JPH07189728A - Vehicular engine-driven vacuum pump device fitting structure - Google Patents

Abstract

PURPOSE:To improve the mounting performance of a vacuum pump while suppressing the quantity of change to a small degree. CONSTITUTION:A fuel injection pump is fixed through a fuel injection pump bracket 4, with the input shaft thereof facing the transmission side. The fuel injection pump and a camshaft are connected in the power transmissible state. Spacers formed of plural stud bolts 8 are provided protruding from the fuel injection pump bracket 4. A vacuum pump 10 is fixed to the tip parts of plural stud bolts 8. A timing pulley 11 is fitted to the input shaft of the vacuum pump 10, and a timing belt 7 is wound onto the timing pulley 11 so as to enable power transmission from the camshaft to the vacuum pump 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for mounting an engine driven fuel pump or a negative pressure pump.

[0002]

2. Description of the Related Art Conventionally, engine-driven negative pressure pumps are
For example, pulleys are attached to the shaft end portions of the input shaft and the crankshaft, and an accessory belt is wound between the pulleys to drive the belt. However, in the mounting structure of the negative pressure pump that takes the driving force from the crankshaft using the accessory belt, since the accessory belt is exposed to the outside, it is exposed to water oil and the like, belt slip, etc. Relatively easy to occur.

Therefore, as described in Japanese Patent Laid-Open No. 2-207141, the negative pressure pump is attached to the engine in such a structure that the driving power of the negative pressure pump is taken directly from the engine without the aid of an accessory belt. Is also considered. For example, in the negative pressure pump mounting structure described in Japanese Patent Application Laid-Open No. 2-207141, the crankshaft of the vehicle engine and the input shaft of the fuel injection pump mesh with each other via an external gear to put them in a gear transmittable state. In addition to being configured, the input shaft of the fuel pump and the input shaft of the negative pressure pump are configured to be meshed with each other via another external gear to enable gear transmission. Further, both the fuel injection pump main body and the negative pressure pump main body are integrally fixed to the gear box, and the negative pressure pump is fixed to the engine by fixing the gear box to one side surface of the cylinder block. It is installed.

Then, the driving force of the crankshaft is directly input to the negative pressure pump by gear transmission to drive the negative pressure pump.

[0005]

However, in the above-mentioned conventional mounting structure of the engine-driven negative pressure pump device for a vehicle, in the mounting structure of the negative pressure pump that takes the driving force by gear transmission, the driving force is taken out from the cylinder block. Therefore, it is necessary to drastically change the shape including the cylinder block, and when mounting on the front side of the engine, it is often difficult to secure a space due to the relationship with other auxiliary machines.

The present invention has been made in view of the above problems, and is characterized in that the mountability of the negative pressure pump is improved while the amount of change is kept small.

[0007]

In order to achieve the above object, a mounting structure for a vehicle engine-driven negative pressure pump device according to the present invention is provided with an intake / exhaust valve camshaft and a fuel injection pump for each cylinder. The fuel injection pump is fixed via a fuel injection pump bracket fixed to the side surface of the cylinder block of the engine with the input shaft facing the transmission side, and the input shaft of the fuel injection pump and the shaft of the cam shaft are fixed. In a fuel injection type engine in which a timing belt is wound around the end portion and a belt is driven, a spacer is provided on the transmission side of the fuel injection pump bracket, and a negative pressure pump is provided on the tip end side of the spacer, It is characterized in that the input shaft of the negative pressure pump is wound around the timing belt to drive the belt.

At this time, the installation position of the negative pressure pump is
It may be set at a position higher than the installation position of the fuel injection pump.

[0009]

According to the mounting structure of the vehicle engine driven negative pressure pump device of the present invention, a part of the fuel injection pump bracket is used in the belt width direction by using the spacer without changing the engine housing such as the cylinder block and the cylinder head. Since it has a structure in which the negative pressure pump is attached to the end thereof, only a small scale modification of the fuel injection pump bracket is required, and the strength and rigidity necessary for attaching the negative pressure pump are secured.

