Tractor parking brake system and tractor

Abstract

The present invention relates to a tractor parking brake system and a tractor, wherein a tractor parking brake system comprises a parking handle and a pull rod mechanism, a parking brake synchronous adjustment mechanism, a left parking rocker arm, a connecting rod and a right parking rocker arm, wherein the parking brake synchronous adjustment mechanism comprises a rotating hub and a sleeve, wherein the rotating hub is coaxially sleeved on one end of the connecting rod and can be detachably connected to the connecting rod, and the middle part and / or one end thereof is rotatably connected to the parking handle and the pull rod mechanism, wherein the sleeve is coaxially rotatably sleeved outside the connecting rod and can move along the axial direction of the connecting rod, and at the same time, one end thereof is connected to the other end of the rotating hub, one end of the left parking rocker arm is fixedly connected to the sleeve, and one end of the right parking rocker arm is connected to the other end of the connecting rod. The technical solution of the present invention can improve the technical problem that the existing parking brake pull rod occupies a large space and is not suitable for tractors with narrow adjustment space.

Description

Technical Field

[0001] The present invention relates to the technical field of tractors, in particular to a tractor parking brake system and a tractor. Background Art

[0002] At present, the parking brake adjustment of tractors requires adjusting the parking brake rocker arms on both sides by adjusting sleeves or threaded adjustment parts, so that the parking brake rocker arms on both sides can act on the corresponding brakes at the same time, thereby achieving the purpose of parking. For this adjustment method, it is necessary to use a wrench-like tool to rotate the nut to shrink or extend the brake rod, so that the parking brake rocker arms on both sides can act on the brakes at the same time to achieve the parking effect. The brake rod occupies a large space and requires tools to adjust the nut, which is inconvenient to adjust. Summary of the invention

[0003] Aiming at the technical problem that the existing parking brake pull rod occupies a large space and is not suitable for adjusting a tractor with a narrow space, the present invention provides a tractor parking brake system and a tractor.

[0004] The technical solution of the present invention to solve the above technical problems is as follows:

[0005] The present invention provides a parking brake system for a tractor, comprising a parking handle and a pull rod mechanism, a parking brake synchronous adjustment mechanism, a left parking rocker arm, a connecting rod and a right parking rocker arm. The parking brake synchronous adjustment mechanism comprises a rotating hub and a sleeve. The rotating hub is coaxially sleeved on one end of the connecting rod and is detachably connected to the connecting rod, and the middle part and / or one end thereof is rotatably connected to the parking handle and the pull rod mechanism. The sleeve is coaxially rotatably sleeved outside the connecting rod and can move along the axial direction of the connecting rod, and one end of the sleeve is connected to the other end of the rotating hub. One end of the left parking rocker arm is fixedly connected to the sleeve, and one end of the right parking rocker arm is connected to the other end of the connecting rod.

[0006] The beneficial effects of the present invention are as follows: during debugging, force is applied to the sleeve to separate it from the rotating hub and move it along the axial direction of the connecting rod. The moving sleeve drives the left parking rocker arm to move. Then, force is applied to the sleeve to rotate it relative to the connecting rod to drive the left parking rocker arm to rotate, so that the distance between the right parking rocker arm and the right brake roller is the same or close to the distance between the left parking rocker arm and the left brake roller. The adjustment is completed within the axial space of the connecting rod, thereby improving the technical problem that the existing parking brake pull rod occupies a large space and is not suitable for adjusting tractors with narrow space.

[0007] Based on the above technical solution, the present invention can also be improved as follows.

[0008] Furthermore, an external spline is fixed on the outer side of the other end of the rotating hub, and an internal spline matching with the external spline is fixed on the inner side of one end of the sleeve.

[0009] The beneficial effect of adopting the above further scheme is that during installation, the external spline is engaged with the internal spline to achieve relative static installation of the hub and the sleeve, preventing the hub and the sleeve from moving relative to each other during use, thereby always maintaining the distance between the left parking rocker arm and the left brake roller.

[0010] Furthermore, a force ring is fixed to the connecting rod; the parking brake synchronous adjustment mechanism also includes a return elastic member sleeved on the connecting rod, one end of the return elastic member abuts against the sleeve, and the other end abuts against the force ring.

[0011] The beneficial effect of adopting the above further scheme is: when force is applied to the sleeve to separate it from the rotating hub, the return elastic part is subjected to force and compressed, and when the sleeve is rotated and released, the return elastic part returns to its original state and resets the sleeve and reconnects with the rotating hub; during use, under the continuous pressure of the return elastic part, the sleeve can be prevented from separating from the rotating hub, thereby maintaining the position of the left parking rocker arm.

