JPS58137533A - Method of making groove-type port in rotary control valve for flow rate - Google Patents

Abstract

PURPOSE:To attain high accuracy and productivity for a groove-type valve port, by using a rotary tool to provide a groove of a width less than the desired final width of the port and by thereafter using reciprocating grooving tool to cut both the side edges of the groove to provide the groove-type valve port of final width. CONSTITUTION:An end mill 100 is inserted into a valve sleeve 16 so that the end mill is inclined as to the axis of the sleeve. A groove A of a width T1 less than the desired final width T2 of a valve port groove is made by the rotary cutting action of the tip of the end mill 100. The position of the groove A in indexed by the indexing device of a tool head or a work table. Both the ends of the groove A are closed by the valve sleeve 16. A tool 101 provided with a tip 102 of a cutting edge width equal to the final width T2 is reciprocated to cut both the side edges of the groove A.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a groove-type pulp port for rotary flow rate control pulp, and particularly to a rotary flow rate control method used as a sea bream pulp in power steering devices of vehicles such as automobiles. Relates to a method of manufacturing a groove-type pulp boat for pulp production.

As one of the control pulps for power steering of medium-sized vehicles such as automobiles, a first pulp member having a hollow part with a circular cross section and having a plurality of groove-shaped pulp boats on the inner circumferential wall defined by the hollow part; , a second pulp member having a circular cross section fitted in the hollow portion and having a plurality of pulp boats on an outer peripheral wall; and a relative rotation between the first pulp member and the second pulp member. A rotary control valve has already been proposed in which the degree of polymerization of the two pulp boats corresponding to each other is controlled by displacement, and the flow rate of hydraulic oil flowing through the two valve boats is controlled.

In a power steering device, as the flow rate of hydraulic oil flowing from the oil pump through the above-mentioned control pulp into the -h cylinder chamber of the power steering slow-acting cylinder device increases, the assist that acts on the steering device increases. The control valve responds to the driver's steering operation, and when the steering is in a neutral (straight ahead) state, the cylinder is turned off. The flow rate of the hydraulic oil flowing into the chamber is set to zero so that the cylinder device does not generate an assist force, and when the steering changes from the neutral position to the right or the turning state, the hydraulic oil is supplied to the cylinder chamber so that the cylinder device ll1j is controlled so that the device generates an assisting force.

By the way, in the above-mentioned control valve, since the flow rate is controlled by the degree of polymerization of the valve boats provided in the first and second pulp members, the arrangement position of the valve boats is The relative rotational displacement between the member and the second pulp member has a large effect on the W & Eel control characteristics, and for this reason, if the valve boat is not properly positioned, the desired flow control characteristics may not be achieved. is not obtained, and will be explained later (
It is not possible to perform an appropriate switching function such as f4#.

In the control of hydraulic oil flow in the bower soot ring device, the opening characteristics of the pulp 1 at the start and end of the pulp opening and closing are particularly important on both sides of the valve boat in the direction of valve rotation. Therefore, if the opening edge is not set in the correct position, the characteristics of the valve #1m at the beginning and end of pulp opening and closing will vary, causing It is not possible to obtain good quality pulp properties at this stage.

Generally, the valve boat installed in the first valve part 44 of the control valve as described above is configured as a groove-shaped pulp boat extending in the direction of its axis, and the inner edge of the groove and the valve boat The inner circumferential direction of the first valve part I and the position of the corner (opening edge) keep the glaze in the ＾柚瓜] as the addition method of the square suffin hole and lc, 14! A 1/LLI-chi processing method by chain-making is conventionally known. Forming the valve boat groove by 10-chi machining can guarantee groove position accuracy. Since the groove is opened at the end of the pulp member, it is necessary to attach an annular plug member to the end of the pulp member in order to close the groove end. This plug member is generally identified to the pulp member by press-fitting, but the press-fitting part between the pulp member and the plug member requires precision finishing by grinding etc. in order to ensure liquid tightness at a relatively high pressure. In the production of large trowels, it is extremely difficult to ensure that the press-in part is securely inspected by the metal cabinet. For this reason, the pulp boat groove as described above is generally formed by cutting with a rotary blade tool such as a milling cutter, leaving both ends of the pulp member intact. However, in this case, the cross-sectional shape of the valve boat groove becomes a semicircle or a similar shape, making it difficult to control the width of the groove.
^1ili [I can't wait for Mizoka ■.

