JPS63188534A - Speed controller for vehicle - Google Patents

Abstract

PURPOSE:To prevent poor action of a device due to adhesion of mud, by a method wherein a governor case is formed to the body of a throttle valve, and a governor mechanism and a link mechanism through which to intercouple the governor mechanism and a throttle valve stem are contained in the case. CONSTITUTION:A speed control device 35, formed with a throttle valve 9 and a governor case 47 for containing a governor mechanism 50 and a link mechanism 68, is connected to the downstream side of a carburetter in a suction passage. A disc-shaped valve disc 49a is rotatably supported within a governor body 46 by the throttle valve 49 with the aid of a rotary shaft 49b. The one end of the rotary shaft 49a is protruded in the governor case 47 secured to the governor body 46 by means of a bolt 48, and its protruding end is coupled to a governor mechanism 50 through a link mechanism 68 formed with a folk 55, an arm 57, and a rod 59. The governor mechanism 50 is formed such that the folk 55 is rocked through a collar 54 by folding and unfolding movement of a pair of weights 53 located on a governor shaft interlocked with an engine.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a speed control device for a vehicle, and in particular, a speed control device equipped with an output output shaft (hereinafter referred to as a PTO shaft) for driving external equipment such as a lawn mower or a sprayer. In vehicles for traveling on rough terrain, PF P
The present invention relates to a speed control device suitable for keeping the rotational speed of a TO axis constant.

[Conventional technology]

It is desirable for the performance and life of the external equipment to be operated at a constant speed as much as possible, at least within a range that does not exceed its rated speed.On the other hand, in the off-road vehicle equipped with the PTO shaft, the engine Generally, the rotation is directly transmitted to the PTO shaft at a predetermined reduction ratio, so when the engine rotation changes, the driving speed of the external equipment also changes. Therefore, in the PTO mode for driving external equipment, it is desirable to operate the engine at a constant speed.

However, it is difficult to operate this engine at a constant speed with manual speed control using a slot bar during normal driving.

Therefore, conventionally, as a speed control device that enables constant speed operation of the above-mentioned engine, a governor mechanism is installed on the PTO shaft, for example, and has a lever that swings according to the shaft and the engine rotational speed, and the governor mechanism is installed in the intake passage. A throttle valve controlled by the governor mechanism is provided, and an arm fixed to the rotating shaft of the throttle valve and the swing lever are connected by a cable, and when the engine speed increases, the throttle valve is adjusted accordingly. There is a device that closes the
(See Publication No. 163028).

[Problem that the invention seeks to solve]

By the way, due to its nature, the above-mentioned off-road vehicle travels while kicking up mud and the like, especially in the above-mentioned PTO mode. Therefore, in a vehicle equipped with the above-mentioned conventional speed control device, this mud and the like tend to adhere to the connection portion between the cable and the swing lever or the arm of the rotating shaft, which may impair the smoothness of operation. One way to solve this problem is to surround the above connection with a seal cover, but in this case,
The connection between the swing lever and the cable and the connection between the cable and the arm of the rotating shaft must be surrounded by rubber boots, etc., which increases the number of parts and assembly man-hours, and complicates the structure. This causes high costs.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, an object of the present invention is to provide a speed control device for a vehicle that can prevent malfunctions due to adhesion of mud and the like, and does not have a complicated structure.

[Means for solving problems]

The present invention provides a speed control device for a vehicle equipped with a throttle valve and a governor structure for controlling the opening and closing of the throttle valve. The present invention is characterized in that a governor mechanism and a link mechanism connecting the mechanism and a rotating shaft are housed in the governor case.

[Effect]

According to the vehicle speed control device according to the present invention, since the governor mechanism and the link mechanism are housed and arranged in the governor case integrated with the body of the throttle valve, the link mtz and the governor a structure or the throttle valve Since the connecting portion with the rotating shaft is not exposed to the outside and therefore the mud and the like will not adhere to it, the above-mentioned problem of malfunction can be solved. Furthermore, since the link mechanism and the governor mechanism are entirely housed within the governor case, the connection can be sealed as is, and the problem of complicating the structure due to the seal as described above does not arise.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 7 are diagrams for explaining a vehicle speed control device according to an embodiment of the present invention.
This is an example applied to an off-road vehicle equipped with an O-axis.

In the figure, reference numeral 1 denotes an off-road vehicle to which this embodiment is applied, and a pair of left and right steering front wheels 3 are provided at the front end of a body frame 2 of this vehicle, and a left steering wheel is provided at the rear end.

A pair of right rear driving wheels 4 are attached, and wide ultra-low pressure so-called balloon tires are used on both axles. Further, a steering handle 5 is mounted above between the left and right front wheels 3.3, and a fuel tank 6 and a saddle-shaped seat 7 are mounted in this order behind the steering handle 5. Note that 8.9 is a front fender and a rear fender for preventing mud and the like from scattering from the wheels.

