JPH0231027A - Static liquid pressure coupling type power transmission device - Google Patents

Abstract

PURPOSE:To prevent the leakage of operation oil between a throttle valve and a gear engaging part by linking and connecting the throttle valve to an external manipulation mechanism which drives the valve in the throttling direction or in the valve opening direction and locks up the input/output shaft on condition that a static liquid pressure is locked. CONSTITUTION:By rotating an operation lever 45 in the right side to slide a clutch body 41 on an output shaft 15 in the left side, a sliding rod 33 is moved in the same direction following the movement of the clutch body 41, pushing a spring shoe 35, and the pushing force of a spring 36 is increased thereby, the clearance between a valve seat hole 23 and a valve body 34 is reduced, and the pressure in an exit passage 20 is increased. As a result, the pressure in a valve insertion hole 33 is increased, making the valve body 34 moved until it is balanced to the force of the spring 36. Since the throttle valve 34 provided at the exhaust side of a gear engaging part 18 is arranged at the exhaust part of an input shaft 4, an output shaft 15, or the like in such a way, it is not necessary to combine the throttle valve 34 and the gear engaging part 18 with a swivel joint in a conventional way, and the oil leakage between the both members can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a hydrostatic coupling type power transmission device.

Conventional technology A gear pump second joint is provided between the input shaft and the output shaft, and one of the output shafts is connected to the pump housing side, and the gear at the center of the pump housing is connected to the other, passing through the gear meshing part. A so-called hydrostatic joint type power transmission device in which the rotation speed of the output shaft can be arbitrarily changed by changing the amount of oil applied to the output shaft is conventionally known. In this case, in order to control the amount of oil passing through the gear meshing part, a throttle valve is provided on the discharge side of the gear meshing part, and by operating this throttle valve, the rotation speed on the output shaft side is adjusted. 0 For example, JP-A-54-13869 and JP-A-54-13869
No. 9-17290 describes such a device. In all of these conventional inventions, the throttle valve is mounted on a fixed part outside the input/output shaft.

In addition, in this type of power transmission device, it is naturally necessary to lubricate the rotating and sliding parts, and in this case, it is advantageous to use the oil supplied to the gear meshing part for that lubrication. In order to provide such lubrication, there is a method of supplying the oil to the sliding parts using a dedicated lubrication pump, or by splashing up the hydraulic oil in the oil pan using a protrusion provided on the rotating part. It is considered.

Problems to be Solved by the Invention In the above-mentioned conventional structure, when the throttle valve provided on the discharge side of the meshing part is completely opened to release the amount of oil passing through the meshing part, the output shaft side becomes low speed and vice versa. If the throttle valve is completely throttled to completely cut off the amount of oil in the meshing portion, the rotation speeds of the input shaft and output shaft will be approximately the same. In such a state, an extremely high pressure exists between the throttle valve and the gear meshing portion. At that time, if this throttle valve is installed on a fixed part as described above, it is necessary to connect the throttle valve and the gear meshing part via a swivel joint, and the above-mentioned When the pressure is high, the torque loss at this swivel joint increases, oil leakage also increases, and the input shaft side and output shaft side cannot be rotated completely synchronously. However, there was a drawback that the capacity of the pump section had to be very large.

In addition, as mentioned above, in the past, lubricating oil to rotating and sliding parts was supplied by a special lubricating oil pump or by splashing, but the former method resulted in higher costs. On the other hand, if the splashing type is lubricated, there is a risk of running out of lubricating oil.

Therefore, it is preferable that the lubricating oil to the rotating sliding parts is directed to the gear meshing parts, especially the hydraulic oil after passing through the throttle valve to eliminate oil leakage as described above. However, in this case, if the throttle valve is completely closed as described above, hydraulic oil will not be supplied, so it is necessary to ensure the supply of lubricating oil to the rotating and sliding parts even in such a situation. becomes.

