JPH06229377A - Rotary pump - Google Patents

Abstract

PURPOSE:To obviate the need to prime the pump each time when it is used by forming an inlet passage and an output passage at the height higher than a priming inlet in a pump casing so that the water in the pump casing does not run out even a hose connecting the inlet passage and the outlet passage to each other is removed. CONSTITUTION:A priming inlet 3 is provided at the upper part in a pump casing 2, and an inlet opening 4 and an outlet opening 5 are provided respectively lower than the priming inlet. An inlet passage 6 and an outlet passage 7 connected to the inlet opening 4 and the outlet opening 5 respectively are formed at the height higher than the priming inlet 3 in the pump casing 2. Thus, water does not run out from a pump chamber at the time when the pump is not used. Since the inlet passage 6 and the outlet passage 7 are formed in the pump casing 2, they can be formed without using any part from the inlet opening 4 and the outlet opening 5 up to the height above the priming inlet 3 and easily, even when elbows and pipes are not provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary pump used for, for example, car washing of agricultural working machines.

[0002]

2. Description of the Related Art For example, in a rotary cultivator mounted on a tractor, a rotary pump that rotates by receiving power from the gear case is attached to the rear part of the gear case, and the suction port side of this rotary pump is connected to water. A hose is connected to the outlet side, and the hose is used to wash the rotary cultivator.

In this rotary pump, a drive shaft and a motion shaft are arranged vertically, and a suction port and a discharge port are provided at approximately the center of the pump casing in the vertical direction, and a priming port that also serves as a drain is provided at the upper part. .

[0004]

The above-mentioned rotary pump of the prior art is occasionally used, and when the suction port and the discharge port are located below the priming inlet, the hose is removed and the inside of the pump casing is removed. It is very troublesome because it is necessary to inject priming water every time it is used, because the water in the room is lost.

In order to solve this problem, elbows are attached to the suction port and the discharge port, pipes forming the suction passage and the discharge passage are connected to the elbow, and this pipe is brought to a position higher than the priming water inlet. Can be configured as
Such a construction requires elbows and pipes, resulting in high cost. It is an object of the present invention to provide a rotary pump capable of solving all of the above problems by forming the suction passage and the discharge passage in the pump casing to a height higher than the priming water inlet.

[0006]

As a concrete means for solving the problem in the present invention, a priming inlet 3 is provided in an upper part of a pump casing 2, and a suction port 4 and a discharge port 5 are provided below the priming inlet 3.
In the rotary pump having each of the above, the suction passage 6 and the discharge passage 7, which communicate with the suction port 4 and the discharge port 5, respectively, are formed in the pump casing 2 to a height equal to or higher than the priming water inlet 3.

[0007]

The suction passage 6 and the discharge passage 7, which communicate with the suction inlet 4 and the discharge outlet 5, respectively, are formed to a height above the priming inlet 3 above the suction inlet 4 and the discharge outlet 5, so that they are not used. No water will escape from the pump room. Since the suction passage 6 and the discharge passage 7 are formed in the pump casing 2, the suction port 4 can be provided without providing an elbow and a pipe.
Also, it can be easily formed from the discharge port 5 to a height higher than the priming water injection port 3 without using any parts.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 6, reference numeral 11 denotes a side-drive type rotary tiller, which is mounted behind a tractor via a three-point link mechanism, and a rotary machine frame 12 is provided with a cover device 14 for covering the tiller section 13. .

The rotary machine frame 12 projects a support arm 16 to the left and right from a gear case 15 located substantially at the center in the left-right direction (width direction), and the transmission case 1 is attached to the left support arm 16.
7, the right support arm 16 is attached with the side frames 18, and the top masts 19 are bolted to the upper left and right of the gear case 15. Between the lower ends of the transmission case 17 and the side frame 18, a plurality of plowing claws 2 are provided.
A pawl shaft 21 having 0 is supported rotatably around the horizontal axis and forms a tilling part 13. The power for driving the pawl shaft 21 is transmitted from the PTO shaft of the tractor to the input shaft 22 of the gear case 15 via the universal joint shaft.
2 is transmitted to the pawl shaft 21 via the gear transmission mechanism 23 in the gear case 15 and the chain transmission means in the transmission case 17.

Reference numeral 26 is a support frame pivotally connected to the support arm 16. Rear gauge wheels are attached to the left and right sides of the rear end of the support frame 16. Between the top mast 19 and the support frame 26,
Height adjusting means 27 for adjusting the height of the rear gauge wheel to adjust the working depth is provided. The cover device 14 for covering the cultivating part 13 includes an upper cover 28 covering the upper part of the cultivating part 13, a rear cover 29 pivotally supported by a rear end of the upper cover 28 to cover the rear part of the cultivating part 13, and left and right side covers. The upper cover 28 is provided so as to be rotatable with respect to the rotary machine frame 12 about the claw shaft 21, and is movable in an arc in the circumferential direction of the tiller 13 via the drive mechanism 30. There is.

