JPS59194092A - Excessive lubricant pumping prevension mechanism for swash plate compressor - Google Patents

Abstract

PURPOSE:To prevent excessive pumping of oil under high speed rotation, by providing a cover body for an oil pump while splitting back and for into plural cover chips while arranging a spring for energizing both cover chips tightly. CONSTITUTION:Upon increase of rotation of a drive shaft 2, the pumping capacity of an oil pump P will increase to increase suction of oil for the oil pump P while the delivery is limited by the diameter of an oil feed path 27 to cause unbalance between the suction and delivery thus to cause the pressure increase in a delivery groove 26. When said pressure exceeds over the setting pressure of a spring 28, the body section 24A of the cover body 24 will move toward a rear housing 15R to produce a gap between the body section 24A and the rear end face of the oil pump P to release pressure in said groove 26.

Description

Detailed Description of the Invention Technical Field The present invention relates to a lubricating oil supply mechanism in a swash plate compressor, and more specifically to a lubricating oil supply mechanism for a swash plate compressor, which stores oil in a mail pan formed at the bottom of the compressor. The thrust bearing of the swash plate, which is pumped up by a pump and mounted on the rotating shaft, relates to a lubricating oil supply mechanism provided to lubricate the part by forcibly feeding the thrust bearing to the part.

BACKGROUND TECHNOLOGY In general, in a swash plate compressor, a swash plate is mounted on a rotary shaft so that it can swing freely, and the pistons inserted into each cylinder bore reciprocate through the oscillating rotation of the swash plate. The bearing of the swash plate is provided so as to obtain a compression effect by moving the swash plate.As shown in Fig. 6, the bearing of the swash plate is one of the methods of supplying lubricating oil to the parts (the thrust bearing is the part). In other words, an oil pan (a) is provided at the bottom of the compressor, and the oil stored in the oil pan (a) is pumped up by an oil pump (C) provided at one end of the rotating shaft (b).
t~ through the oil supply passage (d) drilled along the center line of b)
Conventionally, the above-mentioned bearings are forcibly fed into the parts I'l, and the oil that has served the parts I'l is dropped into the swash plate chamber and returned to the oil pan. ing.

However, the above method has the following two points: (1) When the oil pump rotates at high speed, the rotation of the oil pump increases, and the amount pumped from the oil pan increases in proportion to the rotation of the oil pump. The oil pump discharges oil toward each bearing, and the amount of ground oil supplied is limited by the allowable amount in the oil supply passage.As a result, the discharge pressure increases, and the power consumption in the oil pump increases accordingly.

■ A portion of the oil that lubricates the parts of each bearing floats in the swash plate chamber in a spray state and flows out into the suction chamber along with blow-by gas, but the amount pumped up from the oil pan during high-speed rotation. As the amount of oil increases, the amount of oil flowing into the suction chamber increases in proportion to the increase, eventually causing the oil pan to become depleted.

The problem is that it causes problems such as.

OBJECTS OF THE INVENTION The present invention is an attempt to improve the conventional situation as described above, and an object of the present invention is to prevent excessive pumping of oil during high-speed rotation.

Structure of the Invention In other words, the present invention provides a cover that covers the oil pump so that it can be separated into the front and back, and is normally pressed tightly against the cover. The main feature of the present invention is that it prevents excessive oil pumping by applying a force of 1 t to the unit and disabling a part of the pumping function. In a compressor, a cover that covers the oil pump is divided into a plurality of cover pieces so that they can be separated back and forth, and a spring is attached to the cover piece to urge the double force bar pieces in the direction of close contact. The reason is that it is configured so that it can be used as an intermediary.

EXAMPLES Specific examples of the present invention will be described below with reference to illustrative drawings.

1 to 3 are drawings showing the first embodiment. In each drawing, (1) indicates a cylinder block. The same cylinder block (1) is a front blinder.
block (IF) and rear cylinder block (IR)
A front housing (15F) is joined to the opening on the front cylinder block (IF) side of the cylinder block (1), and a front pulp plate (], OF) is interposed at the joint. .

Further, the rear housing (15R) is joined to the opening on the rear cylinder block (IR) side, and a V-shaped valve plate (IOR) is interposed at the joint part.

