Middle power take-off (PTO) control mechanism and tractor with middle power take-off (PTO)
By introducing a wire pulling mechanism into the center PTO control mechanism, the pulling wire drives the swing of the swing of the swing arm in the lever, the problems of large manipulation force and poor comfort in the prior art are solved, and smaller manipulation force and better comfort are achieved, while the leverage ratio is optimized.
Patent Information
- Application Number
- CN202421621930.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-10
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2034-07-10
AI Technical Summary
The existing mid-mounted PTO control mechanism has a large manipulation force, poor handling comfort, and difficult to control the lever ratio, resulting in a further increase in manipulation force.
A mid-mounted PTO operating mechanism including a bracket, pull wire and a mid-mounted PTO housing is adopted. By pulling the pull wire by the control handle, the pull wire drives the swing of the dialing rocker arm, thereby realizing the clutch or shift of the mid-mounted PTO output shaft.
Reduces maneuvering force, improves maneuvering comfort, optimizes the space of the leverage ratio, facilitates control of maneuvering force, and improves installation flexibility.
Smart Images
Figure CN222668873U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of a PTO operating mechanism, in particular to a mid-mounted PTO operating mechanism and a tractor with a mid-mounted PTO. Background Art
[0002] When controlling the clutch or shifting of the tractor's mid-mounted PTO output shaft, an operating mechanism is required. In the existing mid-mounted PTO operating mechanism, the operating handle is welded to the operating shaft, and a support plate is provided on the operating shaft. The support plate is connected to the rocker arm through a pull rod, and a shift head shaft is provided at one end of the rocker arm. When the operating handle is pulled, the operating handle drives the operating shaft to rotate, so that the support plate pulls the rocker arm to swing through the pull rod, and the rocker arm drives the shift head shaft to rotate, so that the shift head on the shift head shaft swings, and the shift head can drive the shift fork to move on the shift fork shaft, thereby realizing the clutch or shifting of the mid-mounted PTO output shaft. When the operating handle is released, the large torsion spring sleeved on the shift head shaft releases the elastic force to achieve reset.
[0003] When the above-mentioned operating mechanism is operated, the operating force is large, the operating comfort is poor, and the large operating force easily exceeds the self-locking gear of the self-locking structure, making it difficult to control. In addition, if the lever ratio is to be increased, the length of the support plate needs to be reduced and the length of the rocker arm needs to be increased. However, the reduction in the length of the support plate means that the vertical motion component is reduced when it swings. When the vertical motion component reaches the limit, the rocker arm cannot continue to swing upward, which means that the rocker arm cannot swing to the original maximum height. Therefore, the original structure lacks space for optimizing the lever ratio, which also makes the operating force large. Utility Model Content
[0004] The technical problem to be solved by the utility model is: how to reduce the operating force of the central PTO operating mechanism and improve the operating comfort.
[0005] The technical solution of the utility model to solve the above technical problems is as follows:
[0006] The utility model provides a mid-mounted PTO operating mechanism, comprising a bracket, a pull wire, and a mid-mounted PTO shell, wherein an operating handle is hinged on the bracket, a shift shaft is provided on the mid-mounted PTO shell, a shift head is provided on the shift shaft, one end of the shift shaft extends out of the mid-mounted PTO shell and is provided with a shift rocker arm; one end of the pull wire shell is connected to the bracket, the other end of the pull wire shell is connected to the mid-mounted PTO shell, one end of the pull wire core is connected to the operating handle, and the other end of the pull wire core is connected to the free end of the shift rocker arm.
[0007] The beneficial effects of the utility model are:
[0008] By adopting the utility model, the pull wire can be pulled when the operating handle is pulled, and the shift rocker arm is swung by pulling the pull wire, the operating force is small, and the operating comfort is improved; when the operating handle moves, the length of the string rotated by the position where the operating handle is connected to the pull wire is the length of the pull wire pulled out, and the length of the pull wire pulled out determines the swing amplitude of the shift rocker arm. It can be inferred that the movement component of the operating handle in the horizontal direction can also effectively drive the shift rocker arm to swing, so that the space for optimizing the lever ratio is large, which is convenient for controlling the operating force; at the same time, the installation direction restriction of the operating handle is reduced, and the installation flexibility is good.
[0009] On the basis of the above technical solution, the present invention can also be improved as follows.
[0010] Furthermore, a first connecting plate is provided at one end of the pull wire housing, and the first connecting plate is connected to the bracket; a second connecting plate is provided at the other end of the pull wire housing, and the second connecting plate is connected to the central PTO housing.