The invention number is MG
In view of the above-mentioned problems, the purpose of this project is to provide an IC groove type pallet 1 bow 1 jaw removal method that is easy to use and has excellent productivity.

According to the present invention, the above-mentioned (c) method for forming a groove-type pulp boat in a rolling-type flow-trowel controlled pulp, in which a groove of a groove ring smaller than the final required width is formed by a tool. Then, both side edges of the groove are cut by cutting with a reciprocating type groove cutting tool, thereby achieving the method of manufacturing a groove-type pulp boat having the groove width of the final required width.

The invention will now be described in detail by way of example embodiments with reference to the accompanying drawings.

FIG. 1 shows Example-9 in which a rotary AM control pulp containing a groove-type pulp boat obtained by the production method according to the present invention was actually discussed as a control pulp for a power steering device. ＃IIi Location map, Figure 2 is smaller than Figure 1 ICυ''-
An enlarged side view of Pal 1, FIG. 3, is shown in FIG. 1, and 1. :I1II is an enlarged plan view showing the number installed on the pallet 1 of the groove-type pallet boat. In these figures, 1 is the Pal 1 Cousing of the JIII Hull 1 for the Bassauce TI ring device, 2 is the small GI X7 Cousing of the Sufu-1 Link T~, and 4 is the Pulp Casing 1. A cylindrical main shaft 5 is supported by a bearing 3 so as to be freely rotatable. main shaft 5
Its lower half is inserted into the cylindrical hollow part 4 of the pulp casing 1, and is connected to a steering link main shaft (not shown) by a spline 6 provided on the outer periphery of the upper end, and is rotationally driven by a steering wheel. It is now possible to do so. A torsion bar 7 is inserted into the main shaft 5, and this torsion bar 7
is connected to the upper end of the main shaft 5 by a pin 8 at its upper end.

The gear casing 2 is connected to the pinion 1 by bearings 9 and 10.
1 is rotatably supported on the same axis as the main shaft 5. The pinion 11 rotatably receives the lower end of the main shaft 5 at a cylindrical hub portion 12 provided at its upper end, and is connected to the lower end of the torsion bar 7 by a pin 13 . Gear casing 2 creeping taper 1
4 is supported so as to be able to reciprocate in its axial direction, and the rack bar is engaged with the binion 11 at a rack 15, so that it is moved by one movement in the axial direction as the binion 11 rotates. The rack bar 14 is selectively supplemented with driving force in its axial direction by a power steering cylinder eta (not shown) which is well known in the art.

A pulp sleeve 16 is provided within the conical hollow portion 4 of the pulp casing 1 . This pulp sleeve 16 is adapted to fit into the inner circumferential surface of the hook-shaped hollow portion 4 at its outer circumferential surface, and to fit into the outer circumferential direction of the main shaft 5 at its inner circumferential direction. The pulp sleeve 16 is also connected to the hub portion 12 of the binion 11 by a bin 17. Six pulp boat grooves 18 to 18 are formed on the inner peripheral wall of the pulp sleeve 16.
23 are provided. These pulp boat grooves are provided extending in the axial direction of the pulp sleeve 16, leaving both ends of the pulp sleeve 16 open. As clearly shown in FIG. 2, the pulp boat grooves 18 to 23 are provided at predetermined circumferential positions of the pulp sleeve 16 and spaced apart from each other. That is, the pulp boat grooves 18 and 19, the pulp boat grooves 20 and 21, and the pulp boat grooves 22 and 23 are located at symmetrical positions with respect to the center point of the pulp sleeve 16, and the pulp boat grooves 20 and 22 are The pulp boat grooves 21 and 23 are equally spaced apart from each other on both sides of the pulp boat groove 18, and the pulp boat grooves 21 and 23 are equally spaced apart from each other on both sides of the pulp boat 119.