This invention was made in view of the above-mentioned conventional circumstances,
In order to eliminate the leakage of hydraulic oil between the throttle valve and the gear meshing part, and to supply the hydraulic oil that has passed through the throttle valve to the rotating sliding parts as lubricating oil, there is a case where the throttle valve is completely closed. The present invention provides a hydrostatic joint type power transmission device in which lubricating oil is supplied to the rotating and sliding portion of the power transmission device.

Means for Solving the Problems And in order to achieve the above object, in the first invention of this application, a meshing portion between the input shaft side gear and the output shaft side gear is provided between the input shaft and the output shaft. In a power transmission device equipped with a hydrostatic joint that changes the rotation of the output shaft according to the amount of oil passing through the meshing part, a throttle valve that changes the amount of oil passing through the meshing part is installed on either the input shaft or the output shaft side. An external operation that is disposed within one of the rotating parts, drives the throttle valve in the throttle valve's throttle direction or valve opening direction, and locks up the input shaft and output shaft with the hydrostatic pressure joint locked. It is characterized by being interlocked and connected to a mechanism.

Further, according to the second invention of this application, the rotational speed of the input shaft is adjusted according to the amount of oil passing through the meshing portion between the input shaft side gear and the output shaft side gear between the input shaft and the output shaft. In a power transmission device equipped with a hydrostatic joint in which the rotational speed is changed, a lubricating oil reservoir is provided above the rotary fixed portion of the input shaft or the output shaft and communicates with the rotary sliding portion, and the gear engaging portion The hydraulic oil passing through the lubricating oil reservoir is guided to the lubricating oil reservoir.

According to the first aspect of the invention, the throttle valve and the gear meshing portion communicate with each other through the input shaft or the output shaft provided with the throttle valve, that is, without using a swivel joint. .

Further, according to the second aspect of the invention, even when the throttle valve is completely throttled, the oil in the lubricating oil reservoir is supplied to the rotating sliding portion side, so that there is no shortage of lubricating oil.

Embodiment Next, an embodiment of the present invention will be described based on the drawings.
In the figure, (1) is a box-shaped hydraulic oil case, and the bottom of this hydraulic oil case (1) is an oil pan (2) where hydraulic oil is always stored. A bearing housing (3) is fitted into an opening formed in the side wall on the left side of the figure and is fixed thereto.The input shaft (4) passes through this bearing housing (3) and is rotatable. installed. The input shaft (4) is rotatable at its outer end via a bearing (5), but the inner end has a structure that allows it to slide against each other to make it oil-tight. It is said that The hydraulic oil suction pipe (7) is inserted and attached to the radial oil inlet (6) formed in the bearing housing (3), and the strainer (8) at the lower end of the hydraulic oil suction pipe (7) is connected to the oil pan ( 2
) is immersed in the

The flange (9) formed at the inner end of the human power shaft (4) has
A pump housing (10) is integrally fixed within the hydraulic oil case (1).

(11) is a housing lid attached to the rear surface side of the pump housing (10), and the same input shaft (4) is located inside the chamber surrounded by the housing (10) and the housing lid (11). An output shaft gear (12) is rotatably supported on the shaft center, and a plurality of input shaft gears (13) meshing with the output shaft gear are arranged around the output shaft gear (12). ) is pivoted. A box-shaped lever case (14) is attached to the rear side of the hydraulic oil case (1), and the output shaft (1) is rotatably inserted into this lever case (14) from the rear side.
The inner end (15a) of 5) is connected to the output shaft side gear (12).
It is connected to the shaft portion of the shaft via a spline (16).

In addition, the outer peripheral part (1
5b) is connected to the housing M (11) via the bearing (61).
). As a result, when a flexible joint is connected to the output shaft (15), for example, an external force is applied directly to the shaft core of the hydrostatic joint, but due to the presence of the bearing (61), this external force is transferred to the housing lid (11). The output shaft side gear (12) and spline (16) of the hydrostatic pressure joint are protected from the external force.

