JPS63199126A - Power transmission gear - Google Patents

Abstract

PURPOSE:To enable the simple assembly thereof by assembling all of divided cases, oil pumps, and oil motors on the mounting surface of a base. CONSTITUTION:A power transmission 13 includes an oil pump 27, two oil motors 29 and 29 driven by the oil pump 27, deceleration mechanisms 31 and 31 provided in a space between each oil motor 29 and a right and a left axle 21, a mission case 33 and the like, the right and left axles 21 and 21 are laid coaxially. Each of mission chambers 45 and 47 is formed by both cases 37 and 39, the right and left mission chamber 45 and 47 are communicated by a through hole formed on the base 35. Lubricating oil is sealed in the mission chamber, and oil pump 27, the oil motor 27 and 29, the deceleration mechanism 31, and the inner end section of the right and left axles 21 and 21 are housed in the mission chambers 45 and 47.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a power transmission device, and more particularly to a power transmission device configured using an oil pump, an oil motor, and the like.

(Prior Art) Various vehicles, such as lawn mowers and tillers, are equipped with power transmission devices that transmit engine power that has been decelerated and shifted to an appropriate speed ratio to left and right axles.

When the power transmission device is configured using an oil pump and an oil motor, the oil pump and the oil motor mainly perform speed change, and deceleration is performed by a deceleration mechanism consisting of a plurality of gears. Conventionally, in such a hydraulic power transmission device, the transmission case that houses the reduction mechanism, oil pump, and oil motor is constructed from two separate case bodies, and the oil pump and oil motor are installed at appropriate locations on the case separate body. I am trying to assemble it to.

(Problem to be Solved by the Invention) Therefore, in the conventional power transmission device, the case split body has at least two mounting surfaces: a mounting surface for the other case split body, and a mounting surface for the oil pump and oil motor. It has to be formed in different places, making processing complicated,
In addition, case split body, oil pump,
Since the oil motors were assembled individually, the assembly of the power transmission device was troublesome and difficult to achieve accuracy.

The present invention has been devised in view of the above-mentioned circumstances, and an object of the present invention is to provide a power transmission device that can be easily processed and assembled with high accuracy and easily.

(Means for Solving the Problems) In order to achieve the above object, the configuration of the present invention is such that the transmission case (33) has flat mounting surfaces (35A) on both sides.
, (35B) on which the substrate (35) is formed, and the substrate (35).
The two case division bodies (37) and (39) respectively assembled to the definition devices (35A) and (35B) of 5)
), an oil pump (27), and an oil motor (
29) on the mounting surface (35A) of the board (35), (
35B) and placed inside the mission case (33).

(Function) Case division bodies (37), (39), oil pump (27), and oil motor (29) are all mounted on the mounting surface (35A) of the board (35).

(35B), the power transmission device (13) can be assembled.

Therefore, the case division bodies (37) and (39) have the substrate (
It is only necessary to form the mounting surfaces (37A) and (39A) for the case parts (35) and the case division bodies (37) and (39) can be easily processed.

In addition, the mounting surface (35A) and (35B) of the board (35)
), oil pump (27), oil motor (
29), the case divided bodies (37) and (39) can be assembled in sequence, so the power transmission device (13) can be assembled easily and with high precision.

(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 power transmission device, and Figure 3 is a combination of the A-A line arrow view in Figure 2 and the B-B cross section. Figure 4 shows 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 power transmission device (13) is arranged between the left and right rear wheels (5).

The power of the engine is transmitted from the human power shaft (15) of the power transmission device (13).
) through the belt (17) and pulley (19),
A part of the engine power is transmitted to the left and right car i[1l (21), (21) via the power transmission device (13), and the left and right rear wheels (5).

(5), and part of the engine power is also supplied to the input shaft (
15), is transmitted to the lawn mowing cutter in the cutter housing (7) via the pulley (23) and belt (25), thereby rotating the cutter.

The power transmission device (13) includes an oil pump (27),
Two oil motors (29), (29) driven by the oil pump (27), and reduction mechanisms (31), (31) provided between each oil motor (29) and the left and right axles (21). and mission case (33)
The left and right axles (21) and (21) are arranged coaxially.

The mission case (33) has a substrate (35A) and (35B) formed on both left and right sides, respectively.
35), and the left and right mounting surfaces (35A) of the board (35),
The left and right cases (37) are fastened with bolts by abutting the mounting surfaces (37A) and (39A) on (35B) via the gaskets (36) and (38), respectively.

(39), and (41) in Figures 3 and 4.
(43) shows the bolt attachment parts of the left and right cases (37) and (39).

Both the cases (37) and (39) allow the board (35)
Mission chambers (45) and (47) are defined on the left and right sides, respectively, and the left and right mission chambers (45) and (47) are communicated through a through hole formed in the substrate (35). The transmission chambers (45), (47) are filled with lubricating oil, 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).

(47).

