JP3464724B2 - Cutter housing upper limit position control device for riding turf mower - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a riding turf in which a cutter housing in which a cutter is rotatably stored is supported on a body frame between a front wheel and a rear wheel so as to be able to move up and down. The present invention relates to a device for regulating an upper limit position of a cutter housing in a mower. 2. Description of the Related Art A riding lawn mower often travels on the ground with steps or irregularities, and when traveling on such ground, the cutter housing may be pushed up.
Conventionally, in order to regulate the upper limit position of the cutter housing due to such thrust, conventionally, a substantially L-shaped stopper piece that can abut on the upper surface of the cutter housing is fixed to both sides of the body frame, A rod-shaped stopper that can be contacted is fixed to the upper surface of the cutter housing,
A stopper is provided on a link mechanism provided between a vehicle body frame and a cutter housing. [0003] By the way, such a cutter housing may be pushed upward in a posture inclined to the left or right. In the structure, when the upper limit position is regulated by the stopper, a locally large load may act on the cutter housing. The present invention has been made in view of such circumstances, and even if the cutter housing is tilted to the right or left and pushed up, the load is dispersed by the stopper with which the cutter housing abuts, and the left and right sides of the vehicle body frame are substantially displaced. An object of the present invention is to provide a cutter housing upper limit position restricting device in a riding lawn mower in which a load is applied uniformly and the upper limit position can be restricted. In order to achieve the above object, according to the first aspect of the present invention, a cutter housing in which a cutter is rotatably housed is raised and lowered on a body frame between a front wheel and a rear wheel. In a riding lawn mower that is supported as possible, the body frame includes the steering device
Supports each component from the ring axis to the pitman arm
A stopper having a regulating plate portion which can be brought into contact with the upper surface of the cutter housing and extends substantially in parallel with the entire width of the vehicle body frame is provided on the supporting frame, and a connecting portion between the pitman arm and the tie rod is provided. Below
It is characterized in that it is fixed at a position to cover from . According to the first aspect of the present invention, since the restricting plate portion of the stopper extends horizontally substantially corresponding to the entire width of the vehicle body frame, the cutter housing can be moved right and left. The posture is corrected so that, even if it is pushed up in any direction, when it comes into contact with the regulating plate, it contacts the entire surface of the regulating plate. [0008] Particularly stopper with functions to reinforce the support frame also fulfills the function of protecting the connecting portions of the pitman arm and the tie rod. An embodiment of the present invention applied to a riding lawn mower will be described below with reference to the drawings. FIGS. 1 to 9 show an embodiment of the present invention. FIG. 1 is a side view of a riding lawn mower, FIG. 2 is a plan view of the riding lawn mower, and FIG. -3 line enlarged sectional view,
4 is an enlarged sectional view taken along line 4-4 of FIG. 3, and FIG.
6 is a sectional view taken along line 6-6 of FIG. 5, FIG. 7 is a sectional view taken along line 7-7 of FIG. 5, FIG. 8 is a sectional view taken along line 8-8 of FIG. 5, and FIG. It is a 9-9 line expanded sectional view. [0011] First, in FIGS. 1 and 2, a pair of front wheels W _F is the front portion of the vehicle body frame 11, W _F is steerably suspended. On the other hand, the rear portion of the body frame 11 and the transmission case 12 is fixed, the left of the transmission case 12, the rear wheel at the rear axle housing 13 secured to the right side faces W _R, W _R the shaft rotatably Supported. Thus, the power input to the input shaft 14 protruding from the upper part of the transmission case 12
The transmission is transmitted to both rear wheels W _R , W _R via a speed change mechanism and a differential mechanism (not shown) inside. A vertical engine E is mounted at the front of the body frame 11. A support frame 15 is fixed to the body frame 11 behind the engine E, and a cover 16 having a column portion 16a extending upward to cover the support frame 15 covers the upper portion of the body frame 11 on the rear side. It is attached in such a manner. The passenger seat 1 is attached to the cover 16 at a position spaced rearward from the column portion 16a.
7 is provided. Further, the engine E on the body frame 11 and the fuel tank 19 disposed on the support frame 15
And the like are covered with a hood 18 connected to the vehicle body frame 11 so as to be able to jump forward. Referring also to FIG. 3, power from a crankshaft 20 having a substantially vertical axis and extending downward from engine E is transmitted to input shaft 14 of transmission case 12 via power transmission means 21. Is done. This power transmission means 21
Is a drive pulley 2 fixed to an intermediate portion of the crankshaft 20.
