JPS63199128A - Hydraulic transmission - Google Patents

Abstract

PURPOSE:To make it possible to assemble easily by accommodating an oil pump and an oil motor in the left side inner case and an oil charge pump and an oil motor in the right side inner case, respectively. CONSTITUTION:This hydraulic transmission 13 furnishes an oil pump 27 and two oil motors 29, 29 driven by the oil pump 27, deceleration mechanisms 31, 31 arranged between the oil motors 29, 29 and the right side and the left side axles 21, 21, a mission case 33, and the like, and the right side and the left side axles 21, 21 are arranged coaxially. The right end of a driving shaft 55 is penetrated through a bearing hole 83 on a base plate 35, and projected to the right side fixing surface 35B of the base plate 35. Also, just at this position, a gear type oil pump is furnished as an oil change pump 85 to feed the oil to a suction port 57 of the oil pump 27.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a hydraulic transmission, and more specifically, it is comprised of a variable displacement oil pump, an oil charge pump, two oil motors, and two speed reduction mechanisms. The present invention relates to a hydraulic transmission device.

(Prior Art) Various vehicles, such as lawn mowers and tillers, are equipped with a transmission device that changes the power of a drive source such as an engine or electric motor to an appropriate speed ratio and transmits it to left and right axles.

Japanese Utility Model Application Publication No. 1988-19158 is known as a transmission device comprising a variable displacement oil pump, an oil charge pump, an oil motor, and a speed reduction mechanism.

In Japanese Utility Model Application Publication No. 61-19158, two mounting plates are provided, a case is attached to one mounting plate and a variable displacement oil pump and an oil motor are housed in the case, and an oil charge pump is mounted to the other mounting plate. a case is attached to the other mounting plate and the deceleration mechanism is accommodated in the case, and further,
The plate with both numbers is tightened and fixed.

(Problems to be solved by the invention) As a result, conventional transmissions are troublesome to assemble, and since the variable displacement oil pump and oil motor are housed in a single case, there is a risk of oil leakage. was there.

The present invention has been devised in view of the above circumstances, and an object of the present invention is to provide a hydraulic transmission that can be easily assembled and can suppress oil leakage as much as possible.

(Means for Solving the Problems) In order to achieve the above object, the configuration of the present invention includes a variable displacement oil pump (27) and a variable displacement oil pump (27).
7) two oil motors (29) driven by;
Two reduction mechanisms (31) that reduce the output from each oil motor (29), and an oil charge pump (29) that supplies oil to the oil path connecting the variable displacement oil pump (27) and the oil motor (29). A hydraulic transmission (13) consisting of a surface (35) mounted on both sides, respectively.
A) A substrate (35) on which surfaces (35A) and (35B) are formed is provided, and each mounting of the substrate (35) is performed on the surface (35A) and (35B).
Attach the inner cases (97^) and (97B) to the
Each mounting of the board (35) is on the surface (35A), (358)
Outer cases (37) and (39) are attached to the inner cases (97A) and (97B), respectively, and a variable displacement oil pump (27) and one of the inner cases (97A) are installed. an oil motor (29) is housed, an oil charge pump (85) and the other oil motor (29) are housed in the other inner case (97B),
A deceleration mechanism (31) is disposed in a space defined outside each of the inner cases (97A), (97B) and inside the outer cases (37), (39), respectively.

(Function) Based on the board (35), the oil pump (27), oil charge pump (85), oil motor (29), inner case (97A), (97B), outer case (37),
(39) can be assembled in sequence, making assembly easy.

In addition, the left inner case (97A) houses a variable displacement oil pump (27) and an oil motor (29), and the right inner case (97B) houses an oil charge pump (85) and an oil motor (29), respectively. , Furthermore, the outside of each left and right inner case (97A) and (97B) is attached to the outer case (37).
, (39), so the inner case (97)
A), (97B) Even if the oil runs out, the outer case (
37) and (39), oil leakage can be suppressed.