Further, since the input shaft of the negative pressure pump is connected to the cam shaft via the timing belt, it is possible to change the setting of the diameter of the pulley attached to the input shaft of the negative pressure pump.
It is possible to set the speed increase adjustment of the rotation speed input to the input shaft of the negative pressure pump. Therefore, the negative pressure pump can be downsized with respect to the required pump capacity. Also, the negative pressure pump can be set to the same position as the position where it is attached to the belt cover, but since the belt cover does not need to have high strength or synthesis, it can be made of resin or the like. Therefore, it is possible to prevent the vibration of the negative pressure pump from being directly transmitted to the belt cover.

Further, as described in claim 2, the negative pressure pump is set at a position higher than the fuel injection pump and on the opposite side of the fuel injection pump with the timing belt interposed therebetween. The space above the transmission with plenty of space can be used.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings in FIGS. First, the structure will be described. An output side end of a crank shaft (not shown) projects from an engine cylinder block, and a flywheel is attached to the output side end, and is connected to a transmission TM via a clutch mechanism CL or the like. , Configured to drive the transmission.

Further, the cylinder head 1 of the engine is
A cam shaft 2 for opening / closing the intake / exhaust valves in each cylinder is supported in parallel with the crank shaft. An endless annular chain is wound between a small-diameter sprocket attached to the shaft end opposite to the output side of the crankshaft and a large-diameter sprocket attached to the shaft end of the camshaft 2 to form a crank. The cam shaft 2 is driven from the shaft.

Further, the fuel injection pump 3 is arranged so that its input shaft faces the transmission side, and is fixed to a fuel injection pump bracket 4 fixed to a side surface of the engine cylinder block near the transmission side. . Then, the input shaft 3a of the fuel injection pump 3
A timing pulley 6 is attached to the. The transmission-side shaft end of the cam shaft 2 projects rearward from the cylinder head, and the timing pulley 5 is attached to the shaft end. An endless annular timing belt 7 is wound around the timing pulley 5 of the cam shaft 2 and the timing pulley 6 of the input shaft 3a of the fuel injection pump 3 so that the fuel injection pump 3 can be driven from the cam shaft 2.

Further, a plurality of stud bolts 8 as spacers in the fuel injection pump bracket 4 located at an intermediate portion sandwiched between the timing pulleys 5 and 6 are positioned so as not to interfere with the timing belt 7 on the transmission side. The negative pressure pump 10 is fixed to the tips of the plurality of stud bolts 8. That is, the negative pressure pump 1
0 is arranged on the opposite side of the fuel injection pump 3 with the timing belt 7 interposed therebetween, and its input shaft 10a is parallel to the input shaft of the fuel injection pump 3 in a state of protruding toward the cylinder head 1. And a small-diameter timing pulley 11 is attached to the timing pulley 11.
Also, the power can be transmitted from the cam shaft 2 to the negative pressure pump 10 by being wound around the timing belt 7.

Reference numeral 12 is a tension pulley,
It is for adjusting the tension of the timing belt 7. Further, a belt cover 13 is attached so as to cover the timing belt 7, is fixed to the cylinder head 1 via a back plate 9, and an engaging hole 13a through which the negative pressure pump 10 can project is formed. The negative pressure pump 10 is inserted into the engaging hole 13a.

In the structure of the above embodiment, the rotation of the crankshaft is transmitted to the camshaft 2 via the chain, and the rotation of the camshaft 2 is further transmitted via the timing belt 7 to the fuel injection pump 3 and the negative pressure. It is transmitted to the pump 10. As described above, the structure is such that the stud bolt 8 is projected from the fuel injection pump bracket 4 and the negative pressure pump 10 is attached to the fuel injection pump bracket 4 without changing the shape of the cylinder head 1 and the like. Only by doing so, the negative pressure pump 10 can be attached, and the strength and rigidity required for the attachment of the negative pressure pump 10 can be secured.

Therefore, in addition to being advantageous in cost,
The member required for mounting the negative pressure pump becomes small, which is advantageous in terms of weight. In addition, as described above, the negative pressure pump 1
By setting the diameter of the timing pulley 11 fitted to the zero input shaft 10a to a small value, the input shaft 1 of the negative pressure pump 10 is
Since the rotational speed of 0a is increased, the main body of the negative pressure pump 10 can be downsized to the required pump capacity.

