CN109899332A - Walking motor time-delay brake valve and walking motor - Google Patents
Walking motor time-delay brake valve and walking motor Download PDFInfo
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- CN109899332A CN109899332A CN201910293054.4A CN201910293054A CN109899332A CN 109899332 A CN109899332 A CN 109899332A CN 201910293054 A CN201910293054 A CN 201910293054A CN 109899332 A CN109899332 A CN 109899332A
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- 238000013016 damping Methods 0.000 claims abstract description 46
- 230000007246 mechanism Effects 0.000 claims abstract description 14
- 206010008469 Chest discomfort Diseases 0.000 claims description 8
- 239000000446 fuel Substances 0.000 claims description 4
- 239000011230 binding agent Substances 0.000 claims 1
- 238000012545 processing Methods 0.000 abstract description 5
- 238000012423 maintenance Methods 0.000 abstract description 3
- 238000005245 sintering Methods 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 abstract 1
- 239000012530 fluid Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 1
- 206010037660 Pyrexia Diseases 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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Abstract
The invention discloses a travel motor delay brake valve and a travel motor, wherein the delay brake valve comprises a valve seat, a valve core and a return spring which is sleeved on the valve core and clamped by the valve core and the valve seat; the valve core is provided with a damping groove; an oil drainage hole which can be communicated with an oil drainage cavity of the motor shell is formed in the groove of the valve seat facing the valve core; when the valve core is located at a first relative position relative to the valve seat, the damping groove is communicated with the bypass oil duct, and oil in the bypass oil duct flows to the oil drainage hole through the damping groove; when the valve core is located at the second relative position relative to the valve seat, the damping groove is blocked by the valve seat, and oil in the bypass oil duct directly flows to the brake piston mechanism. The delay brake valve ensures that the parking brake can be quickly released when the motor is started, the parking brake lags behind the hydraulic brake when the motor is stopped, the brake delay time is adjustable, and the problems of friction plate sintering, heating and the like caused by mismatching of the delay time are solved. The reliability of the walking motor is improved while the processing cost and the maintenance difficulty are reduced.
Description
Technical field
The present invention relates to hydraulic, machinery field, a kind of running motor delay braking valve and running motor are related in particular to.
Background technique
Various types of crawler belt machinery are widely used in civilian, communications and transportation, hydraulic engineering, mine excavation and modern army
The mechanized construction of thing engineering.The multi-purpose oblique tray type plunger motor of its travel driving unit is attached to a star-like speed reducer and carrys out structure
At the device is known as running motor.
Running motor generally requires have two kinds of braking modes of hydraulic braking and parking braking, is reflected into driving unit plunger
On motor, that is, piston motor is required to have two kinds of braking modes.When excavator will start, often require that running motor can
Rapid reversal parking braking avoids the occurrence of in the case where hydraulic energy driving piston motor operating, parking braking still without releasing,
Friction disc wear is caused to be generated heat；When excavator parking, often require that running motor parking braking will have delay, i.e. parking braking
Hydraulic braking is lagged behind, when avoiding the occurrence of piston motor without parking operating completely, parking braking is had been started up, and leads to friction plate
Excessive wear；Therefore running motor needs to have delay braking valve, when the motor is activated can be with Rapid reversal parking braking；Work as horse
Up to when parking, parking braking lags behind hydraulic braking, prevents running motor friction plate excessive wear, influences motor life.