[0012] Furthermore, the parking brake synchronous adjustment mechanism also includes a top sleeve coaxially sleeved on the connecting rod, one end of the top sleeve extends into the inner side of the other end of the sleeve and is fixedly connected to the sleeve, and the opening size of the other end of the sleeve is larger than the opening size of one end thereof, and one end of the return elastic member abuts against the other end of the top sleeve.

[0013] The beneficial effects of adopting the above further scheme are: the opening size of the other end of the sleeve is larger than the opening size of one end thereof, so as to facilitate the processing of the internal spline; and the sleeve and the top sleeve are fixedly connected, so that when the sleeve is forced to move, the top sleeve can move synchronously.

[0014] Furthermore, a limiting groove is provided at the other end of the sleeve, and one end of the return elastic member extends into and abuts against the limiting groove.

[0015] The beneficial effect of adopting the above further solution is that the return elastic member is limited by the limiting groove to prevent it from moving relative to the sleeve in the axial direction.

[0016] Furthermore, a left limit platform close to the external spline is fixed to the outer side of the rotating hub, and one end of the sleeve is in contact with or separated from the left limit platform.

[0017] The beneficial effect of adopting the above further solution is: the sleeve slidably mounted on the rotating hub is limited by the left limiting platform to prevent the rotating hub and the sleeve from being misaligned.

[0018] Furthermore, the parking brake synchronous adjustment mechanism also includes a lever with one end fixedly connected to the sleeve.

[0019] The beneficial effect of adopting the above further solution is that the sleeve can be quickly rotated by holding the lever, so as to achieve the purpose of quickly and accurately adjusting the position of the left parking rocker arm.

[0020] Furthermore, a pin is inserted into one end of the rotating hub and one end of the connecting rod simultaneously along the radial direction.

[0021] The beneficial effect of adopting the above-mentioned further scheme is: the coaxial fixation of the hub and the connecting rod can be achieved by inserting the pin rod in the radial direction at the same time, and then when the parking brake is performed through the parking handle and the pull rod mechanism, the braking force can be transmitted to the connecting rod through the transmission of the pin rod, and thus transmitted to the left parking rocker arm and the right parking rocker arm at the same time.

[0022] Furthermore, the parking brake synchronous adjustment mechanism also includes a rocker arm with one end fixedly connected to the outer side of the rotating hub, and the other end of the rocker arm is rotatably connected to the parking handle and the pull rod mechanism.

[0023] The beneficial effect of adopting the above further solution is that the parking brake force of the parking handle and the pull rod mechanism is quickly transmitted to the rotating hub through the connection of the rocker arm.

[0024] The present invention also provides a tractor, comprising the tractor parking brake system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a structural diagram of the present invention, which includes a service brake system and a parking brake system;

[0026] Figure 2 for Figure 1 A partial enlarged view of

[0027] Figure 3 for Figure 2 Another perspective structure diagram;

[0028] Figure 4 for Figure 3 A partial enlarged view of

[0029] Figure 5 It is a partial structural cross-sectional view of the present invention;

[0030] Figure 6 It is an exploded view of the local structure of the present invention;

[0031] Figure 7 It is a partial structural diagram of a parking brake system of related technology.

[0032] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0033] 1. Parking handle and pull rod mechanism; 11. Nut; 12. Brake pull rod;

[0034] 2. Parking brake synchronous adjustment mechanism; 21. Rotating hub; 211. External spline; 212. Left limit platform; 22. Sleeve; 221. Internal spline; 23. Return elastic member; 24. Top sleeve; 241. Limit groove; 242. Right limit platform; 25. Push rod; 26. Pin rod; 27. Rocker arm;

[0035] 3. Left parking rocker arm;

[0036] 4. Connecting rod; 41. Force ring;

[0037] 5. Right parking rocker arm;

[0038] 6. Service brake pedal and pull rod mechanism;

[0039] 7. Transfer shaft;

[0040] 8. Left brake assembly; 81. Left driving brake rod; 82. Left end shaft; 83. Left pull arm; 84. Left brake; 85. Left brake roller;

[0041] 9. Right brake assembly; 91. Right service brake rod; 92. Right end shaft; 93. Right pull arm; 94. Right brake; 95. Right brake roller. DETAILED DESCRIPTION

[0042] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0043] like Figure 1 , Figure 2 as well as Figure 7 In the prior art, a tractor braking system generally includes a service braking system and a parking braking system. The service braking system is used to brake the tractor during driving, and the parking braking system is used to park the tractor.

