CN212034864U - Riding type mower - Google Patents

Abstract

The utility model discloses a ride type lawn mower, include: a main frame; a mowing element; a walking assembly; the operation assembly is used for a user to operate so as to control the riding mower to walk and output power; the walking subassembly includes first walking wheel and second walking wheel, still includes the drive assembly who is used for driving second walking wheel pivoted, and drive assembly includes: a drive motor; a speed change mechanism connected to the drive motor; the output shaft is connected with the speed change mechanism and the second travelling wheel and can drive the second travelling wheel to rotate; a gearbox for housing the variator and the output shaft; the output shaft is connected with a transmission gear and is connected with a speed change mechanism through the transmission gear; the speed change mechanism also comprises a transmission gear, and an output shaft is connected with the transmission gear; the output shaft is also connected to the gear box through a first connecting assembly, and the first connecting assembly comprises a first bearing distributed along the axial direction of the output shaft and a retainer arranged between the first bearing and the transmission gear. The riding mower has strong environment adaptability.

Description

Riding type mower

Technical Field

The utility model relates to a riding mower.

Background

The mower is widely applied to the fields of lawn trimming, vegetation trimming and the like as a garden tool. The conventional riding lawn mower, as a single-person small-sized construction machine which can be driven, has a special structure determined by its special function in terms of the general properties, and causes a user to experience large fluctuation in the operation process due to the special working environment and the complex working terrain. For the riding lawn mower, on the premise of meeting various performance requirements, functional requirements and safety requirements, how to provide the riding lawn mower which has a simple structure and can effectively relieve the axial force action of an output shaft is a problem to be solved at present.

SUMMERY OF THE UTILITY MODEL

For solving the not enough of prior art, the utility model aims to provide a riding mower that can effectively alleviate the axial force effect of output shaft.

In order to achieve the above object, the utility model adopts the following technical scheme:

a riding lawn mower comprising: a main frame configured to carry a seat; a mowing element configured to cut vegetation; the walking assembly is arranged for the riding mower to walk; the operation assembly is used for a user to operate so as to control the riding mower to walk and output power; the walking subassembly includes first walking wheel and second walking wheel, still includes first drive assembly and the second drive assembly that is used for driving second walking wheel pivoted, and first drive assembly or second drive assembly include: a driving motor for outputting a driving force; a speed change mechanism connected to the drive motor; the output shaft is used for connecting the speed change mechanism and the second travelling wheel and can drive the second travelling wheel to rotate; a gearbox for housing the variator and the output shaft; the speed change mechanism also comprises a transmission gear, and an output shaft is connected with the transmission gear; the output shaft is also connected to the gear box through a first connecting assembly, and the first connecting assembly comprises a first bearing distributed along the axial direction of the output shaft and a retainer arranged between the first bearing and the transmission gear.

Further, the retainer and the first bearing are arranged on the output shaft;

the second bearing is arranged at one end of the output shaft close to the second travelling wheel.

Furthermore, the retainer is a circular ring distributed around the output shaft, and a thrust roller pin is arranged on the circular ring and can freely rotate on the circular ring.

Further, the first connecting assembly further comprises a first gasket and a second gasket, and the first gasket and the second gasket are arranged between the first bearing and the retainer.

Further, when the second gasket is tightly attached to the retainer, the thrust roller pin can rotate relative to the second gasket.

Further, the output shaft is also provided with a protruding part which is arranged between the transmission gear and the second travelling wheel and is close to the transmission gear.

Further, the lobes are distributed around the output shaft, the lobes having a diameter greater than a diameter of the output shaft.

Further, the gear case is formed with an accommodation groove in which the boss is disposed.

Further, the transmission gear further comprises a sleeve arranged on one side of the protruding portion away from the transmission gear.

Further, a third gasket is disposed between the boss and the sleeve.

The utility model discloses an useful part lies in: the retainer used for overcoming the action of the axial force is arranged on the output shaft, so that the compression action of the axial force on each component on the output shaft is effectively reduced, the environment adaptability of the riding mower is improved, and the service life is prolonged.

Drawings

FIG. 1 is a perspective view of a riding lawn mower;

FIG. 2 is a perspective view of another perspective of the riding lawn mower de-grass collection system of FIG. 1;

FIG. 3 is a perspective view of the power unit of the riding mower of FIG. 1 disposed on the main frame;

FIG. 4 is a perspective view of a power supply apparatus of the riding lawn mower of FIG. 1;

FIG. 5 is an exploded view of the connection of the riding mower power unit of FIG. 3 to the main frame;

FIG. 6 is a perspective view of the power supply apparatus of the riding mower of FIG. 4 with the hatch cover open;

FIG. 7 is an enlarged partial view of the riding lawn mower of FIG. 6 at A;

FIG. 8 is an exploded view of the power supply arrangement of the riding mower of FIG. 6;

FIG. 9 is an exploded view from another perspective of the power supply apparatus of the riding lawn mower of FIG. 8;

FIG. 10 is a perspective view of a clasp of the power supply apparatus of the riding lawn mower of FIG. 9;

FIG. 11 is an enlarged partial view of the riding lawn mower of FIG. 9 at B;

FIG. 12 is a cross-sectional view of the power supply apparatus of the riding lawn mower of FIG. 4;

FIG. 13 is an enlarged partial view of the riding lawn mower of FIG. 12 at C;

FIG. 14 is an exploded view of a housing cover of the power supply apparatus of the riding mower of FIG. 8;

FIG. 15 is an exploded view from another perspective of a housing cover of the power supply apparatus of the riding lawn mower of FIG. 14;

FIG. 16 is a perspective view of a main frame linked walking assembly of the riding mower of FIG. 1;

FIG. 17 is a perspective view of a second road wheel of the riding lawn mower of FIG. 16 and a drive assembly provided thereon;

FIG. 18 is a rear elevational view of the second road wheel of the riding lawn mower of FIG. 17 and a drive assembly provided thereon;

FIG. 19 is an enlarged partial view of the riding lawn mower of FIG. 17 at D;

FIG. 20 is a cross-sectional view of a portion of a second road wheel and a drive assembly disposed thereon of the riding mower of FIG. 17;

FIG. 21 is an enlarged partial view of the riding lawn mower of FIG. 20 at E;

FIG. 22 is an exploded schematic view of a portion of the second road wheel of the riding mower of FIG. 17 and a drive assembly provided thereon;