The Chinese patent of Patent No. CN203413174U discloses a kind of excavator rotary motor delay braking valve, such as
Shown in Fig. 1, when delay braking valve works, guide's hydraulic fluid port SH is passed through guide oil, pushes spool 11 to be moved to the left, hydraulic fluid port PG and oil circuit
A connection, the pressure oil of hydraulic fluid port PG successively passes through oil circuit A, oil circuit B enters motor internal detents, motor brake release；Work as motor
When stopping working, guide's hydraulic fluid port SH guide oil is closed, and spool 11 is rebounded from left to right by spring 8, i.e. between hydraulic fluid port PG and oil circuit A
It being cut off, the oil in motor internal detents successively flows back to fuel tank from oil circuit B, oil circuit A, oil-through-hole 19, damping hole 5, oil circuit C,
Due to the presence of damping hole 5, being cut to brake from guide oil and brake completely will appear the delay of certain time, and delay time takes
Certainly in the size of the capacity of brake oil pocket and damping hole 5.The program is to be attached to the hydraulic motor of delay braking function in the market
The scheme generallyd use, the program need additional external control guide's oil circuit, and complete machine stringing is complicated, and outside delays time to control valve block
It sets, valve block and motor end cap lean on seal with O ring, increase risk of leakage, and spool requirement on machining accuracy is high, and inner oil way structure is multiple
Miscellaneous, difficulty of processing is big, at high cost.
Summary of the invention
The technical problems to be solved by the invention:
The invention proposes a kind of bi-bit bi-pass delay braking valves of built-in walk motor with hydraulic pressure end cap, efficiently solve in the market
The external problem of generally existing delay braking valve, simplifies delay braking valve arrangement and inner flow passage, it is ensured that motor starting
When can realize Rapid reversal parking braking, when motor stops, parking braking lags behind hydraulic braking, and the brake lag time is adjustable,
Solves the problems such as friction plate sintering, fever caused by delay time mismatch.Reduce processing cost, maintenance difficulty it is same
When, improve the reliability of running motor.
In order to solve the above technical problems, The technical solution adopted by the invention is as follows:
A kind of running motor delay braking valve, be inserted in valve seat including valve seat, one end and can opposite valve seat movement spool and set
In the reset spring clamped on spool and by spool and valve seat；
A damping slot is opened up on spool；Valve seat can pass to the oil leak hole of motor shell draining chamber towards being provided in the groove of spool；
It when spool opposite valve seat is located at the first relative position, is connected to damping slot with bypass oil duct, bypasses the oil in oil duct through hindering
Buddhist nun's slot flows to oil leak hole；
It when spool opposite valve seat is located at the second relative position, blocks damping slot by valve seat, makes to bypass the oil directly stream in oil duct
To brake piston mechanism.
Further, it is built in running motor end cap, bypass oil duct is provided in end cap.
Further, bypass oil duct have the first outside port for being connect with brake piston mechanism and with balanced valve high pressure chest
Second outside port of connection.
Further, bypass in oil duct include be arranged in channel between the second outside port and spool the other end face,
Channel between second outside port and the first outside port is set.
Further, bypass includes the channel being arranged between the first outside port and damping slot in oil duct.
Further, it is passed through oil into bypass oil duct from the second outside port, is located at spool opposite valve seat by oil pressure
Second relative position.
Further, spool opposite valve seat is made to be located at the first relative position by the restoring force of reset spring.
Further, valve seat is circumferentially provided with the annular groove for installing O-ring, passes through seal with O ring between valve seat and end cap.
A kind of running motor, including motor and the balanced valve being connect with motor brake, delay braking valve and brake piston
Mechanism；
Delay braking valve include valve seat, one end be inserted in valve seat and can opposite valve seat movement spool and be placed on spool and by valve
The reset spring of core and valve seat clamping；
A damping slot is opened up on spool；Valve seat can pass to the oil leak hole of motor shell draining chamber towards being provided in the groove of spool；
When the motor is activated, the high pressure oil entered from oil inlet opens balanced valve, enters the bypass of delay braking valve by balanced valve
In oil duct, pushes the spool opposite valve seat of delay braking valve to be located at the second relative position, block damping slot by valve seat, make to bypass
High pressure oil in oil duct flows directly into brake piston mechanism, releases motor braking；
When motor parking, oil inlet fuel cut-off closes balanced valve, and delay braking valve is acted in the restoring force of reset spring
Lower opposite valve seat is located at the first relative position, is connected to damping slot with bypass oil duct, the oil return of brake piston mechanism is by bypass oil duct
Enter motor shell draining chamber by the damping slot of delay braking valve, oil leak hole, realizes motor parking delay braking.
