JPH02211337A - Throttle valve driving device for v-shaped internal combustion engine - Google Patents

Abstract

PURPOSE:To secure the smooth opening and closing of a throttle valve and develop the superior operation performance by connecting the first and second valve shafts with the third valve shaft through a ball receiving part and an engagement part and constituting each ball receiving part from a ball part and a receiving part. CONSTITUTION:When the third valve shaft 1c revolves, the revolution torque is transmitted through the engagement parts 24 and 24 to the first and second valve shafts 11a and 11b which are connected by the ball receiving parts 23 and 23, and each throttle valve is revolved synchronously. As for each ball receiving part 23, 23, a flat surface part for absorbing the position deflection in the longitudinal direction of a cylinder head is formed, and a throttle valve smoothly revolves, even if the installation error in the longitudinal direction of the cylinder head exists between the first and second valve shafts 11a and 11b which are supported by the collector parts 9a and 9b and the third valve shaft 11c supported by the branch parts 10a and 10b. Further, the mutual opening degree relation between the throttle valves can be adjusted freely by the operations of the engagement parts 24 and 24, and each opening degree of the both throttle valves is correctly coincided.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement of a throttle valve driving device in a V-type internal combustion engine.

(Prior Art) As a conventional throttle valve drive device for a V-type internal combustion engine, the one shown in FIG. 13, for example, is known (see Japanese Patent Publication No. 14182/1982, etc.).

■Right and left banks configured in a shape] The same number of cylinders (for example, 3 or 4 cylinders) are arranged in each of a and 1b, and each cylinder is connected to a common crankshaft (output shaft) arranged between the banks. The pistons are connected.

In order to introduce intake air into each cylinder, collector portions 9a and 9b of intake manifolds 8a and 8b are disposed in parallel to each other above the cylinder heads 5a and 5b of each bank 1a and 1b. Branch portions 10a and 10b branch from each collector portion 9a and 9b at approximately right angles corresponding to the number of cylinders.
It extends toward the intake boat of each cylinder of banks 1b and 1a facing each other.

The intake duct 3 from the air cleaner 2 is connected to each collector portion 9a.
, 9b are provided with throttle chambers 6a, 6b, respectively, and throttle valves 7a, 7b for controlling the amount of intake air are interposed inside these throttle chambers 6a, 6b.

The throttle valves 7a and 7b are thickly connected by a valve shaft 11 arranged to cross between each bank 1a and 1b, and a throttle drum 12 attached to the valve shaft 11 is connected to the throttle valves 7a and 7b.
The opening degrees of the throttle valves 7a and 7b are adjusted by being rotated via a throttle wire linked to an accelerator pedal (not shown).

(Problem to be Solved by the Invention) Incidentally, in such a conventional device, the throttle valves 7a and 7b, which are located above each bank 1a and 1b and are separated from each other, are connected to both ends of a long valve shaft 11. Therefore, due to manufacturing errors and variations in assembly accuracy of the throttle chambers 6a, 6b assembled to the intake manifolds 8m, 8b, the throttle valves 7m, 7b
may not rotate smoothly, and it is also difficult to adjust the left and right throttle valves 7a and 7b to the same opening, which may cause problems between the two throttle valves 7a and 7b due to the difference in intake air amount, especially in the operating range where the throttle valve opening is small. There was also the problem that the output imbalance between banks deteriorated driving performance. Further, in order to take out the signal negative pressure that controls the operation of the EGR valve and the canister valve, negative pressure passages 40 and 41 are opened near the throttle valve 7a (7b), as shown in FIG. However, if the throttle valve 7a is assembled with poor precision, the negative pressure taken out will fluctuate with respect to the opening of the throttle valve 7a, causing the EGR valve and canister valve to be driven unnecessarily, resulting in poor exhaust performance. There were also problems.

The present invention aims to solve such problems.

(Means for Solving the Problems) Accordingly, the present invention arranges a collector portion of an intake manifold above the cylinder head of each bank configured in a V shape, and connects branch portions branched from these collector portions to respective predetermined cylinders. A throttle valve drive device for a ■-type internal combustion engine, in which a throttle chamber is arranged at the end of each collector section, and the accelerator pedal depression force is transmitted to the throttle valve housed in each throttle chamber. The first and second valve shafts are rotatably supported by each of the throttle chambers, and the third valve shaft is located between these valve shafts and rotatably supported by some of the branch parts. A throttle drum arranged substantially coaxially and connected to a throttle wire is attached to the third valve shaft, while the first and second valve shafts and the third valve shaft are inserted into contact with each other substantially coaxially. The ball bearing part and the shaft center are connected to each other via a locking part that locks the shaft center in an adjustable manner at uneven positions. an upper part having flat parts on both sides and curved parts on both sides in the vertical direction;
It is composed of six circular recesses and a receiving part.