FIG. 23 is a perspective view of a cage of the riding mower of FIG. 22;

FIG. 24 is an enlarged partial view of the riding lawn mower of FIG. 22 at F;

FIG. 25 is an exploded schematic view of the output shaft of the riding mower of FIG. 22;

FIG. 26 is a top view of the riding lawn mower of FIG. 1 with the seat and portions of the housing removed;

FIG. 27 is a perspective view of a main frame mounted control module of the riding mower of FIG. 26;

FIG. 28 is a top view of a main frame mounted control module of the riding mower of FIG. 22;

FIG. 29 is an enlarged partial view of the riding lawn mower of FIG. 28 at G;

FIG. 30 is a perspective view of the main frame of the riding mower of FIG. 26;

FIG. 31 is a front view of a park system of the riding mower of FIG. 1;

FIG. 32 is an internal schematic view of a park system of the riding mower of FIG. 31

Fig. 33 is a front view of a detent system of the riding mower of fig. 1.

Detailed Description

The riding electric machine shown in fig. 1 may be an electric machine for working indoors or outdoors, and in this embodiment, the riding electric machine is specifically exemplified by a riding lawn mower 100, and the riding lawn mower 100 may be operated by a user riding thereon to trim lawn, vegetation, and the like.

It will be appreciated that the riding electric machine may be embodied in other types of tools, such as a riding electric vehicle, such as an all-terrain vehicle, a golf cart, or a riding electric tool that functions by outputting some form of power, such as a riding snowplow, a riding agricultural machine, etc., although it will be appreciated that the riding electric machine may also be embodied in tools for other purposes, such as a riding moped, a riding forklift, etc. Indeed, it is intended that all such additional tools, including the subject matter described below, be included within the scope of the present invention.

For convenience of explanation, the riding mower is taken as an example, and the front side, the rear side, the left side, the right side, the upper side and the lower side shown in fig. 1 are defined.

As shown in fig. 1, the riding lawn mower 100 includes: main frame 11, seat 12, power take-off assembly 13, walking assembly 14, operating assembly 15 and power supply device 16.

The main frame 11 is used for carrying the seat 12, the power output assembly 13, the walking assembly 14, the operating assembly 15 and the power supply device 16, and the main frame 11 extends at least partially along a first straight line 101 parallel to the front-rear direction, and the assemblies and the devices are reasonably distributed on all parts of the main frame.

The power take-off assembly 13 comprises an output for outputting power for a mechanical function, for example, in the present embodiment, the output may be a grass cutting element. The power take-off assembly 13 is also connected to the main frame 11, and in this embodiment, the power take-off assembly 13 may be specifically mounted to the underside of the main frame 11. The power output assembly 13 further includes: a first motor and a chassis. The mowing element is used for achieving a mowing function, the first motor is used for driving the mowing element to rotate at a high speed, and the chassis is provided with a containing space used for containing at least part of the motor and part of the mowing element. The power take-off assembly may include more than one mowing element and, correspondingly, the number of first motors may correspond to the mowing element.

The walking assembly 14 is used to enable the riding lawn mower 100 to walk on the lawn. The walking assembly 14 may specifically include: first and second traveling wheels 141 and 142, the first traveling wheel 141 being disposed in front of the second traveling wheel 142 in the front-rear direction. In the present embodiment, the number of the first travel wheels 141 is 2, and the number of the second travel wheels 142 is also 2. Wherein, along the direction of the first straight line 101, the power output assembly 13 is at least partially arranged between the first traveling wheel 141 and the second traveling wheel 142, and along the direction of the first straight line 101, the seat 12 is also at least partially arranged between the first traveling wheel 141 and the second traveling wheel 142, so that the gravity center of the whole machine is positioned between the first traveling wheel 141 and the second traveling wheel 142 along the direction of the first straight line 101, thereby improving the balance performance of the whole machine. The first traveling wheel 141 may be a universal wheel that can rotate about the first axis 102, and the first traveling wheel 141 has a first diameter. The travel assembly 14 further includes a second motor for driving the second road wheels 142 to rotate about the second axis, the number of the second motors also being 2, such that when the two second motors drive the corresponding second road wheels 142 to rotate at different rotational speeds, a speed difference is generated between the two second road wheels 142, thereby steering the riding mower 100. The second road wheel 142 has a second diameter, the second diameter of the second road wheel 142 being greater than the first diameter of the first road wheel 141.

The operating assembly 15 is operable by a user to control the riding mower 100 to walk and output power. The operating assembly 15 may include: a first operating element 151 and a second operating element 152. The first operating element 151 is used for manual operation by a user to activate the motor to control the mowing element to mow and the riding mower 100 to walk on a lawn, and the second operating element 152 is used for stepping by the user to control the running state of the mower.

As shown in fig. 2 to 3, the power supply device 16 is used to supply power to the power take-off assembly 13 and the walking assembly 14. The power supply device 16 is provided on the main frame 11 and detachable from the main frame 11. Specifically, the power supply device 16 is disposed behind the main frame 11, and the power supply device 16 cooperates with other components disposed at the front and middle portions of the main frame 11 to make the center of gravity of the entire riding mower 100 located between the first road wheels 141 and the second road wheels 142 in the direction of the first straight line 101, so that the center of gravity of the riding mower 100 is more stable, and the riding mower 100 does not topple over when passing through a steep ascending slope or a steep descending slope.

As shown in fig. 4 to 5, the power supply device 16 is connected to the main frame 11 through a set of support bases 17. The support base 17 includes a support portion 171 for supporting the power supply unit 16, and also includes a first connecting portion 172 and a second connecting portion 173. The first connecting portion 172 is used for connecting the power supply device 16, and the second connecting portion 173 is used for connecting to the main frame 11. The first connection portion 172 is connected to the bottom end of the power supply device 16 through a connection member; the second connecting portion 173 is connected to the main frame 11 by a connector. Optionally, a connecting mechanism 111 is further disposed on the main frame 11, and the connecting mechanism 111 is disposed on the main frame 11 as an intermediate component, which can protect the structural strength of the main frame 11 and can ensure the stability of the bracket connection between the power supply device 16 and the main frame 11. It is understood that the main frame 11 may not be provided with a connecting structure, and the main frame 11 may be directly connected to the second connecting portion 173. As an alternative implementation manner, the connecting members may be screws, and the first connecting portion 172 and the second connecting portion 173 may be provided as screw holes. It is to be understood that the first connecting portion 172 and the second connecting portion 173 are not limited to the above-described setting, as long as the power supply device 16 can be detachably connected to the main frame 11, and a stable connection relationship can be ensured.

