JPH0612206Y2 - Automotive pump device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a vehicle pump device, and more particularly to an improvement of a vehicle pump device having two pumps driven by an engine.

2. Description of the Related Art Some pumps mounted on an automobile include a rotary shaft, and the rotary shaft is driven by an automobile driving engine. Examples thereof include a vacuum pump that supplies vacuum pressure to a booster that assists the operation of a brake or the like, and a power steering pump that supplies hydraulic oil to a power steering device that assists the steering wheel operation. Driving of such a pump by the engine is described in "Toyota Soarer New Model Car Manual" (January 1986, Part No. 61098), 3-14,
As described on page 3-15, a pulley fixed to the crankshaft of the engine and a pulley fixed to the rotary shaft of each pump are connected by belts, and the rotation of the crankshaft is transmitted to the pumps by the belts. When two pumps are provided, each pump is usually driven separately. This is because the rotation transmission capability of the belt is not so large, and it is not easy to drive the two rotary shafts by the rotation transmitted by the common belt.

However, the belt is likely to slip, has a low rotation transmission capability, and is easily worn due to sliding resistance generated between the belt and the pulley, resulting in a short service life.Therefore, it is necessary to replace the belt frequently. However, there is a problem that it is troublesome and it is difficult to increase the capacity of the pump.

Further, since the two pumps are driven separately, the drive system around the engine becomes complicated, which reduces the degree of freedom in designing around the engine and increases the manufacturing cost.

Means for Solving the Problems In order to solve the above-mentioned problems, an automotive pump device according to the present invention has: (a) a first pump shaft rotatably supported by a first pump housing; A first pump protruding outward and having a driven gear fixed to a protruding end portion of the first rotating shaft; and (b) being fixed to the first pump housing, the driven gear being inserted through the first pump housing. The gear case, which is supported and housed inside, and (c) the second rotating shaft, which is rotatably supported by the second pump housing, protrudes outside the second pump housing, and the protruding end part is cantilevered into the gear case. And a second pump in which the second pump housing is fixed to the gear hole in the fitting hole in the center of the driven gear such that the second pump housing is fixed to the gear case, and (d) the crank of the engine in the gear case. A drive gear fixed to the shaft and driving the driven gear directly or indirectly via another gear is configured.

Action and effect In the vehicle pump device configured as described above,
The driven gear is rotated as the crankshaft is rotated, the first rotating shaft provided with the driven gear is rotated, and it is fitted into the fitting hole at the center of the driven gear so as not to rotate relative to it. The combined second rotary shaft is also rotated, and the first and second pumps are driven.

In this way, if you use gears to transmit rotation,
Compared to the case of using a belt, a large driving force can be transmitted, and two concentrically connected rotating shafts can be driven by a common gear, and each pump can be transmitted by a separate belt. The structure around the engine can be simplified as compared with the case of driving by the generated force. Moreover, the capacity of the pump can be increased, and the gear has higher durability and reliability than the belt and has a long life, so that the gear need not be replaced.

Further, the first pump and the second pump have a relatively short axial distance because the second rotary shaft is fitted into the fitting hole of the driven gear fixed to the first rotary shaft so that they cannot rotate relative to each other. The pump device can be made compact. A driven gear is separately attached to each rotating shaft of the first pump and the second pump, and the driven gear is circumferentially spaced from a drive gear fixed to the crankshaft or a gear meshed with the drive gear. Mesh, or
The width of the gear with which the driven gear meshes (dimension in the axial direction)
The effect of using the gears can be obtained even if the gears are made larger and the driven gears are lined up in the axial direction of the drive gears and meshed, but in that case, the meshed parts become large. Therefore, the effect of compact construction cannot be obtained.

Further, the first pump and the second pump each have their own pump housing, and the rotation shaft is rotatably supported by each pump housing, and the first rotation shaft of the first pump projects from the first pump housing. Since the driven gear is fixed to the end portion, the gear case itself does not need a rotating shaft or a bearing for rotatably supporting the driven gear. That is, the bearing of the first pump also serves as the bearing of the driven gear, and the second rotating shaft of the second pump is
By being cantilevered into the gear case and fitted into the fitting hole of the driven gear, it is directly driven by the driven gear. The gear case also does not require a bearing to support the second rotating shaft. Therefore, the structure of the entire pump device is simplified, and the structure can be made more compact.

Embodiments Hereinafter, a case where the present invention is applied to a vehicle pump device including a vacuum pump and a power steering pump will be described as an example with reference to the drawings.

