JP3289741B2 - Jumping adjustment method of booster - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for adjusting jumping of a booster.

[0002]

2. Description of the Related Art Conventionally, as a booster, a valve body slidably provided in a shell, a valve plunger slidably fitted in a through hole of the valve body and interlocking with an input shaft, An output shaft having a base slidably attached to the valve body and facing the valve plunger;
A reaction disc interposed between the base of the output shaft and the valve plunger, configured to transmit a reaction force of the output acting on the output shaft to the input shaft via the reaction disc and the valve plunger, Further, the valve plunger may include a first member having a front end face abutting on the reaction disk, and a second member located on a rear side of the first member and abutting on a rear end face of the first member. Those composed of are known. In such a conventional booster, a small gap is maintained between the reaction disc and the tip of the valve plunger (the tip of the first member) in a non-operating state in which no differential pressure is generated. ,
When the pressure difference is generated and the booster is operated, the reaction disk is deformed toward the valve plunger, and the reaction force of the output acting on the output shaft is transmitted to the input shaft. Then, an abrupt increase in output is temporarily observed before the two members come into contact with each other, and this is generally called jumping. By the way, even in the case of conventional boosters manufactured to have the same dimensions, each booster causes a slight dimensional error, so that the jumping value of each booster needs to be constant. It is necessary to adjust the jumping value for each force device. Therefore, conventionally, the axial dimension of the valve plunger has been adjusted for each booster to adjust the distance between the end face of the reaction disc and the front end face of the valve plunger at the start of operation. More specifically,
A shim is interposed between the first member and the second member that constitute the valve plunger, and the jumping value is adjusted by adjusting the axial dimension of the entire valve plunger according to the number of the shims.

[0003]

However, in the conventional adjustment method using the above-described shim, the axial dimension of the valve plunger is adjusted stepwise in units of the number of shims, and therefore, the precise jumping value can be reduced. Adjustment was difficult. In order to solve such a disadvantage, for example, after manufacturing a first member of the valve plunger in advance to be longer, the first member is fixed to a lathe and its rear end is cut with a cutting tool. May be adjusted in the axial direction. According to such an adjustment method, the jumping value of the booster can be adjusted steplessly. However, in this adjustment method, when the rear end of the first member is completely cut with the cutting tool, a projection of cutting leakage due to the tip of the cutting tool remains at the center of the rear end surface. If such protrusions are present, the axial dimension of the valve plunger becomes inaccurate. Therefore, the protrusions remaining on the rear end face after the cutting by the cutting tool must be removed, complicating the operation.

[0004]

[Means for Solving the Problems] In view of such circumstances,
The present invention provides a valve body slidably provided in a shell, a valve plunger slidably fitted in a through hole of the valve body and interlocking with an input shaft, and sliding a base on the valve body. An output shaft freely attached and opposed to the valve plunger, and a reaction disk interposed between the base of the output shaft and the valve plunger, the output reaction force acting on the output shaft being The valve in a booster configured to transmit to the input shaft via a reaction disc and the valve plunger
Adjusting the axial dimension of the plunger allows
A jumping adjustment method of a booster configured to adjust a gap between a front end face of the valve plunger and a reaction disk at the beginning to obtain a predetermined jumping value, wherein the valve plunger is That
The front end face abuts against the reaction disc.
One member, and a flow member located on the rear side of the first member.
A second end of the first member abutting against a rear end of the first member.
And the first member or the first member.
Temporarily assembling a replacement master piece in the above valve body
And then measure the jumping value.
Calculating the amount of cutting of the end surface of the first member,
And adjust the axial dimension of the valve plunger.
Of jumper adjustment of booster
To offer.

[0005]

According to such an adjusting method, the end surface of the first member is provided.
And cut the end face of the first member by the required amount.
Once, it can be incorporated immediately booster the first member, whereby it is possible to obtain a predetermined jumping value. Therefore, as compared with the related art in which a shim is interposed between the first member and the second member to adjust the jumping value, more precise jumping adjustment can be performed in a stepless manner.