When the riding mower runs and passes through complex road conditions, large vibration can be generated, and when the vibration is transmitted to the main frame 11, the main frame 11 further transmits the vibration to the connecting sheet of the battery pack 161, poor contact between the battery pack 161 and the connecting sheet of the battery pack 161 is easy to cause, and the hidden danger of poor ignition is generated. In order to avoid the presence of undesirable sparking, the power supply unit 16 itself is provided with a certain damping function which substantially absorbs vibrations from the main frame 11. In order to make the power supply unit 16 capable of accommodating severe vibration, a buffer 112 is further provided at the joint of the support base 17 and the main frame 11. The buffer member 112 can greatly reduce the relative movement between the power supply device 16 and the support base 17. Specifically, the buffer 112 is disposed between the second connecting portion 173 and the main frame 11, and can effectively absorb the shock from the main frame 11 and prevent the shock from the main frame 11 from being transmitted to the power supply device 16. As other alternative implementations, the buffer 112 can be disposed at any connecting position between the power supply device 16 and the main frame 11, as long as the shock from the main frame 11 can be absorbed and prevented from being transmitted to the battery pack 161. The buffer 112 may be, without limitation, an elastic element 1675, a rubber element, or other components with a buffering function. When the buffer member 112 is provided, the buffering function required for the power supply device 16 itself will be greatly impaired, and by such an arrangement, the structure of the power supply device 16 can be simplified, and the assembly requirement thereof will be reduced.

As shown in fig. 6 to 7, the power supply device 16 includes a battery pack 161 and a battery compartment 162, and the battery compartment 162 is formed with an accommodating space for accommodating the battery pack 161. Battery compartment 162 includes a main compartment 163 and a compartment cover 164. The main compartment 163 forms a receiving space for receiving the battery pack 161, and the compartment cover 164 is rotatably connected to the main compartment 163 and can at least partially close the main compartment 163. Specifically, the cap 164 and the main chamber 163 include a first connector 165 and a second connector 166. Wherein the first connector 165 is provided at the end of the bin cover 164 and the main bin 163, and the bin cover 164 can rotate about the first connector 165. The second connector 166 includes a first connection end 166a and a second connection end 166b, the first connection end 166a is disposed at the middle portion of the bin cover 164, and the second connection end 166b is disposed at an end of the main bin 163 adjacent to the first connector 165. A gas spring 166c is disposed between the first and second coupling ends 166a, 166b, and the gas spring 166c is rotatable about the first and second coupling ends 166a, 166 b. The gas spring 166c is pre-charged with gas, and when the cover 164 is lifted to a predetermined angle, the gas spring 166c outputs a pushing force to support the cover 164 to automatically rotate around the first connecting member 165 to a fully opened state, and at this time, the battery pack 161 can be detached or installed. When the lower cover 164 is closed to a predetermined angle, the gas spring 166c outputs a pushing force to automatically rotate the lower cover 164 to be completely closed about the first connecting member 165. In fact, the second connecting member 166 has a dead point of thrust force that cannot be output, and the gas spring 166c automatically outputs a thrust force by manually pushing the cap 164 across the dead point when the user opens or closes the cap 164.

As shown in fig. 8 to 13, as one implementation, the bin cover 164 is further provided with a buckle 167 for locking the bin cover 164 to the main bin 163. Specifically, the catch 167 includes an operating portion 1671, a pivoting portion 1672, and a locking portion 1673. Wherein, an operating part 1671 is provided between the pivot part 1672 and the locking part 1673 and is operable by a user to open or close the bin cover 164; pivot 1672 is used to connect the catch 167 to the lid 164 and can allow the catch 167 to rotate about the pivot 1672; the locking portion 1673 is used to lock the bin cover 164 to the main bin 163. Specifically, the bin cover 164 is provided with a receiving groove 1641, and the receiving groove 1641 is used for receiving at least a portion of the pivot portion 1672, and allowing the pivot portion 1672 to rotate in the receiving groove 1641. Pivot portion 1672 is secured to receiving slot 1641 by a set of attachment assemblies 1674. Specifically, the connection assembly 1674 includes a pair of screws and a connecting piece, the screws are used to fix the connecting piece to the bin cover 164 and can limit the pivot portion 1672 from sliding out of the receiving groove 1641 when the pivot portion 1672 is mounted to the receiving groove 1641. The locking portion 1673 is a locking hook extending from the body of the buckle 167. The main chamber 163 further has a through hole 1631 through which the locking portion 1673 passes and a stopper 1632 that can be engaged with the locking hook. Specifically, the locking portion 1673 includes an inner side and an outer side. The inner side edge clings to the limiting part 1632 and comprises a first edge 1673a and a second edge 1673b, and the first edge 1673a and the second edge 1673b are obliquely intersected and form an included angle. First edge 1673a and second edge 1673b include an acute angle α. More specifically, the included angle α is 60 ° or more and 85 ° or less. As a preferred implementation, the locking portion 1673 is locked when the included angle α between the first edge 1673a and the second edge 1673b is 75 °. The stopper 1632 extends from the through hole 1631, and is formed with a passage through which the locking portion 1673 is stroked and a protrusion for catching the locking portion 1673. In fact, the limiting portion 1632 includes a first face 1632a and a second face 1632 b. When the locking portion 1673 passes through the through hole 1631, the locking portion 1673 has a first position where it is engaged with the stopper portion 1632 and a second position where it is away from the stopper portion 1632. When the locking portion 1673 is in the first position, the locking hook is engaged with the limiting portion 1632 and can hook the limiting portion 1632, at this time, the locking hook slides from the first surface 1632a to the second surface 1632b of the limiting portion 1632, and the locking hook is at least partially retained on the second surface 1632b, so as to lock the bin cover 164 to the main bin 163. When the locking portion 1673 is at the second position, the locking hook is disengaged from the limiting portion 1632, and at this time, the locking hook is disengaged from the second surface 1632b of the limiting portion 1632 to the first surface 1632a and is disengaged from the through hole 1631 of the main chamber 163, and the chamber cover 164 can rotate around the first connecting member 165 to any open position.