[0011] The pull wire and the bracket can be installed separately, which is easy to install, and it is also convenient to disassemble and replace the pull wire and maintain.
[0012] Furthermore, both ends of the pull wire shell are provided with threaded sections, each threaded section is provided with two adjusting nuts, the two adjusting nuts at one end of the pull wire shell are clamped on both sides of the first connecting plate, and the two adjusting nuts at the other end of the pull wire shell are clamped on both sides of the second connecting plate.
[0013] When adjusting the connection position between the cable and the operating handle and the length of the shift rocker arm, the position of the first connecting plate and the second connecting plate can be changed by adjusting the position of the nut through the knob, thereby changing the extension length of the shell at both ends of the cable, which can adapt to changes in the installation distance and has good flexibility.
[0014] Furthermore, the first connecting plate is connected to the bracket via bolts, and the second connecting plate is connected to the mid-mounted PTO housing via bolts.
[0015] Easy to disassemble and assemble.
[0016] Furthermore, the operating handle is also provided with a handle rocker arm, and one end of the handle rocker arm is fixed to the hinge shaft between the operating handle and the bracket.
[0017] The installation position of the pull wire is provided by the handle rocker arm, so that the extension direction of the operating handle can be flexibly arranged, the flexibility is good, and the operation is convenient.
[0018] Furthermore, the bracket is L-shaped, one end of the bracket extends horizontally, the other end of the bracket extends downward, the operating handle is hinged to the middle of the bracket, and one end of the pull wire housing is connected to the lower end of the bracket.
[0019] The bracket can cover the exposed part of the wire core of the pull wire, which is convenient for protecting the pull wire and improving safety; the lower end of the bracket can be fixed on the floor of the tractor cab, the exposed part of the pull wire is small, and the structure is compact.
[0020] Furthermore, the shift rocker arm is provided with a sleeve and a latch, the sleeve is sleeved on the shift shaft, and the latch passes through the sleeve and the shift shaft.
[0021] The shift rocker arm is connected to the shift shaft through a sleeve and a pin, which is easy to install. The shift rocker arm is detachable, so it is convenient to replace the shift rocker arm of different lengths according to needs, and it is convenient to adjust the operating lever ratio.
[0022] Furthermore, a shift fork shaft is provided in the central PTO housing, a shift fork capable of moving along its own axial direction is provided on the shift fork shaft, and a self-locking structure is provided between the shift fork and the shift fork shaft.
[0023] The self-locking structure can realize self-locking of the gear, which is easy to operate; when pulling the operating handle, you only need to overcome the self-locking structure, the operating force is small, and the operating comfort is good.
[0024] Furthermore, the self-locking structure includes a self-locking groove provided on the fork shaft and a self-locking channel provided in the fork, the self-locking channel is open at one end opposite to the fork shaft, and a spring and a steel ball are sequentially provided in the self-locking channel from the closed end to the open end; when the self-locking channel of the fork moves to the position of the self-locking groove, the spring can press the steel ball into the self-locking channel through its own elastic force.
[0025] When operating the control handle, you only need to overcome the elastic force of the spring when leaving the gear. There is no resistance at other times and the operating force is small. When entering the gear, the steel ball is automatically locked into the groove and the operating resistance is suddenly generated, so it is easy to identify the gear and stop operating, which is very comfortable.
[0026] The utility model also provides a tractor with a mid-mounted PTO, comprising a vehicle body, on which the mid-mounted PTO operating mechanism is installed.
[0027] The central PTO housing of the central PTO operating mechanism is the housing of the central PTO transmission box of the tractor, has small operating force, and improves operating comfort; and has large space for optimizing the lever ratio, which facilitates controlling the operating force. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] Figure 1 It is a structural schematic diagram of the utility model.
[0029] Figure 2 It is a schematic diagram of the structure inside the mid-mounted PTO housing.
[0030] Figure 3 It is a structural schematic diagram of the shift fork.
[0031] In the accompanying drawings, the technical features represented by the reference numerals are as follows:
[0032] 1- bracket; 2- operating handle; 3- pull wire; 4- shift rocker arm; 5- shift shaft; 6- shift head; 7- first connecting plate; 8- second connecting plate; 9- threaded section; 10- adjusting nut; 11- handle rocker arm; 12- sleeve; 13- latch;
[0033] 20-mid-mounted PTO housing; 21-shift fork; 22-shift fork shaft; 23-self-locking groove; 24-spring; 25-steel ball. DETAILED DESCRIPTION
[0034] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.
[0035] This utility model refers to Figure 1-3 .
