JPH0719138A - Fixture for in-line injection pump - Google Patents

Abstract

PURPOSE:To enable a pump to be fitted easily with accuracy by providing a member to be fitted by socket and spigot jointing to the flange part of the pump while having the driven shaft of the pump inserted through, and plural members mutually orthogonal and respectively extended in the axial direction of the pump so as to be selectively fixed to an engine. CONSTITUTION:A bracket 1 serving as a fixture for fitting in-line injection pumps to a diesel engine is formed of a first to a third integrally-formed members 3, 5, 7. In the first member 3, a fit-in part 9 to a spigot joint part provided at the bearing outer part of a pump flange part is formed around an axial hole 11, and numerous fixing threaded holes 13, 15, 17, 19 are bored therein. The second member 5 is provided with plural bolt holes 21, 23 bored to clamp-fix the bracket 1 to the cylinder block of the engine. The third member 7 is provided with a circular arc shape floor face 2 formed to avoid interference with the pump flange part at the fitting time of the bracket 1 and pump housing flange part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fitting used for mounting a column fuel injection pump on a diesel engine.

[0002]

2. Description of the Related Art When a column type fuel injection pump is mounted on a diesel engine, the column type injection pump is mounted via respective fittings corresponding to the type of diesel engine such as a series type multi-cylinder diesel engine or a V type multi-cylinder diesel engine. It is fixed with multiple tightening bolts. For example, when a column injection pump is attached to an in-line multi-cylinder diesel engine, the column injection pump is fixed to the side surface of the engine cylinder block by a pump attachment with a fastening bolt. When a column injection pump is mounted on a V-type diesel engine, the column injection pump is fixed to the upper surface of the engine cylinder head by a plurality of fastening bolts with a grooved fitting.

As described above, the in-line injection pump is currently attached by different attachments for different types of diesel engines.

[0004]

However, in general, when a column injection pump is attached to the side of a cylinder block of an in-line multi-cylinder diesel engine or the upper part of a V-type diesel engine, the drive shaft on the diesel engine side and this drive shaft It is not easy to align the shaft with the driven shaft of the row-type injection pump to which the power is transmitted from. The shaft misalignment between the drive shaft of the diesel engine and the driven shaft of the row-type injection pump is, for example, eccentricity ≦ 0.3 and declination ≦ 3 during coupling coupling transmission.
The combined cumulative tolerance of each part is set so as to be 0 '. In the case of gear drive, the eccentricity value is 1/10 to 1/1 of this value.
Unless it is reduced to 13 or less, the bearing of the row-type injection pump or the driven shaft (pump shaft) may be damaged due to repeated unbalanced loads. Also, when the gear is driven, the parallelism of the shaft ≤ 0.
There is a problem that the noise is significantly increased due to the abnormal wear due to the one-sided contact of the gear with the decrease of 05 °.

For example, an example of a conventional row type injection pump is shown in FIG.
3, shown in FIGS. 24 and 25. The row-type injection pump 90 and the bracket 94 are fixed to the bracket 94 with bolts 97 and 98, and the arm portion 99 of the bracket 94 is fixed to a cylinder block of a diesel engine (not shown) with bolts 100 and 101. Then, as shown by the chain double-dashed line in FIG. 24, the row injection pump 90 is positioned in the diesel engine by the knock pin 96 via the bracket 94. For this reason, the error in the positioning tolerance between the drive shaft of the diesel engine side and the driven shaft 99 of the column injection pump 90 becomes large, and therefore the drive shaft of the diesel engine side and the driven shaft 99 of the column injection pump side are separated. Eccentricity and declination tend to increase.

An object of the present invention is to reduce the eccentricity and eccentricity of the drive shaft on the diesel engine side and the driven shaft on the side of the row type injection pump, and to greatly improve the mounting accuracy.
An object of the present invention is to provide a fixture for a row-type injection pump that has improved reliability by preventing damage to the shaft or bearing of the pump, or gear, and has improved environmental improvement by reducing gear noise.

[0007]

In order to achieve the above-mentioned object, a fixture for a row injection pump according to the present invention is a row injection pump having a pump portion having a flange portion and a governor portion in an internal combustion engine. A mounting member for a row-type injection pump for mounting, comprising: a first member having a fitting portion that is inserted through a driven shaft of the row-type injection pump and has a spigot fitting to the flange portion; and the first member. A second member that is integrally formed, extends in the axial direction of the row-type injection pump, and is selectively fixed to the internal combustion engine; and integrally forms the first member and the second member with the first member and And a third member extending in a direction perpendicular to the second member and in the axial direction of the row-type injection pump and selectively fixed to the internal combustion engine.

