JPH023005Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is a foreign object jamming prevention device for a torque converter with a centrifugal lock-up mechanism, which prevents foreign objects from getting caught in the sliding surface of the lock-up mechanism in a torque converter with a lock-up mechanism. It is related to.

(Prior art and its problems) This type of torque converter is equipped with a lock-up mechanism inside the torque converter that operates to press the facing against the sliding surface of the front cover of the torque converter using centrifugal force. Engine power is sometimes transmitted to the subsequent transmission without going through the torque converter to improve fuel efficiency at high speeds.

However, in such conventional examples, foreign objects such as welding spatters may get caught between the facing and the sliding surface, and if the relatively thin and soft facing is damaged by foreign objects, the lock-up mechanism will not function normally. The problem is that it stops working.

(Purpose of the invention) An object of the invention is to provide a foreign object jamming prevention device for a torque converter with a centrifugal lock-up mechanism, which can prevent foreign objects from becoming trapped between the facing and the sliding surface of the lock-up mechanism.

(Structure of the invention) (1) Technical means The present invention is equipped with a lock-up mechanism inside the torque converter that uses centrifugal force to press the facing against the sliding surface formed on the inner surface of the front cover of the torque converter. In a torque converter, a continuous recess is formed along the axial direction on the inner surface of the front cover located radially outward of the facing of the lock-up mechanism, and a substantially annular drum is formed on the inner surface of the front cover at the portion where the recess is formed. A passage is formed between the drum and the front cover through which the hydraulic oil inside the torque converter flows, and the inner peripheral surface of the drum is used as the sliding surface of the facing, and the hydraulic oil flowing through the passage forms a passage. A device for preventing foreign matter from getting caught in a torque converter with a centrifugal lockup mechanism is characterized in that foreign matter that gets caught in the sliding surface is washed away.

(2) Function The hydraulic oil flowing through the passage washes away foreign matter and prevents foreign matter from getting caught between the facing and the sliding surface.

(Embodiment) A torque converter with a lockup to which the present invention is applied will be described with reference to FIG.

In FIG. 1, 10 is a cylinder shaft connected to the crankshaft, and a front cover 1 is attached to the rear end of the cylinder shaft 10.
2 is fixed by welding. Front cover 12
Behind the pump shell 1 of the pump impeller 14
5a is continuously fixed at a welded portion 15e.
The pump impeller 14 includes a pump shell 15a, a pump blade 15b, a pump core ring 15c, and a hub 15d, and is configured to transmit engine power to the pump blade 15b through the front cover 12 and the pump shell 15a.

A turbine impeller 16 is provided to face the pump impeller 14.
are the turbine shell 17a and the turbine blade 17
b, a turbine core ring 17c, and a hub 17d. The hub 17d is spline-fitted to a turbine shaft (not shown). This turbine shaft is a hollow shaft, and the turbine shaft is connected to a rear-stage transmission.

A stator impeller 20 is provided between the pump impeller 14 and the turbine impeller 16. The stator impeller 20 is formed from a stator boss portion 21a, stator blades 21b, and the like. An outer race 21c is provided inside the stator boss portion 21a, and a roller 21d and an inner race 21e are further provided inside the outer race 21c. The inner race 21e is spline-fitted to the outer periphery of a stator shaft (not shown) that is fitted to the outer periphery of the turbine shaft with a predetermined gap therebetween. A one-way clutch 23 is formed by these outer race 21c, roller 21d, and inner race 21e, and retainers 21f and 21i are provided on both sides of the one-way clutch 23.

A lockup damper 30 (lockup mechanism) is provided between the turbine impeller 16 and the front cover 12. Rock up damper 3
0 is formed from a clutch plate 32, a retainer plate 34, a torsion spring 36, a reaction plate 38, a facing 40, and the like. The clutch plate 32 is riveted to the hub 33a, and the hub 33a and the hub 17d are connected together.
A one-way clutch 33b is interposed between them.

The reaction plate 38 has a substantially annular shape as shown in FIG. 2, and shoes 42 are fitted to the outer periphery of the reaction plate 38 at equal intervals in the circumferential direction so as to be able to expand and contract in the radial direction. are doing. The shoe 42 has a weight 43 and a leaf spring (not shown), and is biased in the diameter reduction direction by the leaf spring. The facing 4 is provided on the outer peripheral surface of the shoe 42.
0 is attached, and the facing 40 is made of a thin and relatively soft friction material.