[0036] Embodiment 1:
[0037] The utility model provides a mid-mounted PTO operating mechanism, comprising a bracket 1, a pull wire 3, and a mid-mounted PTO shell 20, wherein an operating handle 2 is hinged on the bracket 1, a shift shaft 5 is provided on the mid-mounted PTO shell 20, a shift head 6 is provided on the shift shaft 5, one end of the shift shaft 5 extends out of the mid-mounted PTO shell 20 and is provided with a shift rocker arm 4; one end of the outer shell of the pull wire 3 is connected to the bracket 1, and the other end of the outer shell of the pull wire 3 is connected to the mid-mounted PTO shell 20, one end of the wire core of the pull wire 3 is connected to the operating handle 2, and the other end of the wire core of the pull wire 3 is connected to the free end of the shift rocker arm 4.
[0038] principle:
[0039] The mid-mounted PTO housing 20 is the housing of the mid-mounted PTO transmission box of agricultural machinery such as tractors, and the output shaft of the mid-mounted PTO transmission box is the mid-mounted PTO output shaft, which belongs to the prior art. Figure 2 As shown, a shift fork shaft 22 is provided in the central PTO housing 20, and a shift fork 21 is provided on the shift fork shaft 22. The rotation of the shift shaft 5 can drive the shift rocker arm 4 to swing, and the swing of the shift rocker arm 4 can shift the shift fork 21 to move on the shift fork shaft 22, and the shift fork 21 can shift the meshing gear sleeve to move, thereby realizing the clutch or shifting of the central PTO. As a control mechanism, the purpose is to control the movement of the shift fork 21, which is independent of the structures such as the shift fork shaft 22 and the meshing gear sleeve. During installation, the bracket 1 can be fixed near the cab of the tractor to facilitate the driver to control the control handle 2.
[0040] When the operating handle 2 is pulled, the operating handle 2 pulls the core of the pull wire 3, and the core of the pull wire 3 pulls the shift shaft 5 to swing, and the shift shaft 5 drives the shift rocker arm 4 to rotate, and the shift rocker arm 4 drives the shift head 6 to swing, so that the shift head 6 can shift the shift fork 21 to move to achieve gear shifting. The self-locking structure can be set between the shift fork 21 and the shift fork shaft 22 to achieve self-locking of the gear position. A reset coil spring can be set on the shift shaft 5. When the operating handle 2 is released, the elastic force of the reset coil spring drives the shift shaft 5 to reset. The free end of the shift rocker arm 4 and the central PTO housing 20 can also be connected through the two ends of the spring 24, and the shift rocker arm 4 can be pulled to reset by the elastic force of the spring 24.
[0041] By adopting the utility model, the pull wire 3 can be pulled when the operating handle 2 is pulled, and the shift rocker arm 4 is swung by pulling the pull wire 3, the operating force is small, and the operating comfort is improved; when the operating handle 2 moves, the length of the string rotated by the position where the operating handle 2 is connected to the pull wire 3 is the length of the pull wire 3 pulled out, and the length of the pull wire 3 pulled out determines the swing amplitude of the shift rocker arm 4. It can be inferred that the movement component of the operating handle 2 in the horizontal direction can also effectively drive the shift rocker arm 4 to swing, thereby optimizing the space for lever ratio and facilitating the control of the operating force; at the same time, the installation direction restriction of the operating handle 2 is reduced, and the installation flexibility is good.
[0042] Further, such as Figure 1 As shown: a first connecting plate 7 is provided at one end of the outer shell of the pull wire 3, and the first connecting plate 7 is connected to the bracket 1; a second connecting plate 8 is provided at the other end of the outer shell of the pull wire 3, and the second connecting plate 8 is connected to the central PTO housing 20.
[0043] The pull wire 3 and the bracket 1 can be installed separately, which is convenient for installation, and it is easy to disassemble and replace the pull wire 3 and maintain it conveniently.
[0044] Furthermore, both ends of the outer shell of the pull wire 3 are provided with threaded sections 9, and each threaded section 9 is provided with two adjusting nuts 10. The two adjusting nuts 10 at one end of the outer shell of the pull wire 3 are clamped on both sides of the first connecting plate 7, and the two adjusting nuts 10 at the other end of the outer shell of the pull wire 3 are clamped on both sides of the second connecting plate 8.
[0045] When adjusting the connection position between the pull wire 3 and the operating handle 2 and the length of the shift rocker arm 4, the position of the first connecting plate 7 and the second connecting plate 8 can be changed by adjusting the position of the nut 10 through the knob, thereby changing the protruding length of the outer shell at both ends of the pull wire 3, which can adapt to changes in the installation distance and has good flexibility.