As an alternative implementation, an elastic member 1675 is further disposed on the latch 167, and is used to provide an elastic force when the locking portion 1673 is in the second position, so that the locking portion 1673 can be kept in the second position, and thus the cap 164 can be locked to the main chamber 163. Specifically, be formed with a spacing arch 1676 on the buckle 167, elastic component 1675 pot head is established on spacing arch 1676, and the other end sets up in holding groove 1641 of storehouse cover 164. More specifically, the elastic member 1675 is disposed on the end of the latch 167 away from the locking portion 1673, and is capable of cooperating with the locking portion 1673 to form a lever structure, that is, when the elastic member 1675 applies a downward elastic force to the latch 167, the latch 167 takes the position of the through hole 1631 on the main chamber 163 as a fulcrum, so that the locking portion 1673 applies an upward acting force to the limiting portion 1632, and the locking portion 1673 can be locked to the limiting portion 1632.

When the user operates the operation portion 1671, the elastic force of the elastic member 1675 is overcome, so that the locking portion 1673 is disengaged from the limiting portion 1632 and slides from the second surface 1632b to the first surface 1632a, the operation portion 1671 is further operated, so that the latch 167 is disengaged from the through hole 1631 of the main chamber 163, and the second connecting member 166 crosses over the dead point, so that the second connecting member 166 directly drives the cover 164 to automatically rotate to the fully open state. When it is desired to close the lid 164, the user may operate the lid 164 such that the lid 164 crosses the dead center, such that the second connector 166 automatically returns the lid 164 to the closed position. At this time, the locking portion 1673 passes through the through hole 1631 of the main chamber 163 and slides from the first surface 1632a to the second surface 1632b of the limiting portion 1632, and the cap 164 is locked to the limiting portion 1632 of the main chamber 163 by the latch 167 under the action of the elastic member 1675.

As shown in fig. 14, the bin cover 164 includes a first cover body 1642 and a second cover body 1643. The first cover 1642 is disposed at a side close to the main chamber 163, and the second cover 1643 is disposed at a side of the first cover 1642 away from the main chamber 163. The first cover 1642 is provided with a grid structure 1642a, on one hand, the battery pack 161 disposed in the main chamber 163 generates a certain amount of heat during operation, and the grid structure 1642a can effectively dissipate the heat in the main chamber 163. On the other hand, when the riding mower is operated in the sun, the light radiation increases the temperature in the main chamber 163, and the mesh structure 1642a stops most of the light radiation, thereby reducing the temperature rise in the main chamber 163. As an alternative embodiment, the grid structure 1642a is embodied as through holes 1631 disposed on the first cover 1642. In the front-back direction, the first cover 1642 has a body portion 1642b having a "Y" shape, and the body portion 1642b plays a certain supporting role, which can effectively maintain the structural strength of the first cover 1642. The mesh is distributed outside the body portion 1642b and can connect the body portion 1642b and the edge portion of the first cover body 1642. The second cover 1643 fits the shape of the first cover 1642 and at least partially covers the first cover 1642. In fact, the second cover 1643 is a transparent member, which may be made of a transparent material, which on one hand facilitates the user to observe the conditions in the main chamber 163 through the mesh structure 1642a, and on the other hand, the combination with the first cover 1642 can increase the structural strength of the entire cover 164. As an implementation manner, by providing the first cover body 1642 and the second cover body 1643, on one hand, the structural strength of the bin cover 164 can be enhanced, so that the bin cover 164 can better protect the battery pack 161. On the other hand, with this double-layer design, different functions of the bin cover 164 can be divided into different cover bodies, so that the first cover body 1642 and the second cover body 1643 can generate different functions respectively. Further, the combination of different functions between different covers can be realized by the combination of the first cover 1642 and the second cover 1643, and the different functions between different covers do not affect each other.

As shown in fig. 15, a first rib 1642c is further formed on the first cover 1642 on a side close to the main chamber 163, and the first rib 1642c is mainly distributed on the body portion 1642b of the first cover 1642. More specifically, the first rib 1642c is disposed above the main compartment 163, which can effectively enhance the structural strength of the compartment cover 164, so that the battery pack 161 disposed in the main compartment 163 can be effectively protected by the compartment cover 164, and thus, the battery pack is not exposed to the outside and damaged. In addition, through setting up first strengthening rib 1642c, can also effectively reduce the whole weight of canopy 164 for it is lighter when intensity increases. As an implementation manner, a second stiffener 1643a is disposed on the second cover 1643 at a side close to the main chamber 163, and the second stiffener 1643a can increase the strength of the second cover 1643 itself and make the second cover 1643 more portable. When the second cover 1643 and the first cover 1642 are combined, the strength of the two is higher, and the two are lighter.

As shown in fig. 16, the walking assembly 14 specifically includes: first and second traveling wheels 141 and 142, the first traveling wheel 141 being disposed in front of the second traveling wheel 142 in the front-rear direction. The travel assembly 14 also includes a first drive assembly 21 and a second drive assembly 22 for driving rotation of the second travel wheel 142. Thus, when the first drive assembly 21 and the second drive assembly 22 drive the corresponding second road wheels 142 to rotate at different rotational speeds, a speed difference is generated between the two second road wheels 142, so that the riding mower can steer. In particular, the first drive assembly 21 and the second drive assembly 22 are arranged symmetrically with respect to a plane of symmetry extending in the direction of the first line 101.

As shown in fig. 16 to 18, the first drive assembly 21 and the second drive assembly 22 are respectively provided on the main frame 11 through a link. Since the traveling assembly 14 connected to the main frame 11 carries the entire weight from the main frame 11, the second traveling wheels 142 provided on the rear side carry most of the weight from the main frame 11. In addition, the second road wheel 142 is connected to the main frame 11 through the first driving assembly 21 and the second driving assembly 22, so that the load from the main frame 11 is transmitted to the second road wheel 142 through the first driving assembly 21 and the second driving assembly 22. And the first drive assembly 21 and the second drive assembly 22 provided on the main frame 11 as two independent assemblies, which respectively bear loads from the main frame 11, thereby connecting the first drive assembly 21 and the second drive assembly 22 with the main frame 11. As an implementation, a connection plate assembly 23 connecting the first drive assembly 21 and the second drive assembly 22 is also provided. When the link plate assembly 23 is coupled to the first and second driving assemblies 21 and 22, an accommodating space 231 is formed to divide an upper and lower space of at least part of the main frame 11 and to be positioned at a lower side of the main frame 11, and the first and second driving assemblies 21 and 22 are disposed in the accommodating space 231. This effectively divides the upper and lower spaces of the main frame 11, thereby preventing the first and second drive assemblies 21 and 22 from interfering with the related components of the upper space of the main frame 11.