The gear case 15 has flanges 16A at the ends of the left and right support arms 16 bolted to both sides of a case body 33 made of aluminum alloy, and the gear transmission mechanism 23 is housed therein. The input shaft 22 has a pinion 34 integrally formed at a rear end thereof. A front shaft case 35 that supports the input shaft 22 through a bearing is inserted into a front inlay 33A of a case body 33 and fixed by a bolt. There is.

A bevel gear 36 meshes with the pinion 34. The bevel gear 36 is supported by the case body 33 via a bearing, and the shaft 37 is fitted into the shaft center of the case body 33 via a bush. The transmission shaft 24 is connected to the shaft 37 via a connecting cylinder 38. A clutch body 39 is spline-fitted in the shaft 37 so as to be slidable in the axial direction. Clutch teeth 40 are formed on surfaces of the clutch body 39 and the bevel gear 36 that face each other. It meshes by sliding and transmits the rotation of the bevel gear 36 to the shaft 37. The rotation of the shaft 37 is transmitted to the transmission shaft 24 via the connecting cylinder 38, and can be transmitted from the transmission shaft 24 to the chain transmission means in the transmission case 17.

Reference numeral 41 denotes a shifter that slides the clutch body 39 in the axial direction, and is operated by swinging from the outside of the case body 33 by a shifter shaft 42. A rear spigot 33B is formed at the rear of the case body 33, and a rear shaft case 43 is inserted and fixed to the rear spigot 33B.
A take-up shaft 44 is supported by the. The take-up shaft 44 is located concentrically with the input shaft 22, and a rear bevel gear 45, which meshes with the bevel gear 36, is provided at its front end so as to be relatively rotatable.
After this, the bevel gear 45 is also supported by the case body 33 via a bearing.

A clutch body 47 is spline-fitted to the moving shaft 44, and the clutch body 47 and the rear bevel gear 45 are attached.
Clutch teeth 48 that mesh with each other are formed in the rear and the rear bevel gear
The rotation of 5 can be transmitted to the moving shaft 44. Reference numeral 49 denotes a shifter that slides the clutch body 47 in the axial direction, which is attached to the shift lever 50. The shifter lever 50 projects rearward from the rear shaft case 43 and is bent laterally to allow the shift lever 50 to move. By moving back and forth, the power transmitted from the rear bevel gear 45 to the drive shaft 44 is connected and disconnected.

Reference numeral 1 denotes a gear type rotary pump mounted on the rear surface of the rear shaft case 43, and a mounting pin 54 fixed to the pump casing 2 is inserted into a hole 55 of the rear shaft case 43 to pass through the retaining pin. Installed. A lid 59 is attached to the pump casing 2, the pump chamber 8 is formed in the lid 59, and a gear portion 56A formed on the drive shaft 56.
The gear portion 57A formed on the sliding shaft 57 meshes with the gear portion 57A.

The drive shaft 56 is a cylinder shaft, and a female spline 56B is formed inside the drive shaft 56 and is fitted to the moving shaft 44. The traveling shaft 57 is located directly above the drive shaft 56 and in parallel therewith. By using the drive shaft 56 as a cylindrical shaft, a shaft coupling is unnecessary for connection with the moving shaft 44, the rotary pump can be arranged close to the gear case 15, and the shaft strength can be increased. Reference numeral 61 is an inner plug for preventing water leakage provided in the drive shaft 56.

The pump casing 2 is provided with a priming water injection port 3 which also serves as a drain in the upper part thereof and is plugged with a plug 58, and an intake port 4 facing the pump chamber 8 is formed substantially in the center below the priming water injection port 3. The discharge port 5 is formed to face each other.
In addition, the suction port 4 and the discharge port 5 are provided in the pump casing 2.
A suction passage 6 and a discharge passage 7 which are respectively connected to
The suction passage 6 and the discharge passage 7 are extended to a height higher than the priming water inlet 3.

The pump casing 2 is made of aluminum alloy or casting, and the suction passage 6 and the discharge passage 7 are casting holes.
It is integrally molded at the time of casting. However, the pump casing 2 may be formed by drilling after molding. Since the suction passage 6 and the discharge passage 7 extend from the suction inlet 4 and the discharge outlet 5 to the upper portion of the pump casing 2 and are parallel to each other,
The vertical and horizontal lengths of the pump casing 2 are not made too long. The upper ends of the suction passage 6 and the discharge passage 7 are directed rearward (or left and right outward), the hose 60 connected to, for example, a faucet of the water supply is connected to the suction passage 6, and the car wash hose is connected to the discharge passage 7. To be done.

In the gear case 15, the front spigot 33A and the rear spigot 33B of the case body 33 are formed to have the same diameter, and the front shaft case 35 has the rear spigot 33B.
Further, the rear shaft case 43 can be attached to the front spigot 33A. For example, it is useful when the rotary cultivator 11 is mounted on the front part of the tractor and power is taken from the front PTO shaft.

