JP3376596B2 - Speed change gear for walking lawn mower - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission, and more particularly, to a speed change gear that is arranged in the axial direction, and a speed change key that is operated and moved along the axial direction. By engaging with the groove, it can be used for a transmission gear device in a form of shifting gears,
It is used as a traveling transmission for a walking lawn mower . 2. Description of the prior art, and the object of the invention is to be Solved by tiger
Front and rear mission cases in powered vehicles such as
Transmissions that are shared and built into the transmission case
Space between the front and rear mission cases according to the specification change.
There is known one in which a sensor is interposed . However, in such a configuration, since the spacers are simply interposed according to the specifications of the transmission to be added or changed, the weight of the spacers themselves and the size of the spacers are unnecessarily large. And the production cost increases. [0003] The present invention has the above-mentioned problems.
It is proposed for the purpose of eliminating
Therefore, the following technical measures were taken. That is, a plurality of transmission gears 1, 2, 3 having keyways 6, 7, 8 on the inner periphery.
Are arranged in the axial direction of the speed change shaft 4 and are freely rotatably fitted. The axle 15 parallel to the speed change shaft 4 has gears 1, 2, 2 on the speed change shaft 4.
Gears 16, 17, and 18 always meshing with 3 are fixed to axle 15.
The shift key 5 slid along the axis of the speed change shaft 4 is engaged with the key grooves 6, 7, 8 of any one of the speed change gears 1, 2, 3 so as to perform the speed change. In the speed change transmission of a walking lawn mower, the speed change shaft 4
And the gear cases 9 and 10 supporting the axle 15
To form a cut surface 11, 12 is divided in a vertical direction perpendicular to the
And one gear case 10 is orthogonal to the transmission shaft 4.
The input shaft 19 is supported and provided in the
Between the gear case 10 and the opposite gear case 9 or
A speed change of a walking lawn mower characterized in that the number of speed steps is increased by interposing a spacer case 13 having a width corresponding to a speed change gear width to be removed , or the number of speed steps is reduced by removing the spacer case 13. The structure of the transmission shall be used. When performing a gear shift, the shift key 5 is moved in the axial direction of the shift shaft 4 to engage with any one of the key grooves. The transmission gears 1 to 3 of the key grooves 6 to 8 in which the transmission key 5 is engaged are rotated integrally with the transmission shaft 4 to perform transmission. As shown in the example of FIG.
3 and the spacer case 13 is interposed,
To reduce the number of gears, the transmission gear 3 is disengaged from the transmission shaft 4 and the spacer case 13 is also mounted on the gear cases 9 and 1.
0 from the split surfaces 11 and 12 and again the gear case 9 and 1
0, the number of gears becomes
And the axial width of the gear cases 9 and 10 can be reduced. Conversely, when increasing the number of gears, the gear case 9, 10 becomes wider by the required width by interposing the spacer case 13. [0005] As described above, the present invention provides an additional or additional device.
Spacer cable having a width corresponding to the shifting gear width
Walk with the gear 13 interposed between the two gear cases 9 and 10
Because it constitutes the transmission of a lawn mower,
To quickly increase or decrease the number of gear stages.
Compliant and does not require a large spacer, so the configuration is simple
And can be constructed inexpensively. Moreover, the gear case
9 and 10 support the transmission shaft 4 and the axle 15
The point that the input shaft 19 is supported by the gear case 10 on the side
Since the number does not change before and after the change, the
The image remains the same, and this change
The construction cost does not increase . DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A case where the present invention is applied to a hand mower traveling transmission will be described. Left and right pair of wheels 1
The transmission axle 15 and the transmission shaft 4 are supported over the gear cases 9 and 10, and the transmission gears 1 to 3 on the transmission shaft 4 always mesh with the gears 16 to 18 on the axle 15. The gear case 10 is selectively engaged with the shift gears 1 to 3 by the shift key 5 which is operated and moved along the shift shaft 4 so that the gear case 10
From the input shaft 19, the transmission shaft 4 and the transmission gear 1
-3 and any one of the gears 16-18 are transmitted to the wheels 14 via the axle 15. The speed-change shaft 4 is fitted with a speed-change key 5 along an axial groove 20 on the shaft core, and can be freely moved.
1 and a shift pin 22 is provided on the outside, and the outer end of the shift pin 22 is pressed by a shift arm 24 pivotally operated around an arm shaft 23 against the gear case 9, and the spring 21 is The shift position of the shift key 5 is selected by moving the shift key 5 in the axial direction. The transmission gears 1 to 3 are provided on the transmission shaft 4.
In addition, a bevel gear 26 meshed and rotated from a bevel gear 25 of the input shaft 19, a clutch 28 which is moved in the axial direction by operating a clutch shifter 27 between the bevel gear 26 and the transmission shaft 4, and turns on and off the transmission. Provided. Key grooves 6 to 8 in which the shift keys 5 are engaged are formed in the inner peripheral portions of the shift gears 1 to 3, and the shift gears 1, 2, or 3 engaged with the shift keys 5 shift. It is rotated integrally with the shaft 4. On the axial side of the key grooves 6 and 7 of the transmission gears 1 and 2, there is provided a cylindrical collar portion 29 which slides on the side surface of the adjacent transmission gear and maintains a predetermined interval. 2
9, a neutral portion 30 where the shift key 5 is located is formed as a cavity in the inner peripheral portion. When the shift key 5 is located in the neutral portion 30, any of the shift gears 1 to 9 is formed.
3 is not driven and rotated. The gears 16 to 18 are respectively connected to the axle 1 by pins 31.
5, and a pin groove 32 with which the pin 31 is engaged is formed on the inner peripheral surface. Gear cases 9 and 1 on which the above-described transmission shaft 4, axle 15 and input shaft 19 are mounted.
No. 0 has split surfaces 11 and 12 in the direction perpendicular to the transmission shaft 4 facing the transmission gear 3 and the bevel gear 26, and can be joined from the axial direction side. Spacer case 13 according to the width of provided transmission gears 1 to 3
And tighten it with bolts 33. A boss portion 34 that bears an end of the gear case 9 on the shift pin 22 side of the transmission shaft 4 is
The transmission gears 1 to 3 are formed longer according to the length of the transmission shaft 4.
Is set in advance according to a range that can be further increased to four steps or five steps. The pin hole 3 for inserting the pin 31 into the axle 15 is also provided.
5 is provided. In order to change the number of gears of the transmission gears 1 to 3 and the gears 16 to 18, the number of these gears and the selection of the spacer case 13 in accordance with the gears are changed from 2 to 4 to 5 and so on. Can be changed. In this case, if the split surface 11 of the gear case 9 and the split surface 12 of the gear case 10 are directly engaged with each other, if the two-stage shift is performed by the engagement of the transmission gears 1 and 2 with the gears 16 and 17, three stages are provided. At the time of specification, since the transmission gear 3 and the gear 18 may be added,
A spacer case 13 corresponding to the axial direction of the transmission gear 3 or the like may be interposed between the two gear cases 9 and 10. The same applies to the case where the number of gears is changed to four or five. In this case, instead of adding the spacer cases 13 over a plurality of sheets, an independent spacer case 13 having a width corresponding to the increased transmission gear width is used. In the hand mower, an engine E is mounted on the upper side of a mower deck 36, a cutting blade 38 is mounted on a lower side by a vertical cutting blade shaft 37, and a gauge wheel 40 which can be adjusted vertically by a lever 39 is provided on the front side. The wheel 14 is mounted on the rear side. Reference numeral 41 denotes a control handle, and reference numeral 42 denotes a collector for accommodating the cut grass turf discharged from the discharge port 43 at the rear of the mower deck 36. The input shaft 19 is an engine E
From the middle of a transmission case 48 that transmits the cutting blade shaft 37 through the transmission shaft 44. Reference numeral 45 denotes a gear, which interlocks the wheel shaft 46 of the wheel 14 from the axle 15. 47 is a lever for adjusting the height of the wheel 14. At the lower side of the mower deck 36, the cutting blade shaft 3
The cutting blade 38 in the form of a straight plate attached to the lower end of 7 has a shaft hole 49 formed in the center part, and fits into the spacer 51 inserted into the bolt 50 which is screwed into the cutting blade shaft 37 from the lower end side. The upper surface of the cutting blade 38 is pressed by a lining 54 on the lower surface of a boss 53 fixed to the cutting blade shaft 37 by a key 52, and the lower surface of the cutting blade 38 is received by a leaf spring 55 fitted to the bolt 50. By tightening the bolt 50, the bolt 50 is pressed between the boss 53 and the spring 55 to be clamped and fixed. 56 is a washer for receiving the leaf spring 55. The leaf spring 55 has a disk shape and is distorted or distorted in a mountain shape downward. The outer edge portion 58 on the outer periphery of the distorted portion 57 is brought into pressure contact with the lower surface of the cutting blade 38 to form a washer 56. The outer edge is located closer to the center than the distorted portion 57 of the leaf spring 55 and pressed.