Specifically, the connection plate assembly 23 includes a first connection plate 232 and a second connection plate 233. Wherein the first connecting plate 232 is disposed at an upper side of the first driving assembly 21 and the second driving assembly 22, and the second connecting plate 233 is disposed at a lower side of the first driving assembly 21 and the second driving assembly 22. More specifically, the first and second connection plates 232 and 233 are each connected to the gear boxes 211 of the first and second drive assemblies 21 and 22. As an alternative embodiment, the first connecting plate 232 and the second connecting plate 233 are disposed in parallel in an up-down direction perpendicular to the first straight line 101. Alternatively, the first connecting plates 232 and the second connecting plates 233 may be staggered in a straight direction perpendicular to the first straight line 101. Thereby realizing the division of the upper and lower spaces of the main frame 11 in a large range. By providing the first connecting plate 232 and the second connecting plate 233, the first driving assembly 21 and the second driving assembly 22 can be connected with the main frame 11 to form a whole, so that the rigidity of the connection part of the first driving assembly 21 and the second driving assembly 22 with the main frame 11 can be significantly increased. Meanwhile, because the first driving assembly 21 and the second driving assembly 22 are connected to form a whole, the rigidity of the first driving assembly 21 and the second driving assembly 22 is further enhanced, so that the structural strength of the first driving assembly 21 and the second driving assembly 22 can be obviously increased on the basis of not reinforcing the original first driving assembly 21 and the original second driving assembly 22, and the first driving assembly 21 and the second driving assembly 22 can bear heavier loads. In addition, because the first connecting plate 232 and the second connecting plate 233 are arranged, an accommodating space 231 capable of isolating the upper part and the lower part of the main frame 11 is formed between the first connecting plate 232 and the second connecting plate 233, and the gear box 211 in the first driving assembly 21 and the second driving assembly 22 is at least partially enclosed in the space between the first connecting plate 232 and the second connecting plate 233, so that the gear box 211 is prevented from being damaged by external objects, and the service life of the first driving assembly 21 and the second driving assembly 22 is effectively prolonged. At the same time, the complexity of the work environment to which the riding mower 100 can adapt is also increased. Furthermore, by providing the first connecting plate 232 and the second connecting plate 233, the first driving assembly 21 and the second driving assembly 22 can be well positioned, so that the first driving assembly 21 and the second driving assembly 22 have good coaxiality and can be effectively fixed at a preset position.

As shown in fig. 19, in order to realize effective control of the first driving assembly 21 and the second driving assembly 22, a control circuit (not shown) is further disposed in the first driving assembly 21 and the second driving assembly 22, and the control circuit is connected to the outside through a connection line 212. In the present embodiment, the connection line 212 is disposed to protrude at the rear side of the first and second driving assemblies 21 and 22 and is located in the receiving space 231 between the first and second connection plates 232 and 233. By arranging the connecting line 212 at the rear side of the first driving assembly 21 and the second driving assembly 22 and in the accommodating space 231 between the first connecting plate 232 and the second connecting plate 233, on one hand, the connecting line 212 can be far away from the power output assembly, so as to avoid interference with the power output assembly, and meanwhile, the grass can be prevented from being wound on the connecting line 212 in the working state, so as to further interfere with the connecting line 212. On the other hand, through setting up connecting wire 212 between first connecting plate 232 and second connecting plate 233, can also play the guard action to connecting wire 212, avoid connecting wire 212 to expose and lie in the external world to can make full use of the space of first drive assembly 21 and second drive assembly 22 rear side, make arranging of complete machine more reasonable. Finally, the connection line 212 is provided at the rear side, and also can be easily disassembled for maintenance without disassembling the front end structure.

As shown in fig. 20 to 23, taking the first driving assembly 21 as an example, the first driving assembly 21 includes a driving motor 213, a speed change mechanism 214 and an output shaft 215, wherein the driving motor 213 outputs power to the speed change mechanism 214, and the speed change mechanism 214 transmits the power from the driving motor 213 to the output shaft 215 and drives the output shaft 215 to rotate. The second road wheel 142 is disposed on the output shaft 215 and can rotate synchronously with the output shaft 215. When the riding mower 100 is in operation and the first and second drive assemblies 21 and 22 are used to drive the riding mower 100 to move forward or backward, when the riding mower 100 is steered by the differential speed formed by the first and second drive assemblies 21 and 22 or encounters a slope on the riding mower 100, the second road wheels 142 connected to the output shaft 215 transmit a large axial force to the output shaft 215, and the axial force can press the output shaft 215 to move in the axial direction or cause the second road wheels 142 to generate a force to disengage from the output shaft 215.

In order to avoid that the axial force presses the output shaft 215 and causes the connection of the output shaft 215 and the gear box 211 to wear seriously under the action of the axial force, a first connection assembly 24 is also provided at the connection of the output shaft 215 and the gear box 211. The first connecting assembly 24 specifically includes a first bearing 241, a first gasket 242, a second gasket 243, and a retainer 244, wherein the first bearing 241, the first gasket 242, the second gasket 243, and the retainer 244 are sequentially arranged along the direction of the output shaft 215 and are sleeved on the output shaft 215. The first bearing 241 is for supporting an end of the output shaft 215 away from the second road wheel 142. In fact, a second bearing for supporting the output shaft 215 is also included in the gearbox 211, the second bearing being disposed at an end near the second road wheel 142. The first spacer 242 is disposed between the first bearing 241 and the second spacer 243 for fixing the first bearing 241 and allowing the first bearing 241 to have a predetermined distance from the transmission gear 211a of the output shaft 215. In fact, the transmission gear 211a is provided in the gear case 211 as a part of the speed change mechanism 214. The retainer 244 is disposed between the second spacer 243 and the transmission gear 211a and is used for providing a reaction force opposite to the direction of the axial force, so as to counteract the abrasion of the transmission gear 211a, the first spacer 242, the second spacer 243 and the transmission gear 211a when the axial force is applied to the transmission gear 211a and the first bearing 241, i.e., the first spacer 242 and the second spacer 243. The retainer 244 may be embodied as a thrust bearing or other component capable of providing axial sliding friction. As an alternative embodiment, the cage 244 is an annular ring with thrust roller pins 244 b. As shown in fig. 23, the retainer 244 is a ring 244a disposed around the central axis, and cylindrical needles 244b are disposed around the central axis on both sides of the ring 244 a. In fact, the needle roller 244b is embedded within the cage 244 and is at least partially exposed beyond the surface of the ring 244 a. It can be understood that the roller pin 244b has a smooth and continuous surface, and can freely rotate in the retainer 244, and further can convert static friction between the retainer 244 and the second washer 243 or between the retainer 244 and the transmission gear 211a into sliding friction. In addition, the needle roller 244b protrudes out of the plane where the circular ring 244a of the retainer 244 is located, so that static friction generated when the axial force of the output shaft 215 is applied to the second gasket 243 or the transmission gear 211a can be converted into sliding friction, and the phenomenon that the transmission gear 211a is clamped due to the fact that the second gasket 243 and the retainer 244 are worn out and enter a gap of the transmission gear 211a, and the walking function of the riding type mower 100 is disabled is effectively avoided. Or, the transmission gear 211a is worn out, which affects the service life of the riding mower 100. Further, by providing the retainer 244, the influence of the axial force along the output shaft 215 generated when the riding mower 100 is turned or encounters an inclined road condition can be effectively eliminated, thereby effectively improving the service life of the gear box 211.