A shaft hole (2)' is provided in the center of both cylinder blocks (IF) and (IR).
Radial bearing (L6) (1
6), the drive shaft (2) is rotatably supported. Drive shaft (2) housing (15F) 1i
An electromagnetic clutch (not shown) is provided at the protruding end of 11, and is capable of being connected and driven to an engine (not shown) through connection and disconnection of the electromagnetic clutch.

An appropriate number of bores (3
) is provided so as to surround the coaxial hole (2)'.

Each bore (3) is divided into a front and rear pair with a swash plate chamber (A) in between, and a double-headed piston (5) is fitted into each bore (3). A swash plate (6) is rotatably mounted on the drive shaft (2) in correspondence with the swash plate chamber (4). Thrust bearings (19) (19) are interposed between the inner wall surface and the inner wall surface.

The piston (5) is connected to the slope of the swash plate (6).
) is moored via the ball (7) and shoe (8),
The rocking rotation of the swash plate (6) is transmitted to each piston (5) as a reciprocating motion.

Also, in both cylinder blocks (IF) (IR), oil pan holes are provided located below the swash plate chamber (4).On the other hand, in both the housings (15F) (15R), the respective bores (3) are provided. The suction chamber (17F) (17R
) and the discharge chamber (18F) (18R) are provided concentrically with an annular partition between them.

And front valve plate (10F and Q:
IJ Yavalve Great (1, OR) has the above suction chamber (1
7F') (171e) and J11, the intake port (II
F) (11R) is also (1 (two monks (1,8F) (
1,81 included) and A4'' correspondingly discharge n (12F) (
'12R) is opened by person/z. And also the inlet (1)
, F) (IIR) (f Suction valve (13F) located on the moss bore (3) side (13R) t is Hi.

It is provided so that it can be opened and closed freely through the suction stroke of the stone (5), and a discharge chamber (18
F) (18R) @, located at 11 and discharge valve (14
F) (14R) is provided so as to be openable and closable via the exhaust stroke of the piston (5). Also, in the center of the rear cylinder block (1R) is the i! 11] Drive shaft (2
) A d6 nono chamber (9) is provided in correspondence with the rear end of the d6 nono chamber (9). The pump chamber (9) is equipped with an oil pump (■) mounted on the rear end of the drive shaft (2), and a cup (integral (2Il)) covering the oil pump (J. The integrated cover (24) covers the main body (24A) (one piece) that covers the outer periphery and rear end surface of the oil pump (P), and the front end surface of the oil pump (■゛). The lid body part (24B) is formed by being divided into two parts (cover pieces).A spring (28) is interposed between the main body part (24, A) and the llano housing (15R), and the main body Sound 1 ((24A,) and the lid body part (2'4.8) are in a close contact state') The O body part (24A) provided in the latch has 1 suction groove (25) between the oil pump and The discharge groove (26) is divided into two sections, and the suction groove (25) communicates with the mail nozzle (20) through the oil supply passage (22) bored in the beam cylinder block (JR). provided.

Further, a discharge passageway (27) is provided extending along the longitudinal center line of the drive shaft (2). Then, the injection hole (23) is branched and extended in the radial direction from an arbitrary position between the q points of the oil supply passage (27) (a position corresponding to the thrust bearing 09 discharge), and the tip of the injection hole (23) is branched and extended. is the above thrust bearing (1.”l) (1!
1) A woman who is connected with ``h'' is said to be relieved. Others (2
1) indicates a communication hole that communicates the swash plate chamber (4) with the suction chamber (17F).

Figures 4 and 5 are drawings showing the second embodiment, and show the configuration 1-) of the first embodiment; ) to J.

The spool (30) corresponds to the chamber (9), and the front and rear 11
・It is set up so that it can move forward and backward with one syllable in J, and the same Subu-/Shuku 3
0) and the discharge valve (14).
R) 75 through bolts (3 screws).

Also, the back of the spool (30) and the rear housing (15)
A pressure action chamber CE is provided between the pressure action chamber (31) and the inner wall surface of the pressure action chamber (31), and discharge pressure and suction pressure can be selectively supplied to the pressure action chamber (31) through the supply hole (33). provided as possible. And another hippo CI! 4) body part (24
A) and a spring (2 springs) are interposed between the spool (30), and the main body (24A) is normally urged toward the lid body (24B) to be in close contact with the spool (30). is biased toward the pressure action chamber (3+), and the discharge valve (14.R) is provided so as to open the discharge port (12R).