FIG. 4 is a diagram schematically showing the external appearance of the engine 10 with members unnecessary for description being removed. In this engine 10, as shown in FIG. 2, the crankshaft 12
The rotation of is transmitted to another rotating shaft by a gear. The drive gear 14 fixed to one end of the crankshaft 12 meshes with an idler gear 18 rotatably attached to a shaft 16, while the idler gear 1
8, a timing gear 22 fixed to the camshaft 20 and a gear 26 fixed to the rotary shaft 24 of the injection pump are engaged with each other.
The rotation of the crankshaft 12 is transmitted to the camshaft 20 and the rotary shaft 24 by the meshing of 6. The gear 26 is also rotatably mounted around a shaft 28, and meshes with a gear 30 that drives a rotary shaft of a vacuum pump and a power steering pump, which will be described later. The gears 14, 18, 22, 26, 30 are housed in a cylinder block 32, and a fan 34 provided outside the cylinder block 32 (see FIG. 4).
Are driven by the rotation of the crankshaft 12 transmitted by the belt 36, as in a conventional engine.

A protrusion 40 is formed near the portion of the cylinder block 32 in which the gear 30 is housed, and a vacuum pump 42 and a power steering pump 44 are attached to the protrusion 40. A space 46 is formed inside the protrusion 40 as shown in FIG. The space 46 is opened to the space in the cylinder block 32, and the gear 30 is partially positioned in the space 46. The protrusion 40 is also formed with openings 48 and 50 on a pair of side walls facing each other, and the vacuum pump 42 and the power steering pump 44 respectively have a housing 52 and a housing 52.
A part of 54 is attached to the projection 40 in a state of protruding into the space 46 through the openings 48 and 50.

The housing 54 of the power steering pump 44 is composed of a plurality of members fixed to each other. The one member 56 has a tubular shape and is fixed to the protrusion 40 while protruding into the space 46 from the opening 50, and the rotary shaft 58 has the bearings 60, 62 and the seal 64 in the member 56. It is rotatably attached through. One end of the rotary shaft 58 is projected from the member 56 into the space 46, while the other end is projected into a closed space 70 formed by a housing constituent member 66 fixed to the member 56, and the projection thereof. A rotor 72 is fitted to the end portion such that the rotor 72 cannot rotate relatively. A plurality of vanes 74 are slidably fitted to the rotor 72, and when the rotating shaft 58 is rotated, hydraulic oil passes through the suction port 76 and the pair of suction ports 78,
The rotor 72 flows into a compression chamber formed between the block 80 in which the rotor 72 is housed and the rotor 72, and is further discharged from a pair of discharge ports 86 provided in a block 84 that is closely attached to the block 80 by a spring 82, Discharge passage 8
It is supplied to the power steering device via 8. In addition,
The discharge passage 88 is provided with a flow control valve 89 so that the supply amount of hydraulic oil is kept constant.

Further, the end of the rotary shaft 58 on the side projecting into the space 46 has a tubular shape and has a larger diameter than the rotary shaft 58, but has a diameter that allows the driven gear to pass through the opening 48. 90 is fitted while the relative rotation is blocked by the key 92,
It is fixed by a nut 94. This driven gear 90
Is meshed with the gear 30, and when the crankshaft 12 is rotated, the rotation of the drive gear 14 is
It is transmitted to the driven gear 90 via the idler gear 18, the gears 26 and 30. In the present embodiment, these gears 18, 26, 30 form a gear train.
Further, the spline 96 is provided on the inner peripheral surface of the driven gear 90.
Are formed.

On the other hand, the housing 52 of the vacuum pump 42 includes a tubular member 98 and a container-shaped member 100 having a bottom, and the container-shaped member 100 extends from the projection 40 of the tubular member 98 fitted into the opening 48. It is fixed to the protruding end. In the housing 52, one end is rotatably supported by the tubular member 98 via the bearing 104 and the seal 106, and the other end is supported by the bottom wall of the container-shaped member 100.
A rotary shaft 110 is rotatably supported by the rotary shaft 110. The rotary shaft 110 is attached concentrically with the rotary shaft 58, and the space inside the container-shaped member 100 is the third space.
As is clear from the drawing, the rotor chamber 112 has a circular cross section and is eccentric with respect to the axis of the rotating shaft 110.

A rotor 114, which is spline-fitted to the rotating shaft 58, is accommodated in the rotor chamber 112, and a cross-sectional area in the circumferential direction is provided between the rotor chamber 112 and the rotor 114 as shown in FIG. A gradually changing space is formed. This space is partitioned into four compression chambers by slidably contacting the rotor 114 and four vanes 116 fitted at equal angular intervals in sliding contact with the inner peripheral surface of the rotor chamber 112.

Further, in the container-shaped member 100, the suction hole 122 has the rotor 1
A discharge hole 124 is formed so as to communicate with the compression chamber whose volume increases with the rotation of 14, and also communicate with the compression chamber whose volume decreases. Suction hole 12
2 is connected to a vacuum tank by a rubber hose (not shown) connected by a joint member 126. When the rotor 114 is rotated as the rotating shaft 110 rotates, the air in the vacuum tank is sucked into the suction hole 12.
2 is sucked into the compression chamber through a check valve 128 provided inside the valve 2, and discharged from the discharge hole 124 as the rotor 114 rotates.

