JPS60131369A - Cylinder device for power steering mechanism - Google Patents

Abstract

PURPOSE:To remove residual air in clinder device easily by making a communication hole opening above the cylinder body and a hole to be connected with piping on the axis inclining against the central axis of boss. CONSTITUTION:A connection hole 24, communication hole 25 and supply/discharge hole 26 are made in a boss 21 and cylinder body 20. Said holes 24, 25, 26 are inclined against the central axis L1 of boss 21 to be opened above the cylinder body 20 when welded to the cylinder body 20. Consequently, upward projection of fastening nut to be screwed into said hole 24 and the pipe 31 to be secured through said nut 30 is reduced resulting in prevention of interference with an oil pan 18.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a cylinder device used for power assistance of a power steering device, and particularly to a cylinder device used in a rank and pinion type power steering device.

<Prior art> In general, in such a cylinder device, the cylinder device integrated with the servo valve device is installed in a horizontal state on a support frame arranged and installed at the bottom of the engine compartment of the automobile, and then
Piping between the pump unit and the pump unit is performed, but in this state, air remains inside the cylinder device, so it is necessary to bleed out the air in some way.

In order to make this air removal easy, the supply and discharge holes of the cylinder device are formed at the top of the cylinder body.
Pressure oil can be supplied and discharged from above the cylinder device, but in a cylinder device where a cylindrical pipe is used as the cylinder body and a cylindrical boss is welded to the cylinder body as a pipe attachment part, Because the pipe mounting part of the boss faces upward, the vicinity of the cylinder device mounting side of the piping that communicates between the cylinder body and the servo valve device extends considerably upwards with respect to the cylinder body. If the engine is located above the cylinder body, there is a problem that the engine may interfere with an oil pan or the like mounted below the engine.

<Object of the Invention> The present invention has been made in view of these conventional problems, and it can be installed even when there is no large space above the cylinder body, and the air remaining in the cylinder body can be easily removed. It is an object of the present invention to provide a cylinder device for a power steering device with a simple structure that can be removed.

<Structure of the Invention> In order to achieve the object of darning, the present invention fixes a boss on the outer periphery of a cylinder body so that its center axis coincides with the diameter line of the cylinder body, and one end of the boss is attached to the cylinder body. A communication hole opening upward and a connection hole for connecting a piping pipe are formed on an inclined axis inclined to the central axis of the boss.

<Example> Embodiments of the present invention will be described below based on the drawings.

In FIG. 1, reference numeral 10 denotes a rank-and-pinion type power steering device, and this power steering device 10 is connected to the vehicle by a pair of support bands 12, 12 so that the axis of the cylinder device II is horizontal. It is mounted on the mounting frame 13 of. A pair of rotors 15.15 are connected via universal joints to both ends of a rank shaft passing through the cylinder device 11 in the axial direction, and are connected to the concave knuckle arms.

At the right end of the cylinder device 11, the input shaft has a concave path iI.
A servo valve device 16 connected to the handle via a joint and a universal joint is integrally attached, and a pair of piping pipes 17 and 17 communicate between the servo valve device 1G and the cylinder device 11. , hydraulic oil is allowed to flow. Furthermore, after the power steering device 10 is attached to the frame 13, the servo valve device 16 is communicated with a concave pump unit disposed above the power steering device 10 through a piping. There is.

Note that 18 is an oil pan attached to the bottom of the engine.

Next, to explain the structure of the piping pipe attachment part in the cylinder device 11, which is a feature of the present invention, the cylinder body 2o of the cylinder device 11 is constituted by a cylindrical pipe. A mounting boss 21°21 is welded.

That is, this boss 21.21 is a cylinder having an arcuate mounting surface 22 formed at one end of the cylinder centered on the central axis L1, and a flat notch 23 formed at the other end, as shown in FIGS. 2 to 4. The curved boss 21.21 is attached to the outer periphery of the cylinder body 2o by its arcuate mounting surface 22 so that its center axis L1 coincides with the diameter line of the cylinder body 2o diagonally above the axis of the cylinder body 2o. is welded to.

The boss 21.21 and the cylinder body 20 have connection holes 24. A communication hole 25 and a supply/discharge hole 26 are bored. The connection hole 24, the communication hole 25 and the supply/discharge hole 2
6 is formed to be inclined with respect to the central axis L1 of the boss 21.21 so as to open above the cylinder body 2o when it is welded to the cylinder body 2o.

Due to this inclination, the amount of upward protrusion of the tightening nut 30 screwed into the connection hole 24 and the pipe 31 fixed by the tightening nut 30 is small, and interference with the oil pan 1 is prevented.

