Hydraulic steering chassis and fresh corn harvester
Through the design of the hydraulic steering chassis, the structure is simplified, the steering bridge is abolished, and the small steering radius and flexible steering are achieved, which solves the problems of large turning radius and complex structure of traditional fresh corn harvesters, and improves the traffic capacity and maintenance convenience.
Patent Information
- Application Number
- CN202421793918.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-26
- Publication Date
- 2025-08-15
- Estimated Expiration
- 2034-07-26
AI Technical Summary
The traditional fresh corn harvester has a large turning radius and requires a steering bridge. It has a complex structure and is not easy to maintain. It has poor passability when it is on the ground and during transitions.
The hydraulic steering chassis is adopted, including the front frame, articulated frame, rear frame, pin shaft, connecting shaft and steering system. Steering is achieved through steering cylinder and flow amplifier, canceling the steering bridge, simplifying the structure, improving flexibility and maintenance convenience.
A small steering radius and flexible steering are achieved, which reduces overall costs, improves traffic capacity and maintenance convenience under complex terrain, and reduces space occupation.
Smart Images
Figure CN223224401U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of agricultural machinery, in particular to a hydraulic steering chassis. In addition, the utility model also relates to a fresh corn harvester comprising the hydraulic steering chassis. Background Art
[0002] A fresh corn harvester is a piece of machinery used to harvest fresh corn. Fresh corn is highly sought after for its unique flavor, rich nutrition, and low calorie content. In recent years, the area of fresh corn cultivation has continued to increase, with most of the crops being planted in continuous fields. This has led to increasing demands for efficient harvesting by fresh corn harvesters.
[0003] Traditional fresh corn harvesters use an integral chassis with offset wheel steering. This method has a large turning radius, requires a steering axle, has a complex structure, is difficult to maintain, has poor traffic capacity at the edge of the field and when transferring, and requires a large area of open space to be cleared in the corn field for turning, which seriously reduces the harvesting efficiency. Utility Model Content
[0004] The utility model provides a hydraulic steering chassis and a fresh corn harvester to solve the technical problems of existing fresh corn harvesters, such as large turning radius, need for a steering bridge, complex structure, difficulty in maintenance, and poor traffic capacity at the end of the field and during transfer.
[0005] According to one aspect of the utility model, a hydraulic steering chassis is provided, comprising a front frame, an articulated frame, a rear frame, a pin shaft, a connecting shaft and a steering system, wherein the front frame and the articulated frame are hinged via the pin shaft, the articulated frame and the rear frame are hinged via the connecting shaft, the axis of the pin shaft is arranged perpendicular to the axis of the connecting shaft, the steering system comprises a steering cylinder, a flow amplifier, a steering pump and an oil tank, the two steering cylinders are symmetrically arranged on both sides of the pin shaft, and the two ends of the steering cylinder are respectively hinged to the front frame and the articulated frame, and the steering pump supplies oil to the steering cylinder via the flow amplifier.
[0006] Furthermore, a first articulated seat is arranged on the front frame, and a second articulated seat corresponding to the first articulated seat is arranged on the articulated frame, and the first articulated seat and the second articulated seat are hinged via the pin shaft.
[0007] Furthermore, a plurality of the first hinge seats are coaxially arranged.
[0008] Furthermore, a first bearing is provided on the articulated frame, a second bearing is provided on the rear frame, and both ends of the connecting shaft are connected to the first bearing and the second bearing respectively.
[0009] Furthermore, the connecting shaft is a stepped shaft.
[0010] Furthermore, the flow amplifier includes a cycloid pair and a core valve sleeve, and the core valve sleeve is provided with a valve sleeve oil inlet, an axial groove, an amplified axial groove and a flow amplification port. The hydraulic oil entering the flow amplifier is divided into two paths, one path enters the steering cylinder through the valve sleeve oil inlet, the cycloid pair, and the axial groove; the other path enters the steering cylinder through the flow amplification port, the amplified axial groove, and the axial groove.
[0011] Furthermore, the steering cylinder includes a first steering piston cylinder and a second steering piston cylinder, the L port of the flow amplifier is connected to the rod chamber of the first steering piston cylinder and the rodless chamber of the second steering piston cylinder, and the R port of the flow amplifier is connected to the rodless chamber of the first steering piston cylinder and the rod chamber of the second steering piston cylinder.