The pulp boats 118 and 19 communicate with an annular groove 28 formed on the outer periphery of the pulp sleeve 16 through oil holes 26 and 27, respectively, and this annular groove 28 further communicates with an oil hole 29 provided in the pulp casing 1 and an oil hole 29 provided in the pulp casing 1. 1 to an oil pump of a power steering device (not shown). Pulp boat groove 2
0 and 21 communicate with an annular groove 33 formed on the outer periphery of the pulp sleeve through oil holes 31 and 32, respectively, and this annular groove 33 further communicates with an oil hole 34 provided in the pulp casing 1 and an oil hole 34 provided in the pulp casing 1. Connected guide! ! 35 to one cylinder chamber of a power steering cylinder device (not shown). The pulp boat grooves 22 and 23 also communicate through oil holes 36 and 37, respectively, with an annular groove 38 provided on the outer periphery of the cough pulp sleeve 16, and this annular groove 38 further communicates with an oil hole 39 provided in the pulp casing 1. It is connected to the other cylinder chamber of the cylindrical cylinder device via a conduit 40 connected to the pulp casing 1.

Four pulp boat grooves 41 to 44 are provided on the outer circumferential wall of the portion where the main shaft 5 fits into the pulp sleeve 16 so as to be diagonal to each other at equal corners.

These pulp boat grooves 41 to 44 are configured as substantially rectangular recesses having a substantially rectangular cross section, and in the initial position 1 when no torsion force is acting on the torsion bar 7,
The pulp boat groove 41 corresponds to the pulp boat groove 18, the pulp boat groove 43 corresponds to the pulp boat groove 19, and the pulp boat groove 42 corresponds to the general circle @ff116a between the pulp boats 120 and 23 of the pulp sleeve 16. Further, the pulp boat groove 44 corresponds to the general inner part 84Iiii16a of the pulp boat grooves 21 and 22, respectively, and the pulp boat grooves 42 and 44 respectively correspond to the oil hole 45. It communicates with the hollow portion 5a of the main shaft 5 via 46. The hollow part 5a is connected to the cylindrical hollow part 4 through an oil hole 47 provided in the main shaft 5.
This upper space is connected to an oil tank (not shown) via an oil hole 48 formed in the pulp casing 1 and a drain conduit 49 connected to the pulp casing 1.

Two ridged portions 50.51 are provided on both sides of each of the pulp boats 41 to 44 in the same manner as each other. The chamfer 50 is continuous at one edge with the opening edge of each pulp boat groove, and at the other edge is continuous with one edge of another chamfer 51, and the chamfer 51 is continuous with the opening edge of each pulp boat groove at the other edge. The cutout portions 50 and 51 are continuous in the general circumferential direction 5b of the main shaft 5 at one edge thereof, and the cutout portions 50 and 51 have a ridge line 5 at their joint edge.
2, and the chamfered portion 51 forms another ridgeline 53 at the joining edge with the general circumference 1i5b of the main shaft 5.

In the control pulp configured as described above, rotational force acts on the main shaft 5 as the steering wheel rotates, and this drives the pinion 11 via the torsion bar 7, and when the rack par 14 is moved, the skewer of the vehicle is The torsion bar 7 is twisted due to the rotational resistance from the shaft, and in response to the twisting force, a relative one-turn position occurs between the main shaft 5 and the pulp sleeve 16, and an oil passage corresponding to the relative rotational displacement occurs. switching and l1m control are performed, and assist force is generated in the power steering cylinder device according to the required steering operation force.

That is, when the steering wheel is in the neutral position and the torsion bar 7 is not twisted, the main shaft 5 and the pulp sleeve 16 are in a relative position as shown in FIG. The orifice portion formed by both sides of the pulp boat grooves 20 to 23 and the side opening edges of the pulp boat grooves 20 to 23 are all in an open shape S. Therefore, at this time, lead from the oil pump! 30, oil passage 29, annular groove 2
8 and oil channel 26.27 to pulp boat groove 18.19
The high-pressure hydraulic oil supplied to the cylindrical hollow part 4 flows into the pulp boat groove 42 or 44 through the oryswiss parts, and further flows through the oil passages 45, 46, the hollow part 5a1, the oil passage 47, and the upper part of the cylindrical hollow part 4-1. The oil flows to the oil tank via the oil passage 48 and the drain oil passage 49, so that no substantial working oil is supplied to any cylinder chamber of the power steering cylinder device.

At this time, the cylinder chamber i! The stomach does not generate any assisting force.

