CN102372024A - Engineering machine and steering system thereof - Google Patents
Engineering machine and steering system thereof Download PDFInfo
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- CN102372024A CN102372024A CN2010102503187A CN201010250318A CN102372024A CN 102372024 A CN102372024 A CN 102372024A CN 2010102503187 A CN2010102503187 A CN 2010102503187A CN 201010250318 A CN201010250318 A CN 201010250318A CN 102372024 A CN102372024 A CN 102372024A
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Abstract
The invention discloses a steering system and an engineering machine which comprises the steering system. The steering system comprises an axle, a steering wheel, a wheel rotating arm, a power-assisted steering cylinder and a locking device, wherein the steering wheel, the wheel rotating arm and the power-assisted steering cylinder are connected to the axle; the locking device is used for limiting the steering of the steering wheel; the locking device comprises a hydraulic cylinder and a control valve; the control valve is used for controlling the turn-on/off of fluid flow; and one end of the hydraulic cylinder is connected to the axle while the other end is connected to the wheel rotating arm. The locking device is mounted on the axle and is used for reducing the pulling force influence of a steering rod system. Under the lubrication of oil in the hydraulic cylinder, the abrasion of parts is reduced, the service life of a piston in the steering locking device is obviously prolonged, the demand on material quality is lowered and the reliability of the locking device is further promoted.
Description
Technical field
The present invention relates to technical field of engineering machinery, particularly relate to a kind of steering swivel system that is used on the construction machinery and equipment, in addition, the invention still further relates to a kind of construction machinery and equipment that comprises above-mentioned steering swivel system.
Background technology
In engineering machinery field, especially to those heavy-duty machineries, whether mechanical steering directly has influence on the height of operating efficiency flexibly.
At present, some heavy-duty machineries generally have a plurality of axles (being often referred to more than four) and participate in turning to, or even four-wheel steering, for example multiaxis hoisting crane.The multi-axle steering pattern no doubt can satisfy the requirement of alerting ability, but safety factor is not high.For taking into account safety and alerting ability, generally be through trailing wheel being locked to participate in turning to control.
Please refer to Fig. 1 and Fig. 2, Fig. 1 is a kind of representative type steering swivel system scheme drawing; Fig. 2 is a kind of representative type Lenkradschlossvorrichtung scheme drawing.
Steering gear connection mechanism generally includes steering gear connection structure 14 (generally can comprise steering side tube, tierod), deflector, steering swivel; Existing steering shaft locks mechanism Lenkradschlossvorrichtung is installed in the steering gear connection structure; Adopt the mode of mechanical caging, Fig. 1 is a kind of representative type steering lock mechanism scheme drawing.Operator's steering wheel rotation 12, deflector 13 control steering oil road directions are connected in the steering jack oil transportation on the axletree 15 usually, and the flexible wheel flutter that drives of steering jack rotates.Lenkradschlossvorrichtung 11 is installed in the steering gear connection mechanism; Under the normal highway travel situations; As shown in Figure 2, Lenkradschlossvorrichtung 11 is in the lock state, and piston 115 is pressed on the connecting rod 118 by spring 114; Insert in the positioning groove 117 of connecting rod 118 its underpart, and whole device plays the push-and-pull rod effect; When needs unlocked, high pressure gas got into from admission port 113, and piston 115 is upward movement under high pressure gas promote; Exhausr port 111 is accomplished exhaust; Piston 115 heads break away from the positioning groove 117 of connecting rod 118, get in the chute 116, have just accomplished the releasing process of blocking device this moment; Wherein the state of the locking and unlocking can utilize travel switch 112 to detect again, detection signal is passed to inform the operator in the operator's compartment then.