Further, a forced air-cooled four-stroke engine 10 is mounted approximately in the center of the vehicle body frame 2, and a transmission 12 is disposed within the crankcase 1) of the engine lO, and the rotation of the crankshaft 13 is controlled by a clutch. 14. After passing through the transmission 12, the output shaft 15 is input into the reducer case 16, and after being decelerated by the reducer 17, the transmission shaft 19. Differential mechanism 20. The signal is transmitted to the rear wheels 4 via the rear wheel shaft 21.

22 is a PTO drive shaft, and the crankshaft 1 is attached to this shaft 22.
3 is transmitted through the gear 1B of the clutch 14 and the intermediate gear 23,
is constantly driven by the engine 10.

In addition, 1) The rotation of the PTO drive shaft 22 is controlled by ■PTO switching clutch 24 consisting of a heald and a tension pulley;
It is transmitted to the PTO shaft 26 via the bevel gear 25.

Further, an intake passage 31 is connected to the engine 10, the upstream end of the passage 31 is connected to an air cleaner 32, and the downstream side thereof is connected to a carburetor 34.
is manually controlled by a throttle lever 5a provided on the steering handle 5. And this carburetor 34 and engine 10
Is there really a speed limit between the two? 1) Device 35 is connected. This speed control device 35 is connected to a governor clutch 37 by a transmission cable 36.

The governor clutch 37 is for transmitting or blocking the rotation of the PTO drive shaft 22 to the speed control device 35. Clutch case 37a of the governor clutch 37
is integrally formed on the right rear end of the crankcase 1). A clutch shaft 38 is rotatably inserted into the clutch case 37a, and a cap 45 is attached to the upper end of the clutch shaft 38. Further, one end of the transmission cable 36 is inserted into and engaged with an engagement hole 38a formed at the upper end of the clutch shaft 38, and the end of the outer cable is fitted and fixed within the camp 45. Further, although not shown, a helical gear formed on the PTO drive shaft 22 meshes with a drive gear 39 rotatably mounted on the lower end of the clutch shaft 38 .

A slider 40 is mounted on the clutch shaft 38 above the drive gear 39 so as to face the drive gear 39 and to be slidable in the axial direction. Further, the slider 40 is configured to rotate together with the clutch shaft 38 by an engagement pin 41, and is further urged toward the drive gear 39 by a biasing spring 44. A dog pawl 40a that engages with the drive gear 39 is protruded from the lower end of the slider 40, and a sliding groove 40b is recessed above the dog pawl 40a.
A lift bin 42a of a lift shaft 42b rotatably supported by the clutch case 37a is inserted inside.

A lever lever 42 is fixed to the outer end of the lift shaft 42b, and a governor lever 43 is rotatably mounted inside the lever. The governor lever 43 is biased counterclockwise in FIG. 5 by a biasing spring 43a, and a pressing piece 43b fixed to the lever 43 presses the lift lever 42. One end of a governor failure cable 63 is connected to the governor lever 43, and the other end of the cable 63 is connected to a governor switching lever 62 disposed at the front of the crankcase 1).

The speed control device 35 includes a throttle valve 49, a governor mechanism 50, and a governor case 4 that accommodates a link machine t16B.
It consists of 7. The throttle valve 49 has a circular valve plate 4 inside a governor body 46 that forms a part of the intake passage.
9a is rotatably supported by a rotating shaft 49b. The governor case 47 is fixed to the governor body 46 with bolts 48, and the governor case 47 has M61 bolts.
is installed. One end of the rotating shaft 49b of the throttle valve 49 faces the inside of the governor case 47.

The governor machine tJ50 is arranged at the bottom of the governor case 47, and the governor shaft 51 of the mechanism 50 is connected to the case 47.
is rotatably supported. The other end of the inner cable of the transmission cable 36 is inserted into and engaged with the retaining hole 51a formed at the outer end of the governor shaft 51, and the end of the outer cable is inserted into the connection part 47a of the governor case 47. Fitted and fixed. Further, a weight bracket 52 is attached to the governor shaft 51 so as to rotate together with the governor shaft 51, and a pair of weights 53 are swingably supported within the weight bracket 52. Further, a collar 54 is attached to the front part of the governor shaft 51 so as to be slidable in the axial direction, and the pressing arm 53a of the weight 53 can come into contact with the rear end of the collar 54.

The tip of the collar 54 is in contact with the fork 55 of the link mechanism 68. The link mechanism 68 is for converting the back and forth movement of the collar 54 of the governor mechanism 50 into the rotational movement of the throttle valve 49. this fork 5
A boss portion 55a formed at the upper end of the governor case 55 is rotatably supported by the governor case 47 via a support shaft 56. The lower end of the fork 55 is connected to a NAND member 65 via a biasing spring 64, and the nut member 65 is screwed into an adjustment bolt 66. Note that 67 is a biasing spring that biases the adjustment bolt 66 inward. Further, a lower end portion 57a of the arm 57 is located outside the boss portion 55a of the fork 55, and is fixed to the fork 55 with a bolt 58. Furthermore, one end of a rod 59 is engaged with the upper end of the arm 57, and the other end of the rod 59 is engaged with a valve arm 60 fixed to the rotating shaft 49b of the throttle valve 49. Further, a biasing spring 59a is interposed between the valve arm 60 and the arm 57.