The end of the rotary shaft 110 on the side supported by the tubular member 98 is projected into the space 46 as shown in FIG. 1, and the spline 130 formed on the outer peripheral surface of the projecting end. In, it is fitted to a spline 96 formed inside the driven gear 90. Due to this spline fitting, when the driven gear 90 is rotated, the rotary shaft 110 is rotated.

In the present embodiment, the rotary shaft 58 to which the driven gear 90 is fixed is the first rotary shaft, and the spline 96 of the driven gear 90.
Shaft 11 fitted in a fitting hole having a
0 constitutes the second axis of rotation. Therefore,
The power steering pump 44 having the rotating shaft 58 is the first pump, and the vacuum pump 42 having the rotating shaft 110.
Is the second pump, and the housings 54 and 52 of the respective pumps 44 and 42 are the first pump housing and the second pump housing, respectively. Further, in the cylinder block 32, the projection 40 to which the housings 54 and 52 are fixed and the portion that houses the gears 14, 18, 22, 26, 30 and the like form a gear case.

In the pump device configured as described above, when the crankshaft 12 is rotated, the rotation is transmitted to the driven gear 90 by the gears 14, 18, 26, 30 and the rotating shaft 58 is rotated and rotated. Axis 110
Is rotated, and the vacuum pump 42 and the power steering pump 44 respectively supply a vacuum pressure to the brake booster and a hydraulic oil to the power steering device.

The vacuum pump 42 and the power steering pump 44 are respectively provided with rotating shafts, and the constituent members including the rotating shafts 58 and 110 are assembled in the housings 52 and 54, respectively, and the pumps 42 and 44 are respectively assembled. It can be fixed to the protrusion 40 in the state of a sub-assembly. That is, the power steering pump 44, which is a sub-assembly, is fixed to the protrusion 40, the driven gear 90 is inserted into the space 46 through the opening 48, and fixed to the rotating shaft 58.
It suffices to mount and fix the rotary shaft 110 on the projection 40 while fitting the rotary shaft 110 to the driven gear 90. When the rotary shafts of both pumps are common, it is necessary to assemble one of the pumps directly with respect to the engine, whereas in the pump device of this embodiment, each pump is assembled. By previously assembling the sub-assembly in another place, it is not necessary to assemble the pump on the engine, and the pump device can be easily and quickly assembled to the engine.

In the above embodiment, the relative rotation preventing means is constituted by the splines 96, 130, but it may be constituted by other means such as a key.

Further, in the above embodiment, the driven gear 90 is meshed with the drive gear 14 fixed to the crankshaft 12 via a plurality of gears, but the configuration of the gear train is appropriately set according to the surrounding circumstances. It may be changed, and drive gear 1
4 may be directly engaged.

Furthermore, the present invention is not limited to a pump device for an automobile provided with a vacuum pump and a power steering pump,
The present invention can be applied to an automotive pump device in which one or two pumps are pumps other than the vacuum pump and the power steering pump, and the pumps other than the vane pump may be used.

In addition, although not exemplified, the present invention can be implemented in various modified and improved modes based on the knowledge of those skilled in the art.

[Brief description of drawings]

FIG. 1 is a front sectional view showing an automobile pump device according to an embodiment of the present invention. FIG. 2 is a front view showing a gear train of the pump device. FIG. 3 is a side sectional view showing a vacuum pump of the pump device. FIG. 4 is a plan view schematically showing an engine equipped with the pump device. 10: engine, 12: crankshaft 14: drive gear, 18: idler gear 26, 30: gear, 42: vacuum pump 44 ... power steering pump 58: rotary shaft, 90: driven gear 96: spline, 110: rotary shaft 130 :spline

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Creator Noriyuki Kanzaka 1-1 Daihatsu Town, Ikeda City, Osaka Prefecture Daihatsu Industrial Co., Ltd. (56) References 39683 (JP, Y1)

Claims (1)

[Scope of utility model registration request] 1. A first pump in which a first rotary shaft rotatably supported by a first pump housing projects outside the first pump housing, and a driven gear is fixed to a projecting end portion of the first rotary shaft. A gear case which is fixed to the first pump housing and accommodates the driven gear through the first pump housing while being housed therein; and a second rotating shaft which is rotatably supported by the second pump housing. The second pump housing protrudes out of the pump housing, and the protruding end of the protruding end projects into the gear case in a cantilever manner and is fitted into a fitting hole at the center of the driven gear so as not to rotate relative to the gear case. And a second pump fixed to the crankcase of the engine in the gear case to drive the driven gear directly or indirectly through another gear. Automobile pump apparatus which comprises a driving gear that.