Yet this Lenkradschlossvorrichtung exists significantly not enough.The first, because piston 115 need be done the action of the locking and unlocking in cylinder barrel, i.e. crank motion, the processing of piston 115, cylinder barrel and relevant some parts and handling is relatively wasted time and energy.The second, because this blocking device uses in steering hardware, it is bigger to receive when turning to about steering hardware tensile impact, and piston 115 all needs modifier treatment to obtain higher hardness with connecting rod 118.The 3rd, this Lenkradschlossvorrichtung is when long-time the use, owing to wear and tear between the component of machine, it is big that the mechanical engagement gap becomes, and occurs the insecure situation of locking easily.
Therefore, how to prolong hydraulic ram in the Lenkradschlossvorrichtung service life, reduce wear, reduce that material requires and the reliability that further improves blocking device is the present technical issues that need to address of those skilled in the art.
Summary of the invention
The purpose of this invention is to provide a kind of steering swivel system that is used on the construction machinery and equipment; This steering swivel system can significantly improve the service life of piston in the Lenkradschlossvorrichtung, the reliability that reduces wear, reduces the material requirement and further improve blocking device, and another object of the present invention provides a kind of construction machinery and equipment that comprises above-mentioned steering swivel system.
For solving the problems of the technologies described above; The present invention provides a kind of steering swivel system; Comprise axletree, the wheel flutter that links to each other with axletree and wheel pivoted arm, steering jack, and limit the blocking device that said wheel flutter turns to, the control cock that said blocking device comprises hydraulic actuating cylinder and controls flow break-make in the said hydraulic actuating cylinder; One end of said hydraulic actuating cylinder is connected with said axletree, and an other end is connected with said wheel pivoted arm.
Preferably; Be provided with left piston and right piston in the cylinder barrel of said hydraulic actuating cylinder; Said left piston and said right piston are divided into left chamber, intermediate cavity and right chamber with the inner chamber of said cylinder barrel, and the cooresponding cylinder barrel of said intermediate cavity is provided with the projective structure that protrudes and separate said left piston and right piston with respect to inner wall of cylinder, and said right piston is provided with through hole; Piston rod is arranged at the right-hand member of said cylinder barrel; And pass said through hole slidably and get into said intermediate cavity, the wall of said piston rod and said through hole is sealed and matched, and the maximum gauge of the piston head of said piston rod is greater than said through-hole diameter; And have diameter clearance with said projective structure, three chambers in the said cylinder barrel are communicated with fuel tank through the passage that has said control cock.
Preferably; Said passage comprises the left connection pipe that is communicated with said left chamber, the right connection pipe that is communicated with said right chamber and the intermediate connection tube that is communicated with said intermediate cavity; Said left connection pipe, said right connection pipe and said intermediate connection tube link to each other with three hydraulic fluid ports of said control cock one side respectively, and three hydraulic fluid ports of said control cock opposite side link to each other with the leakage oil duct.
Preferably, said cylinder barrel comprises the left cylinder barrel of coaxial arrangement, middle cylinder barrel and right cylinder barrel, and the internal diameter of said middle cylinder barrel is less than the internal diameter of said left cylinder barrel and said right cylinder barrel, and said projective structure is formed at the inside part of said middle cylinder barrel.
Preferably, said in the middle of the outer end of cylinder barrel form step in the position that joins with said left cylinder barrel and said right cylinder barrel, the height of said step equates with the barrel thickness of said left cylinder barrel and said right cylinder barrel.Preferably, the inner chamber equal and opposite in direction of the inner chamber of said left cylinder barrel and said right cylinder barrel.
Preferably, said inner wall of cylinder is provided with a pair of endless loop that keeps at a certain distance away, and said projective structure is the part that said endless loop protrudes said inner wall of cylinder.
Preferably, said inner wall of cylinder setting has the ring-type tube of certain axial width, and said projective structure is the part that said ring-type tube protrudes said inner wall of cylinder.
Preferably, said piston head comprises that said piston rod top and fixed cover are loaded on the endless member on said piston rod top.
The present invention also provides a kind of construction machinery and equipment, comprises chassis and steering swivel system, and said steering swivel system comprises above-mentioned each described steering swivel system.