[0046] Furthermore, the first connecting plate 7 is connected to the bracket 1 by bolts, and the second connecting plate 8 is connected to the central PTO housing 20 by bolts.
[0047] Easy to disassemble and assemble.
[0048] Furthermore, the operating handle 2 is also provided with a handle rocker arm 11 , and one end of the handle rocker arm 11 is fixed to the hinge shaft between the operating handle 2 and the bracket 1 .
[0049] The handle rocker arm 11 provides an installation position for the pull wire 3, so that the extension direction of the operating handle 2 can be flexibly arranged, which has good flexibility and convenient operation.
[0050] Furthermore, the bracket 1 is L-shaped, one end of the bracket 1 extends horizontally, the other end of the bracket 1 extends downward, the operating handle 2 is hinged to the middle of the bracket 1, and one end of the outer shell of the pull wire 3 is connected to the lower end of the bracket 1.
[0051] The bracket 1 can cover the exposed part of the wire core of the pull wire 3, so as to protect the pull wire 3 and improve safety; the lower end of the bracket 1 can be fixed on the floor of the cab of the tractor, the exposed part of the pull wire 3 is small, and the structure is compact.
[0052] Further, such as Figure 2 As shown: the shift rocker arm 4 is provided with a sleeve 12 and a latch 13 , the sleeve 12 is sleeved on the shift shaft 5 , and the latch 13 passes through the sleeve 12 and the shift shaft 5 .
[0053] The shift rocker arm 4 is connected to the shift shaft 5 through a sleeve 12 and a latch pin 13, and is easy to install. The shift rocker arm 4 is detachable, so that the shift rocker arm 4 of different lengths can be replaced according to needs, and the operating lever ratio can be adjusted conveniently.
[0054] Furthermore, a fork shaft 22 is provided in the central PTO housing 20 , a fork 21 capable of moving along its own axial direction is provided on the fork shaft 22 , and a self-locking structure is provided between the fork 21 and the fork shaft 22 .
[0055] The self-locking structure can realize self-locking of the gear position, which is convenient for operation; when pulling the operating handle 2, it is only necessary to overcome the self-locking structure, so the operating force is small and the operating comfort is good.
[0056] Further, such as Figure 3 As shown: the self-locking structure includes a self-locking groove 23 provided on the fork shaft 22 and a self-locking channel provided in the fork 21. The self-locking channel is open at one end opposite to the fork shaft 22. A spring 24 and a steel ball 25 are sequentially provided in the self-locking channel from the closed end to the open end. When the self-locking channel of the fork 21 moves to the position of the self-locking groove 23, the spring 24 can press the steel ball 25 into the self-locking channel through its own elastic force.
[0057] When operating the operating handle 2, it is only necessary to overcome the elastic force of the spring 24 when leaving the gear position. There is no resistance at other times and the operating force is small. When entering the gear position, the steel ball 25 is automatically locked into the groove, and the operating resistance is suddenly generated, so it is easy to identify the gear position and stop the operation, and the comfort is good.
[0058] Embodiment 2:
[0059] The utility model also provides a tractor with a mid-mounted PTO, comprising a vehicle body, on which the mid-mounted PTO operating mechanism is installed.
[0060] The central PTO housing 20 of the central PTO operating mechanism is the housing of the central PTO transmission box of the tractor, has a small operating force, and improves the operating comfort; and has a large space for optimizing the lever ratio, which is convenient for controlling the operating force.
[0061] In the description of the present invention, it should be understood that if there are descriptive terms indicating orientation, direction or positional relationship, such as: "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated in this specification is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of understanding the present invention and simplifying the description, and does not indicate or imply that the referred part, element or whole must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0062] In addition, if there are order description terms, such as "first", "second", etc., their purpose in this specification is to facilitate understanding or simplify description. For example, in order to distinguish multiple technical features of the same type or function, but they have to be mentioned separately, this specification may use prefix or suffix order description terms to distinguish them. Therefore, it cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0063] In the present utility model, if the terms describing the relative functional relationship of the structures are used, such as "install", "connect", "connect", "fix", etc., they should be understood in a broad sense unless otherwise clearly specified and limited. For example, "install", "connect", "connect", etc. can be a fixed connection, a detachable connection, or an integrated one; can be a mechanical connection or an electrical connection; can be a direct connection or an indirect connection through an intermediate medium, can be the internal connection of two elements or the interaction relationship between two elements; "fix" can be an integrated fixation or a detachable fixation through fasteners; can be a direct fixation or a fixation through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above-mentioned descriptive terms in the present utility model can be understood according to the specific circumstances, the context, the coherence of the context, etc.