[0008]

According to the fixture for a row type injection pump of the present invention, the fitting portion of the first member and the flange portion of the row type injection pump are united by fitting with a spigot formed outside the bearing. The second member or the third member is selectively coupled and fixed to the diesel engine according to the type of diesel engine. For this reason, in order to reduce the number of mounting parts and mounting points on the diesel engine side, and to greatly improve the fitting accuracy to 1/10 or less of the conventional level, the drive shaft on the diesel engine side and the driven shaft on the row injection pump side are driven. It is possible to reduce the eccentricity and the declination with respect to.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of a fixture for a row type injection pump of the present invention.
~ Shown in FIG. The bracket 1 as a fixture for a row injection pump is a fixture for attaching the row injection pump to a diesel engine. The bracket 1 includes a first member 3 for mounting a flange portion of a row-type injection pump, a second member 5 for bolting to a side surface of a diesel engine, and a diesel engine through a top surface of the diesel engine or a second bracket (not shown). And a third member 7 for attaching to the side surface of the engine. First member 3, second member 5, and third member 7
Are integrally formed.

The first member 3 has a spigot on the outside of the bearing on the flange portion of the row type injection pump, and a spigot fitting portion 9 for fitting the spigot is formed in an annular shape around the shaft hole 11. . Inner diameter of shaft hole 11: D (JIS fitting H7 ± 0.03), position of shaft hole 11: X (± 0.0
3), Y (± 0.03), position of bolt hole 23: Zx
(± 0.1), Zy (± 0.03), and the distance between the bolt holes 21 and 23: Ty (± 0.03). Further, the driven shaft of the row-type injection pump is inserted into the shaft hole 11 of the first member 3, and the first portion is attached to the flange portion of the row-type injection pump.
Screw holes 13, 15, 17, 19 for fixing the member 3
Are formed on the first member.

The second member 5 is formed integrally with the first member 3, extends vertically from the end of the first member 3, and
Bolt holes 21 and 23 for fastening and fixing the bracket 1 to a side surface of a cylinder block of a diesel engine are formed at a central portion in the axial direction of the row injection pump. Third member 7
Is formed integrally with the first member 3 and the second member 5, extends vertically from the end of the first member 3 and the end of the second member 5, and attaches the bracket 1 and the flange portion 50 of the pump housing. When, the flange part 4 of the row type injection pump
2. An arcuate floor surface 29 having a size for avoiding interference with 2
Have. The arc-shaped floor surface 29 is formed so as to have a thicker wall thickness in the direction of the diesel engine side and in the direction opposite to the diesel engine side from the center part of the arcuate floor surface 29.
5, 27 are formed.

(1) Side-Mountable Bracket Next, FIGS. 5 to 9 show an example in which the bracket 1 is processed into a side-mountable bracket. The side-mounted bracket 20 is an example in which the third member 7 of the bracket 1 shown in FIG. 3 is cut at 31, 33 shown by dotted lines. That is, FIG.
As shown in FIG. 3, the third member 7 of the bracket 20 has cut surfaces 35 and 37 that are easily cut by a saw or the like at a place passing through an as-cast long hole formed of special cast iron (eg, ductile cast iron). is doing. This is to reduce the weight of the bracket 20 by cutting a part of the third member 7 with the cut surfaces 35 and 37 and removing the cut portion because it is unnecessary.

FIG. 10 and FIG. 11 show a state diagram in which the bracket 20 is attached to the row type injection pump. The first member 3 of the bracket 20 is bolted to the flange portion 42 of the row type injection pump 40 by bolts 44, 45, 46 and 47. In this case, since the spigot outside the bearing cover 52 fitted to the flange portion 42 of the row-type injection pump 40 and the first member 3 of the bracket 20 are positioned and fixed by the spigot fitting, the first member of the bracket 20 is fixed. 3 and the position accuracy on the diesel engine side is almost doubled compared to the conventional one. The bracket 20 on which the row type injection pump 40 is mounted is tightened and fixed to the side surface of the cylinder block of the diesel engine with bolts 48 and 49. The drive shaft of the in-line multi-cylinder diesel engine and the driven shaft of the in-line injection pump are connected by a coupling or gear that uses several thin plates (t = 0.5).