Also, the pump room (?]) and the plate room (/1) are the relief passages (
It is provided so that it communicates with the three.

Next, its operation will be explained.〇In the first embodiment shown in FIGS. 1 to 3, FIG. ．． ! 4) is the main body (24Δ
)gahanet. ! 8) The oil pump (1') is in a state where it is forced toward the cover (24) 3) to seal the oil pump (1').

With the main body (24A) and the lid (24B) in close contact with each other in this manner, an electromagnetic clutch (not shown) provided at one end of the drive shaft (2) is connected and operated to generate driving force from the engine. is transmitted to the drive shaft (2), and the oscillating rotation of the swash plate (6) is obtained in the swash plate chamber (4).
Since each piston (5) is moored to the swash plate (6) via the sea (8) and the ball (7), the rocking rotation of the swash plate (6) is controlled by the sea (8). ) and ball (force is transmitted to each piston (5) to create a state in which each piston (5) continuously repeats reciprocating motion within each bore (3), and through this reciprocating motion, refrigerant gas The effect of compressing is obtained.

On the other hand, the rotation of the drive shaft (2) is transmitted to the oil pump (P) mounted on the rear end, so that the oil pump (I') is rotated in the pump chamber (9).

And like this, the oil pump (■・) is in the pump chamber (9)
Geo-oil pan (20) by rotationally driving the 49
The oil that is ridged inside the oil supply passage (22) and the suction groove (2
5) and into the pump (P), and the oil pumped up into the pump (J) in this way flows through the discharge groove (
Drive shaft (2) K is drilled through oil supply passage (2
It is sent towards η.

In this way, the oil sent to the oil supply passage (Jun) is pumped by the discharge pressure of the oil pump (Kou) and the drive shaft (2
) is fed into the injection hole (23) by the action of the centrifugal force obtained by the rotation of the oil. is injected into the thrust bearing (1!1) (J9) to obtain the effect of lubricating the thrust bearing (In+).

The oil that lubricates the thrust bearing (19) (+9) lubricates the slope of the swash plate (6) and then flows into the swash plate chamber (4).
However, the oil is not obtained by the rotation of the g1 plate (6), but is blown away by the centrifugal force, and some of it falls into the body plate chamber (6). 4) sticks to the inner wall surface, flows down along the same inner wall surface, and oil particles (2)
0), while the other part becomes atomized and is contained in the blow-by gas, which is sent together with the blow-by gas into the suction chamber (17FJ) through the communication hole (21).

Then, the rotation of the drive shaft (2) increases and the oil pump (l
・By increasing the pumping capacity of the oil pump (
1.) While the amount of oil sucked into the VC increases, the amount of oil discharged from the oil pump (I) is regulated by the diameter of the oil supply passage (27), resulting in an imbalance between the amount of suction and the amount of discharge. Due to this imbalance, the discharge groove (
26) pressure will rise. When the pressure exceeds the set pressure of the spring (28) twice, the cover (28)
The main body (24A) of 4) moves toward the rear housing (15R), and a gap is created between the main body (24A) and the rear end surface of the oil pump (I'). By creating a gap in this way, the suction amount (25) and the discharge groove (26) are brought into communication, and an effect of releasing the pressure in the discharge groove (26) is obtained. In other words, it is possible to obtain an effect of regulating a further increase in pressure within the discharge groove (2fij), and an effect of preventing power loss of the oil pump (P) due to a pressure increase within the discharge groove C26.

When the rotation of the drive shaft (2) decreases and the pressure in the discharge groove (26) falls below the set pressure of the spring (28), the main body (24A) is re-opened by the biasing pressure of the spring (28). A state in which the body (24B) is in close contact with the oil pump (
P) is sealed and a state is obtained in which normal pumping action can be obtained.

Further, in the second embodiment shown in FIGS. 4 and 5, the fourth
The figure shows the operating state when the cooling load inside the vehicle is large, that is, 1.
This is a drawing showing the 00% operating state, and shows the pressure action chamber (31
), the discharge pressure overcomes the biasing pressure of the spring (28) and the spool (3++) is compressed and broken toward the valve plate (IOR), causing the discharge port (
12R) is closed by the discharge valve (14R).