[0012] Furthermore, the P port of the flow amplifier is connected to the steering pump via an oil inlet pipeline, the T port of the flow amplifier is connected to the oil tank via an oil return pipeline, and an overflow valve is connected between the oil inlet pipeline and the oil return pipeline.
[0013] Furthermore, an oil return filter is arranged on the oil return pipeline.
[0014] According to another aspect of the present invention, a fresh corn harvester is provided, which includes the above-mentioned hydraulic steering chassis.
[0015] The utility model has the following beneficial effects:
[0016] The hydraulic steering chassis of the utility model has a three-section structure. The front frame and the articulated frame are connected by two steering cylinders. The front and rear frames are made to move relative to each other by controlling the extension and contraction of the two steering cylinders respectively, thereby realizing steering. Compared with the offset wheel steering, the hydraulic steering chassis has a simple structure, a small steering radius, flexible steering, high passability, and does not require a steering axle, which can reduce the overall cost and facilitate maintenance; the articulated frame and the rear frame are hinged by a connecting shaft, so that the rear frame can swing relative to the articulated frame, which can improve the covering ability of the hydraulic steering chassis under complex terrain; the large flow demand of the steering cylinder is met by the flow amplifier, which can reduce the size of the steering system, facilitate installation, and save space on the hydraulic steering chassis.
[0017] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:
[0019] Figure 1 This is a structural diagram of a hydraulic steering chassis in a preferred embodiment of the present utility model;
[0020] Figure 2 It is a cross-sectional view of a hydraulic steering chassis of a preferred embodiment of the present utility model;
[0021] Figure 3 It is a structural diagram of the steering system of the preferred embodiment of the utility model;
[0022] Figure 4 It is a structural schematic diagram of the core valve sleeve of the preferred embodiment of the present utility model.
[0023] Legend:
[0024] 1. Front frame; 11. First articulated seat; 2. Articulated frame; 21. Second articulated seat; 22. First bearing; 3. Rear frame; 31. Second bearing; 4. Pin; 5. Connecting shaft; 6. Steering system; 61. Steering cylinder; 611. First steering piston cylinder; 612. Second steering piston cylinder; 62. Flow amplifier; 621. Cycloid pair; 622. Core valve sleeve; 623. One-way valve; 624. Second relief valve; 625. Oil supply valve; 626. Overload valve; 63. Steering pump; 64. Fuel tank; 65. First relief valve. DETAILED DESCRIPTION
[0025] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in a variety of different ways as defined and covered below.
[0026] Please also refer to Figures 1 to 4 The hydraulic steering chassis of this embodiment includes a front frame 1, an articulated frame 2, a rear frame 3, a pin shaft 4, a connecting shaft 5 and a steering system 6. The front frame 1 and the articulated frame 2 are hinged via the pin shaft 4, and the articulated frame 2 and the rear frame 3 are hinged via the connecting shaft 5. The axis of the pin shaft 4 is arranged perpendicular to the axis of the connecting shaft 5. The steering system 6 includes a steering cylinder 61, a flow amplifier 62, a steering pump 63 and a fuel tank 64. The two steering cylinders 61 are symmetrically arranged on both sides of the pin shaft 4, and the two ends of the steering cylinders 61 are respectively hinged to the front frame 1 and the articulated frame 2. The steering pump 63 supplies oil to the steering cylinder 61 via the flow amplifier 62.
[0027] The hydraulic steering chassis of this embodiment has a three-section structure. The front frame 1 and the articulated frame 2 are connected by two steering cylinders 61. The front and rear frames are moved relative to each other by controlling the extension and contraction of the two steering cylinders 61 respectively, thereby realizing steering. Compared with the eccentric wheel steering, it has a simple structure, a small steering radius, flexible steering, high passability, and does not require a steering axle, which can reduce overall costs and facilitate maintenance; the articulated frame 2 and the rear frame 3 are hinged by the connecting shaft 5, so that the rear frame 3 can swing relative to the articulated frame 2, which can improve the covering ability of the hydraulic steering chassis in complex terrain; the large flow demand of the steering cylinder 61 is met by the flow amplifier 62, which can reduce the size of the steering system 6, facilitate installation, and save space on the hydraulic steering chassis.
[0028] In this embodiment, a first articulated seat 11 is provided on the front frame 1, and a second articulated seat 21 corresponding to the first articulated seat 11 is provided on the articulated frame 2. The first articulated seat 11 and the second articulated seat 21 are hinged through a pin shaft 4; the structure is simple and the flexibility is high.
