WO2014075371A1 - 回转支承、臂架系统及举高消防车 - Google Patents
回转支承、臂架系统及举高消防车 Download PDFInfo
- Publication number
- WO2014075371A1 WO2014075371A1 PCT/CN2012/087397 CN2012087397W WO2014075371A1 WO 2014075371 A1 WO2014075371 A1 WO 2014075371A1 CN 2012087397 W CN2012087397 W CN 2012087397W WO 2014075371 A1 WO2014075371 A1 WO 2014075371A1
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- WIPO (PCT)
- Prior art keywords
- ring gear
- ring
- collar
- driving device
- gear
- Prior art date
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- 238000005096 rolling process Methods 0.000 claims description 48
- 239000013598 vector Substances 0.000 description 35
- 238000000034 method Methods 0.000 description 9
- 230000008859 change Effects 0.000 description 7
- 210000001364 upper extremity Anatomy 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000008602 contraction Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/84—Slewing gear
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/50—Other types of ball or roller bearings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C23/00—Bearings for exclusively rotary movement adjustable for aligning or positioning
- F16C23/06—Ball or roller bearings
- F16C23/08—Ball or roller bearings self-adjusting
Definitions
- the invention relates to the technical field of engineering machinery, in particular to a boom system of a boom-type construction machine such as a crane, a concrete pump truck, a special-purpose vehicle such as an aerial work vehicle, a lift fire truck, and the slewing support thereof.
- a boom system of a boom-type construction machine such as a crane, a concrete pump truck, a special-purpose vehicle such as an aerial work vehicle, a lift fire truck, and the slewing support thereof.
- boom system such as cranes, concrete pump trucks
- special vehicles such as aerial work vehicles, lift fire trucks
- the extension of the boom system is used to expand the work area, generally using
- the lift cylinder lifts the boom to extend the entire boom and transport the person or object to a predetermined work area for the purpose of its work.
- the boom needs to be in a level before it is stretched.
- the fire truck the ladder fire truck, the climbing platform fire truck, the lift truck, etc.
- vehicles often park on a road with a certain slope, and then adjust the state of the vehicle in various ways, so that the boom (ladder) can be adjusted to a level, and rescue, Fire fighting operations.
- the high-rise fire trucks are equipped with slewing bearings to realize the rotation of the boom (ladder).
- the swing supports can be used in many forms, such as the outer ring gear form and the inner ring gear form.
- Lifting fire trucks are generally equipped with four legs and are supported by leg cylinders.
- FIG. 1 is a schematic structural view of a conventional high-rise fire truck parked on a sloped ground.
- the lift fire truck includes a work bucket 10, a boom 20', a lift cylinder 30, and a turntable 40'. Slewing ring 50 ', frame 70', front leg cylinder 80' and rear leg cylinder 90'.
- the amount of expansion and contraction of the front and rear leg cylinders can be adjusted to adjust the boom (ladder) into a horizontal state, and rescue and fire fighting operations can be started.
- the adjustable angle of the fire truck is 5 °; the European standard stipulates that the adjustable angle of the lift truck needs 8 °; that is, the lift truck can have 5 ° (or 8 °) in the parking position.
- the slope is leveled and operated.
- the span of the legs front and rear span, left and right span
- the span of the legs are designed to be large (about 4M-6M) to ensure sufficient support plane to prevent vehicle operation. Tilting, in order to achieve leveling by adjusting the leg cylinders in the case of large spans, the leg cylinders generally need to be made quite long, and the cylinder diameter needs to be appropriately increased to ensure sufficient pressure bar stability.
- the outrigger cylinder is too long and too heavy, and it is difficult to design and manufacture;
- the leveling speed is slow, the leg cylinder needs to ensure a certain degree of motion accuracy to ensure the accuracy of the adjustment angle, can not quickly extend;
- the leveling accuracy is general, because it is a four-point support (for the statically indeterminate structure), and the cylinder itself has a certain elasticity (for oil compression), resulting in a lot of repeated control in the leveling;
- Embodiments of the present invention provide a slewing bearing that can be self-adjusting to achieve an engineering machine with a boom system and a dedicated vehicle to conveniently level up the vehicle when parked on a sloped ground.
- the embodiment of the invention provides a slewing bearing, comprising a first collar and a second collar, the slewing bearing further comprising a first ring gear, a second ring gear, a first ring rolling member, a second ring rolling member, a three-ring rolling member, a first driving device, a second driving device and a third driving device, wherein the first ring gear and the second ring gear are disposed between the first collar and the second collar , the first collar Cooperating with the first ring gear by the first ring rolling member and forming a first pair of rotating surface groups, and the second ring rolling member passes between the first ring gear and the second ring gear Combining and forming a second pair of rotating surface groups, wherein the second ring gear and the second ring ring are combined by the third ring rolling member and form a third pair of rotating surface groups, the second pair of rotating surface groups
- the set is inclined at an angle with respect to the first pair of revolution surface groups and the second pair of rotation surface groups, and the first driving
- the inner surface of the first ring gear is provided with a first driving ring gear at the top, and the first driving ring gear is horizontally disposed around the inner surface of the first ring gear, and the first driving device is configured Gear drive, the gear of the first drive device mates with the first drive ring gear.
- the inner surface of the first ring gear is provided with a second driving ring gear at the bottom, the second driving ring gear is disposed obliquely around the inner surface of the first ring gear, and the second driving device is The gear is driven, and the gear of the second driving device cooperates with the second driving ring gear.
- an inner surface of the second ring gear is provided with a third driving ring gear at a bottom portion, and the third driving ring gear is horizontally disposed around an inner surface of the second ring gear, and the third driving device is configured The gear is driven, and the gear of the third driving device cooperates with the third driving ring gear.
- first collar is sleeved on a top outer circumference of the first ring gear
- first ring rolling member is disposed on an inner surface of the first collar and an outer surface of the first ring gear Between the first rolling elements is disposed horizontally around the outer circumference of the first ring gear.
- a top of the second ring gear is sleeved on a bottom outer circumference of the first ring gear, and a second ring rolling member is disposed on an inner surface of the second ring gear top and the first ring gear Between the outer surfaces of the bottom, the second ring rolling member is disposed obliquely around the outer circumference of the first ring gear.