[0044] Among them, the service brake system includes a service brake pedal and pull rod mechanism 6, a central shaft 7 connected to the service brake pedal and pull rod mechanism 6, a left brake assembly 8 and a right brake assembly 9; the left brake assembly 8 includes a left service brake rod 81 rotatably connected to the left end of the central shaft 7 at one end, a left pull arm 83 rotatably connected to the other end of the left service brake rod 81 through a left end rotating shaft 82, a left brake 84 connected to the left pull arm 83, and a left brake roller 85 coaxially fixedly connected to one end of the left end rotating shaft 82; the right brake assembly 9 includes a right service brake rod 91 rotatably connected to the right end of the central shaft 7 at one end, a right pull arm 93 rotatably connected to the other end of the right service brake rod 91 through a right end rotating shaft 92, a right brake 94 connected to the right pull arm 93, and a right brake roller 95 coaxially fixedly connected to one end of the right end rotating shaft 92.

[0045] When debugging the service brake system, when the brake pedal is applied downward, the service brake pedal and the pull rod mechanism 6 are lifted, and the corresponding transfer shaft 7 below the service brake pedal and the pull rod mechanism 6 is pressed. Figure 1 The left and right parking rocker arms 3 and 5 corresponding to the left and right brakes 84 and 94 are respectively pressed. Figure 1 By adjusting the service brake pedal and the pull rod mechanism 6, the left brake 84 and the right brake 94 can achieve the same braking effect. At this time, the left brake roller 85 and the right brake roller 95 may not be in the same front and rear position relative to the front and rear of the tractor.

[0046] Regarding the problem that the left brake roller 85 and the right brake roller 95 may not be in the same front-to-back position relative to the front and rear of the tractor, in the prior art, the left and right parking brake rocker arms (i.e., the left parking brake rocker arm 3 and the right parking brake rocker arm 5) are adjusted by adjusting sleeves or threaded adjustment parts, so that the left and right parking brake rocker arms can act on the corresponding brakes (left brake 84, right brake 94) at the same time, thereby achieving the purpose of parking. For this adjustment method, a wrench-like tool is required to rotate the nut 11 so that the brake rod 12 (refer to Figure 7 ) contraction or extension, so that the left and right parking brake rocker arms can act on the brakes at the same time, playing a parking role. The brake lever takes up a lot of space and requires tools to adjust the nut, which is inconvenient to adjust.

[0047] In view of the above-mentioned defects in the prior art, the present invention discloses a tractor parking brake system and a tractor, which are described in detail below.

[0048] Example 1

[0049] like Figures 1 to 6The present invention discloses a parking brake system for a tractor, comprising a parking handle and a pull rod mechanism 1, a parking brake synchronous adjustment mechanism 2, a left parking rocker arm 3, a connecting rod 4 and a right parking rocker arm 5. The parking brake synchronous adjustment mechanism 2 comprises a rotating hub 21 and a sleeve 22. The rotating hub 21 is coaxially sleeved on one end of the connecting rod 4 and is detachably connected to the connecting rod 4, and the middle part and / or one end thereof is rotatably connected to the parking handle and the pull rod mechanism 1. The sleeve 22 is coaxially rotatably sleeved outside the connecting rod 4 and can move along the axial direction of the connecting rod 4. At the same time, one end thereof is detachably connected to the other end of the rotating hub 21. One end of the left parking rocker arm 3 is fixedly connected to the sleeve 22, and one end of the right parking rocker arm 5 is connected to the other end of the connecting rod 4.

[0050] The beneficial effects of this embodiment are: during debugging, force is applied to the sleeve 22 to separate it from the rotating hub 21 and move it along the axial direction of the connecting rod 4. The moving sleeve 22 drives the left parking rocker arm 3 to move. Then, force is applied to the sleeve 22 to rotate it relative to the connecting rod 4 to drive the left parking rocker arm 3 to rotate, so that the distance between the right parking rocker arm 5 and the right brake roller is the same or close to the distance between the left parking rocker arm 3 and the left brake roller. The adjustment is completed within the axial space of the connecting rod 4, thereby improving the technical problem that the existing parking brake rod occupies a large space and is not suitable for tractors with narrow adjustment space.

[0051] Based on the above embodiment, the hub 21 is provided with a first through hole along its length direction for the connecting rod 4 to be inserted into; the sleeve 22 is provided with a second through hole along its length direction for the connecting rod 4 to be inserted into.