For example, when the steering wheel is rotated to the right in order to make a right turn from the neutral state as described above, and the main shaft 5 is accordingly rotated in the clockwise direction as seen in FIG. Accordingly, a relative rotational displacement occurs between the main shaft 5 and the pulp sleeve 16, and the main shaft 5 is rotated relative to the pulp sleeve 16 in the clockwise direction as viewed in FIG.

Due to this relative rotational displacement, the orifice part of the cabinet between the pulp boat groove 41 and the pulp boat groove 20, the pulp boat groove 42
The orifice part of the cabinet between the pulp boat groove 23, the orifice part of the cabinet between the pulp boat 1143 and the pulp boat groove 21, and the - between the pulp boat groove 44 and the pulp boat groove 22.
The degree of opening of the oriswiss part has increased, and this and w4w
7II, an orifice portion between the pulp boat groove 41 and the pulp boat groove 22, an orifice portion between the pulp boat groove 42 and the pulp boat groove 20, an orifice portion between the pulp boat groove 43 and the pulp boat groove 23, The degree of opening of the orifice portion between the pulp boat groove 44 and the pulp boat groove 21 is reduced. This allows the pulp boat groove 18.1
The high pressure hydraulic oil supplied to 9 flows to the pulp boat 1m 120 or 21 through its enlarged orifice,
From this, the oil passage 31 flows into one cylinder chamber of the cylinder device through 32, the annular groove 33, the oil hole 34, the conduit 3, etc., and the hydraulic oil in the other cylinder chamber of this cylinder device flows into 1140. The oil flows through the oil hole 39, the annular groove 38, the oil hole 36, 37, and the orifice section enlarged from the valve boat groove 22 or 23 to the pulp boat groove 42 or 44, where it is drained. As a result, the cylinder device generates an assist force in the right turning direction.

The degree of generation of this assist force depends on the amount of hydraulic oil flowing into the cylinder chamber. The flow rate of this hydraulic oil is 6L due to the relative rotation between the main shaft 5 and the pulp sleeve 16.
In particular, the flow rate control characteristics at the start and end of pulp opening/closing are determined by the size, inner length,
It is determined by the relative positions, the groove widths of the pulp boat grooves 18 to 23, and the relative positions of the opening edges on both sides.

FIG. 4 shows the required steering force to obtain the desired steering feeling.

In this figure, N indicates the neutral position, E indicates the final turning position in the right turning direction, and El indicates the final turning position in the left turning direction. A' and AL are determined by the relative positions of the ridge lines 52 provided on both sides of each of the pulp boat grooves 41 to 44 and the side opening edges of the pulp boat grooves 18 to 23; 8L is determined by the relative position between the ridge line 53 and the side opening edges of the pulp boat grooves 18 to 23. Therefore, if the relative position as described above is not maintained at the edge of the shaft, the steering characteristic line as described above will not be achieved. The transition points on the left and right sides vary, and the positions of the transition points are not symmetrical on the left side, making it impossible to obtain a symmetrical steering feel.

Next, a method for manufacturing the pulp boats 1m118-23 formed in the inner circumferential direction of the pulp sleeve 16 will be described with reference to FIGS. 5 to 8. In the manufacturing method according to the present invention, as shown in FIG.
is inserted into the inner part of the pulp sleeve 16 at an angle with respect to the axis of the pulp sleeve 16, and a groove IIIA having a groove width T+ smaller than the final required width T2 of the pulp boat groove is formed at the tip of the end mill 100 by rotary cutting. Groove A obtained by rotary cutting
As shown in FIG. 6, the cross-sectional shape is approximately semicircular, and the groove width T+ at the edge of the opening is a predetermined amount smaller than the final required width 1"!".

This groove A is provided in each of the pulp boat grooves 18 to 23, and the indexing of the multi-groove A is determined by the indexing of the tool head (not shown) that holds the nod mill 100 or the work table that holds the pulp sleeve 16. It should be done by @stomach. This groove A is provided so that both ends of the pulp sleeve 16 are closed by the pulp sleeve 16 itself, leaving both ends of the pulp sleeve 16 open. In addition, this full processing is not limited to cutting with a rotary blade tool such as an end mill,
It may be performed by cutting with another cutting tool or by plastic working such as rolling.