- the second collar is sleeved on the outer circumference of the bottom of the second ring gear
- the third ring rolling member is disposed on the inner surface of the second collar and the outer surface of the second ring gear
- Between the third ring rolling members is disposed horizontally around the outer circumference of the second ring gear.
- the embodiment of the present invention further provides a boom system, including a boom, a lift cylinder, a turntable, and a frame, wherein the boom is mounted on the turntable through the lift cylinder, and the lift fire truck further includes
- the slewing bearing is disposed between the turret and the frame and the turret is rotatably coupled to the frame; the first collar of the slewing ring is fixed to the turret The second collar of the slewing ring is fixedly connected to the frame.
- the first driving device of the slewing bearing is fixed on the turntable
- the second driving device of the slewing bearing is fixed on the second ring gear
- the third driving device of the slewing bearing is fixed at the Said on the frame.
- Embodiments of the present invention also provide an elevated fire truck, including a work bucket and the above-described boom system, the work bucket being mounted on a boom of the boom system.
- the slewing bearing provided by the above embodiment is configured to pass the second pair of rotating surface groups relative to the other two pairs of ⁇ groups (ie, the first pair of rotating surface groups and the second pair of rotating surfaces) Group) It has a tilted angle design and can adjust the angle to realize the angle adjustment of the turntable relative to the frame at 0° to 8°. It is not necessary to adjust the expansion and contraction of the front and rear leg cylinders to achieve the leveling of the vehicle top.
- FIG. 1 is a schematic structural view of a conventional lift fire truck parked on a sloped ground;
- FIG. 2 is a schematic structural view of a high fire truck parking on a sloped ground provided by an embodiment of the present invention
- FIG. 3 is a cross-sectional structural view of a slewing bearing according to an embodiment of the present invention.
- Figure 4 is a diagram showing the relationship between the respective revolution planes and vectors of the slewing ring according to the embodiment of the present invention.
- FIG. 5 is a rotation trajectory diagram of the vector n2 when the P3 plane is rotated around the n4 vector in the slewing bearing according to the embodiment of the present invention
- Fig. 6 is a simplified schematic diagram of the model principle for realizing the angular change of the vector nl relative to the vector n6 in the slewing bearing according to the embodiment of the present invention. detailed description
- the lift fire truck includes a work bucket 10, a boom 20, a lift cylinder 30, a turntable 40, Slewing bearing 60, frame 70, front leg cylinder 80 and rear leg cylinder 90.
- the work bucket 10 is mounted on the end of the boom 20 for carrying and transporting personnel, disaster relief tools or supplies.
- the boom 20, also referred to as a ladder frame, is mounted on the turntable 40 by a lift cylinder 30; the boom 20 can be a telescoping boom or a truss boom.
- the lift cylinder 30 connects the boom 20 and the turntable 40, and the extension of the boom 20 is achieved by the expansion and contraction of the cylinder.
- the turntable 40 is mounted on a self-adjusting angle slewing bearing 60, and the entire top loading (i.e., the work bucket 10, the boom 20, the lift cylinder 30, and the turntable 40) is rotated by the swing reducer.
- the front leg cylinder 80 and the rear leg cylinder 90 are fixed to the frame 70 for forming support during the entire vehicle operation.
- the frame 70 is used to connect the vehicle chassis and the swing support 60 to withstand the forces of the entire upper and front leg cylinders 80 and the rear leg cylinders 90.
- the swivel support 60 is disposed between the turntable 40 and the frame 70 and rotatably connects the turntable 40 to the frame 70 such that the turntable 40 is rotatable relative to the frame 70 under the support of the slewing bearing 60.
- the self-adjusting angle slewing bearing 60 provided by the embodiment of the present invention can achieve the upper leveling.
- FIG. 3 is a cross-sectional structural view of a slewing bearing 60 according to an embodiment of the present invention.
- the slewing bearing 60 includes a first collar 61a, a second collar 61b, a first ring gear 62, a second ring gear 63, a first ring rolling member 64, a second ring rolling member 65, and a third ring rolling member 66.
- the first set of rings 61a is fixedly connected to one of the turntable 40 and the frame 70.
- the first set of rings 61a and the bottom of the turntable 40 are fixedly connected by, for example, bolts; the second set of rings 61b and the turntable 40 and the frame
- the other of the 70 is fixedly connected.
- the second collar 61b is fixedly coupled to the top of the frame 70 by, for example, a bolt. Gp, the first set of rings 61a and the second set of rings 61b are disposed axially opposite each other.
- the first ring gear 62 and the second ring gear 63 are axially sleeved between the first collar 61a and the second collar 61b.
- the inner surface of the first ring gear 62 is respectively provided with a first driving ring gear 621 and a second driving ring gear 622 at the top and the bottom, wherein the first driving ring gear 621 is horizontally disposed around the inner surface of the first ring gear 62, and The second drive ring gear 622 is disposed obliquely around the inner surface of the first ring gear 62; the first set of rings 61a is sleeved on the outer periphery of the top of the first ring gear 62, and the inner surface of the first set of rings 61a and the first ring gear 62 A first ring rolling member 64 is disposed between the outer surfaces, and the first ring rolling member 64 is horizontally disposed around the outer circumference of the first ring gear 62.
- the inner surface of the second ring gear 63 is provided with a third driving ring gear 631 at the bottom, and the third driving ring gear 631 is horizontally disposed around the inner surface of the second ring gear 63; the top of the second ring gear 63 is sleeved at the first
- a second circumference rolling member 65 is disposed between the inner surface of the second ring gear 63 and the bottom outer surface of the first ring gear 62, and the second ring rolling member 65 is inclined around the outer circumference of the first ring gear 62.
- a second drive ring gear 622 that is disposed and inclined with respect to the first ring gear 62 is provided.
- the second collar 61b is sleeved on the outer circumference of the bottom of the second ring gear 63, and the third ring rolling member 66 is disposed between the inner surface of the second collar 61b and the outer surface of the second ring gear 63.
- the third ring rolling member 66 It is disposed horizontally around the outer circumference of the second ring gear 63.
- the first ring rolling member 64, the second ring rolling member 65, and the third ring rolling member 66 are balls, and a pair of balls are disposed on each pair of bonding faces.
