JPH03134282A - Oil pump for vehicle - Google Patents

Abstract

PURPOSE:To prevent deterioration of driving efficiency of an engine with a number of constitutional part items decreased and constitution in an engine room simplified by providing a pump driving mechanism part in which a drive shaft of a pump main unit is connected to a drive shaft end part of the engine and directly driven. CONSTITUTION:A constitution is provided such that a drive shaft 26 of a pump main unit 23 is connected to the end part of a crankshaft 22 of an engine and directly driven integrally with the crankshaft 22 at the time of driving the engine. In this way, a constitutional part for transmitting driving power of the engine can be omitted with the constitution made possible to reduce a number of constitutional part items while to simplify a constitution in an engine room as compared with that in the past. Also by eliminating the possibility of inputting a load by tension of a belt or the like as in the past to the crankshaft 22 of the engine, driving efficiency of the engine can be prevented from deteriorating by preventing an increase of friction force which acts on the main bearing 76 of the engine.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an improvement in a vehicle oil pump that generates drive oil pressure for driving, for example, a vehicle power steering device.

(Prior Art) Generally, hydraulic control devices such as a power steering device, a four-wheel steering system (4WS), an anti-skid brake system (ABS), a suspension control device, etc. are installed in vehicles such as automobiles. are increasing. The hydraulic circuits of these hydraulic control devices are formed by an independent vehicle oil circulation path different from the engine oil circulation path. An oil pump is interposed in this hydraulic circuit, and each of these hydraulic control devices is driven by the working hydraulic pressure fed from this oil pump.

Incidentally, vane-type oil pumps as shown in FIGS. 4 and 5 have been known for some time now as this type of oil pump. In this case, a cam ring 2 is installed inside the pump body 1. A rotor 3 is rotatably mounted inside the cam ring 2. Furthermore, a plurality of vanes 4 are attached to the outer circumferential portion of the rotor 3 so as to be projectable and retractable in the radial direction. Furthermore, inside the pump body 1, there are a cam ring 2, a rotor 3, and a vane 4.
...An oil chamber 5 is formed between them. And rotor 3
By causing the vanes 4 to protrude and retract along the cam curved surface of the cam ring 2 as the pump rotates, oil is sucked from the oil reserve tank (not shown) into the oil chamber 5 through the suction port of the pump body 1, and this pump A pump action is performed to discharge the liquid to the outside through the discharge boat of the main body 1.

Further, a pulley 7 is attached to the shaft end of a drive shaft 6 that rotationally drives the rotor 3 . This pulley 7 is connected via a belt 10 to a crankshaft pulley 9 fixed to the crankshaft of an engine 8, as shown in FIG. The rotor 3 of the pump body 1 is driven to rotate. In FIG. 6, 11 is an alternator drive pulley, 12 is a tension pulley, 13 is an air conditioner compressor drive pulley, 14 is a drive belt installed between this drive pulley 13 and the crankshaft pulley 9, 15 is the tension of this drive belt 14.

(Problems to be Solved by the Invention) In the conventional configuration described above, the driving force of the engine 8 is transmitted to the pulley 7 of the pump body 1 via the belt 10, so the pump body 1 is placed on the side of the vehicle body. For installation, use a bracket or belt 10. The pulley 7, the tension pulley 12, and their attachment require a large number of components such as bolts, complicating the structure and increasing costs. Furthermore, when the belt 10 is used for a long period of time, there is a risk of slippage or breakage due to wear, which poses a problem in improving reliability.

Furthermore, since there is a risk that a load due to the tension of the belt 10 will be input to the crankshaft of the engine 8, there is a risk that the frictional force acting on the main bearing of the engine 8 will increase, and the driving efficiency of the engine 8 may decrease. there were. moreover,
Since the engine and a large number of various auxiliary equipment are installed in the limited internal space of the engine room, there is a problem in that the installation of the oil pump in the engine room is restricted in its position. There was a problem that it was difficult to install the pump.

This invention has been made with attention to the above circumstances, and therefore it is possible to reduce the number of component parts, simplify the configuration in the engine room, and improve reliability, thereby making it possible to reduce the number of component parts and simplify the structure inside the engine compartment. It is an object of the present invention to provide a vehicle oil pump that can prevent a decrease in drive efficiency.

[Structure of the Invention] (Means for Solving the Problems) This invention provides a drive shaft of a pump body that is interposed in a vehicle oil circulation path that is different from an engine oil circulation path and is connected to an engine drive shaft end. A pump drive mechanism is provided, which is connected to the pump body and directly drives the drive shaft of the pump body by the drive shaft of the engine.

