JP3048932B2 - Master cylinder with reservoir - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a master cylinder provided with a reservoir, and more particularly to a master cylinder having a reservoir and a cylinder body which are assembled with two bosses formed at the same height. The present invention relates to a master cylinder in which a main body and a main cylinder are inclined with respect to each other.

[0002]

2. Description of the Related Art Japanese Patent Laid-Open No.
Japanese Patent Application Publication No. 11702 discloses a master cylinder provided with this conventional reservoir.

FIG. 5 shows a conventional master cylinder, which is indicated by 101 as a whole. First and second pistons 105 and 106 are slidably fitted in a cylinder hole 104 formed inside the cylinder body 102, and the first and second hydraulic pressures are formed by these two pistons 105 and 106. Chambers 107 and 108 are defined. Further, two bosses 109 and 110 project from the outer periphery of the cylinder body 102 to the same height, respectively.
Two nipple portions 111 and 112 of the reservoir 103 are fitted into recesses 113 and 114 formed in the components 9 and 110 via grommet seals 115 and 116 as sealing members. The recesses 113 and 114 are in the liquid supply holes 1 respectively.
First and second hydraulic chambers 107 and 108 via 23 and 124
The hydraulic fluid stored in the reservoir 103 is supplied to the two hydraulic chambers 107 and 108 from here. In addition, a cap 120 is attached via a seal member 122 to an inlet 121 for injecting the working fluid formed above the reservoir 103. Further, as is well known, the interior of the reservoir 103 can communicate with the outside air through a slit 122a formed in the center of the seal member 122 and a communication hole (not shown) formed in the cap 120. This keeps the inside of the reservoir 103 at atmospheric pressure.

Further, a convex portion 118 is formed on the outer periphery of the cylinder body 102 so as to project toward the bottom of the reservoir 103, while the convex portion 118 is formed on the bottom of the reservoir 103.
A pair of flange portions 117 (only one flange portion is shown) are formed so as to sandwich the protrusion 8, and the convex portion 118 and the flange portion 117 are connected by a single connecting member 119.

[0005] The conventional master cylinder 101 constructed as described above is assembled such that the axis of the cylinder body 102 and the central axis of the reservoir 103 are inclined at a predetermined angle as shown in the figure. When it is mounted, it is rotated clockwise from the state shown in the figure by the predetermined angle so that the reservoir 103 is horizontal (so that the level of the hydraulic fluid inside the reservoir 103 is horizontal). It has become.

[0006]

However, in the conventional master cylinder 101, the recesses 113 formed in the two boss portions 109 and 110 of the cylinder body 102 are not provided.
114 have the same shape, and the nipple portions 111 and 112 of the reservoir 103 that fit into the recesses 113 and 114 are also of the same shape. May be incorrectly assembled. That is, one nipple portion 111 is in the recess 114 and the other nipple portion 1
12 may be fitted into the recess 113, and the reservoir 103 may be erroneously assembled in a direction rotated 180 degrees with respect to the vertical line from the state shown in the figure. When the master cylinder in which the reservoir 103 is assembled to the cylinder main body 102 by mistake is attached to the vehicle, the reservoir 103 does not become horizontal when the vehicle is attached, but becomes more inclined.

At this time, if the amount of the hydraulic fluid stored in the reservoir 103 is at the highest level, the fluid level becomes
3, the sealing member 12 may be used depending on the vibration during the running of the vehicle or the parking or stopping of the vehicle on a steep slope.
The hydraulic fluid may leak from the cap 120 through the second slit 122a. If the amount of the hydraulic fluid is at the minimum level, the air in the reservoir 103 may enter the cylinder hole 104 depending on the vibration during the running of the vehicle or the stopped state of the vehicle, and the function of the master cylinder 101 may be reduced. It may cause trouble.

The present invention has been made in view of the above-described problems, and has as its object to provide a master cylinder having a reservoir that is not erroneously assembled when the cylinder body and the reservoir are assembled.