- each rolling element can also adopt its His form is replaced by a roller bearing, a needle bearing or a slider.
- the first driving device 67 is fixed on the turntable 40 for driving the turntable 40 and the first collar 61a to rotate together with respect to the first ring gear 62; the second driving device 68 is fixed on the second ring gear 63 for driving the first The ring gear 62 is rotated relative to the second ring gear 63; the third driving device 69 is fixed to the frame 70 for driving the second ring gear 63 to rotate relative to the second collar 61b and the frame 70.
- the first driving device 67, the second driving device 68, and the third driving device 69 are all driven by a gear, and adopt a structure with a gear of a rotary reducer, and the gears of each driving device are respectively coupled with the first ring gear.
- the first driving device 67 When the first driving device 67 is in operation, its gear crawls along the first driving ring gear 621 at the top of the first ring gear 62, and the first driving device 67 performs a circular motion around the first driving ring gear 621 to drive the turntable 40 and The first set of rings 61a rotates to achieve relative rotation between the first ring gear 62 and the first collar 61a.
- the second drive unit 68 When the second drive unit 68 is in operation, its gear cooperates with the second drive ring gear 622 at the bottom of the first ring gear 62 and drives the first ring gear 62 to rotate relative to the second ring gear 63.
- the third drive unit 69 When the third drive unit 69 is in operation, its gear cooperates with the third drive ring gear 631 at the bottom of the second ring gear 63 and drives the second ring gear 63 to rotate relative to the second collar 61b and the frame 70. That is, in the present embodiment, the first driving device 67 will perform a circular motion while running, while the second driving device 68 and the third driving device 69 are fixed at the time of operation, at this point A drive unit 67 differs from the second drive unit 68 and the third drive unit 69.
- FIG. 4 shows the relationship between the respective planes of rotation of the slewing bearing 60 and the vector, where n1 is the vector of the P1 plane passing through the central axis of the first ring rolling member 64; n2 is the P2 plane passing the first circle a vector of the central axis of the rolling member 64; n3 is a vector of the P3 plane passing the central axis of the second rolling element 65; n4 is a vector of the P4 plane passing the central axis of the second rolling element 65; n5 is the P5 plane passing the third circular rolling element A vector of 66 central axes; n6 is a vector of P6 planes passing through the central axis of the third circle of rolling elements 66.
- the plane P1 is the lower plane of the turntable 40 (or the upper plane of the first collar 61a), and its plane normal vector is n1, which is connected to the boom 20 through the turntable 40, and can be realized by the first driving device 67.
- the PI plane rotates around the n2 vector.
- the plane P2 is the driving ring gear surface at the top of the first ring gear 62, and its plane normal vector is n2, and the first driving device 67 drives the P1 plane to rotate around the ring gear of the P2 plane.
- the P3 plane is the driving ring gear surface at the bottom of the first ring gear 62, and its plane normal vector is n3.
- the P3 plane can be rotated around the n4 vector by the second driving device 68; the P3 plane and the P2 plane are fixed rigid connections, because P2 The P3 plane is formed together on the first ring gear 62.
- the linkage causes the rotation and skew of the n2 vector.
- the P3 plane rotates ⁇ around n4.
- ⁇ 3 drives the ⁇ 2 plane to rotate, the normal vector ⁇ 2 of ⁇ 2 will be rotated according to the rotation trajectory (track circle 0 in Fig. 5) and deflected to the position of ⁇ 2' in the figure, which causes the inclination of the ⁇ 2 plane to be ⁇ ° .
- the ⁇ 4 plane is the support surface of the ⁇ 3 plane, that is, the top inclined surface of the second ring gear 63, the normal vector is ⁇ 4, the ⁇ 4 vector coincides with the ⁇ 3 vector, and ⁇ 3 makes a rotary motion around ⁇ 4.
- the ⁇ 5 plane is the bottom inner ring gear surface of the second ring gear 63, and its plane normal vector is ⁇ 5.
- the third driving device 69 can realize the ⁇ 5 plane rotating around the ⁇ 6 vector; the ⁇ 5 plane and the ⁇ 4 plane are fixed rigid connections, because ⁇ 4 The ⁇ 5 plane is formed together on the second ring gear 63.
- the ⁇ 5 plane rotates around the ⁇ 6 vector, the ⁇ 5 vector will drive the ⁇ 4 vector to rotate together; in addition, the second driving device 68 is mounted on the ⁇ 5 plane, when the ⁇ 5 plane rotates The second driving device 68 will be driven to rotate.
- the ⁇ 5 vector drives the ⁇ 4 vector to rotate
- the ⁇ 2, ⁇ 3 plane does not change with respect to the ⁇ 4 vector angle. Therefore, when the ⁇ 5 vector is rotated around the ⁇ 6 vector, the ⁇ 4, ⁇ 3, and ⁇ 2 vectors are rotated as a whole.
- the ⁇ 6 plane is the frame of the frame 70, which is the plane of the vehicle body. Its normal vector is ⁇ 6, which coincides with the normal direction of the ground stopped by the whole vehicle.
- the principle of the angle adjustment of the slewing bearing 60 is:
- the ultimate goal of the embodiment of the present invention is to achieve nl relative to n6 in any direction to achieve the angle change of the turntable 40 relative to the frame 70 at 0° to 8° (according to European standards), due to nl, n2 Coincident, omitting n2, another n3, n4 coincide, omitting n4, according to the above explanation, the model principle is simplified as shown in Fig. 6.
- Nl is driven by the second driving device 68, around n3 Perform a rotary motion to obtain ⁇ , achieve an angular change of 0° to 8° in the fixed direction, and stop the motion after obtaining the required angle. Since the second driving device 68 is fixed on the crucible 5, when n5 is rotated about ⁇ 6, the whole rotation in the direction of ⁇ 3 and ⁇ is driven to realize the change in any direction, and finally the angle adjustment purpose is achieved.
- the slewing bearing 60 of the embodiment of the present invention has three pairs of rotating surface groups, and the first set of rings 61a and the first ring gear 62 are combined by the first rolling element 64 to form a first pair of rotating surface groups (ie, P1).