As shown in fig. 24 to 25, the output shaft 215 is further formed with a boss 215a, the boss 215a is disposed around the circumference of the output shaft 215, and the diameter of the circumference where the boss 215a of the output shaft 215 is located is larger than the diameter of the other portion of the output shaft 215. As one implementation, a receiving groove 211b for receiving the protrusion 215a is formed in the gear housing 211, and the protrusion 215a is substantially engaged with the receiving groove 211b and is limited within a range of the receiving groove 211 b. Since the output shaft 215 is connected to the gear box 211 at one end and to the second road wheel 142 at the other end. When the output shaft 215 encounters a slope, the output shaft 215 experiences a large axial force due to the second road wheel 142, and the axial force causes the output shaft 215 to have a tendency to move away from the gear box 211. If the axial force is too large, the output shaft 215 is driven by the second road wheel 142 to separate from the gear box 211, so that the whole second road wheel 142 is separated from the main frame 11, and a great safety hazard is caused. At this time, due to the existence of the projection 215a, the majority of the axial force from the second road wheel 142 can be counteracted, so that the output shaft 215 is effectively prevented from being disengaged from the gear box 211. In order to avoid the large friction between the convex part 215a and the gear box 211, a sleeve 211c is further arranged on one side of the convex part 215a far away from the transmission gear 211a, and the sleeve 211c can effectively limit the axial displacement of the output shaft 215. Further, a third gasket 211d is further disposed between the protruding portion 215a of the output shaft 215 and the sleeve 211c, and the third gasket 211d can effectively prevent the protruding portion 215a and the sleeve 211c from being worn under the action of the axial force.

As shown in fig. 1, the riding mower 100 is provided with a first traveling wheel 141, an operation unit, a power output unit, a seat, a second traveling wheel 142, a power supply unit, and a grass catcher 25 in this order from the front side to the rear side. It will be appreciated that the first and second road wheels 141 and 142 are primarily used to support the main frame 11 and other components disposed on the main frame 11 and to provide for the riding mower 100 to travel. The first traveling wheels 141 are arranged at the front end of the main frame 11, the second traveling wheels 142 are arranged at the rear end of the main frame 11, and the operating assembly, the power output assembly and the seat are arranged between the first traveling wheels 141 and the second traveling wheels 142, so that the balance of the whole mower can be effectively kept, the matching of all parts is more balanced, and the riding mower 100 can be operated by a user more conveniently. Wherein, the first operating element in the operating assembly comprises two, set up basically symmetrically on both sides of the main chassis 11. More specifically, the first element operating member is disposed at a middle position distributed in the front-rear direction, and is specifically disposed at both sides of the seat. The second operating element of the operating assembly is disposed at the front side of the main frame 11 and is specifically located at the left side position of the main frame 11, so that the user can control the riding mower 100 by one foot. As one implementation, by disposing the second operating element at the front side of the main frame 11 and at the left side position, a large space can be reserved for the front side of the main frame 11, so that the legs of the user can move freely.

As an alternative embodiment, the power supply device and grass catcher 25 are provided on the rear side of the main frame 11. More specifically, the power supply device is disposed at a rear position near the second traveling wheels 142, and the grass catcher 25 is disposed at an upper side of the power supply device. In the present embodiment, since the plurality of battery packs are provided in the power supply device, it occupies a certain volume and has a certain mass. The power output assembly disposed between the first traveling wheel 141 and the second traveling wheel 142 has a certain volume and mass due to the components such as the cutter head and the driving motor 213, and is disposed at the lower side of the main frame 11. By disposing the power supply unit on the rear side near the second road wheels 142, the power supply unit and the power output assembly are disposed symmetrically about a plane intersecting the extension plane of the main frame 11. Therefore, the balance weight of the riding mower 100 can be effectively adjusted, the weight ratio of the whole machine in the front-back direction and the up-down direction is more balanced, the riding mower 100 is more stable, and the stability and the safety in the operation process can be effectively improved.

Furthermore, the grass catcher 25 is provided on the upper side of the power supply device and extends at least partially toward the rear side of the power supply device, so that the space above and the space behind the power supply device can be effectively utilized. The space of the whole machine is utilized to the maximum extent on the premise of not interfering with other parts of the riding type mower 100. As an implementation manner, the grass-collecting device 25 is connected to the main frame 11 through a set of connecting rods, so that the grass-collecting device 25 can make full use of the three-dimensional space at the upper side and the rear side of the power supply device, and the battery compartment 162 of the power supply device is not contacted with the power supply device and is not squeezed. Meanwhile, the power supply device and the grass collecting device 25 are respectively arranged in different three-dimensional space ranges, so that a user can conveniently adjust or maintain the power supply device or the grass collecting device 25 respectively. In some preferred embodiments, the riding lawn mower 100 includes a grass collection mode and a grass discharge mode. When the riding mower 100 is in the grass collecting mode, the grass collecting device 25 is mounted to the upper side of the power supply device. When the riding mower 100 is in the grass discharge mode, the grass catcher 25 is detached. As an implementation manner, when the riding mower 100 is in the grass discharge mode, a sunshade (not shown) may be further disposed between the seat and the power supply device, and the sunshade is connected between the seat and the power supply device through a connecting rod, so that when a user operates the riding mower 100, the sunshade has better shielding kinetic energy, and at the same time, a gap space between the seat and the power supply device can be better utilized.