Furthermore, the sealing properties of the inner cases (97A) and (97B) are incomplete, and the outer cases (37) and (39)
For example, if the airtightness of the oil motor (
If the output shaft of 29) stalls, oil will leak out of the inner cases (97A) and (97B) and cause damage to each inner case (978).

(97B) can be prevented from rapidly increasing in pressure, and the durability of the oil pump (27), oil motor (29), etc. can be improved.

(Embodiment) A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

Figure 1 is a cutaway plan view of the main parts of a riding lawn mower, Figure 2 is a cross-sectional development view of the hydraulic transmission, and Figure 3 is a cross-sectional view taken along line B-B in the view taken along line A-A in Figure 2. The combined diagram, Figure 4, is C in Figure 2.
- A view combining the C-line arrow view and the D-D line arrow view is shown.

(1) is a riding lawnmower, (3) is a front wheel, (5) is a rear wheel, (
7) is a cutter housing, (9) is a seat, (11) is a handle, and a hydraulic transmission (13) is disposed between left and right rear wheels (5).

The power from power sources such as engines and electric motors is supplied by a hydraulic transmission (
13) on the input shaft (15), belt (17), pulley,
(19), and part of the power from the power source is transferred to the left and right axles (21), (2) via the hydraulic transmission (13).
1) to drive the left and right rear wheels (5), (5), and part of the power from the power source is transmitted from the human power shaft (15) to the pulley (23) and belt (25) to the cutter housing. The signal is transmitted to the lawn mowing cutter in (7) and drives the cutter to rotate.

The hydraulic transmission (13) includes an oil pump (27), two oil motors (29), (29) driven by the oil pump (27), each oil motor (29), and left and right axles ( 21) Reduction mechanism (31), (31) provided between and mission case (33)
The left and right axles (21) and (21) are arranged coaxially.

The mission case (33) has gaskets (36) on the flat left and right mounting surfaces (35A) and (35B) of the board (35), respectively.

Left outer case (37) fastened with bolts via (3B)
) and a right outer case (39), and in the embodiment, the mission case (33) has left and right outer cases (37), (39).
) and the outer peripheral part of the substrate (35),
In Figure 4, (41) and (43) are the left and right outer cases (3).
7), shows the bolt attachment part of (39).

The amphoteric cases (37) and (39) cause the substrate (35
Mission chambers (45) and (47) are defined on the left and right sides of the substrate (45) and (47), respectively, and the left and right mission chambers (45) and (47) are communicated through a through hole formed in the substrate (35). Lubricating oil is stored in the mission chambers (45) and (47), and the oil pump (27), oil motor (29), (
29), reduction mechanism (31), left and right axles (21),
The inner end of (21) is the mission chamber (45), (4
7).

The input shaft (15) includes a bracket (49) attached to the outer end of the left case (37), a bearing (51), and an oil seal (
53), and is arranged so as to extend in the vertical direction.

The oil pump (27) is mounted on the left mounting surface (35A) of the board (35) with its drive shaft (55) parallel to the axle (21).
), and in the example, a swash plate type variable displacement axial piston pump was used as the oil pump (27).

The oil pump (27) is mounted on the left mounting surface (
A pump case (57) is attached to the pump case (57) via a gasket (56) with bolts, a drive shaft (55) is inserted through the pump case (57) and rotated by the power of the drive source, and the drive shaft (55) is The pump case (57
), a cylinder block (61) that is spline-engaged with the drive shaft (55) and rotates together with the drive shaft (55), and a swash plate (59) that is installed in the cylinder block (61) and 59), a plurality of pistons (65) that perform reciprocating motion by moving on the thrust bearing (63), and a valve plate (71) in which a suction boat (67) and a discharge boat (69) are formed; In the figure, (68) indicates a bearing, and (70) indicates an oil seal.

The swash plate (59) is connected to a speed change operator via a shaft (73), a lever (75), etc., and is connected to a drive shaft (55) of the swash plate (59).
) can be set to an arbitrary value by operating a speed change operator, and in the embodiment, it can be switched to three stages: forward, neutral, and reverse.