- the first ring gear 62 and the second ring gear 63 are combined by the second ring rolling member 65 and form a second pair of turning surface groups (ie, P3 and P4 quilts), and the second ring gear 63 is
- the second sets of rings 61b are joined by a third ring rolling member 66 and form a third pair of rotating surface groups (ie, P5 and P6 quilts), and a rolling member is used to realize a slewing support between each pair of quilts;
- the P3 surface is formed with an inclined angle design with respect to the P2 surface, and the first ring gear 62 is designed as a unitary structure, the P4 surface of the second ring gear 63 is formed at an oblique angle with respect to the P5 surface, and the second ring gear 63 is designed as a unitary structure.
- the second pair of turning surface groups are inclined at an angle relative to the other two pairs of quilts (ie, the first pair of rotating surface groups and the second pair of rotating surface groups), such that when n3 is rotated around n4, P3 Drive Pl, P2 quilt rotation, maximum Pl, P2 quilt and P 5.
- a change of the angle of inclination of 2 times is formed between P6; the second driving device 68 is fixed on the surface of P5, and when the surface of P5 is rotated around the surface of n6, the plane of P1, P2, P3, P4, P5 is rotated around n6 to make an overall rotation. , so that the angle is inclined in any direction.
- the slewing bearing of the embodiment of the invention can realize the angle adjustment of the turret relative to the frame at 0° to 8°, and of course, by adjusting the angles of the P3 and P4 planes to achieve other angle changes, more can be realized. Angle adjustment.
- each driving motor is disposed on each driving ring gear of the embodiment of the present invention, and of course, the number of driving motors can be increased on each driving ring gear.
- each driving ring gear and each driving motor in the embodiment of the present invention is set as a spur gear.
- the helical gear can also be used to cooperate to drive the rotation of the ring gear.
- each ring gear ie, the first ring gear and the second ring gear
- the axial height of the wall surface of each ring gear (ie, the first ring gear and the second ring gear) of the embodiment of the present invention gradually changes along the circumferential direction, and each ring gear has a wedge shape, of course, each ring gear.
- the axial heights of the wall surfaces may also be equal in the circumferential direction, and it is only necessary to ensure that the second pair of revolution surface groups formed by the combination of the first ring gear and the second ring gear are opposite to the other two pairs of surface groups (ie, the first pair of revolution surfaces)
- the group and the second pair of rotating surface groups have a tilted angle design, so that the vehicle top angle leveling function of the embodiment of the invention can be realized.