[0009]

The above object is achieved by a cylinder body having a cylinder hole formed therein, two bosses projecting at the same height from the outer periphery of the cylinder body,
A recess formed in the boss portion and connected to the cylinder hole, and a reservoir formed with two nipple portions facing the boss portion of the cylinder body and fitted in the recesses via a sealing member. This reservoir has a specific orientation
Serial is assembled to the cylinder body, the cylinder body, the axis of the cylinder body is inclined relative to the horizontal line by the vehicle mounted state, coincides with the central axis vertical line in the vehicle mounted state of the cylinder body of the reservoir in the master cylinder having a reservoir which is inclined relative to the axis of the cylinder body so as to, prior to the outer periphery of the cylinder body
A protrusion that projects in the same direction as the boss portion and toward the reservoir side.
The same direction as the boss from the bottom of the reservoir
And a projection protruding toward the cylinder body side,
Equally divide the distance between the axes of both bosses, and
Extending perpendicular to the axis in the same direction as the axis of the two bosses, etc.
They are formed opposite to each other at symmetrical positions
The projecting height of each of the projecting portion and the projecting body is
Smaller than the distance between the cylinder body and the bottom of the reservoir
And the height of each of the protrusions and the protrusions
The sum is the distance between the cylinder body and the bottom of the reservoir.
The protrusion and the protrusion
And interfere with each other, so that the specific orientation of the reservoir
A master cylinder provided with a reservoir, characterized in that assembly with the cylinder body other than the above is prevented .

When the orientation of the reservoir with respect to the cylinder body is proper, the reservoir and the cylinder body can be assembled without the projection on the cylinder body side and the projection on the reservoir side coming into contact with each other. If an attempt is made to assemble the cylinder body with the direction of the reservoir reversed, the projections and the projections abut against each other, which hinders the assembly of the reservoir and the cylinder body. This allows
Misassembly of the reservoir and the cylinder body can be reliably prevented.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The positions of the above-mentioned projections and projections are determined by equally dividing the distance between the axes of the two bosses of the cylinder body and orthogonal to the axis of the cylinder body.
The protrusions and the protrusions are formed at positions symmetrical with respect to a dividing line extending in the same direction as the above. For example, it may be formed at a position along the axial direction of the cylinder main body or at a position along a direction perpendicular to the axial direction. More than pairs are possible.

A projection projecting from the cylinder body toward the bottom of the reservoir; and a flange projecting from the reservoir toward the cylinder body and formed to overlap the projection. In the master cylinder of the type in which the cylinder body and the reservoir are coupled by inserting the coupling member into
If the protruding portion and the protruding body are further formed, the number of components to be protruded increases. Therefore, the convex portion is formed as the projecting portion to use both, or the flange portion is formed as the projecting body to use both, or the projecting portion is the projecting portion and the flange portion is the projecting portion. By forming the projection as a body, the projection and the projection also serve as a flange, and as the flange as a projection, the number of parts to be projected can be reduced.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a master cylinder according to an embodiment of the present invention, which is indicated generally at 21. A cylinder hole 26 having one end opening is formed inside the cylinder body 25, and a boss portion 27 having recesses 29 and 30 for connecting the reservoir 24 on the outer periphery of the cylinder body 25,
28 are formed to protrude at the same height. Cylinder hole 26
A first piston 31 and a second piston 32 are fitted with cup seals 33, 34 and 35, 36, respectively, and are slidably fitted therein. A return spring 39 is provided between the first piston 31 and the cup-shaped retainer 38.
The first piston 31 is moved by the spring force.
The head of the bolt member 37 screwed into the hole is engaged with a hole formed in the bottom of the retainer 38. A return spring 42 is stretched between the second piston 32 and the bottom of the cylinder hole 26, and urges the second piston 32 to the opening side of the cylinder hole 26, that is, rightward in the drawing. . The first piston 31, the second piston 32, the second
The first hydraulic chamber 40 and the second hydraulic chamber 41 are defined by the piston 32 and the bottom of the cylinder hole 26, respectively.

A valve device 43 is provided at the left end of the second piston 32 in the drawing. Since this has a known structure, its detailed description is omitted. However, when the brake is not operated, that is, in the state shown in the drawing, the end of the valve rod 44 provided integrally with the valve body 46 contacts the valve opening member 45. When the brake is operated, the second piston 32 moves to the left in the drawing, and the valve body 46 is seated on the valve seat 47 by the spring force of the valve spring 48 to close the valve. Has become. At this time, the hydraulic pressures generated in the first and second hydraulic pressure generating chambers 40 and 41 respectively correspond to the communication holes 8.
1 (see FIG. 2) and 80 are supplied to the wheel cylinders via a conduit (not shown) connected to 80.