The left end of the drive shaft (55) is supported by a bearing (77) of the left case (37), and the drive shaft (55) connects a bevel gear (79) mounted near the left end to a bevel gear (79) of the input shaft (15). 81) to drive.

The right end of the drive shaft (55) is connected to the bearing hole (8) of the substrate (35).
3) and protrude toward the right mounting surface (35B) of the board (35). A gear type oil pump (trochoid pump) was provided in this portion as an oil charge pump (85) that supplies oil to the suction boat (67) of the oil pump (27).

The oil charge pump (85) is an oil pump (2).
7) is arranged on the same axis as the oil charge pump (
85) includes a gear (87) that rotates integrally with the drive shaft (55), a case (89) that accommodates the gear (87), a suction boat (91), a discharge boat (93), and the like.

The left and right oil motors (29) have respective output shafts (95) on the left and right mounting surfaces (35A) and (35B) of the board (35).
is arranged coaxially in parallel with the axle (21), and in the embodiment, a swash plate type fixed displacement axial piston motor is used as the oil motor (29).

The oil motor (29) includes a motor case (97),
An output shaft (95) disposed in the motor case (97), a swash plate (101) provided in the motor case (97) at an angle with respect to the axis of the output shaft (95), and an output shaft (9
A cylinder block (103) that is spline engaged with the output shaft (95) and rotates integrally with the output shaft (95);
The thrust bearing (103) of the swash plate (101)
105) A plurality of pistons (
107), a valve plate (113) on which an inlet boat (109) and an outlet boat (111) are formed.

The case (97A) of the oil motor (29) attached to the left mounting surface (35A) of the board (35) is attached to the oil pump (
27) is formed integrally with the case (57), and the substrate (35)
Oil motor (2) to be installed on the right mounting surface (35B) of
9) Case (97B) is the charge pump (85)
Form it in a size that covers it. The case (97B) is attached to the right mounting surface (35B) with bolts through the packing (114), and (106) and (108) in Figures 3 and 4 are bolt attachments of the case (97A) and (97B). Show part.

The case (97A) and (97B) allow the board (3
Space parts (115) and (117) are defined on the left and right sides of the substrate (5), respectively, and the rain space parts (115) and (117) are connected to the substrate (
The oil pump (27) is connected to the space (115) and (117) through a through hole (not shown) formed in the space (115) and (117).
), oil charge pump (85), oil motor (2
9), and an oil reservoir (119) that bulges downward is formed at the bottom of the right case (97B).

Therefore, in the embodiment, the case (97A) is an integrated pump case (57) and motor case (97);
The case (97B) of the oil motor (29) that covers the charge pump (85) constitutes an inner case.

The inner end of each output shaft (95) is connected to the bearing hole (
121), and both inner end surfaces (95A) and (95A
) are brought into contact within the bearing hole (121), and (122
) indicates a bearing, and (124) indicates an oil seal.

In addition, the outer end of each output shaft (95) is connected to an inner case (37).
and the bearing (12) in the bearing part (123) of the right outer case (39).
5), and a small diameter reduction gear (127) is attached near the outer end of each output shaft (95).

The left and right axles (21) have their inner ends supported by bearing holes (121) of the base plate (35), and their inner ends are supported by bearings (131) of the left and right outer cases (37) and (3g), respectively. (135), supported via an oil seal (137). The inner end surface (21A) of each axle (21) has a bearing hole (12
9), and the outer end of each axle (21) is fitted with a rear wheel (5).
).

Outer cases (37), (39) of each axle (21)
A large-diameter reduction gear (139) that meshes with the reduction gear (127) is installed at the closer location, and the reduction gear (127)
, (139) constitutes a deceleration mechanism (31) that decelerates the power of the engine.

An axle (21) is provided on the inner side of each reduction gear (139).
A brake mechanism (141) is provided to perform braking.