[0064] In the present invention, if there are descriptive terms with subsidiary or connecting meanings, for example, the first feature is "on" or "below" the second feature, unless otherwise clearly specified and limited, it should not be interpreted in a restrictive manner. For example, "on" or "below" can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above descriptive terms in the present invention can be understood according to the specific circumstances, the context, the coherence of the context, etc.
[0065] Furthermore, the first feature being “above”, “above”, and “above” the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being “below”, “below”, and “below” the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0066] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine the different embodiments, examples and features of the different embodiments and examples described in this specification without contradiction, and these combinations or combinations shall all fall within the scope summarized by the utility model.
[0067] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are illustrative and cannot be construed as limitations on the present invention. A person skilled in the art can change, modify, replace and modify the above embodiments within the scope of information available from public channels and in combination with the technical inspiration provided by the present application documents.
Claims
1. A mid-mounted PTO control mechanism, characterized in that: The invention comprises a bracket (1), a pull wire (3), and a central PTO housing (20); the bracket (1) is hingedly connected with an operating handle (2); the central PTO housing (20) is provided with a shifting shaft (5); the shifting shaft (5) is provided with a shifting head (6); one end of the shifting shaft (5) extends out of the central PTO housing (20) and is provided with a shifting rocker arm (4); one end of the outer shell of the pull wire (3) is connected to the bracket (1), the other end of the outer shell of the pull wire (3) is connected to the central PTO housing, one end of the wire core of the pull wire (3) is connected to the operating handle (2), and the other end of the wire core of the pull wire (3) is connected to the free end of the shifting rocker arm (4).
2. The mid-mounted PTO operating mechanism according to claim 1, characterized in that: A first connecting plate (7) is provided at one end of the outer shell of the pull wire (3), and the first connecting plate (7) is connected to the bracket (1); a second connecting plate (8) is provided at the other end of the outer shell of the pull wire (3), and the second connecting plate (8) is connected to the central PTO housing.
3. The mid-mounted PTO operating mechanism according to claim 2, characterized in that: Both ends of the outer shell of the pull wire (3) are provided with threaded sections (9), and each threaded section (9) is provided with two adjusting nuts (10). The two adjusting nuts (10) at one end of the outer shell of the pull wire (3) are clamped on both sides of the first connecting plate (7), and the two adjusting nuts (10) at the other end of the outer shell of the pull wire (3) are clamped on both sides of the second connecting plate (8).
4. The mid-mounted PTO operating mechanism according to claim 2, characterized in that: The first connecting plate (7) is connected to the bracket (1) via bolts, and the second connecting plate (8) is connected to the central PTO housing via bolts.
5. The mid-mounted PTO operating mechanism according to claim 1, characterized in that: The operating handle (2) is also provided with a handle rocker arm (11), and one end of the handle rocker arm (11) is fixed to a hinge shaft between the operating handle (2) and the bracket (1).
6. The mid-mounted PTO operating mechanism according to claim 1, characterized in that: The bracket (1) is L-shaped, one end of the bracket (1) extends horizontally, the other end of the bracket (1) extends downward, the operating handle (2) is hinged to the middle of the bracket (1), and one end of the outer shell of the pull wire (3) is connected to the lower end of the bracket (1).
7. The mid-mounted PTO operating mechanism according to claim 1, characterized in that: The shift rocker arm (4) is provided with a sleeve (12) and a latch (13); the sleeve (12) is sleeved on the shift shaft (5); and the latch (13) penetrates the sleeve (12) and the shift shaft (5).
8. The mid-mounted PTO operating mechanism according to claim 1, characterized in that: A shift fork shaft (22) is arranged in the central PTO housing (20), a shift fork (21) capable of moving along its own axial direction is arranged on the shift fork shaft (22), and a self-locking structure is arranged between the shift fork (21) and the shift fork shaft (22).
9. The mid-mounted PTO operating mechanism according to claim 8, characterized in that: The self-locking structure comprises a self-locking groove (23) provided on the fork shaft (22) and a self-locking channel provided in the fork (21); the self-locking channel is open at one end directly opposite to the fork shaft (22); a spring (24) and a steel ball (25) are sequentially provided in the self-locking channel from the closed end to the open end; when the self-locking channel of the fork (21) moves to the position of the self-locking groove (23), the spring (24) can press the steel ball (25) into the self-locking channel by its own elastic force.
10. A tractor with a mid-mounted PTO, comprising a vehicle body, characterized in that: A mid-mounted PTO operating mechanism according to any one of claims 1 to 9 is installed on the vehicle machine body.