CN218055148U - Parking brake release system for electrically driven bulldozer and electrically driven bulldozer - Google Patents
Parking brake release system for electrically driven bulldozer and electrically driven bulldozer Download PDFInfo
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- CN218055148U CN218055148U CN202221914073.8U CN202221914073U CN218055148U CN 218055148 U CN218055148 U CN 218055148U CN 202221914073 U CN202221914073 U CN 202221914073U CN 218055148 U CN218055148 U CN 218055148U
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- parking brake
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Abstract
The utility model relates to a parking braking removes system for electric drive bull-dozer, include: a pilot pump; the parking brake control valve is provided with a first port, a second port and a third port, the first port is connected with an oil outlet of the pilot pump, the second port is connected with the hydraulic oil tank, and the third port is connected with the parking brake piston; the brake releasing sequence valve is provided with an oil inlet, a first oil outlet and a second oil outlet, the oil inlet is connected with an oil outlet of the working pump, the first oil outlet is connected with the working hydraulic system, and the second oil outlet is connected with a first port of the parking brake control valve. When the parking brake needs to be released, the parking brake control valve is switched from the first position to the second position, the oil inlet of the brake release sequence valve is communicated with the second oil outlet in a fluid mode, and the first oil outlet is cut off; and when the parking brake is completely released, the oil inlet of the brake release sequence valve is communicated with the first oil outlet in a fluid mode, and the second oil outlet is cut off. The utility model discloses still relate to the electric drive bull-dozer including this parking braking system of relieving.
Description
Technical Field
The utility model relates to a braking system technical field, more specifically relate to a parking braking removes system and an electric drive bull-dozer that removes system including this parking braking for electric drive bull-dozer.
Background
The working pump and the pilot pump of the electrically driven bulldozer are driven by the motor, so that the speed regulation advantage of the motor can be fully exerted, and the rotating speed of the motor can be reduced as far as possible when the flow required by a working hydraulic system is small, thereby achieving the purpose of energy conservation. Meanwhile, in order to further save energy, a pilot pump with small displacement is matched as much as possible. The matching mode can meet most of working conditions of the bulldozer, but has the following problems: under the condition that the pilot pump is a low-rotating-speed and small-displacement pump, the parking brake releasing time of the walking speed reducer is prolonged due to small flow, so that the parking brake is still not completely released when an operator operates a machine to move forwards, and the brake pad is abnormally abraded to influence the service life.
The utility model discloses aim at overcoming prior art's above-mentioned shortcoming.
SUMMERY OF THE UTILITY MODEL
According to an aspect of the present invention, there is provided a parking brake release system for an electrically driven bulldozer, comprising:
the oil inlet of the pilot pump is in fluid connection with the hydraulic oil tank;
a parking brake control valve having a first port fluidly connected to an oil outlet of the pilot pump, a second port fluidly connected to a hydraulic oil tank, and a third port fluidly connected to a parking brake piston of the bulldozer, the parking brake control valve having a first position in which the first port is blocked and the second and third ports are fluidly connected, and a second position in which the first and third ports are fluidly connected and the second port is blocked;
wherein the parking brake release system further comprises a brake release sequence valve having an oil inlet, a first oil outlet and a second oil outlet, the oil inlet being fluidly connected to an oil outlet of a working pump of the bulldozer, the first oil outlet being fluidly connected to a working hydraulic system of the bulldozer, the second oil outlet being fluidly connected to a first port of the parking brake control valve,
when the parking brake needs to be released, the parking brake control valve is switched from a first position to a second position, the brake releasing sequence valve is located at the first position, the oil inlet and the second oil outlet of the brake releasing sequence valve are communicated in a fluid mode, and the first oil outlet is cut off;
when the parking brake is completely released, the brake release sequence valve is switched from the first position to the second position, at the moment, the oil inlet of the brake release sequence valve is communicated with the first oil outlet in a fluid mode, and the second oil outlet is cut off.
Advantageously, a first end of a spool of the priority valve is provided with a spring biasing the spool towards a first position of the priority valve, and a second end opposite the first end is provided with a control chamber in fluid connection with a first port of the parking brake control valve, wherein, when the parking brake is fully released, hydraulic pressure in the control chamber overcomes the force of the spring to switch the priority valve from the first position to the second position.
Advantageously, the brake-release sequence valve is a proportional valve.
Advantageously, the parking brake control valve is a solenoid valve which is in a first position when de-energised and switches from the first position to a second position when energised.