2, a driven pulley 23 fixed to the input shaft 14, and an endless belt 24 for transmitting rear wheel power that is wound around the drive pulley 22 and the driven pulley 23. It is possible to switch between a state where power is transmitted from the shaft 20 to the input shaft 14 and a state where power transmission is cut off by relaxing the tension state of the endless belt 24. [0014] the front wheels W _F, W _F and the rear wheels W _R, W _R
The cutter housing 2 is located below the body frame 11 between
The cutter housing 25 is supported by the body frame 11 so as to be able to move up and down by a link mechanism 26. The cutter housing 25 is formed in a dish shape with an open bottom, and a pair of cutters 27 ₁ and 27 ₂ are rotatably housed in the cutter housing 25. On both sides of the cutter housing 25, scalp rollers 28, 28 that roll on the ground to define the lowermost position of the cutter housing 25 are pivotally supported. The link mechanism 26 includes a pair of front links 29 connecting the front portion of the body frame 11 and the front portion of the cutter housing 25, and a pair of rear portions connecting the middle portion of the body frame 11 and the rear portion of the cutter housing 25. And a link 30 to form a so-called parallel link.
By operating the raising / lowering operation lever 31 disposed on the left side of 7, the cutter housing 25 can be raised / lowered with its posture with respect to the ground being constant. On the cutter housing 25, driven pulleys 33 ₁ , 3 coaxially connected to both cutters 27 ₁ , 27 _2.
3 ₂ is arranged. On the other hand, a driving pulley 34 is fixed to the crankshaft 22 of the engine E, and an endless belt 35 is wound around the driving pulley 34 and both driven pulleys 33 ₁ and 33 ₂ to form a winding transmission system 36. Is done.
Thus, the wrapping transmission system 36 is driven in accordance with the turning operation of the operation shaft 32 which is disposed to extend vertically in the column portion 16a.
It is possible to switch between a clutch-on state in which the endless belt 35 is tensioned and a clutch-off state in which the tension state of the endless belt 35 is relaxed.
7 is fixed. The engine E is forcibly air-cooled, and the air after cooling the engine E is supplied to a muffler storage chamber 3 formed below the front portion of the body frame 11.
8 is introduced. A muffler 39 connected to the engine E is stored in the muffler storage chamber 38, and the air after cooling the engine is used for cooling the muffler 39. A pair of pipe-shaped bumpers 40, 40 extending in the horizontal direction with a vertical interval are arranged at the front position of the muffler storage chamber 38.
Reference numerals 0 and 40 are fixedly supported by the front end of the vehicle body frame 11. A front axle frame 41 having a substantially U-shaped cross-sectional shape which opens downward and forms a rear wall of the muffler storage chamber 38 is provided below the body frame 11 behind the muffler 39. Is fixed. A front axle beam 42 is inserted into the front axle frame 41, and the front axle beam 4
The center portion of the front axle frame 4 is pivotable by a support shaft 43 having an axis extending in the longitudinal direction of the vehicle body frame 11, that is, the front-rear direction of the riding lawn mower.
Supported by 1. At both ends of the front axle beam 42,
The front wheel W _F, W _F bearing a wheel shaft 4 formed in a substantially L-shape
5 and 45 are respectively supported to be steerable, and axle 4
Knuckle arms 46, 46 connected to upper ends of 5, 45
The front ends of the tie rods 47 are connected to the tie rods 47, 47, respectively. Referring to FIGS. 4, 5, 6 and 7, the rear ends of the tie rods 47, 47 are commonly connected to a pitman arm 48. (See FIGS. 1 and 2), the steering angle of the steering handle 49 is increased by the pitman arm 48 via the steering shaft 50, the driving gear 51, the driven gear 52 and the rotating shaft 53.
Is transmitted to The body frame 11 is formed by connecting upper ends of a pair of vertical frame portions 11a, 11a extending in the front-rear direction so as to be parallel to each other by a connecting portion 11b. Is supported from above. Thus, the support frame 15
Are both vertical frame portions 11a of the body frame 11,
A substantially U-shaped frame 54 formed by connecting upper ends of a pair of side support portions 54a, 54a fixed to the outer side surfaces of the vehicle body frame 11 with an upper support portion 54b; Both side support portions 54 between the support portions 54b
a and a lower support portion 55 provided between the first and second support members 54a. The steering shaft 50 includes an upper support 54b.
A first bush 57 that engages from below with a first bracket 56 that is detachably attached to the upper surface of the lower case, and a lower support portion 55
The second bush 58 is engaged with the upper surface of the second bush 58 from above. The upper support portion 54b is provided with a hole 59 through which the steering shaft 50 is inserted.
