3) has both ends (6) and (7) fixed to the first casing (4) on the operating part (1) side and the second casing (5) on the driven part (2) side, respectively. It consists of a flexible outer casing (8) and an inner cable (9) movably housed within the outer gauging (8). As the outer casing (8) and the inner cable (9), conventionally known push/pull control cables can be used.

In the present invention, (the pull operation part (1) has a handle shaft 00 rotatably provided near the driver's seat in an automatic vehicle) and a handle <11) fixed to one end of the handle shaft (10). ing.

The operating section (1) shown in FIG.
) A linear rack (<12> in Fig. 2) is used as a sliding member that moves by one movement in response to the rotation of the rack.

As shown in detail in FIG. 2, the rack <12) is linearly slidably inserted into the first casing (4). Rack teeth carved on the bottom side of the rack (12)
14) meshes with a pinion (15) fixed to the other end of the handle shaft (11). Therefore, the rack <12) moves in the directions of arrows (C) and (D>) in accordance with the rotation of the rotating shaft (11) in the directions of arrows (A) and (B).

A first opening 16) extending in the axial direction of the rack (12) is further formed on the lower surface side of the rack (12).

The lower surface of the rack (12) is in contact with the inner wall surface (17) of the first casing (4), so that a tubular passage (16a) is formed by the inner wall surface (17) and the first frontage groove (16). . An opening (18) is formed approximately in the center of the lower surface of the first casing (4).

The front end of a cable guide (20) having an inclined guide hole (19) is inserted into the frontage (18). The cable guide (20) is made up of two parts (20a) and (20b), as shown in FIG. 4, for example. II! (19a
), (19b) are formed. Therefore, by joining the two parts and fixing them to the first casing (4) as shown in Figure 2, the inclined guide hole (19) that is inclined with respect to the sliding direction of the rack (12) can be formed in the number plate. It will be done. One end of the inclined guide hole (19) opens toward the inner wall surface (17) and communicates with the passageway (16a) formed by the first opening groove (IG) and the inner wall surface (11). Inclined guide hole (19)
One end (6) of the outer casing (8) is fixed concentrically with the inclined guide hole (19) on the narrow end side of the outer casing (8).

The inner cable (
9) T-shaped cable end fitting (21) connected to one end
A locking groove (22) for locking is provided. The inner cable (9) is slidably guided by the passageway (16a), the inclined guide hole (19) and the outer casing (8) so as to be able to transmit force in the pushing and pulling directions, respectively.

The binion (15) has an annular shape 11 at a portion corresponding to the first frontage groove (16). (23) is formed,
Thereby, even if the binion (15) and the rack (12) mesh, the passage (16a) for the inner cable (9) is secured.

If the first ml0 groove is formed on the surface other than the chamfer where the rack @ (14) is formed, for example, the rack tooth (
14) is formed on the upper surface of the rack (12) and the first opening groove (19) is formed on the lower surface, the annular groove (23) may not be formed.

As shown in FIGS. 2 to 4, when forming a protrusion (24) at the tip of the cable guide (20) that slides into contact with the first opening groove (19), it is necessary to use an inclined guide from the first opening ff1 (1G). This is preferable because the inner cable (9) is smoothly guided into the L (19). Furthermore, a small guide groove (25) is formed on the bottom surface of the first frontage groove (16), and the protrusion (24)
) is provided with a small protrusion (2G) that is slidably inserted into the small guide groove (25), especially when operating the inner cable (9) in the pushing direction. from the first opening groove (16) to the inclined guide hole (1
9) is preferable because it allows a smooth transition.

In the operating section (1) shown in Figures 1 to 4, the tooth surface side of the rack (12) is arranged downward, but the connection direction of the push/pull control cable (3) to the driven section (2) is reversed. The rack (12) may be provided below the binion (15) with the tooth surface side facing upward. Further, the mounting angle of the first casing (4) is not limited to the horizontal direction, but can be set to any angle. - Furthermore, although a linear rack (12) is employed as an active member in the operation section (1) of FIGS. 1 to 4, the device of the present invention is not limited to such a case; As shown in FIG. 5 or FIG. 6, it may be a disc-shaped sliding member rotatably provided within the first casing (27).