Advantageously, the parking brake release system further comprises a pilot overflow valve, an oil inlet of the pilot overflow valve is fluidly connected with an oil outlet of the pilot pump, an oil outlet of the pilot overflow valve is fluidly connected with a hydraulic oil tank, and an overflow pressure of the pilot overflow valve is set as a parking brake release pressure.
Advantageously, the pilot pump and the working pump are mechanically connected and driven by an electric motor.
According to the utility model discloses a further aspect provides an electric drive bull-dozer, wherein, electric drive bull-dozer includes according to the utility model discloses a parking braking removes system.
Advantageously, a working spill valve is provided between the first oil outlet of the brake release sequence valve and the hydraulic oil tank.
Advantageously, the oil outlet of the pilot pump is fluidly connected with the working hydraulic system pilot accumulator via a one-way valve.
According to the utility model discloses a parking braking removes system provides the braking through the work pump that the sequence valve was relieved to the braking and the confluence of the guide pump of little discharge capacity and removes the flow, can effectively shorten the braking and remove the time, removes the state that pressure control work pump switches back normally to the hydraulic system fuel feeding through the braking simultaneously, can compromise energy-conservation and braking and remove the advantage that the time shortened. The time for completing the brake release through the confluence of the double pumps is short, and the hydraulic system basically has no influence. Therefore, the power loss can be reduced by selecting a pilot pump with small displacement, and the rotating speed of the motor can be reduced to further save electric energy.
Drawings
The invention will be described in more detail below with reference to the schematic drawings. The drawings and the corresponding examples are given for the purpose of illustration only and are not intended to limit the invention. Wherein:
fig. 1 schematically illustrates a parking brake release system according to a preferred embodiment of the present invention.
Detailed Description
Embodiments of the present invention are described below with reference to the drawings. In the following description, numerous specific details are set forth in order to provide a more thorough understanding and enabling description of the present invention to those skilled in the art. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. Furthermore, it should be understood that the invention is not limited to specific described embodiments. Rather, any combination of the features and elements described below is contemplated to implement the present invention, whether or not they relate to different embodiments. Thus, the following aspects, features, embodiments and advantages are merely illustrative and are not considered elements or limitations of the claims except where explicitly recited in a claim.
Fig. 1 schematically shows a parking brake release system 100 for an electrically driven bulldozer according to a preferred embodiment of the present invention. The parking brake release system of the present invention will be described below by way of example with respect to an electrically driven bulldozer, but it will be appreciated that the same inventive principles may be applied to any other suitable work machine or other type of vehicle.
As shown in fig. 1, the parking brake release system 100 includes a pilot pump 1, a parking brake control valve 3, and a brake release sequence valve 5.
An oil inlet of the pilot pump 1 is in fluid connection with the hydraulic oil tank 2, and an oil outlet of the pilot pump 1 is in fluid connection with the parking brake control valve 3, so that oil is supplied to a parking brake piston 4 of the bulldozer through the parking brake control valve 3, and parking brake is released. For energy saving, a pilot pump with a small displacement is preferably used.
In the embodiment shown in fig. 1, the parking brake control valve 3 is a two-position, three-way solenoid valve having a first port 31, a second port 32 and a third port 33. The first port 31 is fluidly connected with the outlet port of the pilot pump 1, the second port 32 is fluidly connected with the hydraulic oil tank 2, and the third port 33 is fluidly connected with the parking brake piston 4. The parking brake control valve 3 has a first position and a second position. In the first position (lower position in fig. 1), the first port 31 is blocked and the second port 32 and the third port 33 are in fluid communication, at which time hydraulic oil in the parking brake piston 4 can be drained to the hydraulic oil tank 2 via the parking brake control valve 3, so that the parking brake piston 4 enters a braking state. In the second position (upper position in fig. 1), the first port 31 and the third port 33 are in fluid communication, and the second port 32 is blocked, at which time hydraulic oil from the pilot pump 1 can be supplied to the parking brake piston 4 via the parking brake control valve 3, releasing the parking brake. As shown in fig. 1, the parking brake control valve 3 is in the first position when de-energized, and is switched from the first position to the second position when energized. It is to be understood that the parking brake control valve 3 may have other suitable structures as long as it can perform the above-described functions.
The brake release sequence valve 5 has an oil inlet 51, a first oil outlet 52 and a second oil outlet 53, the oil inlet 51 is fluidly connected with an oil outlet of the working pump 6 of the bulldozer, the first oil outlet 52 is fluidly connected with the working hydraulic system of the bulldozer, and the second oil outlet 53 is fluidly connected with the first port 31 of the parking brake control valve 3.