(Function) When the engine is driven, the drive shaft of the pump body is directly driven integrally with the drive shaft of the engine.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

FIG. 1 and FIG. 2 show the main structure of an oil pump. In FIGS. 1 and 2, 21 is an engine;
22 is a crankshaft of this engine 21, and 23 is a main body of an oil pump interposed in an independent vehicle oil circulation path different from the engine oil circulation path.

Further, the casing of this pump body 23 is formed by a pump housing 24 and a cover 25. Furthermore, through holes 24a and 24b are formed in the axial center of the pump housing 24 and the -h bar 25, respectively.

The drive shaft 26 of the pump body 23 is mounted in these through holes 24a, 24b in an N-inverted state. The drive shaft 26 is connected to the shaft end of the crankshaft 22 of the engine 21, forming a pump drive mechanism in which the crankshaft 22 of the engine 21 directly drives the drive shaft 26 of the pump body 23. In this case, at the shaft end of the crankshaft 22, for example, a sprocket 28 for driving the Kotorad belt 2, which is a toothed belt that rotationally drives the camshaft of the valve mechanism, is attached together with the drive shaft 26 of the pump body 23 by a common key 29. Fixed. In this case, both ends of the pump drive shaft 26 have engagement recesses 26a at the shaft center, respectively.
26b is formed. And this pump drive shaft 2
Engagement recess 26 on the inner end side on the crankshaft 22 side in 6
The shaft end of the crankshaft 22 is removably inserted into a,
In this state, the sprocket 28 and the sprocket 28 are prevented from rotating relative to the crankshaft 22 by a common key 29.

Further, a plurality of fixing bolt receiving portions 30 are protruded from the pump housing 24 of the pump body 23. Bolt insertion holes 3 formed in these bolt receiving parts 30...
1, a fixing bolt 32 is inserted into it. The fixing bolt 32 is screwed into a bolt hole 34 formed in a front case 33 or the like of the engine 21, and the pump housing 24 is removably attached to the engine 21 side. Furthermore, the cover 25 is attached to the fixing bolt 3
5, it is removably attached to the pump housing 24.

On the other hand, inside the pump body 23, there is a pump housing 24.
A cam ring 36 is formed on the inner surface of the cam ring 36. Inside this cam ring 36 is a rotor 37 and a side plate 3.
8 is installed. This rotor 37 is connected to the pump body 23
For example, the drive shaft 26 is spline-fitted to the drive shaft 26, and is driven to rotate integrally with the drive shaft 26. Furthermore, the side plate 38 is fitted and fixed to the inner surface of the pump housing 24.

Further, a plurality of vanes 39 are provided on the outer circumference of the rotor 37.
... is installed so that it can be protruded and retracted in the radial direction.

In addition, these cam rings 3 are installed inside the pump body 23.
6. An oil chamber 40 is formed between the rotor 37 and the vane 39. Furthermore, this pump body 23 has a third
As shown in the figure, each pair of suction ports 41.41 and discharge boats 42.42 are formed. As the rotor 37 rotates, the vanes 39 are moved to protrude and retract along the cam curved surface of the cam ring 36, so that the pump body 23 is pumped from an oil reserve tank (not shown).
Oil is sucked into the oil chamber 40 through the suction boat 41.41 of the pump body 23, and the oil is sucked into the oil chamber 40 through the suction boat 41.41 of the pump body 23.
A pumping action is performed to discharge water to the outside through the pump.

In addition, the engagement recess 2 at the external extending end of the pump drive shaft 26
6b is the central shaft portion 4 of the outer pulley 43 for driving auxiliary equipment.
4 is removably inserted.

In this case, a knock pin 45 is inserted into the joint between the central shaft portion 44 of the driving pulley 43 and the externally extending end portion of the pump drive shaft 26, and the knock pin 45 prevents rotation between the two. .

Further, a fixing bolt 46 is attached to the central shaft portion 44 of the pulley 43.
A portion 47 is formed for attachment. In this case, pulley 4
A bolt insertion hole for the fixing bolt 46 is provided in the center shaft portion 44 of the pump drive shaft 26 and the center shaft portion of the pump drive shaft 26, and a bolt hole 48 for screwing with the fixing bolt 46 is provided in the shaft end of the crankshaft 22.
are formed respectively. And this fixing bolt 4
6, the pulley 43, pump drive shaft 26, and sprocket 28 are integrally fixed to the shaft end of the crankshaft 22, and as the crankshaft 22 of the engine 21 rotates, the sprocket 28, pump drive shaft 26, pulley 43, etc. An integral rotation section 49 is provided that integrally rotates the components. Further, an inner pulley 5o is fixed to the inner end surface of the pulley 43 by a fixing bolt 51. This inner pulley 50 is arranged at a position surrounding the pump housing 24 of the pump body 23. Note that a drive belt for driving an air conditioner, for example, is wound around the outer pulley 43, and a drive belt for driving an alternator, for example, is wound around the inner pulley 50.