Steering swivel system provided by the present invention, the control cock that its Lenkradschlossvorrichtung comprises hydraulic actuating cylinder and controls flow break-make in the said hydraulic actuating cylinder is when said control cock is closed; Flow in the said hydraulic actuating cylinder keeps stabilized conditions; Piston rod is not made fore and aft motion, and said hydraulic actuating cylinder length remains unchanged, simultaneously; Because an end of said hydraulic actuating cylinder is connected with said axletree; An other end is connected with said wheel pivoted arm, and said wheel pivoted arm will remain unchanged with the position of said axletree when said control cock is closed, and wheel can't deflection; When said control cock was opened, said piston rod freely stretched, and wheel can deflection and then turned to.Said Lenkradschlossvorrichtung is installed on the axletree, when receiving to turn to about steering hardware the impact of pulling force less, prolonged service life of hydraulic ram, reduced the material requirement of hydraulic ram.And adopt the hydraulic actuating cylinder locking, because the lubricating effect of flow, the wearing and tearing of component of machine are less.
A kind of preferred embodiment in; Be provided with left piston and right piston in the cylinder barrel of said hydraulic actuating cylinder; Said left piston and said right piston are divided into left chamber, intermediate cavity and right chamber with the inner chamber of said cylinder barrel, and the cooresponding cylinder barrel of said intermediate cavity is provided with the projective structure that protrudes and separate said left piston and right piston with respect to inner wall of cylinder, and said right piston is provided with through hole; Piston rod is arranged at the right-hand member of said cylinder barrel; And pass said through hole slidably and get into said intermediate cavity, the wall of said piston rod and said through hole is sealed and matched, and the maximum gauge of the piston head of said piston rod is greater than said through-hole diameter; And have diameter clearance with said projective structure, three chambers in the said cylinder barrel are communicated with fuel tank through the passage that has said control cock.During release, said piston rod is in the process of stretching out, because projective structure; Said left piston is motionless, and said right piston moves right with said piston rod, and said right chamber volume diminishes; It is big that said intermediate cavity volume becomes, and in the indentation process, said right piston is motionless; Said left piston is promoted left by said piston rod, said left chamber smaller volume, and it is big that said intermediate cavity volume becomes.When said left piston and said right piston are in said projective structure two ends, closed control valve, said wheel flutter is locked, because the restriction of projective structure, confirms that easily hydraulic actuating cylinder should blocked position, and then more accurately controls the latched position of wheel.Simultaneously, said left piston and said right piston are in the service life that turns to the time-division to go into operation to do to help to prolong piston.
In another preferred embodiment; Said passage comprises the left connection pipe that is communicated with said left chamber, the right connection pipe that is communicated with said right chamber and the intermediate connection tube that is communicated with said intermediate cavity; Said left connection pipe, said right connection pipe and said intermediate connection tube link to each other with three hydraulic fluid ports of said control cock one side respectively, and three hydraulic fluid ports of said control cock opposite side link to each other with the leakage oil duct.Said control cock can be controlled the break-make of said passage easily, and said control cock with leak oil duct and link to each other, hydraulic actuating cylinder in-to-in hydraulic oil liquid can circulate with hydraulic efficiency pressure system.
Description of drawings
Fig. 1 is a kind of representative type steering swivel system scheme drawing;
Fig. 2 is a kind of representative type Lenkradschlossvorrichtung scheme drawing;
Fig. 3 is the structural representation of a kind of specific embodiment of steering swivel system provided by the present invention;
Fig. 4 is the cross-sectional schematic of the Lenkradschlossvorrichtung in a kind of specific embodiment of steering swivel system provided by the present invention;
The view that Fig. 5 stretches out for piston rod in the Lenkradschlossvorrichtung shown in Figure 4 fully;
The view that Fig. 6 is fully retracted for piston rod in the Lenkradschlossvorrichtung shown in Figure 4.