In order to supply the hydraulic oil entered from the bearing housing (3) to the gear meshing part (1), an axial inlet passage (19) is formed in the input shaft (4). Furthermore,
In order to discharge the oil that has passed through the gear meshing portion (18) to the outside, an outlet passage (20) is formed parallel to the inlet passage (19) in the axial direction of the input shaft (4). On the other hand, the input shaft (4) is formed with a through hole (21) that penetrates in the diametrical direction on the outside of the bearing (5), and the through hole (21) and the outlet passage (20) are also connected to each other. Enlarged passage (22) provided at the center of the input shaft (4)
and the valve seat hole (23). It communicates with the through hole (21) of this input shaft (4),
A lid (25) is attached to the outside of the shaft coupling housing (24) attached to the outside of the hydraulic oil case (1), and a radial communication passage (26) is formed inside the lid (25). Furthermore, from the outer end of this communication passageway (26),
Hydraulic oil is discharged toward the hydraulic oil case (1) through an axial outlet hole (27) formed in the inner periphery of the shaft joint housing (24) and the bearing housing (3). And inside this hydraulic oil case (1),
A lubricating oil reservoir (30) is provided on the outer periphery of the bearing housing (3) and directly above the sliding portion (29) of the input shaft (4).
is formed. The bottom of this lubricating oil reservoir (30) is
It is connected to the rotary sliding part (29) and the input shaft bearing (5) through the drilled holes (31) (31). That is, the hydraulic oil that has passed through the gear meshing part (18) is transferred to the rotating sliding part (29) and the bearing (5) through the outlet passage (20), the through hole (21), and the communication passage (26).
), through the outlet hole (27) to its lubricating oil reservoir (30
). The oil overflowing from this lubricating oil reservoir (30) flows down to the oil pan (2) below, and
The structure is such that the lubricating oil is supplied from the lubricating oil reservoir (30) to the rotating sliding part (29) and the bearing (5) through the drilled hole (31).

The blind lid (3a) can also be removed by opening the mounting hole (3b) of the blind lid shown by the reference numeral (3a) below the oil level in the oil pan (2). In this case, the amount of lubricating oil flowing out from the mounting hole (3b) and the amount of lubricating oil flowing out from the oil pan (2
) If the lubricating oil flow resistance is appropriately set so that the ratio to the amount of lubricating oil overflowing to the Axis (4)
The rotation of the outer periphery prevents the oil from falling onto the oil surface of the oil pan (2) in the form of bubbles.
) is also captured by the strainer (8) in the oil pan (2) and is not re-inhaled into the inlet passage (19).

In this case, if the outlet hole (27) shown in FIG. Axis (15)
When the unit rotates, lubricating oil stops flowing out from the valve seat hole (23), but the amount of lubricating oil below the oil level W in the lubricating oil reservoir (30) remains, and the rotating part of the input shaft (4) and bearing (
5), and will not cause damage such as seizure.

Next, the shaft center of the input shaft (4) has a social entrance passageway (20
) communicates with the valve insertion hole (33a) through the small hole (33a).
) is formed. Inside this valve insertion hole (33) is a valve body (34) with its tip facing the valve seat hole (23).
) is slidably installed inside. The outer diameter d of the circumferential portion of this valve body (34) on the valve seat hole (23) side is the same as that of the small hole (33a).
It is formed slightly smaller than the diameter of the side sliding part. Also, the inner end of this valve body (34) and the valve insertion hole (33)
) A spring (36) is provided between the spring holder (35) and a spring receiver (35) housed inside.

