JPH0645729Y2 - Gearbox - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a driven gear train that is rotatably fitted to a driven shaft and is always meshed with a drive gear train, or conversely, is rotatably fitted to a drive shaft. The driven gear train is always meshed with the driven gear train, and an arbitrary gear pair is selectively engaged by a key body slidable along the key groove of the shaft that rotatably supports the gear. The present invention relates to the structure of a device for performing a multi-speed shift, which is configured to obtain a predetermined shift.

[Conventional technology and its problems]

Conventionally, as a key body sliding type transmission of this type,
As shown in the figure, a shifter ring that fits a key body 102 slidable along a key groove 101 of the driven shaft 100 on the outer periphery of the driven shaft 100.
When the shifter ring 103 is integrally formed so as to project from one end portion of the 103, and the shifter ring 103 is slid through a shifter operating rod (not shown), the engaging portion 102a at the tip of the key body 102 is optional. Of the driven gear 104 of the
There is a structure in which the driven shaft 100 is rotated according to the gear ratio with the drive gear 106 that meshes with.

At the time of power transmission, when the engaging portion 102a at the tip of the key body 102 engages with the engaging groove 105 in the inner diameter of the driven gear 14, the key body 1
Great force is applied to the side of 02. However, according to the above configuration, since the key body 102 and the shifter ring 103 are integrally formed, in other words, the key body 102 is connected to the shifter ring 103 only at its base portion, and the base portion is the key. Groove 101
Since it is located inside, a large twisting force or a bending force is generated in the base portion of the key body 102 due to the dimensional difference between the key body 102 and the key groove, and the risk of damaging the base portion of the key body 012 increases.

Particularly, the thickness of the connecting portion between the shifter ring 103 and the base portion of the key body 102 is made thin so that the engaging portion 102 at the tip of the key body 102 is made by its elastic force.
When a is biased toward the engagement groove 105 of the driven gear 104, the risk of breakage is further increased due to the fact that the thickness of the base portion is thin. Further, when the key body 102 is damaged, it must be replaced integrally with the shifter ring 103, which is uneconomical.

In order to eliminate this inconvenience, as shown in FIG. 9, the operating rod 108 is slidably inserted along the axis into the inner diameter hole 107a of the cylindrical driven shaft 107, and the key body 109 is attached to the tip of the operating rod 108. The pin
The key body 109 is rotatably pivotally mounted via 110, and the spring 112 is biased so that the engaging portion 109a at the tip of the key body 109 is projected from the groove hole 111 formed in the driven shaft 107. The joint part 109a is the driven shaft.
A driven gear 113 that is rotatably fitted in 107. Engagement groove 114 on the inner diameter
There is a configuration in which the driven shaft 107 and the operating rod 108 are integrally rotated via the driven gear 113 that engages with the drive gear 115 at a predetermined gear ratio.

According to this configuration, the diameter of the driven shaft 107 becomes large due to the dimensions of the operating rod 108 and the key body 109, and the assembly of the entire device becomes complicated. Further, there is a problem that a large torsional force acts on the connecting pin 110 of the key body 109 and the operating rod 108, and the risk of breakage also increases.

Further, in JP-A-47-39952, an urging spring plate is inserted between the bottom surface of the key groove and the back surface of the key body that can move along the key groove that is long in the axial direction of the driven shaft. On the other hand, the base of the key body is fitted into the recess of the shifter ring fitted on the driven shaft, and the base of the key body and the shifter ring are fitted in the recess by a pin extending in the direction intersecting the axis of the driven shaft. It is proposed that the tip end of the key body is connected and, therefore, is pivoted outward in the radial direction of the driven shaft.

However, in the case of this configuration, while forming the recess and the pin insertion hole in the shifter ring, the base portion of the key body must be pin-coupled, and it takes time to manufacture the shifter ring. Installation work is also troublesome. Further, similarly to the above, due to the dimensional difference between the key body and the key groove, a large twisting force or a bending force is generated at the base of the key body, and the pin having a small diameter is easily damaged.

An object of the present invention is to provide a transmission that can prevent damage to a key body and the like and that can be easily assembled.