The human power 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 (
35A) to the mounting surface (57A) via the packing (56).
The pump case (57) is in contact and fastened with bolts, the drive @ (55) is inserted into the pump case (57) and rotated by engine power, and the drive shaft (55) is tilted with respect to the axis of the drive shaft (55). a swash plate (59) attached to 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 cylinder block (61). Built-in swash plate (59)
a plurality of pistons (65) that perform reciprocating motion by moving on a thrust bearing (63); a valve plate (71) on 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 any value by operating the speed change operator. Therefore, the oil pump (27
), and in the embodiment, it can be switched to three stages: forward, neutral, and reverse.

The left end of the drive @ (55) is supported by the bearing (77) of the left case (37), and the drive shaft (55) connects the bevel gear (79) attached near the left end with the 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). In the embodiment, a gear type oil pump (trochoid pump) (85) for supplying oil to the suction boat (67) of the oil pump (27) is provided in this portion.

The oil 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), and a discharge boat (93).
) etc.

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 (95
) and a cylinder block (103) that is spline engaged with the output shaft (95) and rotates integrally with the output shaft (95);
03) and the thrust bearing (1) of the swash plate (101).
05) A plurality of pistons (1
07), 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) to be assembled on 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 (29) to be installed on the right mounting surface (35B) of
Case (97B) is the gear type oil pump (85).
). The case (97B) is attached to the right mounting surface (35B) through the packing (114).
7C) and fasten with bolts to assemble. In FIGS. 3 and 4, (1(16) and (108) indicate the bolt attachment portions of the cases (978) and (97B).

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).
), (85), oil for the oil motor (29) is sealed, and an oil reservoir (119) bulging 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 inner part of the board (35), and the oil motor (29) that covers the gear type oil pump (85). ) case (97B) and the oil pump (2
7), (85), oil motor (29), (2
9) in the closed spaces (115) and (117).

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 the left case (37).
and the bearing (125) in the bearing part (123) of the right case (39).
), 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 (35) and (37), respectively. (135) and is supported via an oil seal (137).

The inner end surface (218) of each axle (21) has a bearing hole (129)
A rear wheel (5) is attached to the outer end of each axle (21).

A large-diameter reduction gear (139) that meshes with the reduction gear (127) is attached to a portion of each axle (21) near the cases (37), (39), and the reduction gear (127),
(139) constitutes a deceleration mechanism (31) that decelerates the power of the engine.

There is a car on the inner side of each of the reduction gears (139). l! [1
A brake mechanism (141) that performs braking of 1 (21) is provided.

The brake mechanism (141) includes a case (143) attached to a substrate (35), an anchor bin (145) supported by the case (143), and an anchor pin (145).
); and a cam (149) supported by the case (143) for expanding the brake shoe (147).
are joint (151), rod (153), joint (15)
5) It is connected to a brake operator via a rod (157), a lever (159), etc.

Next, the oil passages of the oil pump (27), (as) and oil motor (29) will be explained.

Suction boat (91) of the gear type oil pump (85)
The suction passage (181) that supplies oil to the oil reservoir (
119) is formed in the substrate (35), and a filter (163) is attached to the opening.

Discharge boat (93) of the gear type oil pump (85)
) is connected to the substrate (3).
5) is formed into a front branching passage (167) which extends upward at approximately the center in the front-rear direction and whose upper part extends forward, and a rear branching passage (169) which extends rearward, and a discharge passage (185). A relief valve (171) is provided inside.

On the other hand, between the inlet boats (109) and (109) of the left and right oil motors (29) and between the outlet boats (111) and (111), oil extends in the left and right direction, that is, in the thickness direction of the board (35). 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 oil passage (179) to the rear branch passage (1δ9)
are communicated with each other through check valves (181) and (183), respectively.

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

The drive shaft (55) rotates under the power of the engine (9), and a gear-type oil pump (85) first pumps oil through the suction passage (lfil), the discharge passage (185), and the front branch passage (16).
7) and is 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).
Oil is sucked in from the front oil passage (177), suction boat (67), discharge boat (69), rear oil passage (1°79), oil passage (173), and inlet boat (109) to the oil motor (29). supply And the oil motor (
The cylinder block (103) is rotated by reciprocating each piston (107) of the cylinder block (10
3) rotates the output shaft (95), the power of the engine is transmitted to the axle (21) via the reduction mechanism (31), and the oil is transferred to the outlet boat (111) and oil path (175).
), the oil reaches the front oil passage (177), and is circulated from the front oil passage (177) to the suction boat (67) of the oil pump (27).

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 remain closed, and the oil flows from the relief valve (171) to the oil reservoir ( 119). When going backwards, the swash plate (
59) is opposite to the inclination angle when moving forward, and the oil supplied from the oil pump (85) is supplied from the rear branch passage (169) and the rear oil passage (179), contrary to when moving forward. Suctioned into the discharge boat (69) of the pump (27),
Discharged from the suction boat (67), the front oil passage (177)
, is supplied from the oil path (175) to the outlet boat (111) of the oil motor (29). And the output shaft (9
5) in the opposite direction to the forward movement, and the oil flows through the inlet boat (109), oil passage (173), and rear oil passage (17).
9) 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 pump (85).