Is detachably attached to the upper surface of the upper support portion 54b so as to straddle the portion provided with the hole 59 from above. The first bush 57 is provided with a first bush 57 that protrudes radially outward.
It has a flange 57a at its lower end and is formed in a cylindrical shape. The flange 57a is inserted into the first bracket 56 so as to prevent rotation about the axis, and the first flange 57a is moved downward from the first bracket 57a.
It is engaged with the bracket 56. The second bush 58
Is formed in a cylindrical shape with a second flange portion 58a protruding radially outward at the upper end, and as shown in FIG. The second flange 58a is engaged with the lower support 55 from above. At a plurality of locations spaced apart in the circumferential direction of the steering shaft 50, caulking projections 60 are provided so as to engage with the lower surface of the first flange 57a. Further, the driving gear 51 is
A thrust support is provided on the upper surface of the flange portion 58a, and a fitting groove 61 which extends along the radial direction of the steering shaft 50 and is closed at both ends is provided on a surface of the drive gear 51 opposite to the second bush 58. Is provided, and the steering shaft 50 is provided.
The pin 62 penetrating through in the radial direction
Is fitted to. The rotating shaft 53 includes a third bush 63 which is engaged with the upper surface of the lower supporting portion 55 from above, and the body frame 11
Is inserted through the fourth bush 64 engaging with the second bracket 65 attached to the second bracket 65 from below. Third bush 63
Is formed in a cylindrical shape with a third flange 63a protruding radially outward at the upper end, and is inserted into the lower support portion 55 so as to prevent rotation around the axis. The three flanges 63a are engaged with the lower support 55 from above.
The second bracket 65 is connected to the connecting portion 1 of the body frame 11.
1b is attached to the upper surface of the connecting portion 11b so as to fit into the opening 87 provided in the connecting portion 11b from above.
The fourth bush 64 is formed in a cylindrical shape with a fourth flange portion 64a protruding radially outward at a lower end, and is prevented from rotating around an axis.
5, the fourth flange 64a is engaged with the second bracket 65 from below. The driven gear 52 is a sector gear, and is fixed to the upper end of the rotating shaft 53 by welding.
On the third flange 63a. Referring also to FIG. 9, the fourth bush 64
Below this, the rotating shaft 53 is coaxially surrounded and bent by a cylindrical pitman arm shaft 66, and the pitman arm 48 is fixed to the pitman arm shaft 66. Moreover, the rotating shaft 53
On the outer surface of the pitman arm shaft 66 and the inner surface of the pitman arm shaft 66, axially extending grooves 67, 68 are provided so as to correspond to each other, and a key 69 is fitted into the grooves 67, 68. Therefore, the pitman arm shaft 66 cannot be rotated relative to the rotation shaft 53 and is inserted into the rotation shaft 53.
At the lower end of the rotating shaft 53, a support flange 70 that contacts the lower end of the pitman arm shaft 66 is fastened by a bolt 71. The pitman arm shaft 66 is connected to the lower surface of the fourth flange portion 64a and the support flange 70. Will be sandwiched between. The both side support portions 54a, 54a of the frame 54 of the support frame 15 extend below the body frame 11, and these side support portions 54a, 54a.
A stopper 72 that regulates the upper limit position of the cutter housing 25 is fixed to the lower end of “a”. That is, the stopper 72 includes a regulating plate portion 72a that is horizontally disposed substantially corresponding to the entire width of the vehicle body frame 11, and a pair of mounting plate portions 72b that extend upward at right angles to both ends of the regulating plate portion 72a.
The mounting plate portions 72b, 72b overlap and abut on the inner surfaces of the side support portions 54a, 54a of the frame 54, and each pair of bolts is formed. 73, 73, the side support portions 54a, 54a
Is combined with Thus, the mounting plate portion 72b is provided with four insertion holes 74 corresponding to each apex position of the right quadrangle, and two insertion holes 74 at diagonal positions of the right quadrangle. The mounting plate 7 is secured by bolts 73, 73
2b is connected to the side support portion 54a, so that the stopper 72 is attached to the side support portions 54a, 54a without selecting the left and right sides of both mounting plate portions 72b, 72b. The stopper 72 has a function of regulating the upper limit position of the cutter housing 25 by bringing the upper surface of the cutter housing 25 into contact with the regulating plate portion 72a.
It also has a function of covering the connecting portion of the pitman arm 7 and the pitman arm 48 from below. Both ends of the support 54a, 54a of the frame 54 on the rear side of the stopper 72 are connected to both ends of the support 5a.