As shown in fig. 26-29, the riding lawn mower 100 further includes a control module 31. The control module 31 is disposed at a lower side of the seat and serves as a control center for controlling operations of components electrically connected with the control module 31 and the entire riding mower 100. The main frame 11 extends in a first plane 103, the first line 101 being located in the first plane 103, the main frame 11 being substantially symmetrical about the first line 101. The main frame 11 is also substantially symmetrical about a second straight line 105 in a direction of the second straight line 105 extending in the left-right direction and parallel to the first axis 102. The second straight line 105 is also located in the first plane 103. On a second plane 104 passing through a second line 105 and perpendicular to the first plane 103, the seat is arranged on the main frame 11 and at least partially passes through the second plane 104. The first line 101 and the second line 105 have an intersection 106, and the control module 31 is located substantially within the intersection 106 of the first line 101 and the second line 105. That is, the control module 31 is disposed substantially at the middle of the main frame 11, so that the wiring distance of the connection lines connecting the respective components to the control module 31 can be minimized. Specifically, the control module 31 includes a drive control board 311, a fuse 312, and a power management module 313. The drive control board 311 is used to control the power output unit, the traveling unit 14, and the like. The power take-off assembly is disposed between the first road wheel 141 and the second road wheel 142, and near the intersection 106 of the aforementioned first line 101 and second line 105. By disposing the drive control board 311 for controlling the power output assembly above the power output assembly, the length of the connecting line connecting the drive control board 311 and the power output assembly can be effectively reduced. Through the arrangement, on one hand, the line arrangement can be effectively simplified, the space is fully utilized, and the complexity of the flat cable is reduced; on the other hand, the maintenance can be convenient. It will be appreciated that the location of the fault can be quickly located on a shorter length of connecting line, thereby greatly reducing the time to service and increasing the continuity of the user in operating the riding mower 100.

The fuse 312 is connected between the driving control board 311 and the power management module 313, and the fuse 312 is used to protect the driving circuit, prevent current overload, burn out the circuit or the motor, and the like. Specifically, the fuse 312 is at least partially located at the lower side of the seat and is also located between the driving control board 311 and the power management module 313, thereby facilitating the user's repair or maintenance. Specifically, since the power management module 313 is disposed at the rear side of the main frame 11, and the driving control board 311 is disposed at the lower side of the seat and at least partially located at the intersection 106 of the first straight line 101 and the second straight line 105, disposing the fuse 312 between the power control module 31 and the driving control board 311 can effectively reduce the length of the connecting line connecting the fuse 312 and the power control module 31 and the driving control board 311, thereby further facilitating the user to repair or maintain.

The power management module 313 is arranged at the rear side of the seat and between the seat and the power supply device, and is arranged at the nearest position close to the power supply device, so that the space between the seat and the power supply device can be fully utilized, the length of a connecting wire between the power supply device and the power management module 313 can be effectively reduced, the circuit arrangement of the whole control module 31 is further simplified, and the complexity of assembly and maintenance can be effectively reduced.

The control module 31 further includes a distribution box 314, and the distribution box 314 is used for connecting connection wires from the respective components and is connected to the driving control board 311 by itself. Specifically, the junction box 314 is disposed on the upper side of the driving control board 311, so as to facilitate electrical connection with the driving control board 311 and the power management module 313, and simultaneously, the space on the upper side of the driving control board 311 can be fully utilized. Through the three-dimensional interactive design, on the premise that interference is not generated between the junction box 314 and the drive control panel 311, the space at the lower part of the seat can be effectively utilized, the assembly process is simplified, and the wire arrangement design is optimized, so that great convenience is brought to the use, the maintenance and the like of a user.

As shown in fig. 30, the main frame 11 extends in the front-rear direction, and a projection of the main frame 11 in the up-down direction on a projection plane perpendicular to the up-down direction is substantially rectangular. More specifically, the main frame 11 extends substantially in a plane and is of unitary construction. Through setting up main frame 11 and extending in a plane, can effectual reduction main frame 11's focus, make when installing all kinds of components and parts on main frame 11 simultaneously, the focus of whole machine is in a lower position. In addition, by providing the integrated main frame 11 structure, the structural strength of the main frame 11 can be enhanced while reducing the number of assembling steps. The main frame 11 is also of modular design, so that the main frame 11 can be adapted to the requirements of different platforms.

Specifically, the main frame 11 includes a first link 113, a second link 114, and a third link 115. The first rod 113 and the second rod 114 are disposed in parallel and parallel to the first straight line 101. The third link 115 connects the first link 113 and the second link 114 and is located at the front side of the main frame 11. The first rod member 113, the second rod member 114 and the third rod member 115 are fixedly connected or integrally formed. As an alternative embodiment, the third link 115 is further provided with a coupling hole 115a for coupling the first travel wheel 141. The connection hole 115a is fixedly connected to or integrally formed with the third pin 115. The junction of the third bar 115 with the first bar 113 and the second bar 114 is further provided with a reinforcing portion 115 b. The reinforcing portion 115b may be a right-angled triangle connecting block, which can increase the connecting area between the third bar 115 and the first bar 113 and between the third bar 115 and the second bar 114, so as to enhance the structural strength of the main frame 11. It is understood that the first rod 113, the second rod 114 and the third rod 115 may be fixedly connected or may be integrally formed. A third connecting plate 116 is further disposed between the first rod 113 and the second rod 114. The third connecting plate 116 is disposed at the front side of the main frame 11, and the third connecting plate 116 is parallel to or intersected with the second connecting plate 233, and can be matched with the first connecting plate 232 and the second connecting plate 233, so that the main frame 11 can be more stable, the structural strength of the main frame 11 can be increased, and the main frame 11 can form a stable whole. The third connecting plate 116 extends in a plane and forms a tread portion 116a on which a tread can be stepped. The first link 113 and the second link 114 are also provided at the rear side with an impact beam 117. The bumper bar 117 is circular in cross section, and is arranged so that when the power supply apparatus is mounted to the main frame 11, the bumper bar 117 surrounds the space in which the power supply apparatus is located and is at least partially outside the space in which the power supply apparatus is located. Thus, when a foreign object impacts the riding mower 100, especially the power supply device, the impact bar 117 can effectively avoid the direct impact of the foreign object, and can bear most of kinetic energy, thereby avoiding the power supply device from being damaged when being impacted, and causing certain potential safety hazards.