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), (29), when the lawn mower (1) changes direction, the left and right axles (21), ( 21) is given the rotation difference.

According to this embodiment, therefore, the left and right cases (37).

(39), oil pump (27), (a5), and oil motor (29) all on the mounting surface (35) of the board (35).
A), by assembling it to (35B), the power transmission device (
13) can be assembled.

Therefore, there is no need to form mounting surfaces for the oil pumps (27), (85) and oil motor (29) on the left and right cases (37), (39) as in the past, but simply for the mounting surfaces for the board (35). It is sufficient to form the mounting surfaces (37A) and (39^), and the left and right cases (37) and (39).
can be easily processed.

In addition, the mounting surface (35A) and (35B) of the board (35)
) as a reference, oil pump (27), (85), oil motor (29), left and right cases (37), (3
9) can be assembled in sequence, so the power transmission device (
13) can be assembled easily and with high precision.

In addition, oil pumps (27) and (8) are attached to the board (35).
5) Since the oil motor (29) is assembled, the power transmission device (13) can be constructed without using any oil pipes by forming an oil path on the board (35) as in the embodiment. .

In addition, although the case where a gear type oil pump (85) was used was explained in the example, a gear type oil pump (85) was used.
), oil pump (27), oil motor (2
9) may constitute the power transmission device (13).

In addition, in the embodiment, an axial piston pump was used as the oil pump (27), and an axial piston motor was used as the oil motor (29).
The type of is not limited to the one in the example, other types may be used, and oil pump (27), oil motor (
A variable capacitance type may be used for at least one of 29).

In addition, each output shaft (95) of two oil motors (29)
The left and right axles (21) may also be used, and in such a case, the oil pump (27) may be driven by the engine power extracted from the reduction mechanism (31).

Further, in the embodiment, a case has been described in which two oil motors (29) are provided corresponding to the left and right axles (21), but the left and right axles may be driven by one oil motor (29). .

(Effects of the Invention) As is clear from the above description, according to the present invention, it is possible to obtain a power transmission device that can be easily processed and assembled with high accuracy and easily.

[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 power transmission device, and Figure 3 is a combination of the A-A line arrow view in Figure 2 and the B-B cross section. Figure '4 is C of Figure 2.
- It is a figure which combined the C line arrow view view and the D-D line arrow view view. In the diagram, (1) is the riding lawn mower, (3) is the front wheel, and (5)
is the rear wheel, (11) is the handle, (13) is the power transmission device, (21) is the axle, (27), (85) are the oil pump, (29) is the oil motor, (31) is the reduction mechanism,
(33) is the mission case, (35) is the board, (35)
A), (35B) is the mounting surface, (37) is the left case,
(39) is the right case. Sen-Itohashi 7 cities Masaki (voluntary) 1. Indication of the case Japanese Patent Application No. 62-31129 2, Name of the invention Power transmission device 3, Relationship with the person making the amendment 1 Patent applicant (532) Honda Motor Co., Ltd. 4, Agent Azabudai, Minato-ku, Tokyo 2-4-5 106 Masonic 39 Mori Building 2nd Floor 6, Subject of amendment: Claims column and Detailed Description of the Invention column of the specification, Drawing 7, Contents of the amendment ■ Specification, page 2, line 11 The phrase "engine power" should be corrected to "power from a power source such as an engine or electric motor." - Correct the word "engine" on page 5, line 10 of the specification to read "The riding lawnmower is equipped with an engine as a power source." (3) In the drawings, correct Figure 2 as shown in the attached sheet. ``2. Claims: A power transmission device that transmits 1-power IQ power that is decelerated and changed to an appropriate speed ratio to the left and right axles, and a deceleration mechanism that decelerates 10,000 I9 power using a plurality of gears; an oil pump driven by the power of the audience 9; an oil motor driven by the oil pump; a transmission case accommodating the reduction mechanism, the oil pump, and the oil motor; at least one of the oil pump and the oil motor; is a variable capacity type. The mission case is composed of a board having flat mounting surfaces formed on both sides, and two case division bodies each assembled to the both claw devices of the board. An oil pump and an oil motor are assembled to the mounting surface of the board and arranged inside the transmission case.

Claims (1)

[Scope of Claims] A power transmission device that transmits engine power that has been decelerated and changed to an appropriate speed ratio to left and right axles, comprising a deceleration mechanism that decelerates the engine power using a plurality of gears, and oil that is driven by the engine power. A pump, an oil motor driven by the oil pump, and a transmission case housing the reduction mechanism, the oil pump, and the oil motor, and at least one of the oil pump and the oil motor is of a variable displacement type, The mission case is composed of a base plate having flat mounting surfaces on both sides thereof, and two case split bodies assembled to the two mounting faces of the base plate, and the oil pump and the oil motor are mounted on the base plate. A power transmission device characterized by being assembled to a mounting surface and disposed within a transmission case.