[0029] In this embodiment, the two first articulated seats 11 are coaxially arranged, and the articulated frame 2 is provided with a second articulated seat 21 corresponding to the first articulated seat 11. The corresponding first articulated seat 11 and the second articulated seat 21 are connected through the pin shaft 4, so that the two pin shafts 4 are coaxially arranged. Compared with the whole-section structure, the articulation method of the two pin shafts 4 can reduce the overall weight, and the gap between the two pin shafts 4 can be used as a passable channel to provide operating space for installing other components.
[0030] In this embodiment, a first bearing 22 is provided on the articulated frame 2, a second bearing 31 is provided on the rear frame 3, and both ends of the connecting shaft 5 are connected to the first bearing 22 and the second bearing 31 respectively, with a simple structure and easy assembly and disassembly.
[0031] In this embodiment, the connecting shaft 5 is a stepped shaft, which can reduce the weight of the connecting shaft 5 on the one hand, and facilitate limiting the axial position of the connecting shaft 5 on the other hand.
[0032] like Figure 3 and Figure 4As shown, in this embodiment, the flow amplifier 62 includes a cycloid pair 621 and a core valve sleeve 622. The core valve sleeve 622 is provided with a valve sleeve oil inlet ④, an axial groove ①, an amplified axial groove ②, and a flow amplification port ③. Hydraulic oil entering the flow amplifier 62 is divided into two paths: one path enters the steering cylinder 61 through the valve sleeve oil inlet ④, the cycloid pair 621, and the axial groove ①; the other path enters the steering cylinder 61 through the flow amplification port ③, the amplified axial groove ②, and the axial groove ①. The flow amplifier 62 meets the high flow demand of the steering cylinder 61, reducing the size of the steering system 6, facilitating installation, and saving space on the hydraulic steering chassis. Due to the characteristics of the flow amplifier 62, the flow amplification factor reaches its maximum when the steering wheel is turned quickly, thereby improving steering efficiency. When the steering wheel is turned slowly, the flow amplification factor is slightly reduced, thereby improving steering precision. Optionally, the flow amplifier 62 is also provided with a one-way valve 623 to prevent backflow of hydraulic oil. Optionally, the flow amplifier 62 is further provided with a second overflow valve 624 for overflow protection. Optionally, the flow amplifier 62 is further provided with an oil replenishment valve 625 for preventing cavitation and replenishing oil to the steering cylinder 61. Optionally, the flow amplifier 62 is further provided with an overload valve 626 for overload protection of the steering cylinder 61.
[0033] like Figure 1 、 Figure 3 and Figure 4As shown, in this embodiment, the steering cylinder 61 includes a first steering piston cylinder 611 and a second steering piston cylinder 612, the L port of the flow amplifier 62 is connected to the rod cavity of the first steering piston cylinder 611 and the rodless cavity of the second steering piston cylinder 612, and the R port of the flow amplifier 62 is connected to the rodless cavity of the first steering piston cylinder 611 and the rod cavity of the second steering piston cylinder 612; when turning right, the steering wheel turns right to drive the cycloid pair 621 to turn right, and the metered flow passing through the cycloid pair 621 and the amplified flow passing through the flow amplifier port ③ enter the rod cavity of the first steering piston cylinder 611 and the rodless cavity of the second steering piston cylinder 612 from the L port together, the first steering piston cylinder 611 retracts, and the second steering piston cylinder 612 extends. Under the action of the two cylinders, the front frame 1 is articulated relative to the frame 2 around the pin 4. When the front frame 1 deflects to the right, the first steering piston cylinder 611 retracts to the extreme position when the front frame 1 deflects to the extreme position, and the steering wheel can no longer be turned; when the front frame 1 deflects to the left, the steering wheel drives the cycloid pair 621 to turn left, and the metered flow through the cycloid pair 621 and the amplified flow through the valve sleeve flow amplification port enter the rodless cavity of the first steering piston cylinder 611 and the rod cavity of the second steering piston cylinder 612 from the R port, the first steering piston cylinder 611 extends, and the second steering piston cylinder 612 retracts. Under the action of the two oil cylinders, the front frame 1 deflects to the left relative to the articulated frame 2 around the pin shaft 4. When the front frame 1 deflects to the extreme position, the second steering piston cylinder 612 retracts to the extreme position, and the steering wheel can no longer be turned; the maximum steering angle is limited by the piston cylinder's own stroke, which has a simple structure and is easy to operate.
