JPS592209Y2 - Turning energy recovery device for upper turning vehicles - Google Patents

Description

[Detailed description of the invention] This invention relates to a turning energy recovery device for an upper revolving vehicle that recovers the turning energy generated when the upper revolving body starts and stops turning and can be used for other purposes, making effective use of energy. The purpose is to measure.

This invention will be described in detail below with reference to an illustrated embodiment.

In the figure, reference numeral 1 denotes an upper revolving vehicle in which an upper revolving body 3 can swing freely relative to the footrest 2, and it has a revolving pump 5 rotated by a drive source 4, and the discharge side of this pump 5 is a swing operation valve 6. It is connected to the swing motor 7 via.

The swing motor 7 is installed in a swing mechanism 8 provided between the undercarriage 2 and the upper revolving body 3, and is configured to enable the upper revolving body 3 to rotate relative to the undercarriage 2, and to rotate the upper revolving body 3 with respect to the undercarriage 2. The motor 7 is driven by an energy generator 11 or a pump 9 via a gear 8a of a rotating mechanism 8.

The inlet and outlet of the energy recovery pump 9 are conduits 10 and 11, respectively.
One end side of these pipes 10 and 11 are connected, and the other end sides of these pipes 10 and 11 are connected to the swing operation valve 6, and are communicated with each other when the swing operation valve 6 is operated to the swing position a or b. It has become so.

Also, between these pipes 10 and 11, there is a pair of check valves 12 whose inlet sides are opposed to each other, and a pair of IJs whose outlet sides are opposed to each other.
The IJ-F valves 13 are connected in series, and an oil tank 15 is connected between each check valve 12 through a return pipe 25 and a check valve 14. The outlet side of the valve 13 is connected to a hydraulic motor 17 via a check valve 16.
The outlet side of the hydraulic motor 17 is connected to the drain circuit 18.

The hydraulic motor 17 rotates, for example, an engine cooling fan 19, and a pressure accumulator 20 is separately connected to the inlet side of the hydraulic motor 17.

Furthermore, the inlet side pipe line 21 of the pressure accumulator 20 and the hydraulic motor 17
is connected to the outlet side of a relief valve 23 which is connected to the discharge side of the swing pump 5 via a check valve 22, and the hydraulic pressure relieved from this relief valve 23 flows to the pressure accumulator 20 and the hydraulic motor 17 side. It looks like this.

Note that 24 is a throttle provided in the return pipe 25 to forcibly send a part of the return oil from the swing motor through the check valve 12 to the pipes 10 and 11 on the recovery pump 9 side. This is to replenish oil that has flowed to the side.

When the swing operation valve 6 is operated to the a or b position in order to swing the upper swing structure 3, the hydraulic pressure discharged from the swing pump 5 rotates the swing motor 7 while being regulated by the relief valve 23, and the swing mechanism 8 The upper revolving body 3 is rotated through the hydraulic motor 17, and the hydraulic pressure relieved from the relief valve 23 at the start of the rotation is supplied to the inlet side of the hydraulic motor 17.
The engine is cooled, and a part of the pressure is stored in the pressure accumulator 20.

In addition, the energy recovery pump 9 is operated in each pipe line 10 and 1 by operating the swing operation valve 6 to the swing position a or b.
1 is in communication with each other, so it is idling while turning.

Next, when the swing operation valve 6 is set to neutral to stop the swing, the hydraulic pressure discharged from the swing pump 5 is transferred to the throttle 2 of the return pipe 25.
4, the swing motor 7 is stopped, and at the same time the pipes 10 and 11 are cut off. Therefore, the hydraulic pressure discharged from the energy recovery pump 9 rotated by the inertial energy of the upper swing structure 3 When relieved from the relief valve 13, it acts on the energy recovery pump 9 as a braking hydraulic pressure and stops the upper revolving structure 3.

Further, the hydraulic pressure relieved from the relief valve 13 flows to the hydraulic motor 17 and rotates the cooling fan 19, and a part of the pressure is accumulated in the pressure accumulator 20.

In the above embodiment, the recovered energy is used to rotate the cooling fan 19 to cool the engine, but the recovered energy may of course be used for other purposes.

As detailed above, this idea uses the hydraulic pressure relieved when the upper revolving structure starts and stops to rotate the hydraulic motor and cool the engine, which would otherwise have been wasted in the past. Energy can be used effectively and is very economical.

In addition, the recovery circuit is independent from the swing circuit, and the swing pump has sufficient capacity to swing the upper revolving structure, so it is possible to move to swing work immediately after startup, improving work efficiency, and rotating the upper revolving structure. Even if the time becomes longer, the turning speed does not decrease.

Furthermore, the recovered energy can be used for other purposes,
There are no restrictions on the scope of use.

[Brief explanation of the drawing]

The drawing is a circuit diagram showing an embodiment of this invention. 2 is an undercarriage, 3 is an upper revolving structure, 5 is a swing pump, 7 is a swing motor, 9 is a recovery pump, 13 and 23 are linenoff valves, 19 is a cooling fan, and 20 is a pressure accumulator.

Claims (1)

[Scope of utility model registration request] In a device in which an upper rotating body 1 that can freely pivot relative to the footrest 2 is driven to swing by a swing motor 7 that is rotated by hydraulic pressure supplied from a swing pump 5 through a swing operation valve 6, the swing motor 7 is equipped with a mechanical collection motor 9
The entrance and exit of the collection motor 9 is connected to the conduit 10.11 during turning.
A relief valve 1 is provided between the pipelines 10 and 11 to relieve the hydraulic pressure on the high pressure side to the pressure accumulator 20 via the check valve 16.
3, and a driven circuit is connected to a conduit 21 connecting a check valve] 6 and a pressure accumulator 20.