A plurality of recesses 44 are formed at equal intervals in the circumferential direction on the inner surface of the front cover 12 located radially outward of the facing 40. An annular drum 46 is press-fitted tightly into the inner surface of the front cover 12 so as to cover the recess 44.
Further, the drum 46 is welded to the front cover 12. A passage 48 is formed between the outer peripheral surface of the drum 46 and the recess 44. The inner peripheral surface of the drum 46 forms a sliding surface 50 against which the facing 40 is pressed.

The inside of the torque converter described above is filled with hydraulic oil f supplied from an oil pan (not shown), and this hydraulic oil f is supplied from an oil pump (not shown).
It is being pumped by.

Next, the effect will be explained. When the rotation of the engine is transmitted to the front cover 12 and the pump impeller 14 rotates together with the front cover 12, hydraulic oil f flows in the direction of arrow A from the gap 52 between the retainer 21f and the boss portion 15d. A part of the hydraulic oil f that is pumped toward the turbine blade 17b by the pump plate 15b flows toward the lock-up damper 30 along the direction of arrow B. At this time, if the hydraulic fluid f flowing inside the torque converter is contaminated with welding spatters (foreign objects) that have entered the torque converter during welding work on the welding section 54, the conventional structure However, due to the centrifugal force caused by the rotation of the front cover 12, welding spatters are concentrated on the outer periphery, that is, near the inner periphery of the front cover 12, and the operation It flows forward of the reaction plate 38 through the passage 48 together with the flow of oil f.

Therefore, the welding spatter does not get caught between the facing 40 and the sliding surface 50, but instead flows along the arrow C through the passage 48 formed on the radially outer circumference of the hydraulic oil passage inside the torque converter. Eventually, the flow of hydraulic oil f shown by arrow C passes through the interior of the hollow turbine shaft from the gap 56 along arrow D, returns to the oil pan (not shown), and is filtered through an oil filter (not shown). be captured.

(Effects of the invention) As explained above, the foreign object jamming prevention device for a torque converter with a centrifugal lock-up mechanism according to the invention uses a sliding member formed on the inner surface of the front cover of the torque converter that uses centrifugal force to move the facing inside the torque converter. In a torque converter with a lock-up mechanism that has a lock-up mechanism that is pressed against a surface, a concave portion that is continuous along the axial direction is formed on the inner surface of the front cover located radially outward of the facing of the lock-up mechanism, and this concave portion is formed. A substantially annular drum is fixedly attached to the inner surface of the front cover in the area where the front cover is located, and a passage is formed between the drum and the front cover for circulating the hydraulic oil inside the torque converter, and the inner peripheral surface of the drum is connected to the sliding surface of the facing. Since the flow of hydraulic oil flowing through the passage washes away foreign matter caught in the sliding surface, the following effects are achieved.

Even if the hydraulic fluid f is contaminated with welding spatter (foreign matter) that has entered the torque converter during welding work on the welding section 54, for example, the centrifugal force caused by the rotation of the front cover 12 will cause the welding spatter to be removed from the outer periphery, that is, at the front. The reaction plate 38 is concentrated near the inner circumferential surface of the cover 12 and passes along with the flow of the hydraulic oil f through a passage 48 formed on the radially outer circumference of the hydraulic oil passage inside the torque converter.
As a result, the welding spatter can be prevented from being caught between the facing 40 and the sliding surface 50 as in the conventional case.

Therefore, damage to the facing 40 due to welding spatters being caught is prevented, and malfunction of the lock-up damper 30 can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a partial vertical cross-sectional view of a torque converter to which the present invention is applied, and FIG. 2 is a partial partial cross-sectional view of FIG. 1. 12... Front cover, 14... Pump impeller, 16... Turbine impeller, 20... Stator impeller, 30... Lock-up damper, 40...
... facing, 44 ... recess, 46 ... drum, 48 ... passage.

Claims (1)

[Scope of utility model registration request] In a torque converter with a lock-up mechanism, which is equipped with a lock-up mechanism inside the torque converter that uses centrifugal force to press the facing against the sliding surface formed on the inner surface of the front cover of the torque converter, the lock-up mechanism is located radially outward of the facing of the lock-up mechanism. A continuous recess is formed along the axial direction on the inner surface of the front cover, and a substantially annular drum is fixedly attached to the inner surface of the front cover in the area where the recess is formed, and the inside of the torque converter is provided between the drum and the front cover. A passage is formed through which hydraulic oil flows, the inner circumferential surface of the drum is used as the sliding surface of the facing, and foreign matter caught in the sliding surface is washed away by the flow of the hydraulic oil flowing through the passage. Features a device to prevent foreign objects from getting caught in torque converters with a centrifugal lock-up mechanism.