[0006]

FIG. 1 shows the inside of a tandem brake booster, in which a substantially cylindrical valve body 2 is slidably provided in a shell 1. FIG. ing. A conventionally known valve mechanism 5 including a vacuum valve 3 and an atmosphere valve 4 is provided in the valve body 2, and the valve mechanism 5 is operated in conjunction with an input shaft 6. . A valve plunger 7, which constitutes a part of the valve mechanism 5, is slidably fitted in a stepped through hole 2 </ b> A drilled in the axial direction of the valve body 2, and is fitted to the tip of the input shaft 6. Are linked. The valve plunger 7 includes a substantially cylindrical first member 8 located on the front side in the axial direction, and a second member 9 contacting the first member 8 from the rear side. The front end of the input shaft 6 described above is connected to the rear end of the second member 9, and the rear end of the second member 9 constitutes a valve seat 9 a of the atmospheric valve 4. The outer peripheral portion 9b on the front side of the second member 9 is formed in a cylindrical shape, and the outer peripheral portion 9b on the front side is formed in the small-diameter hole 2 at the center position in the through hole 2A.
a, the front end surface 9c is positioned in the large-diameter hole 2b. The first hole is provided in the large-diameter hole 2b.
The member 8 is slidably fitted, and the front end surface 9c of the second member 9 is brought into contact with the rear end surface 8a of the first member 8. The front end face 8b of the first member 8 is bulged toward the front side and has an arc-shaped cross section, and is opposed to the reaction disk 10 at an adjacent position. Further, the main body 8c of the first member 8 having a cylindrical shape is
As described above, the small-diameter portion 8 is fitted in the large-diameter hole 2b.
d is formed. The end surface of the small diameter portion 8d is the rear end surface 8a of the entire first member 8, and is in contact with the front end surface 9c of the second member 9 as described above.

Next, when the reaction disk 10 facing the first member 8 is housed in the base recess 11a of the output shaft 11, an annular protrusion provided on the bottom of the base recess 11a and the valve body 2 is provided. 2B. In a non-operating state of the booster in which no differential pressure is generated, a slight gap is maintained between the reaction disk 10 and the front end surface 8b of the first member 8. On the other hand, when the booster in which the input shaft 6 is advanced to generate the differential pressure is operated, the reaction disk 10 is deformed toward the first member 8 and the gap is eliminated.
Since the reaction disc 10 and the front end face 8b of the first member 8 are in contact with each other, the reaction force of the output acting on the output shaft 11 is transmitted to the input shaft 6 via the reaction disc 10 and the valve plunger 7. . It is known that the servo ratio temporarily increases until the reaction disk 10 and the front end surface 8b of the first member 8 come into contact with each other, and this sudden increase in the servo ratio is generally called jumping. . Then, after this jumping, the output increases at a predetermined servo ratio. By the way, when a booster having the above-described configuration is manufactured, a slight manufacturing error occurs for each component member. Therefore, in order to obtain a predetermined jumping value for each booster, a jumping value is set for each booster. Adjustment work is required.
Conventionally, adjustment is performed as follows. That is, a shim is interposed between the first member 8 and the second member 9 and the axial dimension of the entire valve plunger 7 is adjusted by the number of the shims. By interposing the shim between the two members 8 and 9 in this way, the gap between the reaction disk 10 and the tip of the valve plunger 7 (first member 8) at the start of the operation of the booster can be adjusted. To obtain a predetermined jumping value. However, in such a conventional adjustment method, since the adjustment is performed stepwise for each number of shims, it is difficult to precisely adjust the jumping value. In order to solve such a defect, for example, the first member 8 of the valve plunger 7 is required.
May be fixed to a lathe, and its rear end (the rear end of the small diameter portion 8d) may be cut with a cutting tool to adjust the axial dimension. Thereby, the axial dimension of the entire valve plunger 7 can be adjusted.