[0052] Example 2

[0053] like Figure 5 and Figure 6 On the basis of Example 1, an outer spline 211 is fixed to the outer side of the other end of the hub 21 , and an inner spline 221 matching with the outer spline 211 is fixed to the inner side of one end of the sleeve 22 .

[0054] The beneficial effect of adopting the preferred scheme in the above embodiment is that, during installation, the outer spline 211 is engaged with the inner spline 221 to achieve relative static installation of the hub 21 and the sleeve 22, preventing the hub 21 and the sleeve 22 from moving relative to each other during use, thereby always maintaining the distance between the left parking rocker arm 3 and the left brake roller.

[0055] As a parallel solution of the above embodiment, the hub 21 and the sleeve 22 may also be connected by plugging.

[0056] Example 3

[0057] like Figure 5 and Figure 6On the basis of embodiments 1 and 2, a force ring 41 is fixed to the connecting rod 4; the parking brake synchronous adjustment mechanism 2 also includes a return elastic member 23 sleeved on the connecting rod 4, one end of the return elastic member 23 abuts against the sleeve 22, and the other end abuts against the force ring 41.

[0058] The beneficial effect of adopting the preferred scheme in the above embodiment is that when force is applied to the sleeve 22 to separate it from the rotating hub 21, the return elastic member 23 is stressed and compressed, and when the sleeve 22 is rotated and released, the return elastic member 23 returns to its original state and resets the sleeve 22 and reconnects with the rotating hub 21; during use, under the continuous pressure of the return elastic member 23, the sleeve 22 can be prevented from separating from the rotating hub 21, thereby maintaining the position of the left parking rocker arm 3.

[0059] The return elastic member 23 may be a spring.

[0060] Example 4

[0061] like Figure 5 and Figure 6 On the basis of Examples 1-3, the parking brake synchronous adjustment mechanism 2 also includes a top sleeve 24 coaxially sleeved on the connecting rod 4, one end of the top sleeve 24 extends into the inner side of the other end of the sleeve 22 and is fixedly connected to the sleeve 22, and the opening size of the other end of the sleeve 22 is larger than the opening size of one end thereof, and one end of the return elastic member 23 abuts against the other end of the top sleeve 24.

[0062] The beneficial effect of adopting the preferred scheme in the above embodiment is that the opening size of the other end of the sleeve 22 is larger than the opening size of one end thereof, so as to facilitate the processing of the internal spline 221; and the sleeve 22 and the top sleeve 24 are fixedly connected, so that when the sleeve 22 is forced to move, the top sleeve 24 can move synchronously.

[0063] Specifically, the sleeve 22 and the top sleeve 24 may be connected by interference fit, or may be connected by bolt connection, clamping, or the like.

[0064] The top sleeve 24 is provided with a third through hole for facilitating the insertion of the connecting rod 4 .

[0065] Based on the above embodiment, the opening size of the other end of the sleeve 22 is larger than the opening size of one end, that is, the second through hole is a stepped hole, and the opening diameter formed by the internal spline 221 is smaller than the opening diameter of the other end, so that the tool can be inserted and quickly process the internal spline 221.

[0066] Based on the above embodiment, the axial length of the top sleeve 24 is smaller than the depth of the opening at the other end of the sleeve 22, so that after the top sleeve 24 is installed in place, a gap is formed between the top sleeve 24 and the rotating hub 21, and the pressure of the return elastic member 23 applied to the top sleeve 24 will not be directly transmitted to the rotating hub 21, thereby affecting the installation of the rotating hub 21.

[0067] In addition, a right limit platform 242 is fixedly connected to the outside of the other end of the top sleeve 24, and the right limit platform 242 abuts against the other end of the sleeve 22, so that after the top sleeve 24 is installed in place, the right limit platform 242 abuts against the other end of the sleeve 22, so that a gap is formed between the top sleeve 24 and the rotating hub 21.

[0068] As a parallel solution of the above embodiment, the larger opening formed by the sleeve 22 and the top sleeve 24 is a polygonal hole, so that after the top sleeve 24 is inserted, the sleeve 22 and the top sleeve 24 will not rotate relative to each other.

[0069] Example 5

[0070] like Figure 5 and Figure 6 On the basis of embodiments 1-4, a limiting groove 241 is provided at the other end of the sleeve 22 , and one end of the return elastic member 23 extends into and abuts against the limiting groove 241 .