The specific embodiment
Core of the present invention provides a kind of steering swivel system that is used on the construction machinery and equipment; This steering swivel system can significantly improve the service life of piston in the Lenkradschlossvorrichtung, the reliability that reduces wear, reduces the material requirement and further improve blocking device, and another object of the present invention provides a kind of construction machinery and equipment that comprises above-mentioned steering swivel system.
In order to make those skilled in the art person understand the present invention program better, the present invention is done further detailed description below in conjunction with the accompanying drawing and the specific embodiment.
Please refer to Fig. 3, Fig. 3 is the structural representation of a kind of specific embodiment of steering swivel system provided by the present invention, and Fig. 4 is the cross-sectional schematic of the Lenkradschlossvorrichtung in a kind of specific embodiment of steering swivel system provided by the present invention.
In a kind of specific embodiment; Steering swivel system provided by the present invention; Comprise axletree 1, the wheel flutter 7 that links to each other with axletree 1 and wheel pivoted arm 6, steering jack 5 (being connected with a pair of steering jack on the axletree usually), and limit the blocking device that wheel flutter 7 turns to, blocking device comprises the control cock 3 of flow break-make in hydraulic actuating cylinder 2 and the modulated pressure cylinder 2; One end of hydraulic actuating cylinder 2 is connected with axletree 1, and an other end is connected with wheel pivoted arm 6.
As shown in Figure 3, when control cock 3 was closed, the liquid in the hydraulic actuating cylinder 2 did not flow, and its piston can not move, and piston rod is not made fore and aft motion, and the entire length of hydraulic actuating cylinder 2 will remain unchanged.Because hydraulic actuating cylinder 2 one ends are connected with axletree 1, an other end is connected with wheel pivoted arm 6, and the length distance between two point of connection is also constant; Therefore wheel pivoted arm 6 can not rotate with respect to axletree 1; Angle between axletree 1 and the wheel flutter 7 remains unchanged, and at this moment, wheel flutter 7 is locked; Can not freely rotate to both sides, this hydraulic actuating cylinder has just played the effect of Lenkradschlossvorrichtung.
When needs wheel flutter 7 turned to, control cock 3 was opened, and turned to oil circuit 5 fluid to be provided to steering jack 4; Steering jack 4 is made fore and aft motion and is driven 6 rotations of wheel pivoted arm; At this moment, hydraulic actuating cylinder 2 can stretch under the promotion of wheel pivoted arm 6, and the rotation of wheel pivoted arm 6 no longer is restricted; Wheel flutter 7 can be realized freely turning to respect to axletree 1 deflection certain angle under the effect of wheel pivoted arm 6.
The hydraulic actuating cylinder 2 that plays locking action is installed on the axletree 1, when receiving to turn to about steering gear connection mechanism the impact of pulling force less, prolong service life of hydraulic actuating cylinder, reduce the material requirement of hydraulic actuating cylinder.And adopt the hydraulic actuating cylinder locking, because the lubricating effect of flow, the wearing and tearing of component of machine are less.
In the another kind of specific embodiment; As shown in Figure 4; Be provided with left piston 22 and right piston 23 in the cylinder barrel 21 of hydraulic actuating cylinder 2, left piston 22 and right piston 23 are divided into left chamber 211, intermediate cavity 212 and right chamber 213 with the inner chamber of cylinder barrel 21, and intermediate cavity 212 cooresponding cylinder barrels 21 are provided with respect to cylinder barrel 21 inwalls protrusion and separate left piston 22 and the projective structure 28 of right piston 23; Right piston 23 is provided with through hole; Piston rod 24 is arranged at the right-hand member of cylinder barrel 21, and passes through hole entering intermediate cavity 212 slidably, and piston rod 24 is sealed and matched with the wall of through hole; Be to have excellent sealing performance between right piston 23 and the piston rod 24, guarantee that again piston rod 24 can slide in through hole.
The maximum gauge of the piston head 241 of piston rod 24 is greater than the through-hole diameter on the right piston 23, and like this, piston rod 24 can not pass right piston in the process that moves to right, and moves to right together but spur right piston 23.Can piston rod 24 top fixed covers be loaded in the endless member, form the piston head 241 that diameter increases, also can the piston head 241 of maximum gauge greater than through-hole diameter directly be processed on piston rod 24 tops.