As shown in fig. 1, when the priority valve 5 is in the first position (left position in fig. 1), the oil inlet 51 and the second oil outlet 53 of the priority valve 5 are in fluid communication, and the first oil outlet 52 is blocked. At this time, the parking brake control valve 3 can supply the hydraulic oil from the working pump 6 and the hydraulic oil from the pilot pump 1 to the parking brake piston 4 in a merged state, and the merged flow rate of these two pumps enables the brake release to be completed in a short time (for example, approximately 0.1 s), effectively shortening the brake release time. The time for completing the brake release by the confluence of the two pumps is short, so that the working hydraulic system is basically not influenced.
When the priority valve 5 is in the second position (right position in fig. 1), the oil inlet 51 and the first oil outlet 52 of the priority valve 5 are in fluid communication, and the second oil outlet 53 is blocked. At this time, the working pump 6 normally supplies oil to the working hydraulic system.
To control the switching of the priority valve 5 between the first and second positions, a first end of the spool of the priority valve 5 is provided with a spring 54, the spring 54 biasing the spool towards the first position of the priority valve 5. The brake release sequence valve 5 is provided with a control chamber 55 at a second end opposite to the first end, in fluid connection with the first port 31 of the parking brake control valve 3. When the parking brake is completely released, the hydraulic pressure in the control chamber 55 can overcome the spring force of the spring 54 to switch the brake release sequence valve 5 from the first position to the second position.
Advantageously, the brake-release sequence valve 5 may be a proportional valve. This can realize smooth switching of the operating position of the brake release sequence valve 5, and avoid shock.
Advantageously, the parking brake release system 100 further comprises a pilot relief valve 7. An oil inlet of the pilot overflow valve 7 is in fluid connection with an oil outlet of the pilot pump 1, and an oil outlet of the pilot overflow valve 7 is in fluid connection with the hydraulic oil tank 2. The relief pressure of the pilot relief valve 7 is set to the parking brake release pressure.
Advantageously, the pilot pump 1 and the working pump 6 are mechanically connected and jointly driven by an electric motor.
As shown in fig. 1, the oil outlet of the pilot pump 1 may also be fluidly connected to a working hydraulic system pilot accumulator 9 via a one-way valve 10 for pilot oil supply of the working hydraulic system.
Advantageously, the first outlet port 52 of the priority valve 5 can also be fluidly connected to the hydraulic tank 2 via the working overflow valve 8 in order to control the maximum pressure of the working hydraulic system.
The utility model discloses a parking braking is relieved system 100 and is relieved the working pump 6 of the big discharge capacity of sequence valve 5 control and the 1 confluence of the guide pump of little discharge capacity through the braking and provide the braking and relieve the flow, can effectively shorten the braking and relieve the time, relieves pressure control working pump 1 through the braking simultaneously and switches back normally to the state of working hydraulic system fuel feeding, can compromise energy-conservation and the braking and relieve the advantage that the time shortened.
Industrial applicability
The parking brake release system 100 according to the present invention is particularly suitable for use with an electrically driven bulldozer. It will be appreciated that the same inventive principles may be applied to any other suitable work machine or vehicle.
When it is necessary to release the parking brake, the operator energizes the parking brake control valve 3, and the parking brake control valve 3 is switched from the first position (lower position in fig. 1) to the second position (upper position in fig. 1). At the moment, the parking brake piston 4 is in a low-pressure state, the brake release sequence valve 5 works in the left position under the action of the spring 54, the working pump 6 and the pilot pump 1 supply oil to the parking brake piston 4 at the same time, the flow rate of the two pumps is large, and the brake release can be completed in a short time. For example, the brake release time is about 0.1s.
When the parking brake is completely released, the parking brake pressure rises, the brake release sequence valve 5 is switched to the right position to work under the action of the hydraulic pressure in the control chamber 55, and the working pump 6 normally supplies oil to the working hydraulic system. At this time, the release of the parking brake is maintained only by a certain holding pressure, and the pressure holding requirement can be met by the pilot pump 1 with small displacement.
According to the utility model discloses, the time that the braking was relieved is accomplished in the confluence of double pump is very short, does not have the influence basically to work hydraulic system. Therefore, the power loss can be reduced by selecting a pilot pump with small displacement, and the rotating speed of the motor can be reduced to further save electric energy.
The parking brake release system of the present invention has been described above with reference to specific embodiments. It will be apparent to those skilled in the art that various changes and modifications may be made to the parking brake release system of the present invention without departing from the design principles of the present invention. For example, implementations of the invention may not include some of the specific features described, and the invention is not limited to the specific embodiments described, but rather contemplates any combination of the described features and elements. Other embodiments will be apparent to those skilled in the art from consideration of the specification and practice of the disclosed parking brake release system. It is intended that the specification and examples be considered as exemplary only, with a true scope being indicated by the following claims and their equivalents.