[Brief description of the drawings] FIG. 1 is a plan sectional view of a wheel transmission unit. FIG. 2 is a side sectional view of a mower deck. FIG. 3 is a bottom view thereof. FIG. 4 is a side view of the cutting blade shaft. FIG. 5 is a perspective view of the entire mower. [Explanation of symbols] 1 transmission gear 2 speed change gear 3 speed change gear 4 Speed change shaft 5 Shift key 6 keyway 7 Keyway 8 Keyway 9 Gear case 10 Gear case 11 Split face 12 split face 13 Spacer case

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16H 3,57 A01D 34

Claims (1)

(1) A plurality of transmission gears (1, 2, 3) having key grooves (6, 7, 8) on the inner periphery thereof are arranged in the axial direction of the transmission shaft (4) so as to be freely rotatable. An axle 15 parallel to the transmission shaft 4 has gears 16, 17, 17 always engaged with the gears 1, 2, 3 on the transmission shaft 4.
18 is fixedly mounted on the axle 15, and the shift key 5 slid along the axis of the shift shaft 4 is engaged with the key grooves 6, 7, 8 of one of the shift gears 1, 2, 3. In the speed change transmission of a walking lawn mower configured to perform a speed change, the gear cases 9 and 10 supporting the speed change shaft 4 and the axle 15 are divided in a vertical direction orthogonal to the speed change shaft 4 to form split surfaces 11 and 12. And one of the gear cases 10
By supporting the input shaft 19 in a direction orthogonal to the speed change shaft 4
Of the gear case 10 and the gear case 9 on the opposite side.
In the meantime, it corresponds to the shifting gear width to be added or removed
A walking type characterized in that the number of gears is increased by interposing a spacer case 13 having a width , or the number of gears is reduced by removing the spacer case 13.
Gear transmission for lawn mowers .