Have diameter clearance between projective structure 28 and the piston head 241, guarantee that piston rod 24 is free to stretch.
Three chambers in the cylinder barrel 21 are communicated with the fuel tank (not shown) through the passage that has control cock 3.The passage that three chambers are communicated with fuel tank can comprise the left connection pipe 25 that is communicated with left chamber 211, the right connection pipe 27 that is communicated with right chamber 213 and the intermediate connection tube 26 that is communicated with intermediate cavity 212.Left side connection pipe 25, intermediate connection tube 26 and right connection pipe 27 link to each other with three hydraulic fluid ports of control cock 3 one sides respectively; I.e. first hydraulic fluid port 31, second hydraulic fluid port 32 and the 3rd hydraulic fluid port 33, three hydraulic fluid ports of control cock 3 opposite sides (i.e. the 4th hydraulic fluid port 34, the 5th hydraulic fluid port 35 and the 6th hydraulic fluid port 36) with leak oily oil duct (not shown) and link to each other.Use a control cock 3 can control closing of left connection pipe 25, intermediate connection tube 26 and right connection pipe 27 simultaneously and be communicated with; And with leak oil duct and link to each other; Hydraulic actuating cylinder 2 in-to-in hydraulic oil liquids can circulate with hydraulic efficiency pressure system, and when closing hydraulic fluid port, hydraulic actuating cylinder 2 is in the lock state; During unlatching, hydraulic actuating cylinder 2 is in released state.
Piston rod 24 in the process of stretching out since projective structure 28 left ends stop that left piston 22 can not move right, left chamber's 211 constancies of volume.The maximum gauge of piston head 241 is greater than through-hole diameter; Therefore piston rod 24 can move right by the right piston 23 of pulling in the process of moving to right, and hydraulic fluid port 33 is to system's oil extraction, and hydraulic fluid port 32 is from system's oil-feed; Right chamber 213 volumes diminish gradually; Intermediate cavity 212 volumes become greatly gradually, and shown in Figure 5 for right chamber 213 volumes reach minimum state, promptly piston rod 24 moves to the low order end of cylinder barrel; In the piston rod 24 indentation processes, right piston 23 is stopped by the right-hand member of projective structure, can not be moved to the left; Right chamber 213 constancies of volume, left piston 22 is promoted left by piston rod 24, and hydraulic fluid port 31 is to system's oil extraction; Hydraulic fluid port 32 is from system's oil-feed, and left chamber's 211 volumes diminish gradually, and intermediate cavity 212 volumes become big gradually; Shown in Figure 6 for right chamber 211 volumes reach minimum state, promptly piston rod 24 moves to the high order end of cylinder barrel.
When left piston 22 and right piston 23 are in the two ends of projective structure 28, closed control valve 3, hydraulic actuating cylinder 2 length are locked, can modulated pressure cylinder 2 installation sites, wheel flutter 7 is locked in the position that needs, normally be locked in midway location.Because the restriction of projective structure 28 can be locked in the position that needs with wheel flutter 7 more accurately, is convenient to control.And the structure of this piston rod and double-piston separation type, left and right sides piston is shared out the work and help one another, help to prolong the service life of piston, further guarantee the particularity of locking.
When forming projective structure 28; Can cylinder barrel 21 be processed into left cylinder barrel 214, middle cylinder barrel 215 and the right cylinder barrel 216 that comprises coaxial arrangement; The internal diameter of middle cylinder barrel 215 is less than the internal diameter of left cylinder barrel 214 and right cylinder barrel 216; The inside part of cylinder barrel 215 was as shown in Figure 4 in the middle of projective structure 28 was formed at.Middle cylinder barrel 215 forms step 29 in the position that joins with left cylinder barrel 214 and right cylinder barrel 216, and the height of step 29 equates with the barrel thickness of left cylinder barrel 214 and right cylinder barrel 216.The installation of convenient left cylinder barrel 214 of the ledge structure of middle cylinder barrel 215 and right cylinder barrel 216, and leak tightness is strong, can also sealing member be set in the position that step 29 and left cylinder barrel 214 and right cylinder barrel 216 join, further enhanced leaktightness performance.