Further, pass through the big minor adjustment brake piston mechanism time-delay closing time of the damping slot.
Technical solution of the present invention bring the utility model has the advantages that
1. running motor cover internal built in delay braking valve does not need additional additional element and system；
2. delay braking valve is built-in bi-bit bi-pass reversal valve, structure type is simple and reliable, and processing cost is low；
3. delay braking valve through-hole type designs, valve core structure interchangeability is high, and maintenance difficulty is small；
4. delay braking valve inner flow passage is simple, difficulty of processing is small, at low cost；
5. motor releases brake oil and leads directly from balanced valve high pressure chest, high pressure oil acts on delay braking valve core all the way, makes valve
Core is pushed into seat bottom portion, by side, bottom surface and seal with O ring, effectively high pressure oil can be prevented to enter inside motor shell, reduces
Motor leakage rate；
Motor releases brake oil another way and is directly connected to brake piston chamber, can be braked with Rapid reversal motor, realizes motor elder generation
The logical order control that parking braking is restarted is released, friction plate excessive wear is avoided；
6. delay braking spool is equipped with circumferential damping slot, when motor stopping brake, balanced valve is closed, and delay braking valve resets,
Damping slot oil duct is opened, and the oil return of brake piston chamber can be returned directly to enclosure interior by spool damping slot, by adjusting delay system
Dynamic valve core damping slot size, can flexibly control the delay braking time, elder generation's hydraulic braking is stayed again when realizing motor stopping brake
The logic control sequence of vehicle braking, avoids friction plate excessive wear；
7. motor releases brake oil quoted from motor internal balance valve chamber high pressure oil, when motor stopping brake, brake piston chamber oil return
Enclosure interior is returned to by motor internal delay time brake valve, eliminates external pilot control valve block, motor configuration greatly simplifies.
Detailed description of the invention
Fig. 1 patent CN203413174U structure principle chart in the prior art；
Walk motor with hydraulic pressure end cap delay braking valve arrangement figure built in Fig. 2 present invention；
Fig. 3 is the portion the I delay braking valve arrangement enlarged drawing of Fig. 2；
Fig. 4 is the portion the II delay braking valve damping slot schematic enlarged-scale view of Fig. 3；
Walk motor with hydraulic pressure systematic schematic diagram built in Fig. 5 present invention.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and not intended to limit the protection scope of the present invention.
Embodiment 1
Novel hydraulic running motor delay braking valve of the invention using Fig. 2 to structure shown in Fig. 4, built in delay braking valve 3
In running motor end cap 1, delay braking valve 3 is made of spool 7, reset spring 8, retaining ring 9, valve seat 11 and O-ring 12.Spool
7 one end be inserted in valve seat 11 and can opposite valve seat movement, reset spring 8 is placed on spool 7 and clamped by spool 7 and valve seat 11.
A damping slot 71 is opened up on spool 7；Valve seat can pass to the oil leak hole 10 of motor shell draining chamber towards being provided in the groove of spool；
It when spool opposite valve seat is located at the first relative position, is connected to damping slot with bypass oil duct, bypasses the oil in oil duct through damping slot
Flow to oil leak hole；It when spool opposite valve seat is located at the second relative position, blocks damping slot by valve seat, makes to bypass the oil in oil duct
Flow directly into brake piston mechanism.
Bypass oil duct there is the first outside port for connecting with brake piston mechanism and connect with balanced valve high pressure chest the
Two outside ports.Include in bypass oil duct channel between the second outside port and spool the other end face is set, setting exists
Channel between second outside port and the first outside port.Bypass includes being arranged in the first outside port and damping slot in oil duct
Between channel.