(Function) When the third valve shaft rotates in conjunction with the accelerator pedal, rotational torque is transmitted to the first and second valve shafts coaxially connected thereto by the ball bearing part via the locking part, Each throttle valve rotates synchronously.

A flat part is formed in the ball bearing part to absorb displacement of the cylinder head in the longitudinal direction, so that the first and second valve shafts supported by the collector part via the throttle chamber, and supported by the branch part. between the third valve shaft and the
Even if there is an installation error in the longitudinal direction of the cylinder head, the throttle valve can be rotated smoothly.

Further, the mutual opening degree relationship of the throttle valves can be freely adjusted by operating the locking portion, and the opening degrees of both throttle valves can be made to match accurately.

(Example) Hereinafter, an example of the present invention will be described based on the drawings. In this embodiment, the present invention is applied to a V-type six-cylinder internal combustion engine, and as shown in FIGS. 1 to 3, an intake manifold 8
The collector parts 9a, 9b of a, 8b are connected to each bank 1a,
Banks 1b, which extend in the engine longitudinal direction above and parallel to 1b, and which are opposite from these collector parts 9a and 9b,
Branch portions 10a and 10b connected to each cylinder of 1a are branched at approximately right angles.

Throttle chambers 6a, 6b are attached to the inlet portions of the collector portions 9a, 9b connected to the intake duct 3;
As shown in FIGS. 4 and 5, the throttle chambers 6 a and 6 b are fastened to the collector portions 9 a and 9 b from the longitudinal direction by four bolts 15 , among which bolts 15 on the diagonal line Correct positioning is achieved by the two dowel collars 16 located at.

One ends of valve shafts 11a and llb, which respectively support throttle valves 7a and 7b housed inside, protrude through the throttle chambers 6m and 6b in the horizontal direction.
, the angular position around the axis relative to 9b is the dowel collar 1
6, the valve shafts 11a and llb are correctly positioned coaxially with each other in the horizontal direction.

A third valve shaft lie is disposed coaxially between these valve shafts 11a and llb, and the valve shafts 11a, 11b and 11C are coaxially connected to each other as will be described later. Ru.

As shown in FIG. 3, FIG. 6, and FIG. 7, the intake manifolds 8a and 8
A substantially U-shaped bracket 18 is connected to the boss portions 17a and 17b protruding from the frontmost branch portions 10a and 10b of the engine, and another boss portion (not shown).
These 0-shaped brackets 1 are bolted together from the front of the engine via mounting bosses 19&, 19b, and 19c, respectively.
8, the valve shaft 11c is rotatably supported by bearings 20a and 20b. These mounting boss parts 19a, 1
The bolt holes 21 formed in the bolt holes 9b and 19C are so-called blank holes, and when assembling the valve shaft lie supported by the bracket 18, the bolt holes 21 formed in the throttle chambers 6a and 6b are attached to the valve shafts 11a and llb of the respective throttle chambers 6a and 6b. On the other hand, it is possible to adjust the position for coaxial arrangement.

Note that the bearings 20a and 20b are formed of ball bearings or the like, and are housed inside the bracket 18.

A throttle drum 12 to which a throttle wire 13 is connected is fixed to the valve shaft lie, located inside a 0-shaped bracket 18. axis 1
1c is designed to rotate.

In this embodiment, a drum 12a that is connected to the auto speed controller in parallel with the throttle drum 12 is fixed to the valve shaft 11c.

This valve shaft 11c and the two valve shafts 11a and llb are coaxially connected to each other by a ball bearing part 23 and a locking part 24, as shown in FIG. 3, FIG. 8, and FIG. The throttle valves 7a and 7b rotate in the same manner as the valve shaft 11C rotates. (
Note that for convenience of explanation, only one connecting portion is shown) The ball receiving portion 23 is a soil portion 25 formed at the end of the valve shaft 11c.
is inserted into a receiving portion 26 formed at the end of the valve shaft 11b to position both shafts.

Further, the locking portion 24 has a locking lever 27 that projects horizontally at a position eccentric from the axis of the valve shaft 11c.
The adjustment screw 29 is located between a pair of holding levers 28a and 28b which are also eccentrically provided from the axis of b and protrudes horizontally, and is screwed onto the holding lever 28a, and the holding lever 28.
The stopper bin 3 is biased by a spring 32 provided at b.
0, and thereby transmits the rotational torque acting on the valve shaft 11c to the valve shaft 11b.