After completing the machining of the groove A as described above, as shown in FIG.
Both side edges of groove A are removed by cutting I#b. As a result, as shown in FIGS. 3 and 8, the opening edge of this pulp boat groove can be
The corner C that joins the corner C is provided by the cutout B, and its position 11 marks depend on cutting by the cutting tool 103. The groove machining width with the cutting tool 103 depends on the blade width, the horizontal feed of the cutting tool, and the most common processing method.
Since machining of m degrees is guaranteed, the positional accuracy of the corner C can be guaranteed to be highly accurate without using a special processing machine.

As mentioned above, the positional accuracy of the corner (-〇 edge) of the pulp boat groove can be maintained with high precision using a general processing method, and pulp can be processed without using special processing methods that are not suitable for eel production. The pulp characteristics at the start and end of opening and closing can be made highly accurate without having large variations compared to the desired pulp characteristics, and the desired symmetrical steering feeling can be obtained. You will be able to do this.

In addition, forward cutting with a tool such as a cutting tool may be shallower than the bottom of the groove A previously obtained by rotary cutting, etc., thereby ensuring a place for the chips generated during forward cutting with a cutting tool to escape. Since the cutting can be carried out with relatively small cutting forces, there is no need for large rigidity of the tool or its holding device. The cutting process can be completed during the mourning period, and this process does not significantly impair the productivity of the soap.

In addition, since parallel sides 10 are formed on both sides of the pulp boat groove by the cutout part B, it becomes possible to measure the two-dimensional length of the pulp boat groove, and the dimension inspection of the groove width of the valve boat groove can be carried out. It becomes easy to do.

Although the present invention has been described in detail above with reference to specific embodiments, the present invention is not limited thereto, and it will be appreciated that various embodiments may be made within the scope of the present invention. This will be cheerful for business owners.

[Brief explanation of the drawing]

Fig. 1 shows an example in which a rotary flow rate control pulp including a groove-type pulp boat formed by a manufacturing method according to the present invention is used as a power steering @ pupil control pulp. 3 is an enlarged cross-sectional view showing the main part of the am pulp shown in FIG. 1, FIG. 3 is an enlarged plan view showing one of the pulp boats installed in the control pulp shown in FIG. 1, and FIG. The figure is a microcosm showing the general steering operation characteristics required for steering for spit shafts, and Figures 5 to 8 are diagrams showing the manufacturing process of the groove type pulp boat according to the present invention, of which Figure 16 is ImV-V& in Figure 5
-1-5JE large*ms, 18[t171 IlmVI-
It is an enlarged lIi direction view along v■. 1...Pulp casing, 2...Gear casing. 3...-Bearing, 4...Hook-shaped hollow part, 5...Main seat w7, 6...Spline, 7...Torsion bar, 8...Bin, 9.10...Bearing , 11... Binion, 12... Hub portion, 13... Bin, 14-...
- Rack bar 115...Rack, 16...Pulp sleeve, 17...Bin, 18-23...Valve boat groove, 26.27...Oil hole. 28 ・III-shaped 111.29-・oil hole, 30・J
IFF, 31. 32... Oil hole, 33... Annular groove, 34... Oil hole,
35... Conduit, 36. 37... Oil hole, 38... Annular groove, 39... Oil hole, 40... Conduit, 41-44.
...Valve boat groove. 45-48...Oil hole, 49...Drain conduit, 50.
51... Thinning part, 52', 53... Horizontal line, 100
...■Nodomil. 101... part-time job, 1o2...
Blade tip, A...groove, 8...cutting part, C...corner (opening edge), D...side wall Patent applicant Toyota Automatic Kushi Industries Co., Ltd.
Patent Attorney Akishi Lu Takeshi Figure 1 Figure 4 Figure 5 Figure 7 Figure 6

Claims (1)

[Claims] a first pulp member having a hollow part in a circular Ii plane and having at least one groove-shaped pulp boat extending in the direction of its axis on an inner circumferential wall defining a cough hollow part; a second pulp member having a circular cross section and having at least one pulp boat on an outer peripheral wall; A method for manufacturing a groove-type pulp boat in rotary flow rate control pulp, in which the degree of polymerization of both valve boats is controlled to control the flow rate of fluid flowing through the two valve boats, A method of forming a groove with a small groove width, and then cutting both side edges of the groove by cutting with a reciprocating groove cutting tool to produce a groove-type pulp boat having a groove width of the final required width.