The brake mechanism (141) includes a case (143) attached to a substrate (35), an anchor pin (145) supported by the case (143), and an anchor pin (14).
a brake shoe (147) supported by a case (143) and a cam (149) for expanding the brake shoe (147);
) is a joint (151), a rod (153), a joint (
155), a rod (157), a lever (159), etc., and are connected to a brake operator.

Next, oil pump (27), oil charge pump (8)
5) The oil path of the oil motor (29) will be explained.

The suction boat (91) of the oil charge pump (85)
The suction passage (161) that supplies oil to the oil reservoir (
119) is formed in the substrate (35), and a filter (163) is attached to the opening.

The discharge boat (93) of the oil charge pump (85)
) is connected to the substrate (3).
5) is formed into a front branching passage (187) which extends upward at approximately the center in the front-rear direction and whose upper part extends forward, and a rear branching passage (189) which extends rearward, and a discharge passage (185). A relief valve (171) is provided inside.

On the other hand, the space between the inlet boats (109) and (109) of the left and right oil motors (29) and the space between the outlet boats (111) and (111) extend in the left-right' direction, that is, in the thickness direction of the board (35). Oil road (173),
(175) to communicate with each other.

Further, the suction boat (67) of the oil pump (27) and the oil passage (175) are communicated through a front oil passage (177) formed vertically in front of the center of the base plate (35). ) of the discharge boat (69) and the oil passage (17
3) is formed in the vertical direction behind the center of the substrate (35) and then communicated through an oil passage (179).

Then, the upper part of the front oil passage (177) is connected to the front branch passage (16).
7), connect the upper part of the rear oilway (179) to the rear branch road (i69)
are communicated with each other through check valves (181) and (183), respectively.

Next, the operation of the hydraulic transmission (13) will be explained.

The drive shaft (55) rotates under the power of the power source, and first oil is pumped into the suction path (161) by the oil charge pump (85).
), the discharge passage (165), and the front branch passage (167) before being supplied to the front oil passage (177). When moving forward, each piston (65) reciprocates due to rotation of the cylinder block (61) due to rotation of the drive shaft (55), sucking oil from the front oil passage (177) and the suction bow (67).
Discharge boat (69), rear oil passage (179), oil passage (17)
3) Supplies oil to the motor (29) from the inlet port (109). Then, each piston (107) of the oil motor (29) is reciprocated to rotate the cylinder block (103), and the rotation of the cylinder block (103) rotates the output shaft (95). The power is transmitted to the axle (21) through the reduction mechanism (31), and the oil passes through the outlet port (111) and oil passage (175) to the front oil passage (177), and from the front oil passage (177) to the oil pump. (27) is circulated to the suction boat (67).

Gear shifting is performed by changing the inclination angle of the swash plate (59) of the oil pump (27), and when in neutral, the swash plate (59)
9) is parallel to the base plate (35), the piston (65) does not reciprocate, the check valves (181) and (183) both maintain a closed state, and the oil is discharged from the relief valve (171). 119).

When moving backward, the angle of inclination of the swash plate (59) is opposite to that when moving forward, and the oil supplied from the oil pump (85) flows through the rear branch path (169) and the rear oil path, contrary to when moving forward. (
179) to the oil pump (27) discharge boat (69)
), is discharged from the suction boat (67), and is sent from the front oil passage (177) and oil passage (175) to the oil motor (2
9) outlet bow)-(111). Then, the output shaft (95) is rotated in the opposite direction to the forward movement,
Oil is inlet bow) (109), oil passage (17
3) The oil is circulated from the rear oil passage (179) to the discharge boat (69) of the oil pump (27), and the oil is circulated during forward and reverse travel while being replenished with oil supplied by the oil charge pump (85). be exposed.

Also, since the oil flow from the oil pump (27) is the sum of the oil flows from the left and right oil motors (29) and (29), when the lawn mower (1) changes direction, the left and right axles (21) , (21) is given the rotation difference.

In the above, the oil pump (2) is based on the board (35).
7), oil charge pump (85), oil motor (
29), the inner cases (97A), (97B), and the outer cases (37), (39) can be assembled in sequence, so the transmission (13) can be assembled easily and with high precision.