Further, the pump housing 24 is provided with a floating bearing portion 52 that supports the pump drive shaft 26 so as to be elastically displaceable in the radial direction. The floating bearing portion 52 is formed of, for example, a metal ring member 53 and an O-link 54, and supports the pump drive shaft 26 so as to be elastically displaceable in the radial direction as the O-ring 54 is elastically deformed. It has become.

Furthermore, the pump drive shaft 26 through-holes 24a, 2
Oil seals 55 and 55 (respectively) are attached to the outer end of the inner circumferential surface of the pump body 5a at the joint surface with the pump drive shaft 26 to prevent oil leakage from the pump body 23.

Further, the pump housing 24 is provided with a control valve 56 for controlling the operation of the pump body 23. This control valve 56 is connected to the cam ring 36 of the pump body 23,
As shown in FIG. 2, the rotor 37, the vanes 39, and other pump mechanism parts are arranged at a position separated from each other by an appropriate distance in the direction of the shaft end of the crankshaft 22. Furthermore, a discharge oil passage 58 through which hydraulic oil discharged from the pump body 23 side flows into the valve body 57 of the control nozzle (lube 56).
The mounting holes 60 for the flow rate control spool 59 are formed substantially parallel to each other. These discharge oil passages 58 and spool mounting holes 60 extend approximately in the radial direction of the pump drive shaft 26, as shown in FIG.
The cocked belt 27 is placed at a position to avoid interference with the cocked belt 27 wrapped around the belt.

Further, the valve end oil chamber 61 on the pump drive shaft 26 side of the control valve 56 is connected to the discharge portion side of the pump body 23. The valve end oil chamber 61 communicates with the inner end portions of the discharge oil passage 58 and the spool mounting hole 60, respectively. The outer end of the discharge oil passage 58 is connected to a connecting pipe of an external device such as a power steering device (not shown). Further, a closing cap 62 is screwed onto the outer end of the spool mounting hole 60, and the outer end of the spool mounting hole 60 is closed by the closing cap 62.

Further, the spool 59 is provided inside the spool mounting hole 60.
is slidably attached. This spool 59 has a protruding portion 63 formed on the inner end side and a spring receiving portion 64 on the outer end side. Furthermore, inside the spool mounting hole 60, a closing gear knob 62 and a spring receiving portion 64 of the spool 59 are provided.
A spring member 65 formed by a coil ζf spring between
is installed. The spool 59 is always biased by the biasing force of the spring member 65 in a direction in which the protruding portion 63 is brought into contact with a stopper portion 66 formed in the oil chamber 61 on the end surface of the lubricant. A discharge oil outlet 67 that is opened and closed by the spool 59 is formed in the peripheral wall surface of the hole 60 .

This discharge oil outflow port 67 is connected to one end portion of a space passageway 68 (for discharge oil flow). The other end of this bypass passage 68 is connected to the suction port 4 of the pump body 23.
It is connected to the first side.

Further, an orifice 69 is provided in the discharge oil passage 58 to narrow down the area of the flow passage. One end of a communication passage 70 is connected to the downstream side of the orifice 69 in the discharge oil passage 58 . The other end of this communication path 70 is the spool mounting hole 6
0 on the closing cap 62 side. The hydraulic pressure on the upstream side of the orifice 69 acts on the inner end surface of the spool 59 in the spool mounting hole 60, and the hydraulic pressure on the downstream side of the orifice 69 acts on the outer end surface of the spool 59. The spool 59 in the spool mounting hole 60 moves along the spool mounting hole 60 in accordance with the differential pressure between the upstream and downstream sides of the orifice 69.

Therefore, this control valve 56 has a spool mounting hole 6.
With the operation of the spool 59 in 0, the bypass passage 68
A flow rate control mechanism section 71 is formed to open and close the discharge oil outlet 67 to control the flow rate of oil discharged from the discharge oil passage 58 to a constant level.

Note that 72 is a suction nozzle of the pump body 23, and this suction nozzle 72 is connected to the oil reserve tank side via a connecting pipe. Further, 73 is an oil pan of the engine 21, 74 is a tension pulley of the tightened belt 27, 75 is an oil pump interposed in the engine oil circulation path, and 76 is a main bearing of the crankshaft 22.

Next, the operation of the above configuration will be explained.