- first collar of the embodiment of the invention is fixedly connected with the turntable, and the second collar is fixedly connected with the frame; of course, the first collar and the second collar can also be reversely arranged, that is, the first collar It is fixedly connected to the frame, and the second ring is fixedly connected with the turntable, which is also the same principle for angle leveling.
- the embodiment of the invention aims to protect a self-adjusting angle slewing bearing and a boom system using the slewing bearing, which can be applied to engineering machines (such as cranes, concrete pump trucks) and special vehicles having a boom system (such as aerial work vehicles, lifting high fire trucks).
- engineering machines such as cranes, concrete pump trucks
- special vehicles having a boom system such as aerial work vehicles, lifting high fire trucks.
- the existing leg leveling can only achieve the adjustment of the angle of 5 ° at most due to the limitation of the length of the leg cylinder, and the embodiment of the invention can realize the adjustment of the maximum 8 ° angle;
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Abstract
一种回转支承,包括第一套环(61a)、第二套环(61b)、第一齿圈(62)、第二齿圈(63)、第一圈滚动件(64)、第二圈滚动件(65)、第三圈滚动件(66)、第一驱动装置(67)、第二驱动装置(68)及第三驱动装置(69),第一齿圈(62)和第二齿圈(63)设置在第一套环(61a)与第二套环(61b)之间,第一套环(61a)与第一齿圈(62)之间通过第一圈滚动件(64)结合并形成第一对回转面组,第一齿圈(62)与第二齿圈(63)之间通过第二圈滚动件(65)结合并形成第二对回转面组,第二齿圈(63)与第二套环(61b)之间通过第三圈滚动件(66)结合并形成第三对回转面组,第二对回转面组相对第一对回转面组和第三对回转面组呈倾斜夹角,第一驱动装置(67)用于驱动第一齿圈(62)相对第一套环(61a)回转,第二驱动装置(68)用于驱动第一齿圈(62)相对第二齿圈(63)回转,第三驱动装置(69)用于驱动第二齿圈(63)相对第二套环(61b)回转。
Description
回转支承、 臂架系统及举高消防车
技术领域
本发明涉及工程机械技术领域, 尤其是涉及一种起重机、 混凝土泵车 等臂架式工程机械和高空作业车、 举高消防车等专用车辆的臂架系统及其 回转支承。 背景技术
在当前具有臂架系统的工程机械 (例如起重机、 混凝土泵车) 和专用 车辆 (例如高空作业车、 举高消防车) 中, 都是利用臂架系统的伸展来扩 大工作区域, 一般是利用举升油缸对臂架进行举升, 以使整个臂架伸展, 将人或物输送到预定的工作区域, 达到其工作的目的。
因应国家安全标准的规定, 臂架在伸展之前, 需要确保臂架已处于水 平状态。 例如, 针对举高消防车 (云梯消防车、 登高平台消防车、 举高喷 射车等), 在实施救援、 灭火作业前, 根据国家标准强制要求, 需要调整臂 架 (云梯) 进入水平状态, 以保证作业的安全。 考虑到救援、 灭火的紧急 性、 特殊性, 车辆经常会驻车在具有一定坡度的路面上, 然后通过各种方 式来调整车辆的状态, 使臂架 (云梯) 调整进入水平状态, 展开救援、 灭 火作业。
举高消防车都安装有回转支承, 以实现臂架 (云梯) 的回转, 回转支 承为了实现特殊的目的, 有很多种形式, 如外齿圈形式、 内齿圈形式等。 举高消防车一般都安装有四个支腿, 并通过支腿油缸实现支撑。
请参照图 1, 图 1为现有举高消防车驻车在坡度地面上的结构示意图, 该举高消防车包括工作斗 10, 、 臂架 20 ' 、 举升油缸 30, 、 转台 40 ' 、 回转支承 50 ' 、 车架 70 ' 、 前支腿油缸 80 ' 和后支腿油缸 90 ' 。 当举高
消防车驻车在有坡度的地面时, 可以通过调整前后支腿油缸的伸缩量以实 现臂架 (云梯) 调整进入水平状态, 展开救援、 灭火作业。
当前国家标准规定, 举高消防车的可调整角度需要 5 ° ; 欧洲标准规 定, 举高消防车的可调整角度需要 8 ° ; 即举高消防车可以在驻车位置具 有 5 ° (或 8 ° ) 的坡度情况下调平并作业。 通常为了保证实现整车作业的 稳定性, 支腿的跨距 (前后跨距、 左右跨距) 都设计得很大 (约 4M-6M不 等), 以保证足够的支撑平面, 防止车辆作业时倾翻, 为了实现在大跨距情 况下能够通过调整支腿油缸实现调平, 支腿油缸一般需要做得相当长, 并 需要适当的增加油缸直径以保证足够的压杆稳定。
整体而言, 上述通过调整支腿油缸实现调平的方案存在如下问题:
1、 支腿油缸过长、 过重, 设计及制造难以实现;
2、 调平速度慢, 支腿油缸需要保证一定的运动精度以保证调整角度的 准确性, 无法快速伸出;
3、 调平精度一般, 由于是四点支撑 (为超静定结构), 且油缸本身具 有一定的弹性 (为油液压缩), 导致在调平时需要进行大量的反复控制;
4、 当支腿跨距较大时, 且需要调整更大的角度时 (如按照欧洲标准调 整到 8 ° ), 现有技术非常难实现 (油缸需要超长、 存在无法安装等问题)。 发明内容