The main frame 11 is a closed frame structure surrounded by a pipe body with a rectangular cross section. Through setting up the rectangular pipe for each components and parts that are connected to the body have great connection face with main frame 11, thereby make the connection between various components and parts and host computer more firm. Meanwhile, welding of the main frame 11 is facilitated, so that the main frame 11 has a large welding surface, and the overall rigidity of the main frame 11 is guaranteed.

As shown in fig. 31, in the present embodiment, the riding mower 100 further includes a parking system. The parking system 41 includes: a pedal 411, a pedal arm 412, a first rotating member 413, a base plate 414, a ratchet 415, a first elastic member 416, a second elastic member 417, a second rotating member 418 and a third rotating member 419. The pedal 411, the pedal arm 412 and the first rotating member 413 constitute a pedal assembly. In this embodiment, the pedal assembly is the second operating element. The pedal arm 412 includes two running sections, and the riding mower 100 is in the non-parked state when the pedal 411 is depressed so that the pedal arm 412 is located in the first section, and the riding mower 100 is in the parked state when the pedal 411 is depressed so that the pedal arm 412 is located in the second section.

As shown and associated with the detent system 42 of the park system 41. The anti-rotation system 42 is disposed on the right side of the base plate 414. Specifically, the anti-rotation system 42 includes a trigger 421, a contact 422, and an anti-rotation switch 423. The trigger 421 and the first rotating member 413 rotate synchronously. When the trigger 421 rotates to a preset position along with the first rotating member 413, the contact 422 can be triggered, the contact 422 triggers the rotation stop switch 423, and the rotation stop switch 423 controls the second motor to stop rotating, so that the power of the second traveling wheel 142 is cut off, and the second traveling wheel 142 is only braked, so that the brake can be rapidly braked. It should be explained here that the rotation stop switch 423 controls the second motor to stop rotating only in the triggered state, and when the rotation stop switch 423 is not triggered or the triggered rear contact 422 is reset, the rotation stop switch 423 does not control the rotation of the second motor, that is, the rotation stop switch 423 only stops the second motor. A trigger portion 421a is formed or connected to the trigger member 421, and the trigger portion 421a is disposed at a predetermined position. In this embodiment, the trigger 421 has a first section and a second section, wherein the trigger 421a is disposed on the second section. In fact, the entire second section can trigger the contact 422, i.e., the second section can be regarded as the trigger portion 421 a. The trigger member does not trigger the contact member 422 when the trigger member rotates in the first section. In some preferred embodiments, the trigger 421a is provided at a critical position where the riding mower 100 enters the parked state from the non-parked state. In fact, the trigger 421a may be provided before the riding mower 100 enters the parking state, thereby facilitating braking by the user.

Specifically, a slide rail is further formed on the base plate 414, the slide rail penetrates through the base plate 414 along the left-right direction, and the trigger 421 is fixedly connected to the first rotating member 413 through a fastener. The trigger 421 rotates synchronously with the first rotating member 413 within the range of the sliding rail. In some preferred embodiments, the slide rail includes a first slide rail 414a and a second slide rail 414b, and the first slide rail 414a and the second slide rail 414b are located within different rotation radii, which are circular arcs with a center point at which the first central axis 102 passes through the substrate 414 as a center. The first slide rail 414a is closer to the center of the circle than the second slide rail 414b, so the length of the first slide rail 414a is shorter than that of the second slide rail 414 b. By providing two sliding rails, the connection between the triggering member 421 and the first rotating member 413 can be more stable. The triggering member 421 does not move relative to the first rotating member 413 during the rotation of the first rotating member 413.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by adopting equivalent replacement or equivalent transformation fall within the protection scope of the present invention.

Claims (10)

1. A riding lawn mower comprising:

a main frame;

a mowing element configured to cut vegetation;

a walking assembly configured to walk on the riding mower;

an operating assembly for user operation to control the riding mower to walk and power take off;

the walking assembly comprises a first walking wheel and a second walking wheel, and also comprises a first driving assembly and a second driving assembly which are used for driving the second walking wheel to rotate,

it is characterized in that the preparation method is characterized in that,

the first drive assembly or the second drive assembly comprises:

a driving motor for outputting a driving force;

a speed change mechanism connected to the drive motor;

the output shaft is used for connecting the speed change mechanism and the second travelling wheel and can drive the second travelling wheel to rotate;

a gearbox for housing the variator and the output shaft;

the speed change mechanism further comprises a transmission gear, and the output shaft is connected with the transmission gear; the output shaft is further connected to the gearbox through a first connecting assembly, and the first connecting assembly comprises a first bearing distributed along the axial direction of the output shaft and a retainer arranged between the first bearing and the transmission gear.

2. The riding lawn mower of claim 1,

the retainer and the first bearing are arranged on the output shaft;

the output shaft is arranged at one end of the second travelling wheel, and the second bearing is used for fixing the output shaft.

3. The riding lawn mower of claim 1,

the retainer is a circular ring distributed around the output shaft, a thrust roller pin is arranged on the circular ring, and the thrust roller pin can freely rotate on the circular ring.

4. The riding lawn mower of claim 3,

the first connecting assembly further comprises a first gasket and a second gasket, and the first gasket and the second gasket are arranged between the first bearing and the retainer.

5. The riding mower of claim 4, wherein the thrust roller is rotatable relative to the second spacer when the second spacer abuts the cage.

6. The riding lawn mower of claim 1,

the output shaft is further provided with a protruding portion, and the protruding portion is arranged between the transmission gear and the second travelling wheel and close to the transmission gear.

7. The riding lawn mower of claim 6,

the protruding portions are distributed around the output shaft, and the diameter of each protruding portion is larger than that of the output shaft.

8. The riding lawn mower of claim 6,

the gear case is formed with an accommodation groove in which the boss is disposed.

9. The riding lawn mower of claim 6,

the transmission gear is characterized by further comprising a sleeve arranged on one side, far away from the transmission gear, of the protruding portion.

10. The riding lawn mower of claim 9,

further comprising a third gasket disposed between the boss and the sleeve.

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