[0071] The beneficial effect of adopting the preferred solution in the above embodiment is that the return elastic member 23 is limited by the limiting groove 241 to prevent it from moving relative to the sleeve 22 in the axial direction.

[0072] Based on the above embodiment, the limiting groove 241 is connected to the third through hole.

[0073] Example 6

[0074] like Figure 5 and Figure 6 On the basis of Embodiments 1-5, a left stopper 212 close to the external spline 211 is fixed to the outer side of the hub 21 , and one end of the sleeve 22 is in contact with or separated from the left stopper 212 .

[0075] The beneficial effect of adopting the preferred solution in the above embodiment is that the sleeve 22 slidably mounted on the rotating hub 21 is limited by the left limiting platform 212 to prevent the rotating hub 21 and the sleeve 22 from being misaligned.

[0076] Example 7

[0077] like Figures 1 to 4 On the basis of embodiments 1-6, the parking brake synchronous adjustment mechanism 2 further includes a lever 25 having one end fixedly connected to the sleeve 22 .

[0078] The beneficial effect of adopting the preferred solution in the above embodiment is that the sleeve 22 can be quickly rotated by holding the lever 25, so as to achieve the purpose of quickly and accurately adjusting the position of the left parking rocker arm 3.

[0079] Example 8

[0080] like Figure 2 and Figure 5 On the basis of Embodiment 1-7, a pin 26 is inserted into one end of the hub 21 and one end of the connecting rod 4 along the radial direction.

[0081] The beneficial effect of adopting the preferred scheme in the above embodiment is that the coaxial fixation of the hub 21 and the connecting rod 4 can be achieved by inserting the pin rod 26 in the radial direction at the same time, and then when the parking brake is performed through the parking handle and the pull rod mechanism 1, the braking force can be transmitted to the connecting rod 4 through the transmission of the pin rod 26, and thus transmitted to the left parking rocker arm 3 and the right parking rocker arm 5 at the same time.

[0082] Based on the above embodiment, a socket is provided at one end of the rotating hub 21 along its radial direction, and a pin hole connected to the socket is provided at one end of the connecting rod 4, so that the pin rod 26 can be inserted into the connected socket and pin hole at the same time, thereby fixing the rotating hub 21 and the connecting rod 4 and preventing relative rotation between the two.

[0083] Example 9

[0084] like Figure 1 and Figure 2 On the basis of embodiments 1-8, the parking brake synchronous adjustment mechanism 2 also includes a rocker arm 27 with one end fixedly connected to the outer side of the rotating hub 21, and the other end of the rocker arm 27 is rotatably connected to the parking handle and the pull rod mechanism 1.

[0085] The beneficial effect of adopting the preferred solution in the above embodiment is that the parking brake force of the parking handle and the pull rod mechanism 1 is quickly transmitted to the rotating hub 21 through the connection of the rocker arm 27 .

[0086] During the specific installation, the sleeve 22 is connected to the left parking rocker arm 3 and the lever 25 by welding, and the top sleeve 24 is pressed into the sleeve 22 by interference, that is, the four parts are a whole. The return elastic member 23 is installed first, and the return elastic member 23 is sleeved on the connecting rod 4, and then the sleeve 22 and the top sleeve 24 after interference pressing are simultaneously sleeved on the connecting rod 4, and the end of the return elastic member 23 extends into the limiting groove 241, and then the rotating hub 21 is installed and fixed and limited by the pin rod 26.

[0087] Example 10

[0088] The present invention also discloses a tractor, such as Figure 1 and Figure 2, including a tractor parking brake system as described in Examples 1-9, and also including a service brake system, the service brake system including a service brake pedal and a pull rod mechanism 6, a central shaft 7 connected to the service brake pedal and the pull rod mechanism 6, a left brake assembly 8 and a right brake assembly 9; the left brake assembly 8 includes a left service brake rod 81 rotatably connected to the left end of the central shaft 7 at one end, a left pull arm 83 rotatably connected to the other end of the left service brake rod 81 through a left end rotating shaft 82, a left brake 84 connected to the left pull arm 83, and a left brake roller 85 coaxially fixedly connected to one end of the left end rotating shaft 82; the right brake assembly 9 includes a right service brake rod 91 rotatably connected to the right end of the central shaft 7 at one end, a right pull arm 93 rotatably connected to the other end of the right service brake rod 91 through a right end rotating shaft 92, a right brake 94 connected to the right pull arm 93, and a right brake roller 95 coaxially fixedly connected to one end of the right end rotating shaft 92.