Note that 28 indicates a sheet member that engages with a portion of the flare formed at the tip of the pipe, and a portion of the flare of the pipe 31 is held between the sheet member 28 and the sleeve 30.

Welding of the bosses 21.21 is performed by projection welding. In this case, as shown in FIG.
1 is positioned on the cylinder body 20 placed on the support block 36 so that its central axis L1 faces in the vertical direction. Then, by lowering the upper electrode 35 and applying a predetermined pressing force, and applying a predetermined voltage between the upper electrode 35 and the support block 36 as the lower electrode in this state,
The arcuate mounting surface 22 of the boss 210 is melted by Joule heat, and the boss 21 is welded to the outer periphery of the cylinder body 20. At this time, pressing force can be applied to the boss 21 in the direction of the center axis LL force, that is, in the diametrical direction of the cylinder body 20, so the boss 21 may become misaligned during welding work, or the cylinder body 20 may rotate. There is no risk of damage (and the welding work can be carried out reliably).

Further, the connecting hole 24, the communicating hole 25, and the supply/discharge hole 26 are machined so that the axis L2 of the connecting hole 24.25 is oriented vertically as shown in FIG.
1.21 is positioned on the support block 38, and the drill tool 38 or tap tool can be lowered from above to easily process the tool.

In the cylinder device configured as described above, since the boss 21, the tightening nut 30, and the vibrator 31 are oriented substantially horizontally, the piping bypasser does not interfere with the oil pan 18 located above the cylinder device 11. Since the supply/discharge hole 26 can be provided near the top, air remaining in the cylinder body can be easily removed.

That is, in order to bleed air, the power steering device 10 is attached to the automobile, and after the piping is connected to the pump unit,
This is done by removing air using a vacuum pump or the like, and then supplying and discharging hydraulic oil, but in this state, air remains inside the cylinder. To remove this air, operate the pump to supply pressurized oil, and in this state rotate the steering wheel left and right several times to the end of the stroke.This will cause the piston in the cylinder device to move from the neutral position to the left side. The piston moves repeatedly to the right stroke end, thereby discharging the air in the cylinder device 11 from the supply/discharge boat.At the piston stroke end, the universal joint attached to the end of the rank shaft Because it is in the position where it engages with the locking surface, there is a considerable gap between the piston in the cylinder device and the inner surface of the end of the cylinder, and air remains in this gap. The air discharged from the supply and discharge hole 26 is discharged through the pipe 31.
31 and the servo-valve arrangement 16 to the hydraulic tank of the pump unit, from where it is discharged to the atmosphere.

<Effects of the Invention> As described above, in the present invention, a boss is fixed to the outer periphery of a cylinder body so that its center axis coincides with the diameter line of the cylinder body, and one end of the boss is fixed to the outer periphery of the cylinder body. The communication hole that opens upward and the connection hole that connects the piping vibrator are formed on an inclined axis that is oblique to the central axis of this boss, so even if there is an oil pan or the like near the top of the cylinder device. There is an advantage that the supply/discharge hole can be formed near the top of the cylinder device, and air remaining in the cylinder device can be easily removed.

Furthermore, since the connection hole and the communication hole are formed on the same axis, the mating hole can be machined at the same time, which has the advantage that the process is easy and the shape of the boss can be simplified.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG.
An external view showing the installed state of the and-binion type power steering device, Figure 2 is an enlarged cross-sectional view taken along the ■-n line in Figure 1, and Figure 3 is a cross-sectional view taken along the mm-m line in Figure 2. 4 is a sectional view taken along the line IV-IV in FIG. 3, FIG. 5 is a diagram showing the state when the boss is welded, and FIG. 6 is a diagram showing the processing state of the boss. 10... Power steering device, 11... cylinder device, 2
0... Cylinder body, 21... Hoss, 24... Connection hole, 25... Communication hole, Ll... Center axis line, L2...
...Inclination axis. Patent applicant: Toyoda Machine Tool Co., Ltd. Figure 6

Claims (1)

[Claims] ill In a cylinder device for a power steering system in which a cylindrical cylinder body into which a piston is fitted is mounted horizontally on a vehicle, a boss is provided on the outer periphery of the cylinder body so that its center axis is the diameter line of the cylinder body. The boss is provided with a communication hole whose one end opens above the cylinder body and a connection hole for connecting a piping pipe on an inclined axis that is inclined to the central axis of the boss. Characteristic cylinder device for power steering device.