It is passed through oil into bypass oil duct from the second outside port, so that spool opposite valve seat is located at the second opposite position by oil pressure
It sets.Spool opposite valve seat is set to be located at the first relative position by the restoring force of reset spring.
Embodiment 2
On the basis of embodiment 1, in conjunction with Fig. 2 to Fig. 4, in the present embodiment, in order to easy to process, bypass oil duct can be specific
It is set as several oil ducts, including oil duct A, B, C, D, E, and outside is sealed without using port using drawing expansion type plug 2,4,5
It is stifled.
The one end oil duct A is connected to 6 high pressure chest of balanced valve, and other end is sealed by drawing expansion type plug 2.The one end oil duct B
It is connected to oil duct A, the other end connects delay braking valve 3.Oil duct C is respectively communicated with oil duct A and delay braking valve spring chamber 31, C oil
Road bottom is sealed by drawing expansion type plug 5.Oil duct D is respectively communicated with oil duct C, oil duct E and delay braking valve spring chamber 31, oil
Road D right end is sealed by drawing expansion type plug 4, and the one end oil duct E is connected to oil duct D, and the other end leads to brake piston chamber 13.Balance
The high pressure oil of 6 high pressure chest of valve can separately flow into oil duct B, oil duct C through oil duct A, then flow to delay braking valve 3 through oil duct B and act on
It closes delay braking valve on spool 7, while brake piston chamber can be flowed to through oil duct C, oil duct D, oil duct E.
Spool 7 is " T " shape structure, and 7 upper surface of the spool spring 8 that is reset acts on the cascaded surface of oil duct B, and valve is inserted into lower end
In the groove of seat 11.7 bottom of spool is provided with one small section of damping slot 71 in peripheral side, and the oil return of motor delay braking can pass through damping slot
Return to case drain chamber 14.It is provided with oil leak hole 10 in 11 groove of valve seat, motor shell draining chamber 14 can be passed to.Valve seat 11 is circumferential to be opened
There is an annular groove, in 12 inserted valve seat of O-ring, 11 annular groove, be fitted into valve opening together, valve seat 11 passes through 9 axially position of retaining ring.Initial
When state, the spring 8 that is reset of spool 7 is acted on the step of oil duct B, and 8 other end of reset spring acts on the top surface of valve seat 11.
It is as follows to release braking process: assuming that A mouthfuls of oil inlets of motor, B mouthfuls of oil returns, when A mouthfuls of oil inlets of motor, high pressure oil passes through flat
The damping port of weighing apparatus valve slowly opens balanced valve, and oil duct A is connected to balanced valve high pressure chest, and high pressure oil a-road-through oil channel B, which is acted on, to be prolonged
When brake spool 7, under the action of 11 bottom oil leak hole of valve seat, spool 7 is pulled to 11 bottom portion of groove of valve seat, at this moment 7 He of spool
The side of valve seat 11 and bottom surface form sealing, and the damping slot 71 on spool 7 is sealed, in addition 11 circumferential groove in its end portion O-ring of valve seat is close
Envelope, can effectively prevent high pressure oil from entering case drain chamber；Another way enters brake piston by oil duct C, oil duct D, oil duct E
Chamber, high pressure oil release motor friction disc brake by pushing tripping spring.It releases and is not damped in the oil duct of braking, high pressure oil
Motor braking can be released rapidly.
Delay braking process is as follows: when A mouthfuls of fuel cut-offs of motor, the closing of balanced valve 6 returns to middle position, oil duct A, B, C, D, E
There is no high pressure oil, spool 7 returns to initial position under the action of reset spring 8, i.e. spool 7 is acted in the elastic force of reset spring 8
Lower to block the oil duct B other end, the damping slot 71 on spool 7 is opened, and the oil return of brake piston chamber enters through oil channel E, oil duct D prolongs
When brake valve spring cavity 31, and motor shell draining is entered by the circumferential damping slot on spool 7, the aperture in 11 groove of valve seat
Chamber, the circumferential damping slot on spool 7 play the role of making brake piston to be delayed pressing friction piece, pass through and adjust circumferential damping slot
Size, be adjusted the brake piston time-delay closing time.