[0034] In this embodiment, the P port of the flow amplifier 62 is connected to the steering pump 63 via an oil inlet pipeline, and the T port of the flow amplifier 62 is connected to the fuel tank 64 via an oil return pipeline. A first overflow valve 65 is connected between the oil inlet pipeline and the oil return pipeline. During straight-line driving, the steering wheel remains in the neutral position, the cycloid pair 621 is in the neutral position, and the flow of the steering pump 63 overflows from the first overflow valve 65 back to the fuel tank 64.
[0035] In this embodiment, an oil return filter is arranged on the oil return pipeline, which can filter out pollutants generated by the steering system 6 itself or invaded from the outside before the hydraulic oil enters the oil tank 64, thereby ensuring the normal operation of the steering system 6.
[0036] A fresh corn harvester comprises the above-mentioned hydraulic steering chassis.
[0037] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.
Claims
1. A hydraulic steering chassis, characterized in that: It includes a front frame (1), an articulated frame (2), a rear frame (3), a pin shaft (4), a connecting shaft (5) and a steering system (6). The front frame (1) and the articulated frame (2) are hinged via the pin shaft (4), the articulated frame (2) and the rear frame (3) are hinged via the connecting shaft (5), and the axis center line of the pin shaft (4) and the axis center line of the connecting shaft (5) are arranged perpendicularly. The steering system (6) comprises a steering oil cylinder (61), a flow amplifier (62), a steering pump (63) and an oil tank (64). The two steering oil cylinders (61) are symmetrically arranged on both sides of the pin shaft (4), and the two ends of the steering oil cylinder (61) are respectively hinged to the front frame (1) and the articulated frame (2). The steering pump (63) supplies oil to the steering oil cylinder (61) via the flow amplifier (62).
2. The hydraulic steering chassis according to claim 1, characterized in that: A first hinge seat (11) is arranged on the front frame (1), and a second hinge seat (21) corresponding to the first hinge seat (11) is arranged on the articulated frame (2); the first hinge seat (11) and the second hinge seat (21) are hinged via the pin shaft (4).
3. The hydraulic steering chassis according to claim 2, characterized in that: A plurality of the first hinge seats (11) are coaxially arranged.
4. The hydraulic steering chassis according to claim 1, characterized in that: The articulated frame (2) is provided with a first bearing (22), the rear frame (3) is provided with a second bearing (31), and both ends of the connecting shaft (5) are respectively connected to the first bearing (22) and the second bearing (31).
5. The hydraulic steering chassis according to claim 4, characterized in that: The connecting shaft (5) is a stepped shaft.
6. The hydraulic steering chassis according to any one of claims 1 to 5, characterized in that: The flow amplifier (62) comprises a cycloid pair (621) and a core valve sleeve (622). The core valve sleeve (622) is provided with a valve sleeve oil inlet, an axial groove, an amplified axial groove, and a flow amplifier port. The hydraulic oil entering the flow amplifier (62) is divided into two paths. One path enters the steering cylinder (61) through the valve sleeve oil inlet, the cycloid pair, and the axial groove; the other path enters the steering cylinder (61) through the flow amplifier port, the amplified axial groove, and the axial groove.
7. The hydraulic steering chassis according to claim 6, characterized in that: The steering oil cylinder (61) comprises a first steering piston cylinder (611) and a second steering piston cylinder (612); the L port of the flow amplifier (62) is connected to the rod chamber of the first steering piston cylinder (611) and the rodless chamber of the second steering piston cylinder (612); and the R port of the flow amplifier (62) is connected to the rodless chamber of the first steering piston cylinder (611) and the rod chamber of the second steering piston cylinder (612).
8. The hydraulic steering chassis according to claim 7, characterized in that: The P port of the flow amplifier (62) is connected to the steering pump (63) via an oil inlet pipeline, the T port of the flow amplifier (62) is connected to the oil tank (64) via an oil return pipeline, and a first overflow valve (65) is connected between the oil inlet pipeline and the oil return pipeline.
9. The hydraulic steering chassis according to claim 8, characterized in that: An oil return filter is arranged on the oil return pipeline.
10. A fresh corn harvester, characterized in that: A hydraulic steering chassis comprising the hydraulic steering chassis according to any one of claims 1 to 9.