In FIG. 5, a pulley (28) is fixed to the other end of the handle shaft as a Wl moving member. Boo IJ (2
8) (7) An annular first rmO groove (29) is formed on the outer periphery. The inner cable (9) is connected to the first opening groove (2).
7 outer casing (8) through a tangential guide hole (30) that extends in the tangential direction and is inserted into an annular conduit formed by the inner wall surface of the disk-shaped first casing (27).
).

One end (9a) of the inner cable (9) is connected to the first frontage groove (
29).

In FIG. 6, an internal gear (32) is used as a sliding member in place of the pulley (28) in FIG. 5. The teeth (33) of the internal gear (32) mesh with a binion (15) fixed to one end of the handle shaft.

In the case of Figures 1 to 4 and Figure 6, the binion (15)
The peripheral speed of is the operating speed of the inner cable (9), but in the case of FIG. 5, the peripheral speed of the pulley (28>) is the operating speed of the inner cable (9).

Note that instead of the internal gear (32) shown in FIG. 6, a normal gear (not shown) having tooth surfaces on the outer periphery may be used. In that case, an annular first frontage groove is formed on the outer periphery of the gear, that is, on the tooth surface, and if necessary, an annular first groove is formed on the gear and the pinion (not shown) that meshes with the gear. It is sufficient to form the same groove as the groove (23).

As shown in FIG. 7, the driven part (2) in the device of the present invention has a tie rod (35) and a second casing (5) that accommodates the tie rod (35) so as to be slidable in the axial direction. A cylinder (36) is provided concentrically with the second casing (5). A piston (37) fixed to a tie rod (35) is accommodated in the cylinder (36) so as to be slidable in the axial direction.

The piston (37>) and the cylinder (36) constitute a power unit together with a hydraulic pump (P), an oil tank (T), a servo valve (V), and a hydraulic pipe (S) connecting them.

Although Fig. 7 shows an integral type power unit I- in which the cylinder (3G) is integrally connected to the second casing (5), the hydraulic cylinder is installed almost parallel to the second casing (5). A linked pier type structure may also be adopted.

Connect the steering wheel ((4) in Figure 1) from both ends of the tie rod (35).
9) The connection ml up to ) is the conventional rack and 1242
The same mechanism as in the power steering 'lff1[ of the formula can be adopted.

Figures 8 and 9 show the relationship between the tie rod (35) and the inner cable (9) that operate on the driven part ('2J) shown in Figure 7.

A second opening groove (38) and a small guide groove (39) similar to the first opening groove <16) in FIG. 2 are formed in the tie rod (35). A cable end fitting (40) fixed to the other end of the inner cable (9) is locked near the end of the 21st FI1 opening groove (38).

An opening (41) is formed in the second casing (6), and the cable guide (2) shown in Fig. 2 is formed in the opening (41).
The tip of a cable guide (42) similar to that in Figure 0) is inserted. The cable guide (42) has a protrusion (4
3), a small protrusion (44), an inclined guide hole (45), a retainer (46) for fixing the outer casing (8), etc. are provided, respectively. Therefore, the inner cable (9) connects the second opening fi (38) and the second casing (
5) A passageway (48) formed by the inner wall surface (47) of
, inclined guide hole (45) and outer casing (8)
It is guided freely by a series of conduits, so that operating force can be transmitted in the push and pull directions.

Next, the operation of the apparatus of the present invention constructed as described above will be explained.

In FIG. 1, when the handle (11) is rotated in the direction of the arrow (Δ), the rack (12) is also displaced in the direction of the arrow (C). In the case of FIGS. 5 and 6, the pulley (28) or the internal gear (32) rotates in the direction of the arrow (A). As a result, the inner cable (9) is pushed out in the direction of arrow (G), and the tie rod (3) moves in the direction of arrow ([).

Therefore, the steering wheel (49) rotates in the direction of the arrow (K>). In this case, the power unit causes the tie rod (
35), auxiliary power is applied to the piston (37) in the direction of arrow (1).

Next, when rotating the handle (11) in the direction of the arrow (B), the inner cable (9)
is pulled in the direction of arrow (H), the tie rod (35) moves in the direction of arrow (J), and the steering wheel (49) rotates in the direction of arrow (B).

In the device of the present invention, an operating part (1) and a driven part (2)
Because the control cable (3) is connected to the control cable (3), the operating part (1) can be placed in any position or at any angle, regardless of the position or direction of the driven part (2). Can be set.

Therefore, even in automobiles such as forklifts where the steering wheel is the rear wheel, the operation part can be arranged at an angle that makes it easier for the driver to operate, making it easier to set up the steering wheel. It has the remarkable effect of easily reaching 4T.