List of reference numerals
1. Pilot pump
2. Hydraulic oil tank
3. Parking brake control valve
31. First port of parking brake control valve
32. Second port of parking brake control valve
33. Third port of parking brake control valve
4. Parking brake piston
5. Brake release sequence valve
51. Oil inlet of brake release sequence valve
52. First oil outlet of brake release sequence valve
53. Second oil outlet of brake release sequence valve
54. Spring for brake release sequence valve
55. Control chamber of brake release sequence valve
6. Working pump
7. Pilot overflow valve
8. Working overflow valve
9. Pilot energy accumulator of working hydraulic system
10. One-way valve
100. A parking brake release system.
Claims (9)
1. A parking brake release system for an electrically driven bulldozer, comprising:
the oil inlet of the pilot pump (1) is in fluid connection with the hydraulic oil tank (2);
a parking brake control valve (3) having a first port (31) fluidly connected to an oil outlet of the pilot pump, a second port (32) fluidly connected to a hydraulic oil tank, and a third port (33) fluidly connected to a parking brake piston (4) of the bulldozer, the parking brake control valve having a first position in which the first port is blocked and the second port and the third port are fluidly connected, and a second position in which the first port and the third port are fluidly connected and the second port is blocked;
the parking brake release system is characterized by further comprising a brake release sequence valve (5) which is provided with an oil inlet (51), a first oil outlet (52) and a second oil outlet (53), wherein the oil inlet is in fluid connection with the oil outlet of a working pump (6) of the bulldozer, the first oil outlet is in fluid connection with a working hydraulic system of the bulldozer, the second oil outlet is in fluid connection with a first port of the parking brake control valve,
when the parking brake needs to be released, the parking brake control valve is switched from a first position to a second position, the brake releasing sequence valve is located at the first position, the oil inlet and the second oil outlet of the brake releasing sequence valve are communicated in a fluid mode, and the first oil outlet is cut off;
when the parking brake is completely released, the brake release sequence valve is switched from the first position to the second position, at the moment, the oil inlet of the brake release sequence valve is communicated with the first oil outlet in a fluid mode, and the second oil outlet is cut off.
2. The parking brake release system of claim 1, wherein a first end of a spool of the priority valve is provided with a spring (54) biasing the spool towards a first position of the priority valve, and wherein the priority valve is provided at a second end opposite the first end with a control chamber (55) in fluid connection with a first port of the parking brake control valve, wherein when the parking brake is fully released, hydraulic pressure in the control chamber overcomes the force of the spring to switch the priority valve from the first position to a second position.
3. The parking brake release system according to claim 1 or 2, characterized in that the brake release sequence valve is a proportional valve.
4. The parking brake release system according to claim 1 or 2, wherein the parking brake control valve is a solenoid valve that is in a first position when de-energized and switches from the first position to a second position when energized.
5. The parking brake release system according to claim 1 or 2, further comprising a pilot overflow valve (7), an oil inlet of the pilot overflow valve being fluidly connected to an oil outlet of the pilot pump, an oil outlet of the pilot overflow valve being fluidly connected to a hydraulic oil tank, and an overflow pressure of the pilot overflow valve being set as a parking brake release pressure.
6. The parking brake release system according to claim 1 or 2, characterized in that the pilot pump and the working pump are mechanically connected and driven by an electric motor.
7. An electrically driven bulldozer, characterized in that it comprises a parking brake release system according to any one of claims 1 to 6.
8. Electrically driven bulldozer according to claim 7, characterised in that a working overflow valve (8) is provided between said first oil outlet (52) of said brake release sequence valve (5) and said hydraulic oil tank (2).
9. The electrically driven bulldozer according to claim 7 or 8, characterized in that the oil outlet of said pilot pump (1) is fluidly connected to a working hydraulic system pilot accumulator (9) via a one-way valve (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221914073.8U CN218055148U (en) | 2022-07-22 | 2022-07-22 | Parking brake release system for electrically driven bulldozer and electrically driven bulldozer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221914073.8U CN218055148U (en) | 2022-07-22 | 2022-07-22 | Parking brake release system for electrically driven bulldozer and electrically driven bulldozer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218055148U true CN218055148U (en) | 2022-12-16 |
Family
ID=84402292
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221914073.8U Active CN218055148U (en) | 2022-07-22 | 2022-07-22 | Parking brake release system for electrically driven bulldozer and electrically driven bulldozer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218055148U (en) |
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2022
- 2022-07-22 CN CN202221914073.8U patent/CN218055148U/en active Active
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