Details of the row type injection pump mounted on the bracket 20 are shown in FIGS. 12, 13 and 14. A bearing cover 52 is fixed to a pump housing flange portion 50 of the row-type injection pump 40 with bolts 54. The bearing cover 52 is composed of a small diameter portion 51 fitted to the inner wall of the pump housing flange portion 50 and a large diameter portion 53 fitted in the shaft hole 11 of the bracket 20 in a spigot manner. It forms an outer diameter d. On the inner wall of the small diameter portion 51 of the bearing cover 52,
A bearing 56 that rotatably supports a driven shaft 99 as a pump cam shaft is fixed. The large diameter portion 53 forming the spigot outer diameter d of the bearing cover 52 forms the spigot inner diameter D of the bracket 20.
The spigot mating is made in accordance with the JIS mating fit of φD _H and φD _h . As a result, the positioning accuracy of the drive shaft on the diesel engine side and the driven shaft 99 on the row injection pump 40 side is improved.

(2) Saddle mount type bracket Next, FIGS. 15 to 19 show an example in which the bracket 1 is processed into a saddle mount type bracket. The saddle mounting type bracket 60 is obtained by cutting the bracket 1 shown in FIG. 4 along the surfaces 61 and 63 shown by dotted lines, and as shown in FIG. 16, has the cut surfaces 65 and 67 formed by this cutting.
As a result, the weight of the bracket is reduced. The bracket 60 is fixed to the upper surface of the cylinder head of the V-type multi-cylinder diesel engine by bolts inserted through the bolt holes 25 and 27 with the column injection pump mounted on the floor surface 29 of the third member 7. The drive shaft of the V-type multi-cylinder diesel engine and the driven shaft of the in-line injection pump are connected by a gear or the like.

In the case of this saddle mounting type bracket, the distance Tx between the bolt holes 25 and 27, the positions Zx and Zy of the bolt hole 25, and the distance Tx between the bolt holes 25 and 27 are specified. Since the shaft hole 11 of the first member 3 and the large-diameter portion 53 of the bearing cover 52 of the row-type injection pump are fitted in the spigot joint, the positioning accuracy of the bracket 60 and the row-type fuel injection pump is enhanced as described above. Therefore, the alignment accuracy between the row-type injection pump and the diesel engine side drive shaft is improved.

Next, FIGS. 20, 21 and 22 show an example of mounting a column injection pump on various types of diesel engines using the bracket 20 described above. (i) Side mount type bracket on the side of in-line multi-cylinder diesel engine The side mount type bracket shown in FIG.
In-line diesel engine 7 with 0 to bolts 69, 71
The row-type injection pump 40 is fixed to the side surface 721 of the cylinder block 72 of No. 0.

(Ii) Saddle mounting type bracket on the side surface of the in-line type multi-cylinder diesel engine The side mounting type bracket shown in FIG. 21 has a cross section L on the side surface 721 of the cylinder block 72 of the diesel engine 70.
By fixing the L-shaped bracket 73 in the shape of a letter with bolts 79,
Attach the bracket 60 to the L-shaped bracket 73 with bolts 7
It is fixed by 5, 77. The column-type injection pump 40 is attached to the bracket 60.

(Iii) Saddle mount type bracket on the upper surface of V type multi-cylinder diesel engine In the saddle mount type shown in FIG. 22, the column injection pump 40 is attached to the V type diesel engine using the bracket 60. Here is an example. In this example, the bracket 60 is fastened and fixed to the upper surface 84 of the valley portion of the cylinder head 89 of the V-type diesel engine 82 with bolts 81 and 83.
As shown in FIG. 22, the row-type injection pump 40 has four elongated holes provided in the flange portion 42 of the row-type injection pump 40 in order to improve the handling of the injection pipe (within the range of the angle θ). ) The tilt angle can be changed.

Next, when the brackets 20 and 60 according to the embodiment of the present invention are used, the shaft misalignment accuracy between the drive shaft on the diesel engine side and the driven shaft on the row injection pump side is shown in FIG.
3, the shaft deviation accuracy between the drive shaft on the diesel engine side and the driven shaft on the row injection pump side when the bracket 94 according to the conventional comparative example shown in FIG. 24 and FIG. 25 is used is compared.

In each of the above-described embodiments of the present invention, the flange portion 42 of the row-type injection pump 40 and the small-diameter portion 51 of the bearing cover 52 are spigot-fitted according to the JIS fitting H ₇ and h ₆ grades. Of the large diameter portion 53 of the bracket 20 and the fitting portion 9 of the bracket 20 or 60 in the same manner as H ₇ and h ₆
This bracket 20 or 6 with spigot mating grade
Since 0 is fixed to the diesel engine, the positioning tolerance between the diesel engine side drive shaft and the injection pump side driven shaft can be greatly reduced.