Next, the effects of this embodiment will be explained.

During normal driving, since the governor switching lever 62 is located on the OFF side, the governor clutch 37 is in the disconnected state shown in FIG. First, the collar 54 is located at the rearward end, and the throttle valve 49 is fully open. Therefore, the carburetor 34 is opened and closed according to the opening degree of the throttle lever 5a, and the engine lO is
It rotates at a rotation speed that corresponds to the opening degree. The rotation of the engine 10 causes the transmission 12. After the speed is changed by the reducer 17,
The signal is transmitted to the rear wheels 4, so that the vehicle 1 runs at a speed corresponding to the opening degree of the throttle lever 5a.

In the PTO mode, when the governor switching lever 62 is switched to the ON side and held in this position, the carburetor 34 is held at a predetermined opening degree, and the governor lever 43 is turned on by the biasing spring 43a.
5 in the clockwise direction in FIG. 5, and in response, the slider 40 is moved toward the drive gear 39 by the spring force of the biasing spring 44 and engaged with the drive gear 39. Then, this results in
The rotation of the PTO drive shaft 22 is caused by the drive gear 39. The signal is transmitted from the clutch shaft 38 to the governor shaft 51 of the governor mechanism 50 via the transmission cable 36. As a result, the governor shaft 51 rotates, the weight 53 swings outward, and its pressing arm 53
a moves the collar 54 forward. Then, the fork 55° arm 57 of the link mechanism 68 rotates clockwise in FIG. 3, and rotates the rotating shaft 49b, that is, the valve plate 49a, in the direction in which the intake passage is closed. In this way, the higher the rotational speed of the engine 10, the more the intake passage is closed, and as a result, the engine 10 operates at a predetermined constant speed.

When the PTO (not shown) is switched in this state, the governor switching lever 62 is fixed to the ON side, and the rotation of the engine 10 is shifted to gear 1 of the clutch 14.
8. Intermediate gear 23. From the PTO drive shaft 22 to the PTO switching clutch 24. It is transmitted to the PTO shaft 26 via the bevel gear 25, and the rotational speed of the PTO shaft 26 becomes constant.

As described above, in this embodiment, in the PTO mode, the throttle valve 49 is controlled to open and close so that the intake passage 31 is closed as the engine speed increases, and the rotational speed of the PTO shaft 26 can be kept constant.

As mentioned above, in the conventional speed control device in which the governor mechanism is installed near the PTO shaft, there is a risk that mud, etc. may adhere to the connection between the governor mechanism, throttle valve, and transmission cable, resulting in malfunction. was there. In contrast, in this embodiment, the governor mechanism 50 and link mechanism 68 are integrated into a governor case 47 that is integrated with the body 46 of the throttle valve 49.
Since the connecting portion is housed inside, the connecting portion is not exposed to the outside, and therefore there is no problem of malfunction due to adhesion of mud or the like.

In addition, in order to prevent the adhesion of mud, etc., in the conventional device described above, if the connection part was surrounded by rubber boots, etc., the structure would become complicated, but in this embodiment, the entire governor mechanism 50 and link mechanism 68 are Since it is accommodated in the case 47, the above-mentioned connection portion can be sealed by that alone, and the above-mentioned structural problems will not occur.

In the above embodiment, a speed control device configured such that fuel is discharged from the carburetor 34 also in the governor control '41) has been described, but a governor integrated with a discharge nozzle and a throttle valve exclusively for governor control is described. It can also be a type vaporizer.

Further, in the above embodiment, the body 46 of the throttle valve 49 and the governor case 47 are separate bodies, but they may of course be formed integrally.

〔Effect of the invention〕

As described above, according to the vehicle speed control device according to the present invention, the governor mechanism and linkage mechanism are housed in the governor case integrated with the body of the throttle valve, so malfunction due to adhesion of mud etc. This has the effect of greatly improving the reliability of the device.

[Brief explanation of the drawing]

1 to 7 are diagrams for explaining a speed control device for a vehicle according to an embodiment of the present invention, FIG. 1 is an exploded view showing the overall configuration, and FIG. 3 is a side view with the lid removed, FIG. 4 is a sectional view taken along the line IV-rV in FIG. 3, FIG. 5 is a sectional side view of the governor flange, and FIG. The sectional plan view and FIG. 7 are side views of an all-terrain vehicle to which the embodiment is applied. In the figure, 1 is a vehicle for running on rough terrain, 31 is an intake 1) 1
) path, 35 is a speed control device, 46 is a body, 47 is a governor case, 49 is a throttle valve, 49b is a rotating shaft, 50
68 is a governor B structure, and 68 is a link mechanism.

Claims (1)

[Claims] (1) In a speed control device for a vehicle, which includes a throttle valve disposed in the middle of an intake passage and a governor mechanism that controls opening and closing of the throttle valve so that the engine rotates at a constant speed, the body of the throttle valve is form the governor case,
One end of the rotating shaft of the throttle valve faces inside the case, and the governor mechanism and a link mechanism connecting the governor mechanism and the rotating shaft of the throttle valve are housed and disposed within the governor case. A speed control device for vehicles.