Pedal shaft 75 projecting outward from 4a, 54a
At one end of the pedal shaft 75, a lower end of a brake lever 76 disposed on a platform 16b provided integrally with the cover 16 on the right side of the column 16a is rotatably supported. A brake pedal 77 is attached to the upper end of the brake lever 76.
The other end of the pedal shaft 75 has a column portion 16a.
The lower end of a clutch lever 78 disposed on a platform 16c provided integrally with the cover 16 is rotatably supported on the left side of the cover 16 and a clutch pedal 79 is attached to the upper end of the clutch lever 78. Further, an interlocking link mechanism 80 disposed in the support frame 15 is provided between the brake lever 76 and the clutch lever 78, and the interlocking link mechanism 80 is provided for the brake lever 76 in accordance with the depression operation of the brake pedal 77. The clutch lever 78 is interlocked and rotated by the rotation.
The brake lever 78 is not linked to the rotation of the clutch lever 78 in response to the stepping operation of the brake lever 78. Further, return springs 81, 8 are provided between the brake lever 76 and the clutch lever 78 and the vehicle body frame 11.
2 are respectively contracted. Incidentally, the side support portions 54a, 54a of the frame 54 in the support frame 15 are provided with support flange portions 83, 83 which are turned outward.
3,83, the platform 16 of the cover 16
floor mount pipes 84, 84 for supporting b, 16c
Is concluded. Also, both floor mount pipes 84, 84
Are fastened to the vehicle body frame 11 together with the second bracket 65, and the number of parts is reduced by sharing the fastening parts of the second bracket 65 and the floor mount pipes 84, 84 to the vehicle body frame 11. Further, in the side support portions 54a, 54a of the frame 54, support flange portions 85, 85 which are turned outward are provided above the support flange portions 83, 83, and these support flange portions 85 are provided. , 85, the cover 16 is fastened directly. Next, the operation of this embodiment will be described. The steering shaft 50 to which the steering handle 49 is attached at the upper end is engaged with the first bracket 56 detachably attached to the upper surface of the upper support portion 54b from below. The first bush 57 having the first flange portion 57a and the second bush 58 having the second flange portion 58a engaged with the upper surface of the lower support portion 55 from above are inserted into the steering shaft 5.
0, the caulking protrusion 6 engaging with the lower surface of the first flange 57a.
.. Are provided at a plurality of places spaced apart in the circumferential direction.
The drive gear 51 that is supported by the upper surface of the flange 58 a in the thrust direction is fixed to the steering shaft 50. Therefore, the upward movement of the steering shaft 50 is restricted by the engagement of the caulking projections 60 from below with the first flange 57a, and the downward movement of the steering shaft 50 is controlled by the second gear 58a. When the steering shaft 50 is restricted from moving up and down, the steering shaft 50 is rotatably supported by the first and second bushes 57 and 58. Thus, the first bracket 56
The steering shaft 50 may be mounted on the support frame 15 from above and then mounted on the upper support portion 54b. In addition, the relative rotation of the drive gear 51 with respect to the steering shaft 50 is prevented by an extremely simple operation of merely fitting the pin 62 penetrating the steering shaft 50 into the fitting groove 61 of the drive gear 51, and the shaft of the drive gear 51 is prevented. Second direction movement
The drive gear 51 is regulated by the bush 58 and the pin 62.
Can be substantially fixed to the steering shaft 50. A rotating shaft 53 having a driven gear 52 fixed at its upper end is attached to a third bush 63 having a third flange 63a which engages from above with an upper surface of a lower supporting portion 55, and is attached to the vehicle body frame 11. The second gear 65 is inserted through a fourth bush 64 having a fourth flange 64a engaged with the second bracket 65 from below, and the driven gear 52 is thrust supported on the upper surface of the third flange 63a. A pitman arm shaft 66 that prevents relative rotation and surrounds the rotating shaft 53 is sandwiched between the lower surface and the support flange 70 fastened to the lower end of the rotating shaft 53. Therefore, the upward movement of the rotating shaft 53 is restricted by the upper end of the pitman arm shaft 66 abutting on the fourth flange 64a, and the downward movement of the rotating shaft 53 is controlled by the third gear 63a. The rotation shaft 53 is rotatably supported by the third and fourth bushes 63 and 64 in a state where the vertical movement is restricted. The drive gear 51 and the driven gear 52 are meshed with each other above the lower support portion 55. The upper support portion 54b, the lower support portion 55, and both side support portions 54a, 54a of the support frame 15 are The two gears 51 and 5 are provided so as to protect the drive gear 51 and the driven gear 52 from the surroundings.