A cap 5 is provided above the reservoir 24 with a sealing member 55 having a slit 55a at the center.
The nipples 58 and 59 connected to the recesses 29 and 30 of the bosses 27 and 28 are formed below the reservoir 24. These nipple portions 58, 59 are fitted with recesses 29, 30 by attaching grommet seals 60, 61 as sealing members to the outer periphery, respectively. One of the recesses 30 communicates with the first hydraulic chamber 40 via the fluid supply hole 50, and the other recess 29 communicates with the second hydraulic chamber 40 via a gap 51 between the cylinder body 25 and the valve opening member 45. The hydraulic chamber 41 communicates with the hydraulic chamber 41, from which the working fluid stored in the reservoir 24 is supplied to the hydraulic chambers 40 and 41.

The master cylinder 21 according to the present embodiment has a connecting portion J for connecting the cylinder main body 25 and the reservoir 24 by a connecting member 64 as shown in FIG. A convex portion 63 projecting from the cylinder body 25 toward the bottom of the reservoir 24 in the same direction as the boss portions 27 and 28 ;
It has a pair of flanges 62a, 62b projecting from the bottom of the reservoir 24 toward the cylinder body 25 and formed so as to overlap with the projection 63, and divides the distance between the axes of the bosses 27, 28 equally. And cylinder body 25
At right angles to the axis of the bosses 27 and 28
By inserting the coupling member 64 such as a spring pin into the hole 67 and the through holes 68a and 68b formed on the extending straight line P (see FIG. 1),
The cylinder body 25 and the reservoir 24 are connected. An insertion port 66 having a conical guide portion is formed in one of the flange portions 62b, and the diameter of the hole 67 of the projection 63 is expanded to a predetermined depth. Thereby, the connecting member 64 is easily inserted.

Further, referring to FIG. 2, the projection 63 is formed as a projection which is a component of the present invention at a position separated by a predetermined distance in the direction perpendicular to the axis of the cylinder main body 25 with respect to the dividing line P. At the bottom of the reservoir 24, the same direction as the bosses 27, 28 with respect to the cylinder body 25 is provided at a position opposite to the projection 63 with respect to the dividing line P by the predetermined distance.
A protruding body 65 is formed so as to protrude. As shown in the drawing, when the reservoir 24 and the cylinder body 25 are properly assembled, a part of the tip of the projection 63 and a part of the tip of the projection 65 are opposed to each other. That is, the protrusion 63
Is greater than the distance between the cylinder body 25 and the lower surface of the reservoir 24.

As shown in FIG. 1, the master cylinder 21 constructed as described above has a central axis C of the reservoir 24.
Is assembled to the cylinder body 25 at a predetermined angle (10 degrees in the present embodiment) with respect to the axis of the cylinder body 25, but when mounted on a vehicle, the reservoir 24 is horizontal as in the conventional case. (With the cylinder body 25 inclined).

According to the present embodiment, when the direction of the reservoir 24 with respect to the cylinder body 25 is proper, the reservoir 24 and the cylinder body 25 can be assembled without the projection 63 and the protrusion 65 contacting each other. Can, then
The reservoir 24 and the cylinder body 25 can be connected by aligning the holes 67 of the protrusion 63 with the through holes 68a, 68b of the flanges 62a, 62b and inserting the connecting member 64 therethrough.

However, the boss 27 of the cylinder body 25,
28 have the same shape, and the nipple portions 58, 59 of the reservoir 24 that fit into these recesses 29, 30 also have the same shape. In some cases, the direction of the reservoir 24 may be erroneously assembled. That is, it may be attempted to fit one nipple portion 58 of the reservoir 24 into the recess 30 and the other nipple portion 59 into the recess 29. At this time, the hole 67 and the through-holes 68a, 68
b are not aligned with each other, making it impossible to insert the coupling member 64. Therefore, since the reservoir 24 and the cylinder body 25 are not erroneously assembled, it is possible to obtain only the master cylinder which is always properly assembled.

Further, according to the present embodiment, the cylinder body 2
5 is formed so as to also serve as a projection for preventing erroneous assembly, so that the number of parts projecting from the cylinder body 25 can be reduced, and the cylinder body can be easily machined accordingly. Become.

Although the embodiments of the present invention have been described above, the present invention is, of course, not limited thereto, and various modifications can be made based on the technical concept of the present invention.

For example, in the above embodiment, only the protrusion 63 of the joint J is formed as a protrusion for preventing erroneous assembly.
Of course, the present invention is not limited to this, and only the flange portion may be formed as a protrusion for preventing erroneous assembly, or the protrusion and the flange may be formed as the protrusion and the protrusion.