[0089] The beneficial effect of adopting the preferred solution in the above embodiment is that, when the service brake system is debugged, when the brake pedal is applied downward, the service brake pedal and the pull rod mechanism 6 are lifted, and the corresponding transfer shaft 7 below the service brake pedal and the pull rod mechanism 6 is pressed. Figure 1 The left and right parking rocker arms 3 and 5 corresponding to the left and right brakes 84 and 94 are respectively pressed. Figure 1 Rotate clockwise in the direction of the brake, and the brake pads inside the brake are gradually pressed together until they are tightened, thus achieving braking.

[0090] Then debug the parking brake system. The adjustment method is as follows: hold the lever 25 on the sleeve 22 by hand, move the top sleeve 24 and the sleeve 22 in the direction away from the rotating hub 21 at the same time, and manually compress the return elastic member 23 to the right to disengage the internal spline 221 on the sleeve 22 from the external spline 211 on the rotating hub 21. At this time, the sleeve 22 can be manually rotated so that the distance between the right parking rocker arm 5 and the right brake roller is the same as or close to the distance between the left parking rocker arm 3 and the left brake roller.

[0091] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0092] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. 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 invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0093] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0094] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a 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. A first feature being "below", "below" or "below" a 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.

[0095] 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 present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0096] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A tractor parking brake system, characterized in that: The invention comprises a parking handle and pull rod mechanism (1), a parking brake synchronous adjustment mechanism (2), a left parking rocker arm (3), a connecting rod (4) and a right parking rocker arm (5), wherein the parking brake synchronous adjustment mechanism (2) comprises a rotating hub (21) and a sleeve (22), wherein the rotating hub (21) is coaxially sleeved on one end of the connecting rod (4) and is detachably connected to the connecting rod (4), and wherein the middle part and / or one end thereof is rotatably connected to the parking handle and pull rod mechanism (1), and the sleeve (2 2) a sleeve coaxially rotatably arranged outside the connecting rod (4) and movable along the axial direction of the connecting rod (4), one end of which is connected to the other end of the rotating hub (21), one end of the left parking rocker arm (3) is fixedly connected to the sleeve (22), and one end of the right parking rocker arm (5) is connected to the other end of the connecting rod (4); an external spline (211) is fixed on the outer side of the other end of the rotating hub (21), and a spline (211) is fixed on the inner side of one end of the sleeve (22) The connecting rod (4) is fixed with a force ring (41); the parking brake synchronous adjustment mechanism (2) further comprises a return elastic member (23) sleeved on the connecting rod (4), one end of the return elastic member (23) abuts against the sleeve (22), and the other end abuts against the force ring (41); the parking brake synchronous adjustment mechanism (2) further comprises a top sleeve (24) coaxially sleeved on the connecting rod (4), the top sleeve (24) One end of the sleeve (24) extends into the inner side of the other end of the sleeve (22) and is fixedly connected to the sleeve (22). The opening size of the other end of the sleeve (22) is larger than the opening size of one end thereof. One end of the return elastic member (23) abuts against the other end of the top sleeve (24). The axial length of the top sleeve (24) is smaller than the depth of the opening of the other end of the sleeve (22), so that after the top sleeve (24) is installed in place, a gap is formed between the top sleeve (24) and the rotating hub (21).

2. A tractor parking brake system according to claim 1, characterized in that: The other end of the sleeve (22) is provided with a limiting groove (241), and one end of the return elastic member (23) extends into and abuts against the limiting groove (241).

3. A tractor parking brake system according to claim 1, characterized in that: A left limit platform (212) close to the external spline (211) is fixed on the outer side of the rotating hub (21), and one end of the sleeve (22) is in contact with or separated from the left limit platform (212).

4. A tractor parking brake system according to claim 1, characterized in that: The parking brake synchronous adjustment mechanism (2) also includes a lever (25) with one end fixedly connected to the sleeve (22).

5. A tractor parking brake system according to claim 1, characterized in that: One end of the rotating hub (21) and one end of the connecting rod (4) are both provided with a pin rod (26) inserted in a radial direction.

6. A tractor parking brake system according to any one of claims 1 to 5, characterized in that: The parking brake synchronous adjustment mechanism (2) further comprises a rocker arm (27) having one end fixedly connected to the outside of the rotating hub (21), and the other end of the rocker arm (27) is rotatably connected to the parking handle and the pull rod mechanism (1).

7. A tractor, characterized in that: It comprises a tractor parking brake system as described in any one of claims 1-6.

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