By finely adjusting the adjustment screw 29, the valve axis
The rotation angle of the valve shaft 11b with respect to the rotation angle changes, thereby making it possible to independently adjust the opening degree of the throttle valve 7b. Note that 31 is a locking nut for the adjustment screw 29.

Next, the ball bearing part 23 is connected to the valve shaft lie and 1lb (ll).
In order to absorb the displacement of the cylinder head in the longitudinal direction with respect to a), as shown in FIGS. 10 to 12, the ball portion 2
A flat portion 25a is formed on both sides of the cylindrical member 5, and curved portions 25b mainly having a spherical surface are formed above and below the flat portion 25a. In this case, when the throttle valve is fully closed, the flat part 25a is formed so as to be orthogonal to the longitudinal direction of the cylinder head, that is, to face in the vertical direction, and to be located at a distance y in the vertical direction relative to the circular recess 26a formed in the receiving part 26. The clearance X in the longitudinal direction is also set to be larger than the gap X in the longitudinal direction, thereby compensating for the deviation in the axes of the valve shafts 11c and llb in the longitudinal direction, thereby enabling smooth rotation.

The vertical direction of the ball portion 25 is a curved surface portion 25b mainly composed of a spherical surface, and the gap y is made small to suppress rattling between the valve shafts in the vertical direction when torque is transmitted by the locking portion 24.

In FIG. 2, reference numeral 60 indicates an ignition coil that supplies high-voltage ignition current to the ignition plug 61. This ignition coil 60 is provided for each cylinder, but is attached to the side surface of the branch portion 10a. This ensures its cooling performance.

The structure is as described above, and the operation will be explained next.

When the throttle wire 13 is pulled in conjunction with an accelerator pedal (not shown) and the throttle drum 12 rotates, the valve shaft 11c rotates integrally with this. The rotation of the valve shaft 11c is transmitted to the left and right valve shafts 11a and 11b via the locking part 24 which rotates around the ball bearing part 23, thereby causing the throttles housed in each throttle chamber 6a, 6b to rotate. The valves 7a and 7b rotate synchronously to adjust their opening degrees.

The ball bearing part 23 has a flat part 25m formed in the ball part 25 so as to absorb displacement in the longitudinal direction of the cylinder heads 5a, 5b, so that the throttle chambers 6a, 6b, which support the valve shafts 11a, 11b, Even if there is a mounting dimensional error in the longitudinal direction of the cylinder heads 5a, 5b between the mounting surface for the collector parts 9a, 9b and the mounting surface for the branch parts 10a, 10b of the bracket 18 that supports the valve shaft 11c, The connection between the valve shaft lie and lla, llb becomes smooth, and the throttle valves 7a, 7b can be opened and closed smoothly.

When opening the throttle valves 7a, 7b by depressing the accelerator pedal from the fully closed state of the throttle valves 7a, 7b, the rotational torque of the valve shaft 11c is transferred from the locking lever 27 of the locking portion 24 to the holding lever 2 via the stopper bin 30.
8b, and the valve shafts 11a and llb are rotated. In this case, even if a torque reaction force acts in the locking direction of the locking portion 24, the ball portion 25 of the ball bearing portion 23 and the ball portion 11b are rotated. Since the gap y in this direction with respect to the portion 26 is small, backlash at the initial stage of rotation can be minimized.
This ensures smooth rotation of the throttle valves 7a, 7b.

Further, the pedal force of the accelerator pedal is applied to the throttle drum 12 via the throttle wire 13, and the valve axis
Even if a bending force is applied to the valve shaft 11c, the valve shaft 11c rotates smoothly because it is supported by the U-shaped bracket 18 via the bearings 20a and 20b.

The mutual opening relationship of the throttle valves 7a and 7b can be determined by operating the two adjustment screws of the locking part 24, and adjusting the opening degree between the valve shafts 11c and ll.
By adjusting the rotation angle position of a or llb,
The opening degrees of both throttle valves 7a and 7b can be matched accurately. This prevents variations in the amount of intake air between banks, avoids deterioration of engine performance due to output imbalance, and also provides negative pressure signals for the EGR valve and canister valve that are opened near the throttle valves 7a and 7b. Accurate negative pressure can also be transmitted to the passage to improve exhaust performance.

The stopper pin 30 facing the adjustment screw 29 is always urged toward the locking lever 27 by the spring 32, so it automatically pushes the locking lever 27 by following the movement of the two N adjustment screws back and forth. It is brought into close contact with the adjustment screw 29.

By the way, this throttle valve drive device is assembled as follows.

First, the bracket 18 with the valve shaft ie attached is attached to the branch parts 10a, 10b of the intake manifolds 8a, 8b.
Temporarily fasten to the boss portions 17a, 17b, etc. with bolts.