本发明实施例提供了一种回转支承, 其可自调整角度, 以实现具有臂 架系统的工程机械及专用车辆当驻车在坡度地面上时, 方便地对车辆进行 上装调平。
本发明实施例提供一种回转支承, 包括第一套环与第二套环, 所述回 转支承还包括第一齿圈、 第二齿圈、 第一圈滚动件、 第二圈滚动件、 第三 圈滚动件、 第一驱动装置、 第二驱动装置及第三驱动装置, 所述第一齿圈 和所述第二齿圈设置在所述第一套环与所述第二套环之间, 所述第一套环
与所述第一齿圈之间通过所述第一圈滚动件结合并形成第一对回转面组, 所述第一齿圈与所述第二齿圈之间通过所述第二圈滚动件结合并形成第二 对回转面组, 所述第二齿圈与所述第二套环之间通过所述第三圈滚动件结 合并形成第三对回转面组, 所述第二对回转面组相对所述第一对回转面组 和所述第二对回转面组呈倾斜夹角, 所述第一驱动装置用于驱动所述第一 齿圈相对所述第一套环回转, 所述第二驱动装置用于驱动所述第一齿圈相 对所述第二齿圈回转, 所述第三驱动装置用于驱动所述第二齿圈相对所述 第二套环回转。
进一步地, 所述第一齿圈的内表面于顶部设有第一驱动齿圈, 所述第 一驱动齿圈为环绕所述第一齿圈的内表面水平设置, 所述第一驱动装置采 用齿轮驱动, 所述第一驱动装置的齿轮与所述第一驱动齿圈配合。
进一步地, 所述第一齿圈的内表面于底部设有第二驱动齿圈, 所述第 二驱动齿圈为环绕所述第一齿圈的内表面倾斜设置, 所述第二驱动装置采 用齿轮驱动, 所述第二驱动装置的齿轮与所述第二驱动齿圈配合。
进一步地, 所述第二齿圈的内表面于底部设有第三驱动齿圈, 所述第 三驱动齿圈为环绕所述第二齿圈的内表面水平设置, 所述第三驱动装置采 用齿轮驱动, 所述第三驱动装置的齿轮与所述第三驱动齿圈配合。
进一步地, 所述第一套环套设在所述第一齿圈的顶部外周, 所述第一 圈滚动件设置在所述第一套环的内表面与所述第一齿圈的外表面之间, 所 述第一圈滚动件为围绕所述第一齿圈的外周水平设置。
进一步地, 所述第二齿圈的顶部套设在所述第一齿圈的底部外周, 所 述第二圈滚动件设置在所述第二齿圈顶部的内表面与所述第一齿圈底部的 外表面之间, 所述第二圈滚动件围绕所述第一齿圈的外周倾斜设置。
进一步地, 所述第二套环套设在所述第二齿圈的底部外周, 所述第三 圈滚动件设置在所述第二套环的内表面与所述第二齿圈的外表面之间, 所 述第三圈滚动件为围绕所述第二齿圈的外周水平设置。
本发明实施例还提供一种臂架系统, 包括臂架、 举升油缸、 转台、 车 架, 所述臂架通过所述举伸油缸安装在所述转台上, 所述举高消防车还包 括上述的回转支承, 所述回转支承设于所述转台与所述车架之间并将所述 转台可回转地与所述车架连接; 所述回转支承的第一套环与所述转台固定 连接, 所述回转支承的第二套环与所述车架固定连接。
进一步地, 所述回转支承的第一驱动装置固定在所述转台上, 所述回 转支承的第二驱动装置固定在所述第二齿圈上, 所述回转支承的第三驱动 装置固定在所述车架上。
本发明实施例还提供一种举高消防车, 包括工作斗和上述的臂架系统, 所述工作斗安装在所述臂架系统的臂架上。
本发明实施例提供的技术方案带来的有益效果是: 上述实施例提供的 回转支承, 通过将第二对回转面组相对其他两对面组 (即第一对回转面组 和第二对回转面组) 呈倾斜夹角设计, 可自调整角度, 实现转台相对车架 在 0° 至 8° 的角度调整, 无需通过调整前后支腿油缸的伸缩量来实现车辆 上装的调平。 附图说明
为了更清楚地说明本发明实施例中的技术方案, 下面将对实施例描述 中所需要使用的附图作简单地介绍, 显而易见地, 下面描述中的附图仅仅 是本发明的一些实施例, 对于本领域普通技术人员来讲, 在不付出创造性 劳动的前提下, 还可以根据这些附图获得其他的附图。
图 1是现有举高消防车驻车在坡度地面上的结构示意图;
图 2是本发明实施例提供的举高消防车驻车在坡度地面上的结构示意 图;
图 3是本发明实施例提供的回转支承的剖视结构示意图;
图 4是本发明实施例提供的回转支承的各个回转平面与向量之间的关
系图;
图 5是本发明实施例提供的回转支承中, P3平面围绕 n4向量旋转时, 向量 n2的旋转轨迹图;
图 6是本发明实施例提供的回转支承中, 向量 nl相对向量 n6实现角 度变化的模型原理简化图。 具体实施方式
为使本发明的目的、 技术方案和优点更加清楚, 下面将结合附图对本 发明实施方式作进一步地详细描述。
请参照图 2,是本发明实施例提供的一种举高消防车驻车在坡度地面上 的结构示意图, 该举高消防车包括工作斗 10、 臂架 20、 举升油缸 30、 转台 40、 回转支承 60、 车架 70、 前支腿油缸 80和后支腿油缸 90。
工作斗 10安装在臂架 20的末端上, 用于承载和运送人员、 救灾工具 或物资等。 臂架 20, 也可称为梯架, 其通过举伸油缸 30安装在转台 40上; 臂架 20可以为伸缩式臂架或者桁架式臂架。 举伸油缸 30连接臂架 20和转 台 40, 通过油缸伸缩实现臂架 20的举伸。 转台 40安装在可自调整角度的 回转支承 60上, 通过回转减速机带动整个上装 (即工作斗 10、 臂架 20、 举伸油缸 30和转台 40)进行回转。前支腿油缸 80和后支腿油缸 90固定在 车架 70上, 用于形成整车作业时的支撑。 车架 70用于连接车辆底盘和回 转支承 60, 承受整个上装及前支腿油缸 80、 后支腿油缸 90的力。 回转支 承 60设于转台 40与车架 70之间并将转台 40可回转地与车架 70连接, 使 转台 40在回转支承 60的支撑下可相对车架 70回转。
通常举高消防车在进行正常作业时, 需要保证上装的水平状态, 当车 辆驻车在非水平地面时, 本发明实施例提供的可自调整角度的回转支承 60 可以实现上装调平。
请参照图 3, 图 3为本发明实施例提供的回转支承 60的剖视结构示意
图, 回转支承 60包括第一套环 61a、 第二套环 61b、 第一齿圈 62、 第二齿 圈 63、 第一圈滚动件 64、 第二圈滚动件 65、 第三圈滚动件 66、 第一驱动 装置 67、 第二驱动装置 68及第三驱动装置 69。
第一套环 61a与转台 40和车架 70中的其中一个固定连接, 本实施例 中第一套环 61a与转台 40的底部通过例如螺栓固定连接; 第二套环 61b与 转台 40和车架 70中的另一个固定连接, 本实施例中第二套环 61b与车架 70的顶部通过例如螺栓固定连接。 gp, 第一套环 61a与第二套环 61b轴向 地相对设置。
第一齿圈 62和第二齿圈 63轴向地套设在第一套环 61a与第二套环 61b 之间。