[Means for solving problems]

In order to achieve this object, in the present invention, the corresponding gears of the drive-side gear train and the driven-side gear train mesh with each other, and the gears in the one gear train are rotatably supported along the axis line of the shaft. In a transmission in which a key body is slidably inserted into a key groove and the key body selectively engages with an engagement groove of a gear inner diameter portion of the one gear train to shift gears, , A spring body inserted between the bottom surface of the key groove and the bottom surface of the key groove is detachably mounted, and the spring body urges the key body toward the inner diameter groove portion of the one gear, while the key body is A shifter ring, which is rotatably fitted around the axis of the shaft, is provided with a recess that is loosely fitted in the inner diameter portion of the shifter ring, and the shifter ring is configured to be rotatable with respect to the key body.

[Operation and effect of device]

According to the configuration of the present invention, for example, when the key body is engaged with the driven gear, the key body rotates integrally with the driven shaft in the state of being fitted in the key groove, so that the key body is driven by the driven shaft. The surface pressure acts along the rotation direction of.

However, in the present invention, the key body is formed with a recess that fits into the inner diameter of the shifter ring that is rotatably fitted around the axis of the shaft. Not only is it rotatable with respect to the shaft, but it is also rotatable with respect to the key body, so that it is rotated integrally with the shaft and the shifter ring that slides along the axial direction of the driven shaft by an external operation. No twisting or bending force acts on the key body.

Therefore, since no unreasonable force acts on the key body, there is no possibility of damaging the key body.

In the present invention, contrary to the above, the drive side gear train can be rotatably fitted to the drive shaft, and the drive shaft can be provided with the key body and the shifter ring in the same manner as described above.

Further, the key body, the shifter ring, and the spring body are separate structures that can be separated from each other. Therefore, the manufacturing process of each component is also simplified. In addition, since the key body is formed with a recess that is loosely fitted to the inner diameter of the shifter ring, the loosely fitting portion between the key body and the shifter ring is not limited, and the three members can be assembled together in the assembly work as well. All you have to do is a simple work of fitting them together.

Then, for example, when the spring body is damaged or the biasing force is insufficient, only the spring body needs to be replaced, which is economical.

〔Example〕

An embodiment in which the present invention is applied to a speed change mechanism in a seedling planting apparatus will be described below. In the figure, reference numeral 1 denotes a traveling machine body, and the traveling machine body 1 is a vehicle body frame 2 and front wheels 3, 3 attached to a lower surface of a front portion thereof. And rear wheels 5 and 5 mounted on the rear lower surface via axle cases 4 and 4, and a steering seat 6 and a steering handle 7 are provided on the upper surface of the vehicle body frame 2, and the rear wheel 5 is located in front of the axle 9. The power transmission case 10 with the continuously variable transmission 11 is provided on the vehicle body frame 2, and the power transmission case 10 is driven by the driving force of the engine 8 on the front upper surface of the vehicle body frame 2.
The rear wheels 5 are driven via the internal power transmission mechanism and the axle cases 4 and 4, and the front wheels 3 are driven via the propulsion shaft 12.

Reference numeral 13 designates a seedling planting device which is attached to the rear part of the traveling machine body 1 through a parallel link mechanism 14 so as to be movable up and down, and is located above the power transmission case 10 and in front of the axle 9 of the rear wheel 5. The hydraulic cylinder 15 arranged in the above-mentioned section largely drives the seedling planting device 13 up and down through the parallel link mechanism 14.

The seedling planting device 13 includes a transmission case 16 and the transmission case 16
Located on the lower surface of the central planted transmission case 17, and the planted transmission cases 19 and 19 that are mounted at appropriate intervals via the central planted transmission case 17 mounted on one side and the connecting pipe 18 in which the transmission shaft is inserted. Central float 20 and floats 21, 21 arranged on the lower surface of each planted transmission case 19 and a seedling table 22 inclined so that the upper end approaches the traveling body, and the central planted transmission case
On the left and right sides of the rear part of the plant 17 and each planted transmission case 19, a pair of two planting rods 23a are vertically rotated while keeping substantially the same posture and the seedling take-out port and the field in the seedling take-out plate 31 on the lower end side of the seedling stand. A so-called rotary type planting mechanism 23 that reciprocates between the plane and the plane is provided.

The parallel link mechanism 14 is composed of one top link 24 and a pair of left and right lower links 25, 25, and the pair of lower links 25, 25 is a space truss composed of a vertical arm and a stay arranged on the upper side thereof. It is reinforced by a frame structure member such as, and is attached to the transmission case 16 via the hitch body 26 in the seedling planting device 13.