On the other hand, the conventional row type injection pump 90
Does not have a spigot fitting part on its flange part 92, and R (± 0.05) on the bottom of the pump is R of the bracket.
Since it is joined to the (+0.15 +0.05) surface, and the (center misalignment) intersection between the center point of R and the processing reference surface (mounting surface) is also ± 0.05 from the viewpoint of productivity. The positioning accuracy when the row-type injection pump 90 is attached to a diesel engine is half that of the present invention.

[0023]

As described above, according to the fitting for a row type injection pump of the present invention, the flange portion of the row type injection pump is spigot-fitted to the fitting. This fit is, for example, J
Hole side H ₇ of IS, to shaft side h ₇ or h ₆ grades. In addition, since it is easy to increase the machining accuracy from the center of the spigot to the machining reference surface (mounting surface) to approximately half the shape of the bracket, this fitting is fixed to the internal combustion engine. The eccentricity and the eccentricity of the drive shaft of the above and the driven shaft on the side of the row type injection pump are reduced to half or less, and the positioning accuracy can be easily improved. As a result, damage is prevented because the bearings or shafts of the row-type injection pump and the diesel engine are prevented from being damaged, and noise is reduced because the meshing of the gears is improved due to the reduction of the angle of deviation due to shaft misalignment. As a result, there is an effect that the operator's fatigue in the vehicle or the passenger's discomfort is reduced, and the effect on the environment is improved.

[Brief description of drawings]

FIG. 1 is a side view showing a fixture for a row type injection pump according to an embodiment of the present invention.

FIG. 2 is a front view showing a fixture for a row type injection pump according to an embodiment of the present invention.

FIG. 3 is a plan view showing a fixture for a row type injection pump according to an embodiment of the present invention.

FIG. 4 is a sectional view taken along line IV-IV shown in FIG.

FIG. 5 is a side view showing a side mount bracket according to an embodiment of the present invention.

FIG. 6 is a front view showing a side mount bracket according to an embodiment of the present invention.

FIG. 7 is a plan view showing a side mount bracket according to an embodiment of the present invention.

8 is a sectional view taken along line VIII-VIII shown in FIG.

9 is a sectional view taken along line IX-IX shown in FIG.

FIG. 10 is a side view showing a state in which a side attachment type bracket is attached to the row type injection pump.

FIG. 11 is a front view showing a state where a side-mounting bracket is attached to the row-type injection pump.

FIG. 12 is a partially cutaway side view showing the row-type injection pump.

FIG. 13 is a front view showing the row-type injection pump.

FIG. 14 is a plan view showing a row type injection pump.

FIG. 15 is a front view of a saddle mount bracket according to another embodiment of the present invention.

16 is a sectional view taken along line XVI-XVI shown in FIG.

FIG. 17 is a plan view of the bracket shown in FIG.

18 is a sectional view taken along line XVIII-XVIII shown in FIG.

19 is a sectional view taken along line XIX-XIX shown in FIG.

FIG. 20 is a partially cutaway cross-sectional view showing a state in which a row-type multi-cylinder diesel engine and a row-type injection pump are attached by a side attachment type bracket.

FIG. 21 is a partially cutaway sectional view showing a state in which a row-type multi-cylinder diesel engine and a row-type injection pump are attached by a saddle-type bracket.

FIG. 22 is a partially cutaway cross-sectional view showing a state in which a V-type multi-cylinder diesel engine and a row-type injection pump are attached by a saddle-type bracket.

FIG. 23 is a partially cutaway sectional view showing a conventional row type injection pump.

FIG. 24 is a front view showing a state in which a conventional row type injection pump and a bracket are attached.

FIG. 25 is a plan view showing a mounting state of a conventional row-type injection pump and a bracket.

[Explanation of symbols]

 1 bracket 3 1st member 5 2nd member 7 3rd member 9 fitting part 20 bracket 40 row type injection pump 42 flange part 51 small diameter part 52 bearing cover 53 large diameter part (flange part) 60 bracket 99 driven shaft

Claims (1)

[Claims] 1. A mounting device for a row injection pump for mounting a row injection pump having a pump portion having a flange portion and a governor portion on a pump housing to an internal combustion engine, the driven shaft of the row injection pump. A first member that has a fitting portion that inserts through the flange and a spigot fitting to the flange portion, and that is integrally formed with the first member, extends in the axial direction of the row-type injection pump, and is selectively fixed to the internal combustion engine. A second member formed integrally with the first member and the second member, extending in a direction perpendicular to the first member and the second member and in the axial direction of the row-type injection pump, and selected as an internal combustion engine. And a third member that is fixed in a stationary manner.