The inner chamber of left side cylinder barrel 214 and the inner chamber of right cylinder barrel 216 can be equal-sized, and piston rod 24 is when indentation and stretching motion, and loading process is consistent; Maximum displacement is consistent; The maximum steering angle of wheel flutter 7 about in steering procedure is also consistent, is convenient to control, and meets primary demand.
When forming projective structure 28, can also be at a pair of endless loop of a solid-end cylinder 21 inner installations.Endless loop can be directly to be close to cylinder barrel 21 inwalls to install; Also can be to be embedded in cylinder barrel 21 walls and radially to extend to cylinder barrel 21 inner chambers; The endless loop of protrusion inner wall of cylinder partly forms projective structure 28; The distance that this a pair of endless loop is certain at interval, the motion of left piston 22 and right piston 23 is with the restriction that receives left endless loop and right endless loop respectively, and the chamber that forms between the endless loop of the left and right sides is the intermediate cavity 212 of minimum volume.Endless loop is simple in structure, is convenient to install and processing.
When forming projective structure 28, can also directly be close to inner wall of cylinder and install and have certain axial width ring-type tube, or be embedded in cylinder barrel 21 walls and radially extend to inner cavity of cylinder.The ring-type tube of protrusion inner wall of cylinder partly forms projective structure 28, and end limits the motion of left piston 22 and right piston 23 respectively about it, and the inner chamber of ring-type tube is the intermediate cavity 212 of minimum volume.Ring-type tube simple installation, and crush resistance is strong.
Except above-mentioned steering swivel system, the present invention also provides a kind of construction machinery and equipment that comprises above-mentioned steering swivel system, and the structure of other each several parts of this project machinery please refer to prior art, and this paper repeats no more.
More than steering swivel system construction machinery and equipment provided by the present invention and steering swivel system thereof have been carried out detailed introduction.Used concrete example among this paper principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof.Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of claim of the present invention.
Claims (10)
1. steering swivel system; Comprise axletree (1), the wheel flutter (7) that links to each other with axletree (1) and wheel pivoted arm (6), steering jack (4); And limit the blocking device that said wheel flutter (7) turns to, it is characterized in that the control cock (3) that said blocking device comprises hydraulic actuating cylinder (2) and controls flow break-make in the said hydraulic actuating cylinder (2); One end of said hydraulic actuating cylinder (2) is connected with said axletree (1), and an other end is connected with said wheel pivoted arm (6).
2. according to the said steering swivel system of claim 1; It is characterized in that; Be provided with left piston (22) and right piston (23) in the cylinder barrel (21) of said hydraulic actuating cylinder (2); Said left piston (22) and said right piston (23) are divided into left chamber (211), intermediate cavity (212) and right chamber (213) with the inner chamber of said cylinder barrel, and the cooresponding cylinder barrel of said intermediate cavity (212) (21) is provided with the projective structure (28) that protrudes and separate said left piston (22) and right piston (23) with respect to cylinder barrel (21) inwall, and said right piston (23) is provided with through hole; Piston rod (24) is arranged at the right-hand member of said cylinder barrel (21); And pass said through hole slidably and get into said intermediate cavity (212), said piston rod (24) is sealed and matched with the wall of said through hole, and the maximum gauge of the piston head (241) of said piston rod (24) is greater than said through-hole diameter; And have diameter clearance with said projective structure (28), three chambers in the said cylinder barrel (21) are communicated with fuel tank through the passage that has said control cock (3).