The present invention also provides a kind of running motors comprising motor 12 and the balanced valve 6 connecting with motor brake prolong
When brake valve 3 and brake piston 13.
Fig. 5 is corresponding motor system schematic diagram, and when motor 12 starts, A mouthfuls of oil inlets, high pressure oil passes through balanced valve
Damping hole slowly opens balanced valve 6, and motor releases the high pressure chest that brake oil leads directly from balanced valve 6, and high pressure oil passes through balanced valve 6
Into 3 oil duct of delay braking valve, wherein pushing the work of the right position of delay braking valve 3 all the way, high pressure oil is made to enter case drain chamber
Oil duct is closed；Another way is directly entered brake piston chamber 13, releases motor braking, releases and does not damp in braking oil duct, makes
It is dynamic to release rapidly.It releases brake pressure to be controlled by brake piston upper spring power, releases brake pressure and be lower than motor starting pressure, institute
It is just started running after parking braking releasing with motor, avoids friction plate excessive wear.
When motor 12 stops, A mouthfuls of fuel cut-offs, balanced valve 6 is closed, effect of the delay braking valve 3 in return spring force
Lower reset, left position are started to work, and 13 oil return of brake piston chamber enters motor shell draining chamber by 3 damping slot of delay braking valve,
It realizes motor parking delay braking, passes through the size of adjusting spool damping slot, controllable motor parking braking time, it is ensured that horse
Up to parking braking is carried out again after hydraulic braking is completed, motor friction plate excessive wear is avoided to generate heat.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of running motor delay braking valve, characterized in that be inserted in valve seat including valve seat, one end and can opposite valve seat movement
Spool and the reset spring that is placed on spool and is clamped by spool and valve seat；
A damping slot is opened up on spool；Valve seat can pass to the oil leak hole of motor shell draining chamber towards being provided in the groove of spool；
It when spool opposite valve seat is located at the first relative position, is connected to damping slot with bypass oil duct, bypasses the oil in oil duct through hindering
Buddhist nun's slot flows to oil leak hole；
It when spool opposite valve seat is located at the second relative position, blocks damping slot by valve seat, makes to bypass the oil directly stream in oil duct
To brake piston mechanism.
2. running motor delay braking valve according to claim 1, characterized in that it is built in running motor end cap, it is other
Road binders road is provided in end cap.
3. running motor delay braking valve according to claim 1, characterized in that bypass oil duct has and brake piston machine
First outside port of structure connection and the second outside port being connect with balanced valve high pressure chest.
4. running motor delay braking valve according to claim 3, characterized in that include being arranged second in bypass oil duct
Channel between outside port and spool the other end face, be arranged in it is logical between the second outside port and the first outside port
Road.
5. running motor delay braking valve according to claim 3, characterized in that include being arranged first in bypass oil duct
Channel between outside port and damping slot.
6. running motor delay braking valve according to claim 4, characterized in that from the second outside port to bypass oil duct
It is inside passed through oil, so that spool opposite valve seat is located at the second relative position by oil pressure.
7. running motor delay braking valve according to claim 5, characterized in that make valve by the restoring force of reset spring
Core opposite valve seat is located at the first relative position.
8. running motor delay braking valve according to claim 1, characterized in that valve seat is circumferentially provided with for installing O shape
The annular groove of circle, passes through seal with O ring between valve seat and end cap.