Further, the negative pressure pump 10 has a belt cover 13
Therefore, the vibration of the negative pressure pump 10 is not directly transmitted to the belt cover 13. For this reason,
It is avoided that the belt cover 13 directly vibrates due to the vibration of the negative pressure pump 10 to generate noise. Further, by disposing the negative pressure pump 10 on the opposite side of the fuel injection pump 3 and the timing belt 7 and at a position higher than the fuel injection pump 3, a relatively large space is available. The negative pressure pump 10 is arranged above a certain transmission to improve mountability.

In the above embodiment, the fuel injection pump bracket 4 is extended upward in order to set the position of the negative pressure pump 10 to a position higher than that of the fuel injection pump 3. The fuel injection pump bracket 4 may be extended laterally in accordance with the above. In the above embodiment, the negative pressure pump 10 is directly attached to the tip of the stud bolt 8 serving as a spacer. However, the attachment plate is fixed to the stud bolt 8 and the negative pressure pump 10 is fixed to the attachment plate. You may do so.

Although the stud bolt 8 is used as the spacer in the above embodiment, the spacer is limited to the stud bolt 8 such that the spacer is integrally formed with the fuel injection pump bracket 4 in advance. is not.

[0022]

As described above, in the structure for mounting the engine-driven negative pressure pump device for a vehicle of the present invention, while securing the strength and rigidity required for mounting the negative pressure pump,
The negative pressure pump can be fixed to the engine through a small number of members, which is advantageous in terms of weight and cost.

Further, since the power transmission to the negative pressure pump is belt conduction, the rotational speed of the negative pressure pump can be increased by changing the setting of the pulley diameter. As a result, the negative pressure pump can be downsized with respect to the required pump capacity. Further, the mounting position of the negative pressure pump can be set to the same position as when the negative pressure pump is supported by the belt cover. At this time, it is possible to avoid directly transmitting the vibration of the negative pressure pump to the belt cover, and the belt cover can be made of a lightweight member such as resin as in the conventional case.

Further, when the negative pressure pump device is attached as described in claim 2, it is located at a position opposite to the fuel injection pump with the timing belt interposed therebetween and above the transmission having a relatively large space. A negative pressure pump can be installed, which improves the mountability.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the attachment of a negative pressure pump to a fuel injection pump bracket according to an embodiment of the present invention.

FIG. 2 is a view from the transmission side showing the relationship of each member in the mounting structure of the vehicle engine-driven negative pressure pump device according to the embodiment of the present invention.

FIG. 3 is a side view showing the relationship of each member in the mounting structure for the vehicle engine-driven negative pressure pump device according to the embodiment of the present invention.

FIG. 4 is a plan view showing the relationship of each member in the mounting structure of the vehicle engine-driven negative pressure pump device according to the embodiment of the present invention.

[Explanation of symbols]

 1 Cylinder Head 2 Cam Shaft 3 Fuel Injection Pump 4 Fuel Injection Pump Bracket 5 Timing Pulley 6 Timing Pulley 7 Timing Belt 8 Stud Bolt (Spacer) 10 Negative Pressure Pump 11 Timing Pulley

Claims (2)

[Claims] 1. A fuel injection system comprising an intake / exhaust valve cam shaft and a fuel injection pump for each cylinder, wherein the fuel injection pump is fixed to a side surface of a cylinder block of an engine with its input shaft facing the transmission side. A fuel injection engine in which a fuel injection pump is fixed via a pump bracket, and a belt is driven by wrapping a timing belt around the input shaft of the fuel injection pump and the shaft end of the cam shaft. A vehicle is characterized in that a spacer is provided on the negative pressure pump, a negative pressure pump is disposed on the tip side of the spacer, and the input shaft of the negative pressure pump is wound around the timing belt to drive the belt. Mounting structure for engine-driven negative pressure pump device. 2. The mounting of the engine driven negative pressure pump device for a vehicle according to claim 1, wherein the position of the negative pressure pump is set higher than the position of the fuel injection pump. Construction.