First, when the engine 21 is in operation, the crankshaft 22, the pump drive shaft 28, the pump drive shaft 26, the pulleys 43, 50, and other integral recirculating parts 49 are rotated together. In addition, as the pump drive shaft 26 rotates, the vane 3 moves without any movement during rotation of the rotor 37.
9... are projected and retracted along the cam curved surface of the cam ring 36. In this case, there is no rotational movement of the rotor 37 in the oil chamber 40 between the cam 1 nong 36, the rotor 37, and the vane 39. Connecting pipe from oil reserve tank, suction nozzle 72 of pump body 23, suction boat 4
1. Oil force is sucked into the oil chamber 40 sequentially through 41. The high-pressure discharge oil compressed in this oil chamber 40 passes through the discharge bows 42, 42 of this pump body 23, the knob end face oil chamber 61 of the control valve 56, and the discharge oil passage 58 to the outside. The equipment's connecting piping (this is where a series of pump actions are performed).

Also, during operation of this pump body 23, the spool mounting hole 6
The spool 59 in the flow control mechanism 71 moves along the spool mounting hole 60 according to the differential pressure between the upstream and downstream sides of the orifice 69 of the flow control mechanism section 71. In this case, when the flow rate of oil discharged from the pump body 23 is small, the spool 59 is moved by the spring member 65.
The protruding portion 63 is held in a biased state by the biasing force in a direction to bring it into contact with the stopper portion 66 of the valve end oil chamber 61. In this state, the discharge oil outlet 67 of the bypass passage 68 is held in a closed state by the spool 59, so that all the discharge oil from the pump body 23 is forced to the outside via the discharge oil passage 58.

Furthermore, as the flow rate of the oil discharged from the pump body 23 increases, the differential pressure between the upstream and downstream sides of the orifice 69 increases.
Move away from 1. As the spool 59 moves within the spool mounting hole 60, the discharge oil outlet 67 of the bypass passage 68 is opened. When the discharge oil outlet 67 is opened in this manner, the high pressure oil in the valve end oil chamber 61 is introduced into the suction port 41 of the pump body 23 on the low pressure side through the bypass passage 68.

Therefore, when the flow rate of discharged oil from the pump body 23 increases, unnecessary discharged oil is removed from the bypass passage 6 in the pump body 23.
Since the oil can be circulated through the discharge oil passage 58, the flow rate of oil discharged from the discharge oil passage 58 can be controlled to be constant.

Therefore, in the above configuration, the drive shaft 26 of the pump body 23 is connected to the shaft end of the crankshaft 22 of the engine 21, and when the engine 21 is driven, the pump body 26 is integrally connected to the crankshaft 22 of the engine 21. Since the drive shaft 26 of the engine 21 is directly driven, the belt 10, pulley 7, and
Tension pulleys 12 and their attachment can eliminate numerous components such as bolts.

Therefore, the number of component parts can be reduced compared to the past, and the configuration inside the engine room can be simplified. Furthermore, since there is no need to use the belt 10, there is no risk of slippage or breakage due to wear of the belt 10 as in the conventional case, and reliability can be improved. In addition, since there is no possibility that the crankshaft 22 of the engine 21 is subjected to a manual load due to the tension of the belt 10, the engine 21
It is possible to prevent an increase in the frictional force acting on the main bearing 76 of the engine 21, thereby preventing a decrease in driving efficiency of the engine 21. Furthermore, since the pump body 23 can be attached to the shaft end of the crankshaft 22 of the engine 21, it is easy to install another oil pump in a limited internal space in the engine room. A new oil pump can be installed.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[Effects of the Invention] According to the present invention, the drive shaft of the pump body, which is interposed in the vehicle oil circulation path that is different from the engine oil circulation path, is connected to the end of the engine drive shaft, and the engine A pump drive mechanism is provided that directly drives the drive shaft of the pump body, which reduces the number of component parts, simplifies the configuration inside the engine room, and improves reliability. It is possible,
A decrease in engine drive efficiency can be prevented.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of this invention.
Fig. 1 is a cross-sectional view showing a schematic configuration of the main parts of the oil pump, Fig. 2 is a longitudinal sectional view thereof, Fig. 3 is a schematic configuration diagram for explaining the pumping action of the oil pump, and Figs. 6
The drawings show a conventional example; FIG. 4 is a longitudinal cross-sectional view of the oil pump, FIG. 5 is a cross-sectional view thereof, and FIG. 6 is a schematic configuration diagram for explaining the driving state of the oil pump. 21... Engine, 22... Crankshaft, 23-...
・Pump body, 26... Drive shaft.

Claims (1)

[Claims] A vehicle oil pump in which a pump body is interposed in an independent vehicle oil circulation path different from an engine oil circulation path, and the pump body pumps vehicle oil into the circulation path. 1. A vehicle oil pump, comprising: a pump drive mechanism that connects a drive shaft to an end of the drive shaft of an engine, and causes the drive shaft of the engine to directly drive the drive shaft of the pump body.