9. a kind of running motor, characterized in that including motor and the balanced valve being connect with motor brake, delay braking valve and system
Piston mechanism；
Delay braking valve include valve seat, one end be inserted in valve seat and can opposite valve seat movement spool and be placed on spool and by valve
The reset spring of core and valve seat clamping；
A damping slot is opened up on spool；Valve seat can pass to the oil leak hole of motor shell draining chamber towards being provided in the groove of spool；
When the motor is activated, the high pressure oil entered from oil inlet opens balanced valve, enters the bypass of delay braking valve by balanced valve
In oil duct, pushes the spool opposite valve seat of delay braking valve to be located at the second relative position, block damping slot by valve seat, make to bypass
High pressure oil in oil duct flows directly into brake piston mechanism, releases motor braking；
When motor parking, oil inlet fuel cut-off closes balanced valve, and delay braking valve is acted in the restoring force of reset spring
Lower opposite valve seat is located at the first relative position, is connected to damping slot with bypass oil duct, the oil return of brake piston mechanism is by bypass oil duct
Enter motor shell draining chamber by the damping slot of delay braking valve, oil leak hole, realizes motor parking delay braking.
10. running motor according to claim 9, characterized in that pass through the big minor adjustment brake piston of the damping slot
The mechanism time-delay closing time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910293054.4A CN109899332B (en) | 2019-04-12 | 2019-04-12 | Walking motor time-delay brake valve and walking motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910293054.4A CN109899332B (en) | 2019-04-12 | 2019-04-12 | Walking motor time-delay brake valve and walking motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109899332A true CN109899332A (en) | 2019-06-18 |
| CN109899332B CN109899332B (en) | 2020-05-08 |
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ID=66955690
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910293054.4A Active CN109899332B (en) | 2019-04-12 | 2019-04-12 | Walking motor time-delay brake valve and walking motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109899332B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113428120A (en) * | 2021-07-16 | 2021-09-24 | 力源液压（苏州）有限公司 | Pressure reducing valve integrated with time delay function |
| CN113738473A (en) * | 2021-09-30 | 2021-12-03 | 潍柴动力股份有限公司 | Valve bridge assembly, in-cylinder brake system and engine |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201568485U (en) * | 2009-10-19 | 2010-09-01 | 焦作市制动器开发有限公司 | Limitless speed hydraulic directly-operated brake |
| WO2012074295A2 (en) * | 2010-12-01 | 2012-06-07 | 두산인프라코어 주식회사 | Compulsory operation type swing brake device |
| CN102913382A (en) * | 2012-10-31 | 2013-02-06 | 陕西航天动力高科技股份有限公司 | High-reliability hydraulic motor |
| CN202971387U (en) * | 2012-10-31 | 2013-06-05 | 陕西航天动力高科技股份有限公司 | Hydraulic motor brake control device with delay function |
| CN107882801A (en) * | 2017-12-18 | 2018-04-06 | 徐州徐工挖掘机械有限公司 | A kind of delay braking control valve for excavator rotary motor |
-
2019
- 2019-04-12 CN CN201910293054.4A patent/CN109899332B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201568485U (en) * | 2009-10-19 | 2010-09-01 | 焦作市制动器开发有限公司 | Limitless speed hydraulic directly-operated brake |
| WO2012074295A2 (en) * | 2010-12-01 | 2012-06-07 | 두산인프라코어 주식회사 | Compulsory operation type swing brake device |
| CN102913382A (en) * | 2012-10-31 | 2013-02-06 | 陕西航天动力高科技股份有限公司 | High-reliability hydraulic motor |
| CN202971387U (en) * | 2012-10-31 | 2013-06-05 | 陕西航天动力高科技股份有限公司 | Hydraulic motor brake control device with delay function |
| CN107882801A (en) * | 2017-12-18 | 2018-04-06 | 徐州徐工挖掘机械有限公司 | A kind of delay braking control valve for excavator rotary motor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113428120A (en) * | 2021-07-16 | 2021-09-24 | 力源液压（苏州）有限公司 | Pressure reducing valve integrated with time delay function |
| CN113738473A (en) * | 2021-09-30 | 2021-12-03 | 潍柴动力股份有限公司 | Valve bridge assembly, in-cylinder brake system and engine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109899332B (en) | 2020-05-08 |
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