Further, it is possible to turn the rotary machine frame 12 left and right and place the transmission case 17 located on the left side on the right side while keeping the front and rear relationship of the input shaft 22 and the take-up shaft 44. Become. For example, it is useful for multi-working on a cigarette that requires the transmission case 17 to be arranged on the right side. In FIG. 6, the case body 33 of the gear case 15 and the flanges 16A of the left and right support arms 16 are fastened together by bolts 63 that penetrate the three members.
The through hole 64 of the case body 33 through which the 3 is inserted is formed by casting, and knock collars 65 are embedded at both ends.

In the case of a cast hole, since there is a draft and there is a large gap with the inserted bolt, rattling is likely to occur, but by using the knock collar 65, rattling can be eliminated. , And knock color 6
Since the hole for embedding 5 can be formed by casting, hole processing is also unnecessary. The knock collar 65 has two through holes 64
It should be installed in.

When the rotary pump is not used and is not mounted, the clutch body 4 is moved through the shift lever 50.
7 may be disengaged from the rear bevel gear 45 to cut off the power transmission. Further, when the power take-out by the moving shaft 44 is completely unnecessary, the rear shaft case 43 is removed and the lid shown in FIG. 67 may be attached to the case body 33.

FIG. 8 shows an example of the sealing structure of the inclined pawl shaft portion of a center drive type rotary cultivator, in which a pawl shaft 21 having the cultivating pawl 20 attached to a drive shaft 71 supported by a transmission case 70 is fixed. The inclined claw shaft 73 fixed to the transmission case 70 supports the inclined claw shaft 73 via a bearing, and the drive gear 74 fixed to the drive shaft 71 meshes with the internal gear 75 fixed to the inclined claw shaft 73. .

A bending / extending seal 76 is provided between the outer periphery of the cylindrical portion 74A of the drive gear 74 and the inner periphery of the outer end of the inclined pawl shaft 73.
An annular protective cover 77 is provided on the outer surface side of the bending / extending seal 76, and the inner periphery of the protective cover 77 is close to the outer periphery of the cylindrical portion 74A of the drive gear 74 with a small gap. The outer diameter of the tubular portion 74A of the drive gear 74 is smaller than that of the pawl shaft 21, and a chamfer 78 is formed so that the end portion of the pawl shaft 21 on the tubular portion 74A side has substantially the same diameter as the outer periphery of the tubular portion 74A.

Since the bending / expanding seal 76 is arranged close to the internal gear 75 and has a short distance from the internal gear 75, even if the inclined claw shaft 73 tilts with respect to the drive shaft 71, the bending / expansion seal 76. The bending and stretching movements of the pump, i.e.
Further, since the gap between the inner periphery of the protective cover 77 and the outer periphery of the cylindrical portion 74A is made small, the infiltration of mud into the gear portion is reduced, the chamfer 78 is formed on the pawl shaft 21, and the cylindrical portion 74A has a small diameter. As a result, the amount of mud and grass entering the protective cover 77 can be reduced.

The present invention is not limited to the above embodiment, but can be variously modified. For example, the rotary pump 1 may be a vane pump, the working machine on which the rotary pump 1 is mounted may be a center drive type rotary tiller or other type, and the shifter 49 may be configured to swing via a shifter shaft.

[0027]

According to the present invention described in detail above, the suction port 4
And a suction passage 6 and a discharge passage 7 which communicate with the discharge port 5 respectively.
The pump casing 2 up to a height higher than the priming water inlet 3
Since it is formed inside, even if the hose connected to the suction passage 6 and the discharge passage 7 is removed, the water in the pump casing 2 does not drain, priming water injection is not necessary every time it is used, and parts are attached. The suction passage 6 and the discharge passage 7 can be formed without the need for cost reduction.

[Brief description of drawings]

FIG. 1 is a sectional rear view showing an embodiment of the present invention.

FIG. 2 is a side view of the same section.

FIG. 3 is a plan view of the same section.

FIG. 4 is a sectional side view showing the entire rotary cultivator.

FIG. 5 is a rear view showing the entire rotary tiller.

6 is a cross-sectional view taken along line XX of FIG.

FIG. 7 is a cross-sectional view showing a cover of a gear case.

FIG. 8 is a cross-sectional view showing an example of a sealing structure for an inclined pawl shaft portion.

[Explanation of symbols]

 1 rotary pump 2 pump casing 3 priming water inlet 4 suction port 5 discharge port 6 suction passage 7 discharge passage 8 pump chamber 11 rotary tiller 15 gear case 23 gear transmission mechanism

Front page continuation (72) Inventor Hisakatsu Yasumiya 64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubota Sakai Factory Co., Ltd. (72) Inventor Takuya Matsuda 64 Ishizukitamachi, Sakai City Osaka Prefecture Kubota Sakai Factory Co., Ltd.

Claims (1)

[Claims] 1. A rotary pump having a priming inlet (3) at an upper part of a pump casing (2) and an inlet (4) and an outlet (5) below the priming inlet (4) and the outlet (4). A rotary pump characterized in that an intake passage (6) and a discharge passage (7) respectively communicating with the outlet (5) are formed in the pump casing (2) to a height higher than the priming water inlet (3).