In addition, since the operation part (1) and the driven part (2) can be installed separately on the vehicle body, ICs including their peripheral equipment can be installed separately.
The work of assembling the entire power steering device becomes significantly easier.

Furthermore, as shown in Fig. 1, Fig. 5, or Fig. 6, the length of the handle 'M (40) can be determined, thereby reducing the weight of the width weight lifting and the use of grooved structures such as shock absorbing handles. It has the distinct advantage of contributing to simplification.

Furthermore, since the operating section (2) of the present invention is directly connected to the inner cable (9) and tie rod (35), there is less backlash compared to the case of connection using a rack and vinyl A, which requires backlash. It has the advantage of having less

In addition, in the device of the present invention, when providing an inclined guide hole in the linear first casing or the second casing, the first
There is an advantage that space in the width direction is greatly saved compared to the case where the push/pull control cable is connected concentrically to the end of the casing or the second casing.

Summary-12 The power steering device of the present invention has many effects, and its practical value is extremely great.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view showing one embodiment of the device of the present invention, FIG. 2 is a sectional view taken along the line (X)-(X) of FIG. 1, and FIG.
FIG. 4 is an exploded perspective view of the main part of the operating section shown in FIG. 3, and FIGS. FIG. 7 is a longitudinal sectional view of essential parts showing one embodiment of the driven section in the device of the present invention, FIG. 8 is a partially enlarged view of FIG. 7, and FIG. The figure is a (Z>-(Z) cross-sectional view of Figure 8. (Main symbols in the drawing) (1): Operating section (2): Follower section (3): Control 1 - "Call cable (4)" , (27): 1st casing (5): 2nd casing (8): Arataf-sink (9): In-boot cape-pull (+0): Handle shaft <ii>: Handle <12) Nirakku <15): Vinyl A (1G), <29): First frontage groove (17): Inner wall surface <19): Inclined guide hole (2,'l): Pulley (30): Tangent guide hole <32),: Internal tooth inner surface <35) : Tilowa 1 ~ (3G) Niji cylinder (37) : Piston (38) : 2nd frontage groove (45) : Inclined guide hole (47) : Inner wall surface (49) : Steering wheel

Claims (1)

[Claims] 1. Rotation operation of a handle rotatably installed near the driver's seat! A power steering device for an automobile for transmitting a rotational operation of a steering wheel, the device comprising: (A) the handle, a handle shaft having one end fixed to the handle, and installed near the other end of the handle shaft; A first casing that is slidable and freely slidable in the first casing, and a first opening groove for inserting an inner cable is formed in a surface that contacts an inner wall surface of the first casing. a sliding member, the handle shaft and the sliding member are connected such that the sliding member slides within the first casing in response to rotational movement of the handle shaft; B) A second opening is connected to the steering wheel so as to rotate about a substantially perpendicular line with respect to the steering wheel, and a second opening is formed on the surface of the steering wheel to allow the other end of the inner cable to pass therethrough. a second casing having an inner wall surface in sliding contact with the surface of the tie rod and accommodating the tie rod so as to be slidable in the axial direction; and a power unit for providing auxiliary power to the sliding movement of the tie rod. (C) an inner cable having one end locked to the end of the first opening groove of the sliding member and the other end locked to the end of the second opening groove of the tie rod; A power steering device comprising a push/pull control cable having an outer casing for slidably guiding the cable from a first casing to a second casing. 2. An inclined guide hole is formed in the second casing from a portion to which the outer casing is fixed to the inner wall surface and is inclined with respect to one movement direction of the rod, and one end of the inclined guide hole is connected to the second frontage groove. A power steering device according to claim 1, which is opened inward. 3. The sliding member is a linear rack, and the first casing accommodates the rack so as to be slidable in a linear direction, and extends from a portion to which the outer casing is fixed to an inner wall surface in the sliding direction of the rack. 2. The power steering device according to claim 1, wherein an inclined guide hole is provided which is inclined with respect to the present invention, and one end of the inclined guide hole is opened into the first frontage groove. 4 The sliding member is a disc-shaped internal gear, and the first
A casing rotatably accommodates the internal gear, and
A power supply according to claim 1, wherein a tangential guide hole is formed in a tangential direction from a portion to which the outer casing is fixed to the inner wall surface, and one end of the tangential guide hole is opened in the first frontage groove. Steering device.