第一齿圈 62的内表面于顶部和底部分别设有第一驱动齿圈 621和第二 驱动齿圈 622, 其中第一驱动齿圈 621为环绕第一齿圈 62的内表面水平设 置, 而第二驱动齿圈 622为环绕第一齿圈 62的内表面倾斜设置; 第一套环 61a套设在第一齿圈 62的顶部外周, 第一套环 61a的内表面与第一齿圈 62 的外表面之间设置第一圈滚动件 64, 第一圈滚动件 64围绕第一齿圈 62的 外周水平设置。
第二齿圈 63的内表面于底部设有第三驱动齿圈 631,第三驱动齿圈 631 为环绕第二齿圈 63的内表面水平设置; 第二齿圈 63的顶部套设在第一齿 圈 62的底部外周, 第二齿圈 63的内表面与第一齿圈 62的底部外表面之间 设置第二圈滚动件 65, 第二圈滚动件 65围绕第一齿圈 62的外周倾斜设置 且与第一齿圈 62倾斜的第二驱动齿圈 622相对应。第二套环 61b套设在第 二齿圈 63的底部外周, 第二套环 61b的内表面与第二齿圈 63的外表面之 间设置第三圈滚动件 66, 第三圈滚动件 66围绕第二齿圈 63的外周水平设 置。
在本实施例中, 第一圈滚动件 64、 第二圈滚动件 65 和第三圈滚动件 66为滚珠, 每一对结合面上设置一圈滚珠。 当然, 各滚动件还可以采用其
他形式例如滚子轴承、 滚针轴承或者滑块等替代。
第一驱动装置 67固定在转台 40上, 用于驱动转台 40和第一套环 61a 一起相对第一齿圈 62回转; 第二驱动装置 68固定在第二齿圈 63上, 用于 驱动第一齿圈 62相对第二齿圈 63回转; 第三驱动装置 69固定在车架 70 上, 用于驱动第二齿圈 63相对第二套环 61b和车架 70回转。 在本实施例 中, 第一驱动装置 67、 第二驱动装置 68及第三驱动装置 69均采用齿轮驱 动, 采用由回转减速机带有齿轮的结构, 各驱动装置的齿轮分别与第一齿 圈 62或第二齿圈 63内表面的驱动齿圈对应配合。第一驱动装置 67运行时, 其齿轮沿着第一齿圈 62顶部的第一驱动齿圈 621爬行, 第一驱动装置 67 在第一驱动齿圈 621上绕行做圆周运动, 带动转台 40和第一套环 61a—起 转动, 从而实现第一齿圈 62与第一套环 61a之间的相对回转。 第二驱动装 置 68运行时, 其齿轮与第一齿圈 62底部的第二驱动齿圈 622配合并驱动 第一齿圈 62相对第二齿圈 63回转。 第三驱动装置 69运行时, 其齿轮与第 二齿圈 63底部的第三驱动齿圈 631配合并驱动第二齿圈 63相对第二套环 61b和车架 70回转。 也即, 在本实施例中, 第一驱动装置 67在运行时会绕 行做圆周运动, 而第二驱动装置 68和第三驱动装置 69在运行时的位置固 定不变, 在这一点上第一驱动装置 67 与第二驱动装置 68、 第三驱动装置 69有所不同。
请结合参照图 4, 图 4示出了回转支承 60的各个回转平面与向量之间 的关系, 其中 nl是 P1平面过第一圈滚动件 64中心轴线的向量; n2是 P2 平面过第一圈滚动件 64中心轴线的向量; n3是 P3平面过第二圈滚动件 65 中心轴线的向量; n4是 P4平面过第二圈滚动件 65中心轴线的向量; n5是 P5平面过第三圈滚动件 66中心轴线的向量; n6是 P6平面过第三圈滚动件 66中心轴线的向量。
P1平面为转台 40的下平面 (或第一套环 61a的上平面), 其平面法向 量为 nl, 通过转台 40与臂架 20连接, 并通过第一驱动装置 67可以实现
PI平面围绕 n2向量旋转。
P2平面为第一齿圈 62顶部的驱动齿圈面, 其平面法向量为 n2, 第一 驱动装置 67驱动 P1平面围绕 P2平面的齿圈旋转。
P3平面为第一齿圈 62底部的驱动齿圈面, 其平面法向量为 n3, 通过 第二驱动装置 68可以实现 P3平面围绕 n4向量旋转; P3平面与 P2平面是 固定的刚性连接, 因为 P2、 P3平面是共同形成在第一齿圈 62上, 当 P3平 面围绕 n4向量旋转时, 将连动引起 n2向量的旋转和偏斜。 如图 5所示, 当 P3平面围绕 n4旋转 α 。 时, Ρ3带动 Ρ2平面旋转, Ρ2的法向量 η2将会 按照旋转轨迹 (图 5中的轨迹圆 0)进行旋转、 偏斜至图中 η2'的位置, 其 引起 Ρ2平面的倾角为 θ ° 。
Ρ4平面为 Ρ3平面的支撑面, 即为第二齿圈 63的顶部倾斜表面, 其法 向量为 η4, η4向量与 η3向量重合, η3围绕 η4做回转运动。
Ρ5平面为第二齿圈 63的底部内齿圈面, 其平面法向量为 η5, 通过第 三驱动装置 69可以实现 Ρ5平面围绕 η6向量旋转; Ρ5平面与 Ρ4平面是固 定的刚性连接, 因为 Ρ4、 Ρ5平面是共同形成在第二齿圈 63上, 当 Ρ5平面 围绕 η6向量旋转时, η5向量将带动 η4向量一起转动; 另外, 第二驱动装 置 68安装在 Ρ5平面上, 当 Ρ5平面转动时, 将带动第二驱动装置 68—起 转动, 因此, 当 η5向量带动 η4向量转动时, Ρ2、 Ρ3平面相对 η4向量角度 不发生变化。 所以 η5向量绕 η6向量转动时, 将带动 η4、 η3、 η2向量做整 体回转。
Ρ6平面为车架 70平面, 即为车身平面, 其法向量为 η6, 与整车所停 地面法向重合。
回转支承 60 的角度调整原理为: 本发明实施例的最终目的是实现 nl 相对 n6在任意方向实现转台 40相对车架 70在 0° 至 8° (按欧洲标准) 的角度变化, 由于 nl、 n2重合, 省略 n2, 另 n3、 n4重合, 省略 n4, 根据 以上阐述, 模型原理简化如图 6所示。 nl 由第二驱动装置 68驱动, 绕 n3
进行回转运动得到 ηΓ, 实现固定方向上 0° 至 8° 的角度变化, 在得到所 需要的角度后停止运动。 由于第二驱动装置 68固定在 Ρ5上, 当 η5绕 η6 做旋转运动时, 将带动 η3和 ηΓ进行方向上的整体回转, 实现任意方向上 的变化, 最终实现角度调整目的。
综合上述, 本发明实施例的回转支承 60具有三对回转面组, 第一套环 61a与第一齿圈 62之间通过第一圈滚动件 64结合并形成第一对回转面组 (即 P1与 P2面组),第一齿圈 62与第二齿圈 63之间通过第二圈滚动件 65 结合并形成第二对回转面组 (即 P3与 P4面组), 第二齿圈 63与第二套环 61b之间通过第三圈滚动件 66结合并形成第三对回转面组 (即 P5与 P6面 组), 每一对面组之间使用滚动件实现回转支撑; 第一齿圈 62的 P3面相对 P2面形成倾斜角设计, 且第一齿圈 62设计成整体结构, 第二齿圈 63的 P4 面相对 P5面形成倾斜角设计, 且第二齿圈 63设计成整体结构, 使第二对 回转面组 (即 P3、 P4面组)相对其他两对面组 (即第一对回转面组和第二 对回转面组) 呈倾斜夹角设计, 这样当 n3绕 n4旋转时, P3带动 Pl、 P2 面组的转动, 最大可实现 Pl、 P2面组与 P5、 P6之间形成 2倍倾斜夹角的 变化; 第二驱动装置 68固定于 P5面上, 当 P5面绕 n6面转动时, 实现 Pl、 P2、 P3、 P4、 P5平面绕 n6做整体回转, 从而实现夹角向任意方向倾斜。