However, according to such an adjusting method, when the rear end of the first member 8 is completely cut with the cutting tool, a projection of cutting leakage due to the tip of the cutting tool remains at the center of the rear end face. Become. If such a projection exists, the axial dimension of the valve plunger 7 becomes inaccurate.
After the cutting by the cutting tool is completed, it is necessary to remove the projections remaining on the rear end surface of the first member 8, which complicates the operation. In this embodiment, the center of the rear end face of the first member 8, that is, the small diameter portion 8
A bottomed hole 8e as a concave portion is formed in advance at the center of the end face of the end d, and jumping is adjusted by cutting the rear end of the small diameter portion 8d with a cutting tool. The axial dimension of the small diameter portion 8d is
It is set to be larger than the swelling amount of the front end face 8b. With this configuration, even when the first member 8 is fitted in the large-diameter hole 2b in the opposite direction when the booster is assembled, the first member 8 can be checked by the characteristic diagram of the servo ratio. It can be easily determined that the first member 8 is reversely assembled in the large-diameter hole 2b. On the other hand, the outer diameter of the small-diameter portion 8d is set to be larger than the outer diameter of the front-side outer peripheral portion 9b of the second member 9, and as shown in FIG.
The outer peripheral edge of the front end surface 9c of the member 9 is chamfered to be a curved surface. Therefore, as shown in FIG. 2, in a state after the assembly of the booster is completed, in a state where the advanced second member 9 is slightly inclined, the outer peripheral edge of the front-side end face 9 c of the second member 9. However, even if the front end abuts on the rear end face 8a of the first member 8, the outer end edge of the front end face 9c is a smooth curved surface, so that the outer end edge and the rear end face 8a of the first member 8 stick together. Can be prevented.
On the other hand, when the outer peripheral edge of the front end surface 9c of the second member 9 is not a curved surface but has an acute angle, the outer peripheral edge of the front end surface 9c and the rear end surface 8a of the first member 8 are separated. It comes up like a stick.

[0009] When the valve plunger 7 of the present embodiment configured as described above is incorporated in a booster, the jumping value is adjusted as follows. Here, the jumping value to be obtained when the booster is finally assembled is assumed to be J1. First, in addition to the first member 8 and the second member to be actually incorporated into the booster, the first member 8 as a master piece having a predetermined axial dimension is prepared in advance. And
Instead of the first member 8 to be actually assembled, the first member 8 and the second member as master pieces are assembled into a booster to temporarily assemble the whole. Then, the servo ratio of the temporarily assembled booster is measured, and the jumping value J2 at this time is detected. Next, the jumping value J2 obtained by the above measurement is compared with the jumping value J1 finally obtained, and the axial length of the first member 8 at which the jumping value J1 finally obtained is obtained. In addition to obtaining the length L1, the above-mentioned L1 is subtracted from the axial length L2 of the first member 8 which is to be actually incorporated into the booster, and the dimension L3 to be reduced in the axial length L2 of the first member 8 is obtained. . In this embodiment, since the axial length of the first member 8 to be incorporated into the booster is manufactured to be longer, when the dimension L3 to be shortened is obtained as described above, the booster is increased by the dimension L3. In the small diameter portion 8d of the first member 8 to be incorporated into the device,
The end face on the mating side is cut with a cutting tool. Thereby, the axial dimension of the first member 8 can be reduced to a dimension at which the above-described finally obtained jumping value J1 is obtained. In the present embodiment, the rear end surface 8 of the first member 8 is used.
Since the bottomed hole 8e as a concave portion is formed in a, the small diameter portion 8d of the first member 8 is cut with the cutting tool as described above, and a cutting residue due to the tip of the cutting tool occurs at the center of the rear end face 8a. Absent. Therefore, immediately after this, the first member 8 as the master piece is immediately taken out of the temporarily assembled booster, and instead of the first member 8 which has been cut,
May be incorporated into the booster. As described above, in the present embodiment, the first member 8 as a master piece having a predetermined length is prepared, and adjustment is performed for each booster such that a predetermined jumping value is obtained in the manner described above. I have to. Therefore, the jumping value can be set steplessly and precisely as compared with the related art in which a shim is interposed between the members 8 and 9.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIG. 3. In the second embodiment, the small-diameter portion 10 of the first member 108
8d is reduced in diameter, and its small diameter portion 108d is extended rearward so as to be slidably fitted in the small diameter hole 102a of the valve body 102. On the other hand, the second member 109
The axial dimension is reduced by the extent that the small diameter portion 108d of the first member 108 is extended in the axial direction. The rear end face 108a of the first member 108 and the front end face 109c of the second member 109, which are in contact with each other,
02a. Other configurations are
The members are the same as those in the first embodiment, and the members corresponding to those in the first embodiment are given member numbers obtained by adding 100 to each member. Even with the configuration of the second embodiment, the first
The same operation and effect as the embodiment can be obtained. Since the small-diameter portion 108d is fitted in the small-diameter hole 102a with a smaller diameter than that of the first embodiment, the first member 108
Is installed in the large-diameter hole 2b in the opposite direction, it is very easy to determine that it is in the opposite direction at the time of assembling. In the above embodiment, the first member 8 as a master piece is prepared in advance, and the first member 8 as a master piece is prepared for each booster to be adjusted.
Although the amount of shortening of the first member 8 that is to be actually incorporated into each booster is obtained after the above is incorporated, the following may be adopted. That is, first, the first
After assembling the member 8 into the booster, a jumping value in that case is determined, and then the jumping value is compared with a jumping value to be finally obtained to determine the amount of shortening of the first member 8. Ask. Next, the first member 8 may be taken out from the booster, the first member 8 may be cut with a cutting tool by the determined amount of shortening, and then may be incorporated into the booster again.