Further, a sliding rod (38) passing through the shaft center is slidably installed inside the shaft center of the output shaft side gear (12), and the inner end of the sliding rod (38) It faces the end face of the spring receiver (35). A slide bearing (5
0), and the relative speed between the rod and the spring receiver is adjusted by this slide bearing. The other end portion of the sliding rod (38) passing through the output shaft side gear (12) projects into the hollow portion (39) within the output shaft (15). A spline (4
A clutch body (41) is slidably fitted onto the outside via the clutch body (41) and the aforementioned sliding rod (38).
is the pin (4) inserted in the diametrical direction of the output shaft (15).
2) are connected to each other. This bottle (42)
is slidable in the axial direction with respect to the output shaft (15) together with the clutch body (41). A lever shaft (43) is pivotally supported on the lever case (14) in a direction parallel to the diameter direction of the output shaft (15).
The shift fork (44) attached to the inner end of
It engages with the clutch body (41) and has an operating lever (45) attached to its outer end. Furthermore, a clutch pawl (46) is provided at the end of the clutch body (41), and the clutch pawl (46) is provided on the surface of the pump housing lid (11) opposite to this clutch pawl (46).
A clutch pawl (47) that engages with is formed. In addition, the pump housing (10) and the housing lid (1
1) is integrally formed with a protrusion (48) that scoops up the oil in the oil pan (2) and scatters it upwards, and further above the ceiling surface of the hydraulic oil case (1). A guide plate (49) is attached in a more hanging manner. The guide plate (49) has an end facing above the lubricating oil reservoir (30) and a protrusion (49).
The hydraulic oil splashed by the guide plate (4)
9) to the lubricating oil reservoir (30) and falling into the lubricating oil reservoir (30). The other end (right side in the figure) of the guide plate (49) is structured to supply oil to bearings, forks, splines, etc.

In the figure, (50) is a flywheel of the engine, and this flywheel (50) and the outer end of the input shaft (4) are connected by a shaft coupling (51).

In the above configuration, the input shaft (4) is constantly rotated by the flywheel (50).

The pump housing (10) rotates together with the input shaft (4), and the meshing part (18) between the input shaft gear (13) and the output shaft gear (12) inside the housing rotates the pump housing (10). The oil in the pan (2) is sucked up from the suction pipe (7) side, further passes through the meshing part (1), and is discharged to the outlet passage (20) side.

At this time, if the pressure of the spring (36) acting on the throttle valve body (34) is small, the oil in the outlet passage (20) can easily pass through the valve seat hole (23). Therefore, the input gear (13) slightly rotates the output shaft side gear (12) while relatively idling around the output gear (12), so the output shaft (15) rotates at a low speed. .

Also, at this time, the hydraulic oil that has exited the outlet passage (20) is discharged from the through hole (21) side to the lubricating oil reservoir (30) side, and after filling this lubricating oil reservoir (30). ,
It falls to the oil pan (2) side.

From the above state, when the operating lever (45) is rotated to the right in the figure and the clutch body (41) on the output shaft (15) is slid to the left in the figure, the sliding Rod (3
8) moves in the same direction and pushes the spring holder (35), so the spring
(36) increases, thereby reducing the gap between the valve seat hole (23) and the valve body (34), thereby increasing the pressure within the outlet passage (20). Therefore,
Since the pressure inside the valve insertion hole (33) increases, the valve body (
34) moves (toward the right in the figure) until it engages with the force of the spring (36). Therefore, the amount of hydraulic oil leaking from the valve seat hole (23) is reduced. Therefore, the output shaft side gear (
12) increases, and along with this, the output shaft (15)
The rotation speed of the engine also increases.

When the operating lever (45) is fully rotated to the right in the figure, the amount of hydraulic oil leaking to the valve seat hole (23) side is almost completely blocked, and the input shaft (4) side and output shaft It rotates synchronously with the (15) side on an approximately one-to-one basis.

In this state, the clutch pawl (46) provided on the shifter (41) is set to engage with the clutch pawl (47) on the pump housing lid (11), so that the pump housing (40) or Input shaft (4)
side and output shaft (15) side are this clutch pawl (47)
(46) and rotate completely in unison. In this state, hydraulic oil is no longer supplied from the valve seat hole (23) side to the lubricating oil reservoir (30), but the hydraulic oil that had previously accumulated in the lubricating oil reservoir (30) is Since lubricating oil is supplied from the hole (31) to the rotating and sliding portion (29) of the input shaft (4) and the bearing (5), there is no shortage of lubricating oil. Moreover, in this lubricating oil reservoir (30), the guide plate 1= (49)
Since the oil in the oil pan (2) is supplied through the oil pump, there is no risk of insufficient lubrication even if such synchronous operation is carried out for a considerable period of time.