Figure 5 shows the operating conditions when the cooling load inside the vehicle is small.
In other words, this drawing shows a 50% operating state, and the pressure action chamber 01)K is in a state where suction pressure is supplied, that is, the spring (28)
), the spool (3o) moves into the pressure chamber (3o).
+) 0111 to open the discharge port (12R).

Comparing the above 100% operating state and 50% operating state, in the 100% operating state (Fig. 4), the spring (281) is compressed by the spool (3o) compared to the 50% operating state (Fig. 5). As the spring load is increased by the amount that is
The timing of movement in the R) direction can be delayed. That is, 1
In the 00% operating state, the maximum oil discharge amount can be set higher than in the 50% operating state, and when the load is large and a large amount of oil is required, the oil pressure is increased to provide sufficient lubrication. I can do it.

Effects of the Invention The present invention is constructed as described above, and as described above, the cover that covers the oil pump is provided in separable parts, and the oil pump is normally sealed by the biasing pressure of the spring. The condition is such that the discharge pressure inside the oil pump rises during high-speed rotation, and when the discharge pressure exceeds the set pressure of the spring, the sealing condition of the cover becomes poor and a part of the discharge pressure is released. By doing so, it is possible to suppress the discharge pressure in the oil pump from increasing more than necessary, and thereby it is possible to eliminate wasteful power consumption for driving the oil pump. Furthermore, in the present invention, with the above-described configuration, it is possible to prevent excessive pumping of oil, and also prevent excessive oil circulation and oil pan depletion caused by excessive pumping of oil. V who can do it (I arrived.

Furthermore, in the second embodiment, it has become possible to change the maximum oil discharge amount in accordance with a change in compression capacity, that is, the amount of compression work. Moreover, it has also become possible to obtain cost benefits, such as the ability to use a single spring for both the spring for biasing the spool and the spring for biasing the cover integrally.

[Brief explanation of the drawing]

1 to 3 are drawings showing a first embodiment, in which FIG. 1 is a side sectional view of the swash plate compressor, FIG. 2 is a sectional view of the main body portion with an integrated cover, and FIG. is a sectional view of the oil pump portion. FIGS. 4 and 5 are side sectional views of a swash plate compressor equipped with a variable capacity mechanism, and FIG. 5 is a side sectional view showing the same operating state. (1) /IJ cylinder block, (IF) front cylinder block, (IR) rear cylinder block, (
2) Drive IQb, (2)' shaft hole, (3) bore, (4) swash plate chamber, (5) piston, (6) swash plate, (7) ball, (
8) Shoe, (9) Pump chamber, (IOF) Front valve plate, (IOR) Rear valve plate, (IIF)
) (11R) Suction port, (12F) (12R) Discharge port,
(13F) (13R) Suction valve, (14F) (14R) Discharge valve, (15F) Front housing, (15R) Rear housing, f16) Radial bearing, (To 171)
(17R) Suction chamber, (18F) (18R) Discharge chamber, 0
9) Thrust bearing, (20) Oil pan, (21) Communication hole, (22) Oil supply passage, (23) Injection hole, (24J force bar integrated, (24A) Main body, (24B) Lid body, 05)
Suction groove, (26) Discharge groove, (27) Oil supply passage, (Selection spring, (30) Spool, (31) Pressure action chamber, (32) Bolt, (33) Supply hole, (3 (1) Retainer -1(35
1 escape passage. Patent applicant Toyota Industries Corporation Figure 6 Figure 5

Claims (1)

[Claims] (1) A drive shaft is installed through a cylinder block that is equipped with a swash plate chamber, a plurality of cylinder bores that form a pair of front and rear cylinder bores with the swash plate chamber in between, and an oil pan. A thrust bearing is interposed between the swash plate and the inner wall surface of the swash plate chamber so that the swash plate can be freely oscillated and rotated, and an oil pump is provided at one end of the drive shaft in communication with the oil pan.
In a swash plate compressor, the drive shaft is provided with an oil supply passage with one end communicating with the oil pump, and the other end of the oil supply passage is connected to a thrust bearing. In a swash plate type compressor, an integral cover is divided into a plurality of cover pieces so as to be separable in the front and rear, and a spring is interposed in the integral cover to urge the double-force bar pieces in a direction of close contact. Excessive lubricating oil pumping prevention mechanism.