A pillar 27 standing upright from the front ends of the left and right planted transmission cases 19 and a pillar 27 'standing upright from the central transmission case 16.
On the other hand, a trochanter 28 is provided at each upper end of the seedling mounting table 22, while an upper rail 29 in the middle of the back surface of the seedling mounting table 22 is fitted to the trochanter 28 and a lower rail 30 is attached to the lower end of the seedling mounting table 22 for each planting. It is mounted on a slider (not shown) protruding from the attached transmission case, and is configured to be able to reciprocate left and right by a lateral feed shaft means described later.

Further, between the upper surfaces of the planted transmission cases 17 and 19, a seedling pick-up plate 31 having a right and left length is arranged in parallel with the lower rail 30, and a support plate 32 attached to the seedling pick-up plate 31 is provided in each planted transmission case. A seedling stand that is mounted on the side surfaces of 17, 19 so that it can slide up and down, and that the support plate 32 can be moved up and down via the operating rod 33 with a crank to move only laterally.
A rotary type planting mechanism that moves along the locus shown by the chain double-dashed line in FIG. 3 by adjusting the distance from the lower end of 22.
When the seedlings divided from the seedling take-out plate 31 at the lower end of the seedling mounting table 22 by 23 planting rods 23a plant seedlings in a field scene, the vertical amount of the seedling mat on the seedling mounting table 22 is adjusted.

From the PTO shaft projecting from the rear end of the power transmission case 10 through the expandable shaft 35, the input shaft 36 of the transmission case 16 to the bevel gears 37 and 38, and the center of the chain 39 via the chain sprocket 40 and chain. Power is transmitted to the transmission mechanism 41 in the planted transmission case 17 and to the transmission mechanisms 41 and 41 in the planted transmission cases 19 and 19 on both left and right sides via the transmission shafts 42 in the connecting pipes 18, respectively. A rotary type planting mechanism 23 mounted on both left and right sides of the transmission cases 17 and 19 is rotationally driven.

A transmission case that is arranged in parallel with the connecting pipe 18
The lateral feed shaft 43 disposed outside 16 has one end pivotally supported in the transmission case 16 so as to be rotated by the key body sliding type transmission device 44 in the transmission case 16, and the other end of the lateral feed shaft 43. Is pivotally supported by a plate-like support arm 45 projecting from the other end of the connecting pipe 18 or the base of the planted transmission case 19, and is provided with a boat-shaped key 47 that engages with a reciprocating screw groove 46 formed in the lateral feed shaft 43. To the slider 48, a triangular bracket 50 fixed to the lower rail 30 at the lower end of the rear surface of the seedling mounting table 22 is detachably connected via screws 51, etc., and synchronized with the rotation of the rotary type planting mechanism 23. Then, the seedling table 22 is horizontally fed back and forth.

The outer circumference of the lateral feed shaft 43, which projects from the side surface of the transmission case 16 and is exposed to the outside, is formed by the left and right side portions of the slider 48 and the transmission case.
It is configured to be covered with a stretchable bellows-type cover 52 made of rubber or the like, which is provided between the side surface of 16 and the side surface of the plate-like support arm 45. A recess is formed on the inner surface of the slider 48 so that the air in the cover bodies 52, 52 on the left and right sides can move through the space with the reciprocating screw groove 46 when the slider 48 moves laterally. is there.

Further, feed cams 54, 54 are provided at both left and right ends of a shaft 53 rotatably mounted on the transmission case 16 so that the shaft 5 can be moved in the transmission case 16.
The cam 56 attached to 3 is configured to reciprocally rotate by a certain angle by the rotation of the cam 57 at the end of the transverse feed shaft 43.
A vertical feed shaft 58 is rotatably supported on the lower part of the rear surface of the 22, and the vertical feed shaft 58 is provided with a driven cam 59 with a one-way rotation clutch that intermittently rotates this in one direction by one pitch. At the left and right ends of the horizontal feed, the one feed cam 54 abuts and presses the driven cam 59 to intermittently rotate the vertical feed shaft 58.

The vertical feed shaft 58 and the rotary shaft 60 arranged in parallel therewith are fitted with a vertical feed body 61, and the belts wound around the both shafts 58, 60 are rotated in synchronism with each other, whereby Vertical feed 61
The seedling mat on the seedling table 22 is vertically fed in the direction of the seedling take-out plate 31 at the lower end.