[0011]

As described above, according to the present invention, there is obtained an effect that more precise adjustment of jumping can be performed in a stepless manner as compared with the related art.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention.

FIG. 2 is an enlarged view showing a different state of a main part of FIG. 1;

FIG. 3 is a sectional view showing another embodiment of the present invention.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 shell 2 valve body 7 valve plunger 8 first member 8 a rear end face 8 e bottomed hole (recess) 9 second member 10 reaction disk 11 output shaft

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-215558 (JP, A) JP-A-2-59065 (JP, U) JP-A-4-503478 (JP, A) Takuo Seto, Junichiro Oi Lathe Practicing, 5th edition, Ichigaya Shuppansha (Showa 51), p. 104, lines 16 to 20 Skilled Professionals' Society, Skill Books (3) / Lathe Technician, 11th edition, Okawade Edition (Showa 53) Year) p. 72 2nd (58) Field surveyed (Int. Cl. ⁷ , DB name) B60T 13/573

Claims (1)

(57) [Claims] 1. A valve body slidably provided in a shell, a valve plunger slidably fitted in a through hole of the valve body and interlocking with an input shaft, and a base slidable on the valve body. An output shaft movably mounted and opposed to the valve plunger, and a reaction disk interposed between the base of the output shaft and the valve plunger, and a reaction force of an output acting on the output shaft is provided. In the booster configured to transmit to the input shaft via the reaction disc and the valve plunger,
Operated by adjusting the axial dimension of the valve plunger
A jumping adjustment method of a booster configured to adjust a gap between a front end face of the valve plunger at the start and a reaction disk to obtain a predetermined jumping value, wherein the valve plunger is The front end face is
A first member that abuts against the
The first member is located on the rear side, and the front end surface thereof is the first member.
And a second member contacting the rear end surface of the
One member or a master piece to replace this first member
Temporarily assemble into the valve body and then set the jumping value.
Measure and cut the end face of the first member based on the measured value
Calculate the amount, cut the end face of the first member, and
Adjusting the axial dimension of the plunger
How to adjust the jumping of power devices.