3. according to the said steering swivel system of claim 2; It is characterized in that; Said passage comprises the left connection pipe (25) that is communicated with said left chamber (211), the right connection pipe (27) that is communicated with said right chamber (213) and the intermediate connection tube (26) that is communicated with said intermediate cavity (212); Said left connection pipe (25), said right connection pipe (27) and said intermediate connection tube (26) link to each other with three hydraulic fluid ports of said control cock (3) one sides respectively, and three hydraulic fluid ports of said control cock opposite side link to each other with the leakage oil duct.
4. according to the said steering swivel system of claim 3; It is characterized in that; Said cylinder barrel (21) comprises the left cylinder barrel (214) of coaxial arrangement, middle cylinder barrel (215) and right cylinder barrel (216); The internal diameter of cylinder barrel (215) is less than the internal diameter of said left cylinder barrel (214) and said right cylinder barrel (216) in the middle of said, and said projective structure (28) is formed at the inside part of said middle cylinder barrel (215).
5. according to the said steering swivel system of claim 4; It is characterized in that; The outer end of cylinder barrel (215) forms step (29) in the position that joins with said left cylinder barrel (214) and said right cylinder barrel (216) in the middle of said, and the height of said step (29) equates with the barrel thickness of said left cylinder barrel (214) and said right cylinder barrel (216).
6. according to the said steering swivel system of claim 5, it is characterized in that the inner chamber equal and opposite in direction of the inner chamber of said left cylinder barrel (214) and said right cylinder barrel (216).
7. according to the said steering swivel system of claim 3, it is characterized in that said cylinder barrel (21) inwall is provided with a pair of endless loop that keeps at a certain distance away, said projective structure (28) protrudes the part of said cylinder barrel (21) inwall for said endless loop.
8. according to the said steering swivel system of claim 3, it is characterized in that said inner wall of cylinder setting has the ring-type tube of certain axial width, said projective structure (28) protrudes the part of said cylinder barrel (21) inwall for said ring-type tube.
9. according to claim above-mentioned 2 to 8 each said steering swivel systems, it is characterized in that said piston head (241) comprises that said piston rod (24) top and fixed cover are loaded on the endless member on said piston rod (24) top.
10. a construction machinery and equipment comprises chassis and the steering swivel system that links to each other with the chassis, it is characterized in that, said steering swivel system is above-mentioned 1 to 9 each described steering swivel system.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102503187A CN102372024A (en) | 2010-08-05 | 2010-08-05 | Engineering machine and steering system thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102503187A CN102372024A (en) | 2010-08-05 | 2010-08-05 | Engineering machine and steering system thereof |
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| CN102372024A true CN102372024A (en) | 2012-03-14 |
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| CN2010102503187A Pending CN102372024A (en) | 2010-08-05 | 2010-08-05 | Engineering machine and steering system thereof |
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| CN104176119A (en) * | 2014-08-19 | 2014-12-03 | 徐州重型机械有限公司 | Steering system and crane |
| CN104295557A (en) * | 2014-10-09 | 2015-01-21 | 徐州重型机械有限公司 | Neutral position locking oil cylinder and engineering van |
| CN112141208A (en) * | 2019-06-26 | 2020-12-29 | 广州汽车集团股份有限公司 | Vehicle steering control structure, vehicle suspension structure and vehicle |
| CN112145603A (en) * | 2019-06-26 | 2020-12-29 | 广州汽车集团股份有限公司 | Vehicle shock absorber, vehicle suspension structure and vehicle |
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| CN112141208A (en) * | 2019-06-26 | 2020-12-29 | 广州汽车集团股份有限公司 | Vehicle steering control structure, vehicle suspension structure and vehicle |
| CN112145603A (en) * | 2019-06-26 | 2020-12-29 | 广州汽车集团股份有限公司 | Vehicle shock absorber, vehicle suspension structure and vehicle |
| CN112141208B (en) * | 2019-06-26 | 2022-03-15 | 广州汽车集团股份有限公司 | Vehicle steering control structure, vehicle suspension structure and vehicle |
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Application publication date: 20120314 |