And, as shown in FIG. 5 and FIG. 7, the transmission 44, which is composed of a gear train for changing the lateral feed speed of the seedling mounting table 22, has three drive-side gears that engage with the drive-side shaft 39. 62a, 62b,
A row 62 of 62c and three driven gears 63a, 63 that are constantly meshed with the row 62
b, 63c, a key body 65 slidably fitted in a key groove 64 along the axis of a lateral feed shaft 43 that is a driven shaft on which each gear of the driven gear train 63 is rotatably fitted, and the key A shifter ring 66 for moving the body 65 along the axis of the lateral feed shaft 43, which is a driven shaft, and a key body.
A bent plate-shaped spring body 67 having a lower surface 65 attached thereto is formed.

An engaging portion 65a that engages with an engaging groove 63d formed in the inner diameter of each driven gear is integrally projectingly provided at the tip of the key body 65, and the base of the key body 65 is provided with a shifter ring 6a. A recess 65b is formed that is loosely fitted to the inner diameter portion so as to sandwich the front and rear end surfaces. On the other hand, the spring body 67 is located substantially along the lower surface of the key body 65.
It is arranged so as to extend from the base portion of 65 to the engaging portion 65a at the tip, the bent base portion 67a of the spring body 67 is sandwiched by the rear surface of the base portion of the key body 65, and the tip portion 67b of the spring body 67 serves as the lower surface of the key groove 64. In between, the engaging portion 65a of the key body 65 is biased outward in the radius of the lateral feed shaft 43.

The shifter ring 66 loosely fitted to the lateral feed shaft 43 has an annular groove 66 on the outer circumference.
Arm 68 that has a and can be operated from the outside of the transmission case 16
It is slidable along the horizontal axis of the horizontal feed shaft 43 in a state of being engaged with the key, and is also rotatably engaged with the key body 65 by the recess 65b.

Therefore, the arm 68 moves the key body 65 back and forth through the shifter ring 66 so that the engagement portion 65a of the key body 65 is moved to the driven gear train 63.
By selectively fitting in the inner diameter engagement groove 63d of any gear in, the rotational speed of the transverse feed shaft 43 is increased or decreased, and the lateral movement speed of the boat-shaped keyed slider 48 engaging with the reciprocating screw groove 46 is increased. Can be increased or decreased.

In addition, in the vicinity of the upper ends of the posts 27, 27 at the planting mechanisms 19, 19 on both the left and right sides, and the stay 70 protruding laterally from the transmission case 16.
The left and right ends of the column are connected by the reinforcing members 71, 71, whereby the reinforcing members 71, 71 are arranged in a substantially V shape in the front view and the plan view, and the upper ends of the columns 27, 27 are laterally oriented. Reduces bending. Further, although not shown, the central float 20 arranged on the lower surface of the central planted transmission case 17 is provided with means for detecting the height with the field scene, and the central float 20 and the floats 21 and 21 on the left and right sides are, The planting depth adjusting rod 72 is configured to adjust the planting depth of the seedling, and various operating levers such as the operating rod 33 for vertically adjusting the planting depth adjusting rod 72 and the seedling take-out plate 31. Is biased to one side with respect to the lateral center of the traveling body in the seedling planting device 13, and the lateral feed shaft 43 is biased to the above and the other so as to adjust the left and right weight balance of the whole seedling planting device 13. is there.

In this configuration, during rice planting work, the seedling mat is placed on the seedling placing table 22, while the seedling planting device 13 is moved downward by driving the hydraulic cylinder 15, and the floats 21, 20, 21 are grounded in the field. If you drive 3, 5, the machine will go straight, and by driving the seedling planting device 13, the seedling table 22 will be fed laterally.
From the above seedling mat, seedlings can be planted along a plurality of lines (6 lines in this embodiment) in the field while dividing each plant by the planting rod 23a.

Then, in order to increase or decrease the number of seedlings per share, the shifter ring 66 of the transmission 44 is moved back and forth from outside the transmission case 16 via the arm 68, and the engagement groove of the driven gear having a predetermined gear ratio is obtained. If the distal end engaging portion 65a of the key body 65 is positioned at 63d, the rotation speed of the lateral feed shaft 43, which is a driven shaft, is determined, and the boat key engaged with the reciprocating screw groove 46 of the lateral feed shaft 43. The lateral movement of the attached slider 48 and, consequently, the lateral feed speed of the seedling table 22 are changed.