The dowel collars 16 are press-fitted into the throttle chambers 6a and 6b, and inserted into the mounting surfaces of the collector parts 9a and 9b via the dowel collars 16. At this time, the ball receiving part 2
3 to temporarily connect the valve shaft 11c and the valve shaft 11a or 1.1b. When the throttle chambers 6a and 6b are firmly fixed, the dowel collar 16 positions them, so the valve shafts 11a and l
lb is correctly placed on the same axis in the horizontal direction.

Adjust the position of the temporarily fixed bracket 18 vertically and horizontally within the allowable range of the blank hole 21, and align the axis of the valve shaft 11C.
Correctly match the valve shafts 11a and llb on both sides, and then tighten firmly.

In this way, the valve shaft 11a, ll divided into three parts
b, llc can be connected to each other and assembled to the intake manifold accurately and efficiently.

(Effects of the Invention) As described above, according to the present invention, even if there are accuracy errors or installation errors on the throttle chamber mounting surface, the valve shaft supporting the throttle valve can rotate smoothly, and the throttle valve can smoothly rotate. Guaranteed opening and closing. In addition, the opening of the throttle I/le valve can be easily adjusted, and by accurately matching the opening of the left and right throttle valves, it is possible to prevent output imbalance between each bank and achieve good driving performance, as well as exhaust performance. It can also be improved.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of the present invention, and Fig. 2 is its A.
-All sectional view, Fig. 3 is a perspective view of the upper part of the cylinder head, Fig. 4 is a perspective view of the intake manifold, Fig. 5 is a partial sectional view thereof, Fig. 6 is a front view of the valve shaft drive section, Fig. 7 is a perspective view of the upper part of the cylinder head. Figure 8 is a front view of the connection part of the valve shaft, Figure 9 is a plane view, Figure 10 is a cross-sectional view of the ball holder, and Figure 11 is an enlarged view of a portion thereof. FIG. 12 is a perspective view, FIG. 13 is a plan view of the conventional example, and FIG. 14 is a sectional view showing a part of the throttle chamber. 1 a, 1 b...Bank, 5a, 5b...Cylinder head, 6a, 6b...Throttle chamber, 7
a, 7b...throttle valve, 8a, 8b...intake manifold, 9a. 9b... Collector part, 10a, 10b... Branch part, 11a, 1 lb, 11e... Valve shaft, 12.
...Throttle drum, 16...Dowell collar, 1
7a, 17b...Boss part, 18...Bracket, 2
3... Ball holder part, 24... Locking part, 25... Upper part,
25a...Flat part, 25b...Curved surface part, 26...
Receiving part, 26a... circular recess, 27... locking lever,
28a, 28b...holding lever, 29...adjustment screw, 30...stopper bin. Patent Applicant: Nissan Motor Co., Ltd. Gu Hyakuno Ensho Figure 1 Figure 4 Figure 6b Figure 5 15 6b /6 8b
Figure 6 Figure 7 Figure 8 Figure 9 Figure 1O Figure 1I Figure 13 Figure 14 Procedural amendment (method) 1. Indication of the case 1999 Patent Application No. 32238 2 Name of the invention ■ Type internal combustion Engine throttle valve drive device 3, relationship with the case of the person making the amendment Patent applicant address: 2 Takaracho, Kanayō-ku, Yokohama, Kanagawa Prefecture Name (
399) Nissan Motor Co., Ltd. 4, Agent May 15, 1999 (Start date: May 30, 1999) 6
, Drawing subject to correction 7, Contents of correction

Claims (1)

[Claims] A collector section of the intake manifold is arranged above the cylinder head of each bank configured in a V shape, and branch sections branched from these collector sections are connected to respective predetermined cylinders. In a throttle valve driving device for a V-type internal combustion engine, the throttle valve driving device for a V-type internal combustion engine is provided with a throttle chamber and transmits the depression force of an accelerator pedal to a throttle valve housed in each throttle chamber. 1. A second valve shaft and a third valve shaft located between them and rotatably supported by some of the branch parts are arranged substantially coaxially, and the third valve shaft While installing the throttle drum to which the throttle wire is connected, the first and second valve shafts and the third valve shaft can be adjusted at uneven positions from the ball bearing part and the shaft center, where they are inserted into contact on the same axis with each other. The ball receivers are connected to each other via a locking portion that locks, and the ball receiving portions are connected to each other through a locking portion that locks the cylinder head at a substantially fully closed position of the throttle valve. 1. A throttle valve drive device for a V-type internal combustion engine, characterized in that it comprises a receiving part having a circular recess for receiving the receiving part.