In the above embodiment, the insertion port 66 of the coupling member 64 in the coupling portion J is formed only in one flange portion 62b. However, this insertion hole is formed in the other flange portion 62a so that the coupling member can be inserted from both directions. The insertion port 66 may be formed.

In the above embodiment, the master cylinder 21 having the joint J has been described. However, the present invention can be applied to a master cylinder having no joint J. In this case, the protrusions and protrusions for preventing erroneous assembly are not necessarily limited to the positions described in the above embodiments. For example, as schematically shown in FIG.
In the axial direction of the cylinder body 25, a cylindrical projection 16 may be formed on a reservoir (not shown) at an equal line P (extending in a direction perpendicular to the paper surface). The same effect as the example can be obtained. Also,
The set of the protruding portion and the protruding body is not limited to only one set, and as shown in FIG.
8b may be formed two sets each. In this case, the protrusion 17b and the protrusion 18a, and the protrusion
The portion 17a and the projection 18b are positioned symmetrically with respect to the bisector P.
Because it is formed to face the location, if it Kumitsukeyo the cylinder body 25 in a direction wrong reservoir, the protrusion 18
"a" comes into contact with the projection 17b, and the projection 18b comes into contact with the projection 17a.

[0027]

Further, in the above embodiment, the center valve type master cylinder has been described. However, as in the conventional example shown in FIG. 5, a conventional type master cylinder may be used.

[0029]

As described above, according to the master cylinder having the reservoir of the present invention, even if the reservoir is to be assembled to the cylinder body in the wrong direction, the projecting portions formed on the cylinder body and the reservoir, respectively. Since the projections come into contact with each other and function to prevent the assembling, erroneous assembling can be reliably prevented, and therefore, only the master cylinder always in a proper assembling state can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an entire master cylinder according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line [2]-[2] in FIG.

FIG. 3 is a plan view schematically showing a modified example of the present invention.

FIG. 4 is a plan view schematically showing another modification of the present invention.

FIG. 5 is a cross-sectional view showing the entirety of a conventional master cylinder.

[Explanation of symbols]

 21 Master Cylinder 24 Reservoir 25 Cylinder Body 26 Cylinder Hole 27 Boss 28 Boss 29 Recess 30 Recess 58 Nipple 59 Nipple 60 Grommet Seal 61 Grommet Seal 62a Flange 62b Flange 63 Convex (Protrusion) 64 Coupling Member 65 Projection P P Isosegment Q Centerline

Claims (2)

(57) [Claims] 1. A cylinder body having a cylinder hole formed therein, two boss portions projecting from the outer periphery of the cylinder body at the same height, and a recess formed in the boss portion and connected to the cylinder hole. And fitted into each of the recesses via a sealing member , facing the boss portion of the cylinder body.
One of and a formed reservoir nipple portion, the reservoir
Is mounted on the cylinder body in a specific orientation.
And the cylinder body has an axis line of the cylinder body.
Inclined with respect to a horizontal line by the vehicle mounted state, master with a reservoir central axis of the reservoir is inclined relative to the axis of the cylinder body to coincide with the vertical line in the vehicle mounted state of the cylinder body cylinder In the above, from the outer periphery of the cylinder body in the same direction as the boss portion and
A projecting portion projecting toward the reservoir, and a projecting portion extending from the bottom of the reservoir in the same direction as the boss portion and forwardly.
The protrusion protruding toward the cylinder body side is equally divided by the distance between the axes of the two bosses, and
Extending in the same direction as the axes of the two bosses at right angles to the axis of the body
Are formed opposite to each other at symmetrical positions
The height of each of the protrusions and the protrusions may be different from each other.
Smaller than the distance between the main body and the bottom of the reservoir,
And the sum of the protruding heights of the protruding portion and the protruding body
Is the distance between the cylinder body and the bottom of the reservoir.
Ri is set larger, by said projection and said protrusion from interfering with each other, before
With the cylinder body other than the specific orientation of the reservoir.
A master cylinder with a reservoir that prevents assembly . 2. A projection that projects from the cylinder body toward the bottom of the reservoir, and a flange that projects from the reservoir toward the cylinder body and is formed to overlap the projection. The convex portion and the flange portion are connected by inserting a coupling member on the dividing line, and the convex portion serves as the projecting portion, the flange portion serves as the projecting body, or the projecting portion The master cylinder with a reservoir according to claim 1, wherein the protrusion is formed as the protrusion, and the flange is formed as the protrusion.