Therefore, it is possible to change the lateral width of the seedling mat across the seedling take-out opening in the lower end seedling take-out plate 31 of the seedling placing table 22 to a predetermined value, and the number of seedlings per plant divided by each planting rod 23a in the planting mechanism 23. It can be changed.

In this case, since the shifter ring 66 is relatively rotatable with respect to the lateral feed shaft 43 that is the driven shaft and the key body 65 that rotates integrally with the lateral feed shaft 43, the key body 65 and the shifter ring 66 are laterally fed. Even if it is loosely fitted so as to be able to move integrally in the axial direction of 43, an unreasonable force does not act on the key body 65 itself in the direction perpendicular to that, and there is no risk of the key body 65 being damaged.

Further, since the shifter ring 66, the key body 65, and the spring body 67 are formed as separate bodies that are separable from each other, the manufacturing work is simple and the three assembling works are extremely simple.

According to the present invention, the gear train of the driven shaft is mounted so as to rotate integrally with the driven shaft, the gear train of the drive side is rotatably fitted to the drive shaft, and the key body is mounted on the drive shaft in the same manner as described above. Of course, a shifter ring may be provided and the spring body may be detachably attached to the key body.

Further, if it is configured such that the end of the lateral movement of the seedling placing table 22 is automatically shifted to the preselected gear, the seedling placing table 22 concerned
The timing with the mechanism for vertically feeding the seedling mat by a predetermined amount at the laterally moving end can be automatically set.

In the above-described embodiment, the driven shaft of the transmission 44 is also used as the lateral feed shaft 43, but the transmission 44 may be installed at another portion of the transmission case 16. Further, the transmission 44 is a seedling planting device.
Not only 13 but also can be used as a transmission for traveling.

[Brief description of drawings]

1 to 7 show an embodiment of the present invention, FIG. 1 is a side view of a rice transplanter, FIG. 2 is a plan view, and FIG. 3 is a view of FIG.
III-III line enlarged cross-sectional view, FIG. 4 is an enlarged side view of an essential part of FIG. 3, FIG. 5 is a V-V line cross-sectional view of FIG. 4, and FIG. 6 is VI-VI of FIG. FIG. 7 is a sectional view of the transmission, FIG. 8 is a sectional view of a conventional technique, and FIG. 9 is a sectional view of another conventional technique. 1 ... traveling body, 2 ... body frame, 3,5 ... wheels,
8 ... Engine, 13 ... Seedling planting device, 14 ... Parallel link mechanism, 15 ... Hydraulic cylinder, 16 ... Transmission case, 17 ... Central planting transmission case, 19 ... Planting transmission case, 18 ... … Connecting pipe, 41 …… Transmission mechanism, 22 …… Seedling table, 23 …… Planting mechanism, 31 …… Sprouting plate, 36 …… Input shaft, 43 …… Transverse shaft,
46 …… Reciprocating screw groove, 47 …… Ship-shaped key, 48 …… Slider, 50
...... Bracket, 52 …… Cover, 44 …… Transmission, 58…
… Vertical feed shaft, 62 …… Drive side gear train, 63 …… Driven side gear train, 64 …… Key groove, 65 …… Key body, 65b …… Concave, 66…
… Shifter ring, 67 …… Spring body, 68 …… Arm, 70 …… Stay, 71, 71 …… Reinforcing member, 72 …… Planting depth adjusting rod, 33…
… Operation rod.

Claims (1)

[Scope of utility model registration request] 1. A key body in a key groove along an axis of a shaft for rotatably supporting each gear in the one gear train, wherein corresponding gears of a drive-side gear train and a driven-side gear train mesh with each other. Is slidably inserted, and the key body selectively engages with an engagement groove of a gear inner diameter portion of the one gear train to shift gears. A spring body inserted between and is detachably mounted, and the key body is biased by the spring body toward the inner diameter groove portion of the one gear, while the key body is provided around the axis of the shaft. Form a recess that fits loosely into the inner diameter of the shifter ring that is rotatably fitted,
A key body sliding type transmission characterized in that a shifter ring is configured to be rotatable with respect to a key body.