FIG. 2 shows an embodiment in which the throttle valve body (34) is provided on the output shaft (15) side. The hydraulic oil that has exited the meshing part (18) between the output shaft side gear (12) and the gear (13) flows into the output shaft (15) from the outlet passage (20) formed at the center of the output shaft side gear (12). It is designed to be discharged to the passage (53) side in the hydraulic oil case (1). Also,(
53) is structured to be returned to the oil sump (30) shown in FIG. A valve body (34) is inserted into the valve insertion hole (33) formed through the center of the output shaft (15) in the axial direction so as to close the communication between the outlet passage (20) and the passage (53). It is slidably inserted. Similarly, the valve insertion hole (3
3) A spring (36) is interposed between the spring receiver (35) inserted into the valve body (34), and the spring receiver (35) is inserted into the shifter (44) via the bottle (42). is directly connected to.

Regardless of whether the throttle valve (34) is provided on either the input shaft (4) or the output shaft (15), the through hole (21) or valve seat hole (23) on the discharge side of the throttle valve body (34) ) near the rotary joint (for example, the hole (19a) provided in the rotary sliding part (29) and the sealing material (29a) on both sides of the hole (19a)).
), there is no need to provide a structure that corresponds to the structure consisting of Since there is no joint, the total length of the hydrostatic joint type power transmission device becomes shorter and more compact.

Effects of the Invention As described above, according to the present invention, since the throttle valve provided on the discharge side of the gear meshing portion is provided on the rotating part such as the human power shaft or the output shaft, the throttle valve and the gear meshing There is no need to connect the parts with a swivel joint as in the past, there is no oil leakage between them, and the pump capacity is about one-third that of when such a swivel joint is installed. However, it is possible to achieve the effect that the input shaft side and the output shaft side can be rotated synchronously.

Furthermore, in this invention, by guiding the hydraulic oil passing through the gear meshing part to the oil reservoir above the rotating sliding part, even when oil is no longer supplied from the throttle valve side during the synchronous rotation as described above, Since the oil stored in this lubricating oil reservoir can be supplied to the rotating sliding parts, etc., there is an effect that insufficient lubrication will not occur in the synchronous rotation state. Therefore, there is no need to use a special lubricating oil pump as in the past, and
Splashing has better lubrication performance than lubrication alone.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of the entire power transmission device showing an embodiment of the present invention, and FIG. 2 is a longitudinal cross-sectional view of main parts showing another embodiment. (4)...Input shaft, (15)...Output shaft, (18)
... Gear meshing part, (29) ... Rotating sliding part, (30
)... Lubricating oil reservoir, (34)... Throttle valve.

Claims (1)

[Claims] 1. A hydrostatic joint between an input shaft and an output shaft, in which the rotation of the output shaft changes depending on the amount of oil passing through the meshing portion between the input shaft side gear and the output shaft side gear. In a power transmission device equipped with
A throttle valve that changes the amount of oil passing through the meshing part is disposed within the rotating part of either the input shaft or the output shaft, and the throttle valve is driven in the throttle direction or the valve opening direction of the throttle valve. A hydrostatic joint type power transmission device, characterized in that the hydrostatic joint is interlocked and connected to an external operating mechanism that locks up the input shaft and the output shaft while the hydrostatic joint is locked. 2. A hydrostatic joint is installed between the input shaft and the output shaft so that the rotation speed of the input shaft changes depending on the amount of oil passing through the meshing part between the input shaft side gear and the output shaft side gear. In the power transmission device, a lubricating oil reservoir communicating with the rotating and sliding portion is provided above the rotating and sliding portion of the input shaft or the output shaft, and the hydraulic oil passing through the gear meshing portion is directed to this lubricating oil reservoir. A hydrostatic joint type power transmission device characterized by being guided.