2, the gears 51 and 52, which are important parts, can be reliably prevented from falling down, and the gears 51 and 52 can be protected by the support frame 15.
In addition, each component from the steering shaft 50 to the rotating shaft 53 can be prepared as an assembly assembled to the support frame 15, and the assembly can be mounted on the vehicle body frame 11, so that the assembly work can be performed. It will be easier. Further, the second and third bushes 58, 63
Is arranged on the lower support portion 55, so that the distance between the steering shaft 50 and the rotation shaft 53 can be accurately determined. A stopper 72 having a regulating plate 72a is fixed to the lower end of the support frame 15, and the upper limit position of the cutter housing 25 is regulated by the upper surface of the cutter housing 25 contacting the regulating plate 72a. Is done. That is, when the cutter housing 25 is pushed up while the riding lawn mower is running on the ground with steps or irregularities, the upper limit position is regulated by the regulating plate portion 72a. Since the restricting plate portion 72a extends horizontally substantially corresponding to the entire width of the body frame 11, even if the cutter housing 25 is tilted to the left or right, it is entirely in contact with the restricting plate portion 72a. The posture of the cutter housing 25 is corrected so as to be in contact with the cutter housing 25, and a large load can be prevented from locally acting on the cutter housing 25 by receiving the pushing-up force on the entire surface of the regulating plate 72 a. Further, the stopper 72 is provided so as to connect between the lower end portions of the side support portions 54a, 54a of the support frame 15, and can also fulfill the function of reinforcing the support frame 15, and furthermore, can support the support frame 15. The tie rods 47, 47 and the pitman arm 48 disposed in the cover 15 can be covered from below to perform a protective function. Further, the upper limit position of the cutter housing 25 can be easily changed by changing the mounting position of the stock 72 on the support frame 15. Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the appended claims. It is possible. As described above, according to the first aspect of the present invention, the stopper having the regulating plate portion which can be brought into contact with the upper surface of the cutter housing and which extends substantially in parallel with the entire width of the body frame is provided. , Fixed to the support frame attached to the body frame
Since the even cutter housing pushed up inclined to right or left, the cutter so as to contact the entire surface of the restricting plate portion by abutting the restricting plate portion extending horizontally substantially corresponds to the entire width of the body frame housing Is corrected, and a locally large load can be prevented from acting on the cutter housing. The support frame is a support frame for supporting each component of the steering device from the steering shaft to the pitman arm. The support frame is provided at a position covering the connection between the pitman arm and the tie rod from below .
Since the topper is fixed, the stopper for correcting the upper limit position of the cutter housing can have a function of reinforcing the support frame and a function of protecting the connection between the pitman arm and the tie rod.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a riding lawn mower. FIG. 2 is a plan view of the riding lawn mower. FIG. 3 is an enlarged sectional view taken along line 3-3 of FIG. 1; FIG. 4 is an enlarged sectional view taken along line 4-4 of FIG. 3; FIG. 5 is a sectional view taken along line 5-5 in FIG. 4; FIG. 6 is a view taken along line 6-6 of FIG. 5; FIG. 7 is a sectional view taken along line 7-7 of FIG. 5; FIG. 8 is a sectional view taken along line 8-8 in FIG. 5; FIG. 9 is an enlarged sectional view taken along line 9-9 of FIG. 5; [Description of Signs] 11 Body frame 15 Support frame 25 Cutter housing 27 ₁ , 27 ₂ Cutter 47 Tie rod 48 Pitman arm 50 Steering shaft 72 ... stopper 72a ··· regulation plate portion W _F ··· front wheel W _R ··· rear wheel

Claims (1)

( ₁ ) The cutter housing (25) in which the cutters (27 ₁ , 27 ₂ ) are rotatably housed is provided with a front wheel (W).
_F ) and a rear lawn mower that is supported on the body frame (11) so as to be able to ascend and descend between the rear wheel (W _R ) and the body frame (11) includes a steering device of the steering device.
From the tearing axis (50) to the pitman arm (48)
Support frame (15) for supporting each component at
The support frame (15) has a cutter housing (2).
A stopper (72) having a regulating plate portion (72a) extending in parallel with the entire width of the body frame (11) so as to be able to abut on the upper surface of the pitman arm (48) and the pitman arm (48).
And the connecting part of the tie rod (47) from below.
Characterized in that it is secured, the cutter housing upper limit position regulating equipment in riding lawn mower.