可以理解的,本发明实施例的回转支承可以实现转台相对车架在 0° 至 8° 的角度调整, 当然通过调整 P3、 P4平面的夹角实现其他角度的变化, 也就可以实现更多其他角度的调整。
可以理解的, 本发明实施例的每个驱动齿圈上只设置了一个驱动马达, 当然在各驱动齿圈上可以增加驱动马达的数量。
可以理解的, 本发明实施例的各驱动齿圈与各驱动马达之间的配合均 设置为直齿轮, 当然也可以使用斜齿轮配合驱动齿圈的回转。
可以理解的, 本发明实施例使用滚珠作为滚动件, 当然也可以使用其 他旋转方式代替滚珠的回转, 比如使用滚子轴承、 滚针轴承、 或者滑块等。
可以理解的, 本发明实施例的每一齿圈 (即第一齿圈和第二齿圈) 的 壁面的轴向高度沿周向逐渐变化, 每一齿圈呈楔形状, 当然每一齿圈的壁 面的轴向高度沿周向也可以都相等, 只需确保第一齿圈与第二齿圈之间相 互结合形成的第二对回转面组相对其他两对面组 (即第一对回转面组和第 二对回转面组) 呈倾斜夹角设计, 即可实现本发明实施例的车辆上装角度 调平功能。
可以理解的, 本发明实施例的第一套环与转台固定连接, 而第二套环 与车架固定连接; 当然第一套环与第二套环也可以反向设置, 即第一套环 与车架固定连接, 而第二套环与转台固定连接, 也是一样可以实现角度调 平的原理。
本发明实施例旨在保护一种可自调整角度的回转支承及运用该回转支 承的臂架系统, 该回转支承可以运用在具有臂架系统的工程机械 (例如起 重机、 混凝土泵车) 和专用车辆 (例如高空作业车、 举高消防车) 中。 可 以理解的, 上述实施例以举高消防车作为实例对回转支承的结构和原理进 行说明, 并非对回转支承的运用进行限制。
本发明实施例提供的回转支承, 相对现有支腿调平具有以下优点:
( 1 ) 现有支腿调平由于支腿油缸长度的限制, 最大只能实现 5 ° 角度 的调整, 本发明实施例可实现最大 8 ° 角的调整;
(2 )现有支腿调平时由于支腿油缸本身的弹性和精度等问题, 需要反 复调整实现车身角度的变化, 而本发明实施例通过水平传感器的反馈控制 驱动马达, 可实现快速, 精准的角度调整, 在需要高空救援等时间要求比 较高的举高消防车上, 具有极大的时间优势;
( 3 )现有支腿调平时需要支腿油缸的大行程调平, 所以支腿及支腿油 缸通常设计比较大和笨重, 占用空间较大, 而使用本发明实施例作为主要 调平方法, 支腿的布置和结构将更加灵活, 对于空间形式复杂、 狭窄的街 道等地方, 具有很大的空间优势。
需要说明的是, 在本文中, 术语 "包括"、 "包含"或者其任何其他变 体意在涵盖非排他性的包含, 从而使得包括一系列要素的过程、 方法、 物 品或者设备不仅包括那些要素, 而且还包括没有明确列出的其他要素, 或 者是还包括为这种过程、 方法、 物品或者设备所固有的要素。 在没有更多 限制的情况下, 由语句 "包括一个…… " 限定的要素, 并不排除在包括所 述要素的过程、 方法、 物品或者设备中还存在另外的相同要素。
以上所述仅为本发明的较佳实施例, 并不用以限制本发明, 凡在本发 明的精神和原则之内, 所作的任何修改、 等同替换、 改进等, 均应包含在 本发明的保护范围之内。
Claims
1、 一种回转支承, 包括第一套环与第二套环, 其特征在于: 所述回转 支承还包括第一齿圈、 第二齿圈、 第一圈滚动件、 第二圈滚动件、 第三圈滚 动件、 第一驱动装置、 第二驱动装置及第三驱动装置, 所述第一齿圈和所述 第二齿圈设置在所述第一套环与所述第二套环之间,所述第一套环与所述第 一齿圈之间通过所述第一圈滚动件结合并形成第一对回转面组,所述第一齿 圈与所述第二齿圈之间通过所述第二圈滚动件结合并形成第二对回转面组, 所述第二齿圈与所述第二套环之间通过所述第三圈滚动件结合并形成第三 对回转面组,所述第二对回转面组相对所述第一对回转面组和所述第二对回 转面组呈倾斜夹角,所述第一驱动装置用于驱动所述第一齿圈相对所述第一 套环回转, 所述第二驱动装置用于驱动所述第一齿圈相对所述第二齿圈回 转, 所述第三驱动装置用于驱动所述第二齿圈相对所述第二套环回转。
2、 如权利要求 1所述的回转支承, 其特征在于, 所述第一齿圈的内表 面于顶部设有第一驱动齿圈,所述第一驱动齿圈为环绕所述第一齿圈的内表 面水平设置, 所述第一驱动装置采用齿轮驱动, 所述第一驱动装置的齿轮与 所述第一驱动齿圈配合。
3、 如权利要求 1或 2所述的回转支承, 其特征在于, 所述第一齿圈的 内表面于底部设有第二驱动齿圈,所述第二驱动齿圈为环绕所述第一齿圈的 内表面倾斜设置, 所述第二驱动装置采用齿轮驱动, 所述第二驱动装置的齿 轮与所述第二驱动齿圈配合。
4、 如权利要求 3所述的回转支承, 其特征在于, 所述第二齿圈的内表 面于底部设有第三驱动齿圈,所述第三驱动齿圈为环绕所述第二齿圈的内表
面水平设置, 所述第三驱动装置采用齿轮驱动, 所述第三驱动装置的齿轮与 所述第三驱动齿圈配合。
5、 如权利要求 1所述的回转支承, 其特征在于, 所述第一套环套设在 所述第一齿圈的顶部外周,所述第一圈滚动件设置在所述第一套环的内表面 与所述第一齿圈的外表面之间,所述第一圈滚动件为围绕所述第一齿圈的外 周水平设置。
6、 如权利要求 1或 5所述的回转支承, 其特征在于, 所述第二齿圈的 顶部套设在所述第一齿圈的底部外周,所述第二圈滚动件设置在所述第二齿 圈顶部的内表面与所述第一齿圈底部的外表面之间,所述第二圈滚动件围绕 所述第一齿圈的外周倾斜设置。
7、 如权利要求 6所述的回转支承, 其特征在于, 所述第二套环套设在 所述第二齿圈的底部外周,所述第三圈滚动件设置在所述第二套环的内表面 与所述第二齿圈的外表面之间,所述第三圈滚动件为围绕所述第二齿圈的外 周水平设置。
8、 一种臂架系统, 包括臂架、 举升油缸、 转台、 车架, 所述臂架通过 所述举伸油缸安装在所述转台上, 其特征在于: 还包括如权利要求 1至 7任 一项所述的回转支承,所述回转支承设于所述转台与所述车架之间并将所述 转台可回转地与所述车架连接;所述回转支承的第一套环与所述转台固定连 接, 所述回转支承的第二套环与所述车架固定连接。
9、 如权利要求 8所述的臂架系统, 其特征在于, 所述回转支承的第一 驱动装置固定在所述转台上,所述回转支承的第二驱动装置固定在所述第二
齿圈上, 所述回转支承的第三驱动装置固定在所述车架上。
10、 一种举高消防车, 包括工作斗, 其特征在于: 还包括如权利要求 9 所述的臂架系统, 所述工作斗安装在所述臂架系统的臂架上。
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