In addition, the oil pump (27) is installed in the left inner case (97^).
) and oil motor (29) into the right inner case (97B).
) to the oil charge pump (85) and oil motor (
29) respectively, and each left and right inner case (97A
), (97B) to the outer case (37), (
39), so the inner case (97A),
Even if oil leaks from (97B), the outer case (37)
, (39) can suppress oil leakage.

Furthermore, if the sealing properties of the inner cases (97A) and (97B) are made incomplete and the sealing properties of the outer cases (37) and (39) are made perfect, for example, the oil motor (2
When the output shaft (95) of 9) stalls, oil leaks out of the inner cases (97A), (97B) and prevents a sudden rise in pressure inside each inner case (978), (97B). This improves the durability of the oil pump (27), oil motor (29), etc.

In addition, in the embodiment, the oil pump (27) and the oil charge pump (85) are arranged on the same axis, so they can be driven easily!
l! By sharing the dl (55), etc., the structure can be simplified and the number of parts can be reduced.

In addition, in the embodiment, an oil pump (27) is mounted on the substrate (35).
, the charge pump (85), and the oil motor (29), the hydraulic transmission (13) can be configured without using any oil pipes, and the structure of the device can be simplified.

In addition, oil pump (27), oil charge pump (8)
5) The type of oil motor (29) is not limited to that of the embodiment, and other types may be used.

(Effects of the Invention) As is clear from the above description, according to the present invention, it is possible to obtain a hydraulic transmission that can be easily assembled and can suppress oil leakage as much as possible.

[Brief explanation of the drawing]

Figure 1 is a cutaway plan view of the main parts of a riding lawn mower, Figure 2 is a cross-sectional development view of the hydraulic transmission, and Figure 3 is a cross-sectional view taken along line B-B in the view taken along line A-A in Figure 2. The combined diagram, Figure 4, is C in Figure 2.
- It is a figure which combined the C line arrow view view and the D-D line arrow view view. In the figure, (1) is a riding lawn mower, (3) is a front wheel, (5) is a rear wheel, (11) is a handle, (13) is a hydraulic transmission, (21) is an axle, and (27) is a Oil pump, (85)
is the oil charge pump, (29) is the oil motor, (
31) is the reduction mechanism, (33) is the transmission case, (3
5) is the board, (37) and (39) are the outer case, (9
7A) and (97B) are inner cases. Patent applicant: Agent for Honda Motor Co., Ltd.
Patent Attorney Part 2 1) Part 1 Patent Attorney
Kuni Ohashi Production volume Patent attorney Small
Yama Yuyuki Patent Attorney No 1)
Shigeru"r'-A Sale 13 tIi Written (self-motivated) 1986 101 No. 21 D Special 1; 1 Agency Commissioner Kunito Ogawa ■, 1% display
02. ), 4 yen request) 1 Mayu 62-161480 No. 2, Name of the invention Hydraulic transmission 3, Relationship to the JII case Patent applicant (532) Kifil Giken Ohgyo Co., Ltd. 4, Agent 6. Draw 1 [object lJ'l Shoulder II +1g Detailed explanation column 1,
7...-,. Add the following sentence next to "Can be suppressed." on page 17, line 16 of the specification.

Claims (2)

[Claims] (1) A variable displacement oil pump, two oil motors driven by the variable displacement oil pump, two reduction mechanisms that reduce the output from each oil motor, and a link between the variable displacement oil pump and the oil motor. This is a hydraulic transmission device consisting of an oil charge pump that supplies oil to the oil passage connecting the and an outer case is attached to each mounting surface of the board to cover the inner case, a variable displacement oil pump and one oil motor are housed in the one inner case, and a variable displacement oil pump and one oil motor are housed in the other inner case. A hydraulic transmission device containing an oil charge pump and the other oil motor, and further comprising a reduction mechanism disposed in a space defined outside each of the inner cases and inside the outer case. (2) The hydraulic transmission according to claim 1, wherein the variable displacement oil pump and the oil charge pump are disposed on the same axis.